1,014 community and non-transient non-community water systems are listed for Maryland in EPA SDWIS. 83 were sampled under UCMR 5; 30 of those had at least one PFAS result at or above the reporting level, and 16 had a highest single result at or above a 2024 EPA limit (PFOA or PFOS 4 ppt, or Hazard Index 1).
Maryland map · Download: systems (CSV) · all results (CSV, gzip)
These are monitoring results collected under EPA's Fifth Unregulated Contaminant Monitoring Rule (UCMR 5) at entry points, where treated water enters the distribution system; they are not tap-water samples. They are not compliance determinations: compliance with EPA's 2024 PFAS limits is judged on running annual averages of compliance monitoring, required from 2029, so a single UCMR 5 result at or above a limit is not a violation. “< MRL” means the compound was not quantified at EPA's minimum reporting level; it does not mean zero.
Sampled under UCMR 5 (83)
| System | PWSID | City | Population | Highest PFOA (ppt) | Highest PFOS (ppt) | Highest HI | Highest single result |
|---|---|---|---|---|---|---|---|
| Boonsboro - Keedysville | MD0210002 | Boonsboro | 4,250 | 6.7 | <MRL | 0.314 | PFOA 1–3 × its limit |
| Broad Creek | MD0020004 | Millersville | 26,033 | <MRL | <MRL | 0 | No PFAS detected |
| Bryans Road | MD0080033 | La Plata | 6,260 | <MRL | <MRL | 0 | No PFAS detected |
| Chapel Hill - Aberdeen Proving Grounds | MD0120002 | Aberdeen | 15,000 | <MRL | <MRL | 0 | No PFAS detected |
| Charlotte Hall Va Home | MD0180217 | Millersville | 270 | <MRL | <MRL | 0 | No PFAS detected |
| Chesapeake Complex | MD1020003 | Pasadena | 4,785 | <MRL | <MRL | 0 | No PFAS detected |
| Chesapeake Ranch Estates | MD0040004 | Lusby | 9,500 | <MRL | <MRL | 0 | No PFAS detected |
| City Of Aberdeen | MD0120001 | Aberdeen | 18,006 | 7.6 | 8.6 | 0.582 | PFOS 1–3 × its limit |
| City Of Annapolis | MD0020001 | Annapolis | 35,000 | <MRL | <MRL | 0 | No PFAS detected |
| City Of Baltimore | MD0300002 | Baltimore | 1,600,000 | <MRL | <MRL | 0 | Other PFAS detected |
| City Of Bowie | MD0160002 | Bowie | 25,000 | <MRL | <MRL | 0 | No PFAS detected |
| City Of Brunswick | MD0100005 | Brunswick | 7,312 | <MRL | <MRL | 0 | No PFAS detected |
| City Of Cambridge Water | MD0090002 | Cambridge | 15,000 | <MRL | <MRL | 0 | No PFAS detected |
| City Of Cumberland | MD0010008 | Cumberland | 27,039 | <MRL | <MRL | 0 | No PFAS detected |
| City Of Frederick | MD0100015 | Frederick | 54,000 | <MRL | <MRL | 0 | Other PFAS detected |
| City Of Frostburg | MD0010011 | Frostburg | 11,000 | <MRL | <MRL | 0 | No PFAS detected |
| City Of Fruitland | MD0220008 | Fruitland | 5,907 | <MRL | 4.1 | 0.4 | PFOS 1–3 × its limit |
| City Of Hagerstown | MD0210010 | Hagerstown | 92,200 | <MRL | <MRL | 0 | No PFAS detected |
| City Of Havre De Grace | MD0120012 | Havre De Grace | 14,000 | <MRL | <MRL | 0 | No PFAS detected |
| City Of Pocomoke City | MD0230006 | 4,100 | <MRL | <MRL | 0 | No PFAS detected | |
| City Of Rockville | MD0150003 | 52,000 | <MRL | <MRL | 0.002 | Hazard Index below its limit | |
| City Of Salisbury | MD0220004 | Salisbury | 30,343 | 5.9 | 20 | 0.622 | PFOS ≥ 3 × its limit |
| City Of Taneytown | MD0060012 | Taneytown | 6,750 | 4.6 | 10.7 | 0.433 | PFOS 1–3 × its limit |
| City Of Westminster | MD0060015 | Westminster | 35,256 | 12.4 | 6.9 | 0.422 | PFOA ≥ 3 × its limit |
| Crofton-Odenton | MD0020008 | Millersville | 62,986 | <MRL | <MRL | 0 | No PFAS detected |
| Eastern Correctional Institute | MD0190013 | Millersville | 3,500 | <MRL | <MRL | 0 | No PFAS detected |
| Eastern Region Allegany Distrib. System | MD0010005 | Cumberland | 5,703 | <MRL | <MRL | 0 | No PFAS detected |
| Easton Utilities | MD0200003 | Easton | 17,357 | <MRL | <MRL | 0 | No PFAS detected |
| Elkton West | MD0070015 | Newark | 3,500 | <MRL | <MRL | 0 | No PFAS detected |
| Fort Detrick | MD0100011 | Frederick | 7,900 | <MRL | <MRL | 0 | Other PFAS detected |
| Fort George G. Meade | MD0020012 | Fort Meade | 62,234 | <MRL | <MRL | 0 | No PFAS detected |
| Freedom District | MD0060002 | Westminster | 24,867 | <MRL | <MRL | 0 | Other PFAS detected |
| Glen Burnie-Broadneck | MD0020017 | Millersville | 290,606 | <MRL | <MRL | 0 | No PFAS detected |
| Glenelg Country School | MD1130003 | Ellicott City | 950 | 10 | <MRL | 0.653 | PFOA 1–3 × its limit |
| Harford County D.P.W. | MD0120016 | Abingdon | 104,567 | <MRL | <MRL | 0 | No PFAS detected |
| Howard County D.P.W. Distribution | MD0130002 | Columbia | 286,158 | <MRL | <MRL | 0 | Other PFAS detected |
| Lavale Sanitary Commission | MD0010016 | Lavale | 5,500 | <MRL | <MRL | 0 | No PFAS detected |
| Lexington Park | MD0180007 | California | 43,030 | <MRL | <MRL | 0 | No PFAS detected |
| Manor Shopping Center | MD1030054 | Phoenix | 2,921 | <MRL | <MRL | 0 | Other PFAS detected |
| Maryland American Water Company | MD0120003 | Bel Air | 13,200 | 9.3 | 9.1 | 0.342 | PFOA 1–3 × its limit |
| Maryland American Water--Severn System | MD0020027 | Bel Air | 5,447 | <MRL | <MRL | 0 | No PFAS detected |
| Md American Water Provinces | MD0020029 | Belair | 3,886 | <MRL | <MRL | 0 | No PFAS detected |
| Mgm National Harbor | MD1160049 | 24,000 | <MRL | <MRL | 0 | Other PFAS detected | |
| Midland-Lonaconing | MD0010018 | Lonaconing | 5,000 | <MRL | <MRL | 0 | No PFAS detected |
| Mystic Harbour | MD0230011 | Berlin | 5,945 | <MRL | <MRL | 0 | No PFAS detected |
| Naval Support Facility, Indian Head | MD0080058 | Indian Head | 3,321 | <MRL | <MRL | 0 | No PFAS detected |
| New Design - Frederick County | MD0100030 | Frederick | 74,911 | <MRL | <MRL | 0 | Other PFAS detected |
| New Life Christian School | MD1100052 | Frederick | 200 | 10.1 | 15.3 | 0.007 | PFOS ≥ 3 × its limit |
| Oakville Elementary School | MD1180037 | Loveville | 475 | <MRL | <MRL | 0 | No PFAS detected |
| Ocean Pines | MD0230005 | Berlin | 11,890 | <MRL | <MRL | 0.002 | Hazard Index below its limit |
| Patuxent Naval Air Station (Navfac-Wash) | MD0180022 | Patuxent River | 22,000 | <MRL | <MRL | 0 | No PFAS detected |
| Penn-Mar Organization, Inc. | MD1030058 | Freeland | 122 | <MRL | <MRL | 0 | No PFAS detected |
| Piney Point | MD0180034 | California | 672 | <MRL | <MRL | 0 | No PFAS detected |
| Prince Frederick | MD0040011 | Prince Frederick | 4,371 | <MRL | <MRL | 0 | No PFAS detected |
| Solomons | MD0040027 | Prince Frederick | 3,811 | <MRL | <MRL | 0 | No PFAS detected |
| Stevensville | MD0170019 | Stevensville | 9,155 | <MRL | <MRL | 0 | No PFAS detected |
| Town Of Berlin | MD0230001 | Berlin | 4,500 | <MRL | <MRL | 0.49 | Hazard Index below its limit |
| Town Of Centreville | MD0170001 | Centreville | 3,322 | <MRL | <MRL | 0 | No PFAS detected |
| Town Of Chesapeake Beach | MD0040003 | Chesapeake Beach | 5,000 | <MRL | <MRL | 0 | No PFAS detected |
| Town Of Chestertown | MD0140002 | Chestertown | 5,400 | <MRL | <MRL | 0 | No PFAS detected |
| Town Of Delmar | MD0220001 | Delmar | 4,500 | <MRL | <MRL | 0 | No PFAS detected |
| Town Of Denton | MD0050001 | Denton | 4,848 | <MRL | <MRL | 0 | No PFAS detected |
| Town Of Elkton | MD0070011 | Elkton | 15,625 | 23.3 | 7.1 | 0.443 | PFOA ≥ 3 × its limit |
| Town Of Hampstead | MD0060003 | Hampstead | 6,600 | 9.1 | 5.7 | 0.343 | PFOA 1–3 × its limit |
| Town Of Hancock | MD0210012 | Hancock | 1,921 | <MRL | <MRL | 0 | No PFAS detected |
| Town Of Indian Head | MD0080020 | Indian Head | 4,100 | <MRL | <MRL | 0 | No PFAS detected |
| Town Of La Plata | MD0080025 | La Plata | 11,535 | <MRL | <MRL | 0 | No PFAS detected |
| Town Of Manchester | MD0060006 | Manchester | 4,954 | 4.7 | <MRL | 0.315 | PFOA 1–3 × its limit |
| Town Of Middletown | MD0100018 | Middletown | 5,132 | 4.9 | 6.7 | 0.353 | PFOS 1–3 × its limit |
| Town Of Millington | MD0140010 | Millington | 630 | <MRL | <MRL | 0 | No PFAS detected |
| Town Of Mount Airy | MD0060007 | Mount Airy | 9,890 | 12.7 | 6 | 0.003 | PFOA ≥ 3 × its limit |
| Town Of North East | MD0070016 | North East | 8,600 | <MRL | <MRL | 0 | Other PFAS detected |
| Town Of Ocean City | MD0230003 | Ocean City | 30,000 | <MRL | <MRL | 0 | No PFAS detected |
| Town Of Perryville | MD0070018 | Perryville | 4,413 | <MRL | <MRL | 0 | No PFAS detected |
| Town Of Poolesville | MD0150002 | Poolesville | 6,005 | 5.4 | 6.5 | 0.69 | PFOS 1–3 × its limit |
| Town Of Princess Anne | MD0190002 | Princess Anne | 3,300 | <MRL | <MRL | 0 | No PFAS detected |
| Town Of Thurmont | MD0100023 | Thurmont | 6,200 | 15 | 48 | 0.532 | PFOS ≥ 3 × its limit |
| Town Of Walkersville | MD0100025 | Walkersville | 8,440 | <MRL | <MRL | 0 | No PFAS detected |
| U.S. Naval Academy | MD0020042 | Annapolis | 8,700 | <MRL | <MRL | 0 | No PFAS detected |
| Waldorf - Charles County Dpw | MD0080049 | La Plata | 84,296 | <MRL | <MRL | 0.002 | Hazard Index below its limit |
| Washington Suburban Sanitary Commission | MD0150005 | Laurel | 1,900,000 | <MRL | <MRL | 0 | Other PFAS detected |
| Western Region Allegany Distrib. System | MD0010009 | Cumberland | 4,955 | <MRL | <MRL | 0 | No PFAS detected |
| White Plains 2 Mhp/Jack Blair | MD0080208 | Jessup | 70 | <MRL | <MRL | 0 | No PFAS detected |
Not tested under UCMR 5 (931)
UCMR 5 required monitoring by systems serving 3,300 or more people and by a representative sample of smaller systems. The systems below have no UCMR 5 results in EPA's data. Not tested is not the same as not detected: the absence of results says nothing about PFAS in their water.
| System | PWSID | Type | City | Population | Counties |
|---|---|---|---|---|---|
| 2002 Bethel Road (Aka Telemecanique) | MD1060073 | NTNCWS | Westminster | 41 | Carroll County |
| 258 Najoles Road | MD1020152 | NTNCWS | Baltimore | 84 | Anne Arundel County |
| 31550 Winterplace Park | MD1220045 | NTNCWS | Salisbury | 97 | Wicomico County |
| 31850 Millington Road | MD1140012 | NTNCWS | Millington | 45 | Kent County |
| A.I.M. Corporation | MD1030001 | NTNCWS | Parkton | 80 | Baltimore County |
| Abc Child Development Center | MD1060063 | NTNCWS | Westminster | 51 | Carroll County |
| Adventist Healthcare Shady Grove Med Ctr | MD1150054 | NTNCWS | Rockville | 2,100 | Montgomery County |
| Amelano Manor | MD0100001 | CWS | Frederick | 36 | Frederick County |
| Angelica Nurseries - Nursery View | MD0140011 | CWS | Kennedyville | 38 | Kent County |
| Angelica Nurseries, Inc. | MD1140010 | NTNCWS | Kennedyville | 250 | Kent County |
| Annapolis Area Christian School | MD1020135 | NTNCWS | Severn | 510 | Anne Arundel County |
| Appeal Elementary School | MD1040001 | NTNCWS | Prince Frederick | 569 | Calvert County |
| Apple Signs | MD1021659 | NTNCWS | Millersville | 27 | Anne Arundel County |
| Aqualand Campground | MD1081005 | CWS | Newburg | 240 | Charles County |
| Assateague Island National Seashore - Hq | MD1230059 | NTNCWS | 55 | Worcester County | |
| Atlantic General (Prev Gina Renee Plaza) | MD1230081 | NTNCWS | Berlin | 30 | Worcester County |
| Autumn Lake Healthcare | MD0070206 | CWS | Rising Sun | 290 | Cecil County |
| Autumn Lake Healthcare Ruxton | MD1030099 | NTNCWS | Naperville | 345 | Baltimore County |
| Ava Wanas Montessori School | MD1060046 | NTNCWS | Sykesville | 45 | Carroll County |
| Avon Crest | MD0080002 | CWS | La Plata | 79 | Charles County |
| Azar Eye Institute | MD1221138 | NTNCWS | Salisbury | 75 | Wicomico County |
| B&L Mobile Home Park | MD0040209 | CWS | Huntingtown | 65 | Calvert County |
| B.T.R. Hampstead (Black And Decker) | MD1060004 | NTNCWS | Towson | 472 | Carroll County |
| Backbone Mountain Boys Camp | MD0110204 | CWS | Millersville | 60 | Garrett County |
| Baden Elementary | MD1160004 | NTNCWS | Upper Marlboro | 300 | Prince George's County |
| Bainbridge Elementary | MD1070001 | NTNCWS | Elkton | 413 | Cecil County |
| Bais Yaakov School For Girls | MD1030002 | NTNCWS | Baltimore | 940 | Baltimore County |
| Baldwin Memorial U.M. Church, Day Care | MD1020061 | NTNCWS | Millersville | 160 | Anne Arundel County |
| Bali Hi Rv Park | MD1231220 | NTNCWS | Bishopville | 188 | Worcester County |
| Baltimore County Agricultural Center | MD1030098 | NTNCWS | Baltimore | 38 | Baltimore County |
| Baltimore County Animal Services | MD1031006 | NTNCWS | Baldwin | 25 | Baltimore County |
| Banks Odee | MD0080003 | CWS | Private | 65 | Charles County |
| Bar T Mountainside | MD1101336 | NTNCWS | Urbana | 450 | Frederick County |
| Bark Hill Bible Church | MD0060019 | CWS | Westminster | 163 | Carroll County |
| Barrelville | MD0010001 | CWS | Mt. Savage | 130 | Allegany County |
| Bay Country Estates Mobile Home Park | MD0070207 | CWS | Rising Sun | 276 | Cecil County |
| Bay Country Mobile Home Park | MD0090219 | CWS | Durham | 300 | Dorchester County |
| Bay Montessori School | MD1180070 | NTNCWS | Lexington Park | 100 | St. Mary's County |
| Bayside Community Network | MD1071244 | NTNCWS | Elkton | 113 | Cecil County |
| Bayside Village | MD1231051 | CWS | Salisbury | 50 | Worcester County |
| Bayside-Queenslanding | MD0170007 | CWS | Stevensville | 1,030 | Queen Anne's County |
| Bayview At Kent Narrows | MD0170013 | CWS | Grasonville | 75 | Queen Anne's County |
| Bb Apartments (Prev Woc Village Apts) | MD0230023 | CWS | Ocean City | 40 | Worcester County |
| Beach Harbor | MD1170001 | CWS | Grasonville | 481 | Queen Anne's County |
| Beaches Water Co-Operative | MD0040009 | CWS | St. Leonard | 2,000 | Calvert County |
| Beantown Park- Woodley Road | MD0080004 | CWS | La Plata | 127 | Charles County |
| Beaver Run Mobile Home Park | MD0090222 | CWS | Sacramento | 275 | Dorchester County |
| Beckleys Camping Center | MD1101011 | NTNCWS | Thurmont | 45 | Frederick County |
| Bel Alton | MD0080005 | CWS | La Plata | 311 | Charles County |
| Bellewood Water Association | MD0080006 | CWS | Waldorf | 75 | Charles County |
| Belmont Carriage House Conservancy Bldg | MD1131102 | NTNCWS | Woodstock | 33 | Howard County |
| Benedict | MD0080062 | CWS | La Plata | 376 | Charles County |
| Benedictine School | MD0050201 | CWS | Ridgely | 300 | Caroline County |
| Benfield Corporate Park Llc | MD1020147 | NTNCWS | Baltimore | 75 | Anne Arundel County |
| Benjamin Banneker Early Childhood Center | MD1180031 | NTNCWS | Loveville | 100 | St. Mary's County |
| Benjamin Banneker Elementary School | MD1180001 | NTNCWS | Loveville | 600 | St. Mary's County |
| Benjamins Village/Homestead M.H.P. | MD0070209 | CWS | Port Deposit | 400 | Cecil County |
| Bennett Mobile Home Park | MD0220222 | CWS | Delmar | 60 | Wicomico County |
| Best Rental Housing, Inc. | MD0220012 | CWS | Ocean Pines | 68 | Wicomico County |
| Bethel Day Care And School | MD1120055 | NTNCWS | Havre De Grace | 40 | Harford County |
| Birch Manor | MD0180015 | CWS | California | 272 | St. Mary's County |
| Blackstone Marina | MD1181016 | NTNCWS | Hollywood | 80 | St. Mary's County |
| Bloch & Guggenheimer Co. | MD1090001 | NTNCWS | Hurlock | 250 | Dorchester County |
| Bloomington | MD0110002 | CWS | Oakland | 350 | Garrett County |
| Boh-Nak Mobile Home Park | MD0220218 | CWS | Fruitland | 85 | Wicomico County |
| Bon Secour Spiritual Center | MD1130022 | NTNCWS | Marriottsville | 50 | Howard County |
| Bonnie Brook | MD0090001 | CWS | Cambridge | 390 | Dorchester County |
| Boones Mobile Estates | MD0020231 | CWS | Lothian | 1,315 | Anne Arundel County |
| Bradford Estates | MD0100032 | CWS | Frederick | 178 | Frederick County |
| Braemar Condos Distribution | MD1231274 | NTNCWS | Ocean City | 170 | Worcester County |
| Breit - 4840/4844 Winchester Boulevard | MD1101341 | NTNCWS | Lutherville | 61 | Frederick County |
| Breton Bay | MD0180001 | CWS | California | 1,012 | St. Mary's County |
| Bretton Woods Recreation Center | MD1150003 | NTNCWS | Germantown | 100 | Montgomery County |
| Briddletown Distribution System | MD0230015 | CWS | Berlin | 150 | Worcester County |
| Bridge Pointe-Kent Island Village | MD0170017 | CWS | Stevensville | 600 | Queen Anne's County |
| Bridges Montessori School | MD1121240 | NTNCWS | Bel Air | 35 | Harford County |
| Brightview Business Center | MD1020123 | NTNCWS | Severna Park | 70 | Anne Arundel County |
| Brook Lane Health Services | MD0210004 | CWS | 175 | Washington County | |
| Brooke Grove Retirement Village | MD1150053 | NTNCWS | 390 | Montgomery County | |
| Brooks Administration Building | MD1040006 | NTNCWS | Prince Frederick | 106 | Calvert County |
| Brophytown Distribution System | MD0010038 | CWS | Cumberland | 47 | Allegany County |
| Buckeystown Veterinary Hospital | MD1100071 | NTNCWS | Buckeystown | 34 | Frederick County |
| Burdette Brothers Used Cars | MD1100048 | NTNCWS | Clarksburg | 25 | Frederick County |
| Bushy Park Es/Glenwood Ms Complex | MD1130001 | NTNCWS | Ellicott City | 1,500 | Howard County |
| Butler School | MD1150038 | NTNCWS | 169 | Montgomery County | |
| C.S.A.A.C. - Brookeville School Campus | MD1150049 | NTNCWS | Gaithersburg | 60 | Montgomery County |
| Calhoon M.E.B.A. School | MD1200015 | NTNCWS | Easton | 150 | Talbot County |
| Calvert Beach - Decatur Street | MD0040024 | CWS | Waldorf | 350 | Calvert County |
| Calvert Beach / Forest Trail | MD0040020 | CWS | Waldorf | 100 | Calvert County |
| Calvert Cliffs Nuclear - Office Building | MD1040055 | NTNCWS | Lusby | 362 | Calvert County |
| Calvert Cliffs Nuclear - Protected Area | MD1040002 | NTNCWS | Lusby | 482 | Calvert County |
| Calvert Co. Industrial Park | MD1040051 | NTNCWS | Prince Frederick | 158 | Calvert County |
| Calvert Country & Calvert Elementary | MD1040012 | NTNCWS | Prince Frederick | 900 | Calvert County |
| Calvert Elementary | MD1070005 | NTNCWS | Elkton | 389 | Cecil County |
| Calvert Gateway & Mcdonalds # 16243 | MD1040079 | NTNCWS | Crofton | 25 | Calvert County |
| Calvert Manor | MD0160004 | CWS | Accokeek | 300 | Prince George's County |
| Calvert Middle School | MD1040018 | NTNCWS | Prince Frederick | 675 | Calvert County |
| Calvert Mobile Home Park | MD0040206 | CWS | Stuart | 80 | Calvert County |
| Cambridge Farms | MD0100033 | CWS | Frederick | 953 | Frederick County |
| Camp Fretterd Military Reservation | MD1030055 | NTNCWS | Reisterstown | 325 | Baltimore County |
| Campus Hills Water Works | MD0120007 | CWS | Baltimore | 250 | Harford County |
| Cardinal Hickey Academy | MD1041184 | NTNCWS | Owings | 380 | Calvert County |
| Caroline Acres Mobile Home Park | MD0050204 | CWS | 395 | Caroline County | |
| Carpenters Point Water Co. | MD0070003 | CWS | Newark | 400 | Cecil County |
| Carrie Weedon Early Education Center | MD1020087 | NTNCWS | Pasadena | 97 | Anne Arundel County |
| Carroll Lutheran School | MD1060079 | NTNCWS | Westminster | 94 | Carroll County |
| Carroll Manor Elementary School | MD1030005 | NTNCWS | Baltimore | 370 | Baltimore County |
| Carroll Victoria Lodge - Huntingtown | MD1040071 | NTNCWS | Hughesville | 87 | Calvert County |
| Carter'S Webb Learning Center | MD1040080 | NTNCWS | Huntingtown | 54 | Calvert County |
| Cathcart Rail (Appalachian Tank Car Ser) | MD1070049 | NTNCWS | Elk Mills | 28 | Cecil County |
| Cavalier Country | MD0040002 | CWS | Prince Frederick | 381 | Calvert County |
| Caves Valley Golf Club | MD1030065 | NTNCWS | Owings Mills | 75 | Baltimore County |
| Cdj Distillery Llc | MD1060022 | NTNCWS | 65 | Carroll County | |
| Cecil County Central Landfill | MD1070066 | NTNCWS | Perryville | 50 | Cecil County |
| Cecil Woods M.H.P. Distribution System | MD0070252 | CWS | Springfield | 320 | Cecil County |
| Cecil Woods Mobile Home Park Wtp | MD0070244 | CWS | Newark | 285 | Cecil County |
| Cecilton Manor Mobile Home Park | MD0070236 | CWS | North East | 60 | Cecil County |
| Cedar Cove | MD0180002 | CWS | California | 2,728 | St. Mary's County |
| Cedar Mobile Home Park | MD0050205 | CWS | Columbia | 300 | Caroline County |
| Cedar Ridge Children'S Home & School | MD0210020 | CWS | Williamsport | 45 | Washington County |
| Cedarhurst Mobile Home Park | MD0220216 | CWS | Salisbury | 220 | Wicomico County |
| Cedarville Mobile Home Park | MD0160207 | CWS | Brandywine | 780 | Prince George's County |
| Central Precision | MD1210020 | NTNCWS | Boonsboro | 55 | Washington County |
| Chapel District Elementary | MD1200010 | NTNCWS | Easton | 440 | Talbot County |
| Chapel Hill Nursing Center | MD0030202 | CWS | Randalstown | 125 | Baltimore County |
| Chapel Point Wds/ Jude House/ Comm Ctr | MD0080064 | CWS | La Plata | 280 | Charles County |
| Charles County Gardens Water | MD0080008 | CWS | Waldorf | 551 | Charles County |
| Charles J. Miller, Llc | MD1060011 | NTNCWS | 36 | Carroll County | |
| Charlotte Hall | MD1180005 | CWS | California | 615 | St. Mary's County |
| Cheltenham Boys Village | MD0160003 | CWS | Millersville | 330 | Prince George's County |
| Cherry Glade Mennonite Church | MD1110029 | NTNCWS | Accident | 134 | Garrett County |
| Cherry Hill Assisted Living | MD1110025 | NTNCWS | Accident | 39 | Garrett County |
| Chesapeake Bay Foundation | MD1020130 | NTNCWS | Annapolis | 90 | Anne Arundel County |
| Chesapeake Care Res., David Lokey Ctr. | MD1071367 | NTNCWS | Elkton | 42 | Cecil County |
| Chesapeake Christian Fellowship | MD1021698 | NTNCWS | Davidsonville | 625 | Anne Arundel County |
| Chesapeake College | MD1170030 | NTNCWS | Wye Mills | 1,001 | Queen Anne's County |
| Chesapeake Estates Mobile Home Park | MD0070211 | CWS | Berwyn | 159 | Cecil County |
| Chesapeake Heights (Bayside Forest) | MD0040018 | CWS | Prince Frederick | 1,190 | Calvert County |
| Chestnut Point Estates Distribution Sys. | MD0070251 | CWS | Perryville | 32 | Cecil County |
| Chestnut Point Estates Wtp | MD0070240 | CWS | Newark | 82 | Cecil County |
| Child Care Academy Of Windsor | MD1030045 | NTNCWS | Baltimore | 50 | Baltimore County |
| Childrens Center For Discovery | MD1100044 | NTNCWS | Frederick | 50 | Frederick County |
| Childrens Center Of Monrovia | MD1100072 | NTNCWS | Laurel | 90 | Frederick County, Howard County |
| Childtime Of Churchville/Aberdeen | MD1120059 | NTNCWS | Bel Air | 115 | Harford County |
| Chopticon High School | MD1180006 | NTNCWS | Loveville | 1,845 | St. Mary's County |
| Christian Child Care Center Of Whiteford | MD1120052 | NTNCWS | Whiteford | 200 | Harford County |
| Christian Community Child Care Center | MD1220051 | NTNCWS | Salisbury | 45 | Wicomico County |
| Christmas Tree Farm Trailer Park | MD0180206 | CWS | Leonardtown | 100 | St. Mary's County |
| Christophers Fine Foods | MD1020143 | NTNCWS | Tracys Landing | 50 | Anne Arundel County |
| Church Hill Condo, Inc. (The Pond) | MD0170022 | CWS | Church Hill | 25 | Queen Anne's County |
| Church Hill Elementary School | MD1170002 | NTNCWS | Centreville | 280 | Queen Anne's County |
| Churchville Elementary School | MD1120005 | NTNCWS | Bel Air | 441 | Harford County |
| Churchville Presby.Church & Day Care | MD1120004 | NTNCWS | Churchville | 110 | Harford County |
| Cinnamon Woods | MD0070246 | CWS | 60 | Cecil County | |
| Circle Of Care Early Learners | MD1071369 | NTNCWS | Elkton | 40 | Cecil County |
| City Of Crisfield | MD0190001 | CWS | Chrisfield | 2,976 | Somerset County |
| Claiborne | MD0200002 | CWS | Claiborne | 60 | Talbot County |
| Clear View Mobile Home Park Llc | MD0120204 | CWS | Darlington | 28 | Harford County |
| Cliffton On The Potomac | MD0080009 | CWS | La Plata | 744 | Charles County |
| Cloverhill 3 - Consecutive To Md0100015 | MD0100031 | CWS | Frederick | 888 | Frederick County |
| Coll. Of So. Md Trades & Energy Training | MD1080043 | NTNCWS | 402 | Charles County | |
| College Of So. Md Health Sciences Center | MD1080044 | NTNCWS | 175 | Charles County | |
| College Of Southern Md - Main Campus | MD1080038 | NTNCWS | 1,220 | Charles County | |
| Colonel Richardson Mid & High School | MD1050002 | NTNCWS | Denton | 1,022 | Caroline County |
| Colonial Mill Estates Mobile Home Park | MD0220223 | CWS | Freeland | 86 | Wicomico County |
| Columbia Towers | MD0150103 | CWS | Alexandria | 97 | Montgomery County |
| Complete Recyling | MD1070070 | NTNCWS | Elkton | 50 | Cecil County |
| Concord Estates Mobile Home Park | MD0100203 | CWS | Hagerstown | 150 | Frederick County |
| Concourse Commercial Condo, Inc. | MD1020106 | NTNCWS | Potomac | 100 | Anne Arundel County |
| Congoleum Corp. / Cedarhurst Plant | MD1060014 | NTNCWS | Trainer | 56 | Carroll County |
| Congregation Kol Shalom Annapolis | MD1021635 | NTNCWS | Annapolis | 74 | Anne Arundel County |
| Conowingo Elementary | MD1070011 | NTNCWS | Elkton | 874 | Cecil County |
| Conowingo Hydroelectric Station | MD0120006 | NTNCWS | Darlington | 90 | Harford County |
| Conowingo Mobile Home Park | MD0070214 | CWS | Lancaster | 250 | Cecil County |
| Cook'S Trailer Court (Aka Garrett Tp) | MD0180210 | CWS | Prince Frederick | 120 | St. Mary's County |
| Copper Hill Corporate Center | MD1100077 | NTNCWS | Myersville | 129 | Frederick County |
| Copperfield | MD0100037 | CWS | Frederick | 338 | Frederick County |
| Corner Campus | MD1220037 | NTNCWS | Salisbury | 70 | Wicomico County |
| Country Lakes | MD0180023 | CWS | California | 3,016 | St. Mary's County |
| Country Meadows Of Frederick | MD0100047 | CWS | Frederick | 295 | Frederick County |
| Country Village Mobile Home Park | MD0220213 | CWS | Clarksburg | 38 | Wicomico County |
| Cove Point Lng, Lp | MD1040077 | NTNCWS | Lusby | 217 | Calvert County |
| Cp Holdings Llc | MD1020154 | NTNCWS | Millersville | 125 | Anne Arundel County |
| Creative Beginnings Pre-School & Daycare | MD1180008 | NTNCWS | California | 100 | St. Mary's County |
| Creative Childrens Center | MD1100055 | NTNCWS | Jefferson | 65 | Frederick County |
| Creative Ways Learning Center | MD1121029 | NTNCWS | Cardiff | 30 | Harford County |
| Crellin | MD0110003 | CWS | Oakland | 230 | Garrett County |
| Crofton Childrens Center | MD1020046 | NTNCWS | Gambrills | 91 | Anne Arundel County |
| Cross Point Subdivision | MD0040052 | CWS | Prince Frederick | 434 | Calvert County |
| Crossroads Child Development Center | MD1021593 | NTNCWS | Davidsonville | 41 | Anne Arundel County |
| Crossroads Station | MD1121126 | NTNCWS | Windsor Mill | 25 | Harford County |
| Crownsville Hospital Center | MD0020009 | CWS | Millersville | 1,348 | Anne Arundel County |
| Crystal Beach Manor/T&C Utility | MD0070008 | CWS | Timonium | 500 | Cecil County |
| Darling Ingredients Company | MD1090027 | NTNCWS | Winchester | 100 | Dorchester County |
| Darlington Mobile Home Park | MD0120214 | CWS | Farmington Hills | 150 | Harford County |
| Davidsonville Elementary | MD1020012 | NTNCWS | Pasadena | 650 | Anne Arundel County |
| Dawn'S Early Light Early Childhood Ctr | MD1040084 | NTNCWS | Huntingtown | 81 | Calvert County |
| Dayton Oaks Elementary School | MD1130041 | NTNCWS | Ellicott City | 595 | Howard County |
| Deal Island School | MD1190007 | NTNCWS | Westover | 152 | Somerset County |
| Deale Elementary | MD1020013 | NTNCWS | Pasadena | 345 | Anne Arundel County |
| Deep Creek Lake Water Service Area | MD1111096 | CWS | Mountain Lake Park | 5,502 | Garrett County |
| Deep Roots Inc. | MD0070036 | CWS | Earleville | 60 | Cecil County |
| Deer Lodge Mobile Home Park | MD0210202 | CWS | Greencastle | 87 | Washington County |
| Delmarva Early Learning Center | MD1220048 | NTNCWS | Salisbury | 120 | Wicomico County |
| Delmarva Mobile Home Park | MD0230203 | CWS | Ocean City | 62 | Worcester County |
| Dentsville Trading Company, Inc. | MD1081098 | NTNCWS | La Plata | 90 | Charles County |
| Dod Purveyor | MD1080045 | NTNCWS | Baltimore | 132 | Charles County |
| Dorchester Country Estates M.H.P. | MD0090220 | CWS | Delmar | 118 | Dorchester County |
| Dover Bridge Ii Mobile Home Park | MD0050218 | CWS | Easton | 35 | Caroline County |
| Dover Bridge Park | MD0050209 | CWS | Durham | 100 | Caroline County |
| Dr. Thomas Higdon Elementary | MD1080031 | NTNCWS | La Plata | 488 | Charles County |
| Du Mar Estates Water Company | MD0080010 | CWS | Marbury | 150 | Charles County |
| Dublin Elementary School | MD1120007 | NTNCWS | Bel Air | 308 | Harford County |
| Duck In And Mcdonalds And Dollar General | MD1231183 | NTNCWS | Snow Hill | 49 | Worcester County |
| Dunkirk Business Center | MD1041027 | NTNCWS | Owings | 250 | Calvert County |
| Dunkirk Market Place | MD1040064 | NTNCWS | Gaithersburg | 50 | Calvert County |
| Dunkirk Medical Center | MD1040070 | NTNCWS | Prince Frederick | 200 | Calvert County |
| Dunkirk Professional Building | MD1041210 | NTNCWS | Dunkirk | 110 | Calvert County |
| Dunkirk Safeway Store #1129 | MD1040069 | NTNCWS | Malvern | 25 | Calvert County |
| Dunkirk Town Square Shopping Center | MD1041094 | NTNCWS | Silver Spring | 40 | Calvert County |
| Dunkirk Village Shopping Center | MD1041077 | NTNCWS | Dunkirk | 25 | Calvert County |
| Dynard Elementary School | MD1180010 | NTNCWS | Loveville | 450 | St. Mary's County |
| Eagle'S Nest Golf And Country Club | MD1030059 | NTNCWS | Phoenix | 70 | Baltimore County |
| Eastern Shore Early Learning Center | MD1230086 | NTNCWS | Berlin | 84 | Worcester County |
| Eastman Specialties Corporation | MD1140009 | NTNCWS | Kingsport | 44 | Kent County |
| Eden Head Start | MD1190009 | NTNCWS | 200 | Somerset County | |
| Eden Mobile Home Park | MD0190205 | CWS | Fruitland | 250 | Somerset County |
| Edesville | MD0140009 | CWS | Chestertown | 296 | Kent County |
| Edgemeade Road Re, Llc. | MD0160203 | NTNCWS | 25 | Prince George's County | |
| Edrich Lumber Company | MD1031037 | NTNCWS | Windsor Mill | 60 | Baltimore County |
| El Rancho Mobile Home Park | MD0210204 | CWS | Lapeer | 86 | Washington County |
| Elk Neck Elementary | MD1070043 | NTNCWS | Elkton | 605 | Cecil County |
| Elk Ridge Lake | MD0210006 | CWS | Hagerstown | 120 | Washington County |
| Elkridge Estates Of Roland Park | MD0030018 | CWS | Tysons | 414 | Baltimore County |
| Ellenwood | MD0080057 | CWS | La Plata | 229 | Charles County |
| Elvaton Christian Academy | MD1021500 | NTNCWS | Millersville | 85 | Anne Arundel County |
| Epping Forest | MD0020011 | CWS | 500 | Anne Arundel County | |
| Ewell Waterworks Cooperative | MD0190004 | CWS | Tylerton | 75 | Somerset County |
| Fahrney-Keedy Senior Living Community | MD0210213 | CWS | Boonsboro | 250 | Washington County |
| Fair Meadows | MD1120008 | NTNCWS | Bel Air | 50 | Harford County |
| Fairhaven School | MD1160043 | NTNCWS | Upper Marlboro | 70 | Prince George's County |
| Fairland Crossing Apartments | MD0150102 | CWS | 1,248 | Montgomery County | |
| Fairlee | MD0140003 | CWS | Chestertown | 725 | Kent County |
| Fairmount | MD0190012 | CWS | Princess Anne | 750 | Somerset County |
| Fairview Centre, Inc. | MD1040086 | NTNCWS | Owings | 30 | Calvert County |
| Faith Baptist Church & School | MD1220011 | NTNCWS | Salisbury | 125 | Wicomico County |
| Fallston Child Care Center | MD1120010 | NTNCWS | Fallston | 87 | Harford County |
| Fallston High School | MD1120012 | NTNCWS | Bel Air | 1,113 | Harford County |
| Fallston Middle School | MD1120051 | NTNCWS | Bel Air | 1,041 | Harford County |
| Federal Law Enforcement Training Center | MD0160018 | NTNCWS | Clinton | 120 | Prince George's County |
| Fenwick Manor | MD0180020 | CWS | California | 234 | St. Mary's County |
| Fifth District Elementary | MD1030013 | NTNCWS | Baltimore | 301 | Baltimore County |
| Finksburg Plaza Shopping Center | MD1060019 | NTNCWS | Finksburg | 150 | Carroll County |
| Flintstone Elementary School | MD1010001 | NTNCWS | Lonaconing | 240 | Allegany County |
| Folly Quarter Middle School | MD1130028 | NTNCWS | Ellicott City | 667 | Howard County |
| Forest Green Court Mobile Home Park | MD0070217 | CWS | Port Deposit | 212 | Cecil County |
| Forest Hill Elementary School | MD1120014 | NTNCWS | Bel Air | 637 | Harford County |
| Forest Hill Nature Preschool & Childcare | MD1120054 | NTNCWS | Forest Hill | 150 | Harford County |
| Forrest Farm Subdivision | MD0180054 | CWS | California | 577 | St. Mary's County |
| Forwardgro Llc | MD1020153 | NTNCWS | Lothain | 38 | Anne Arundel County |
| Fountain Green Mobile Home Park | MD0120208 | CWS | Havre De Grace | 55 | Harford County |
| Fountain Rock Elementary | MD1210005 | NTNCWS | 260 | Washington County | |
| Fountaindale South | MD0100013 | CWS | Frederick | 2,610 | Frederick County |
| Four Seasons Park Inc. | MD0230210 | CWS | Ocean City | 25 | Worcester County |
| Fox Meadow | MD0180041 | CWS | California | 128 | St. Mary's County |
| Fox Run Condominiums, Inc. | MD0170010 | CWS | Sunderland | 85 | Queen Anne's County |
| Francis Scott Key Family Resort | MD1230070 | NTNCWS | Ocean City | 40 | Worcester County |
| Frederick Baptist Church & School | MD1100076 | NTNCWS | Fredrick | 267 | Frederick County |
| Frederick Christian Academy | MD1100065 | NTNCWS | Frederick | 150 | Frederick County |
| Friendly Farms | MD1031052 | NTNCWS | Upperco | 55 | Baltimore County |
| Friends Meeting School | MD1100061 | NTNCWS | Ijamsville | 40 | Frederick County |
| Gaither Manor Apartments | MD0060202 | CWS | Sykesville | 450 | Carroll County |
| Gale-Bailey Elementary | MD1080007 | NTNCWS | La Plata | 497 | Charles County |
| Galilee Lutheran Church And Day Care | MD1021661 | NTNCWS | Pasadena | 80 | Anne Arundel County |
| Gambrills Business Park | MD1020124 | NTNCWS | Millersville | 80 | Anne Arundel County |
| Garden Estates Central Water | MD0080015 | CWS | La Plata | 55 | Charles County |
| Gateway Village Mobile Home Park | MD0220204 | CWS | Delmar | 60 | Wicomico County |
| Gaylord National Resort | MD1160053 | NTNCWS | Naperville | 4,250 | Prince George's County |
| Georgetown Yacht Haven | MD1141020 | NTNCWS | Annapolis | 28 | Kent County |
| Gerstell Academy | MD1060069 | NTNCWS | Cockeysville | 350 | Carroll County |
| Gibson Island | MD0020013 | CWS | Millersville | 275 | Anne Arundel County |
| Glen Arm Llc | MD1030040 | NTNCWS | Essex | 75 | Baltimore County |
| Glen Arm Maintenance Fclty/Ulla Popken | MD1030052 | NTNCWS | Millersville | 275 | Baltimore County |
| Glen Meadows Retirement Community | MD0030208 | CWS | Glen Arm | 468 | Baltimore County |
| Glenelg High School | MD1130004 | NTNCWS | Ellicott City | 1,532 | Howard County |
| Glenelg Um Church And Nursery School | MD1131013 | NTNCWS | Glenelg | 39 | Howard County |
| Glenstone Museum | MD1150051 | NTNCWS | Potomac | 725 | Montgomery County |
| Glenwood Community Center | MD1131318 | NTNCWS | Columbia | 366 | Howard County |
| Glenwood Office Park | MD1130011 | NTNCWS | Frederick | 75 | Howard County |
| Glotfelty Enterprises | MD1110023 | NTNCWS | Oakland | 33 | Garrett County |
| Golden Acres Mobile Home Park | MD0200206 | CWS | Landover | 48 | Talbot County |
| Golden Kay Apartments | MD0070202 | CWS | Elkton | 148 | Cecil County |
| Gorman | MD0110012 | CWS | Oakland | 150 | Garrett County |
| Grace Christian Academy | MD1080033 | NTNCWS | Waldorf | 410 | Charles County |
| Grace Medical Center | MD1300006 | NTNCWS | Baltimore | 325 | Baltimore city |
| Grace Pointe Church Of The Nazarene | MD1020145 | NTNCWS | Severn | 154 | Anne Arundel County |
| Gramercy Llc (Aka Koinonia Partnership ) | MD0030023 | CWS | Stevenson | 40 | Baltimore County |
| Grandview Haven | MD0180059 | CWS | California | 269 | St. Mary's County |
| Granite Mobile Home Park | MD0030204 | CWS | Bethesda | 96 | Baltimore County |
| Grasonville | MD0170020 | CWS | Stevensville | 600 | Queen Anne's County |
| Grauls Superthrift Market | MD1031060 | NTNCWS | Parkton | 25 | Baltimore County |
| Graymount Apartments | MD0070203 | CWS | Perryville | 27 | Cecil County |
| Greater Annapolis Veterinary Hospital | MD1020117 | NTNCWS | Annapolis | 30 | Anne Arundel County |
| Green Meadows Compact Homes | MD0220201 | CWS | Herndon | 86 | Wicomico County |
| Green Meadows Water Company | MD0080017 | CWS | Indian Head | 132 | Charles County |
| Green Ridge Boys Camp | MD0010212 | CWS | Cascade | 100 | Allegany County |
| Green Valley Plaza | MD1100058 | NTNCWS | Cockeysville | 50 | Frederick County |
| Green Valley Shopping Center | MD1100059 | NTNCWS | Monrovia | 40 | Frederick County |
| Greenbrier | MD0180045 | CWS | California | 1,161 | St. Mary's County |
| Greenbrier Elementary School | MD1210006 | NTNCWS | 370 | Washington County | |
| Greenhouse Early Learning Center | MD1040029 | NTNCWS | Huntingtown | 42 | Calvert County |
| Greenway Apartments | MD0220231 | CWS | Herndon | 40 | Wicomico County |
| Grover Place - 460 Welcome Lane | MD1040101 | NTNCWS | Saint Leonard | 27 | Calvert County |
| Grover Place Child Care Center | MD1040097 | NTNCWS | Saint Leonard | 67 | Calvert County |
| Gunston Day School | MD0170201 | NTNCWS | Centreville | 150 | Queen Anne's County |
| Harbor View | MD0070025 | CWS | Newark | 437 | Cecil County |
| Harbour Light Estates Community | MD0220212 | CWS | Salisbury | 95 | Wicomico County |
| Harford Academy | MD1120024 | NTNCWS | Bel Air | 292 | Harford County |
| Harford Center Inc. | MD1120016 | NTNCWS | Havre De Grace | 150 | Harford County |
| Harford Christian School | MD1120017 | NTNCWS | Darlington | 500 | Harford County |
| Harford Community College | MD1120064 | NTNCWS | Bel Air | 713 | Harford County |
| Harford Community College - Main Campus | MD1120018 | NTNCWS | Bel Air | 2,500 | Harford County |
| Harford County Airport | MD1120066 | NTNCWS | Churchville | 50 | Harford County |
| Harford Technical High School | MD1120035 | NTNCWS | Bel Air | 1,187 | Harford County |
| Harman Subdivision | MD0050007 | CWS | Reading | 35 | Caroline County |
| Hart Heritage | MD0120021 | CWS | Street | 37 | Harford County |
| Havre De Grace Quarry | MD1120061 | NTNCWS | Havre De Grace | 75 | Harford County |
| Hawthorne Water Supply, Inc | MD0080018 | CWS | Waldorf | 60 | Charles County |
| Hayfields Country Club | MD1030071 | NTNCWS | Hunt Valley | 30 | Baltimore County |
| Headquarters I / Headquarters Ii | MD1020119 | NTNCWS | Severna Park | 63 | Anne Arundel County |
| Hearts Desire | MD0180044 | CWS | California | 65 | St. Mary's County |
| Hebron Woods Mobile Home Park | MD0220224 | CWS | Richmond | 250 | Wicomico County |
| Heidelberg Materials Us Cement Llc | MD1060074 | NTNCWS | Union Bridge | 60 | Carroll County |
| Henry E. Lackey High School | MD1080015 | NTNCWS | La Plata | 1,187 | Charles County |
| Herald Harbor | MD0020044 | CWS | Millersville | 2,241 | Anne Arundel County |
| Hereford High School | MD1030017 | NTNCWS | Baltimore | 1,300 | Baltimore County |
| Hereford Middle School | MD1030018 | NTNCWS | Baltimore | 1,050 | Baltimore County |
| Heritage Academy | MD1210007 | NTNCWS | Hagerstown | 240 | Washington County |
| Heritage Mobile Home Park | MD0090224 | CWS | East New Market | 80 | Dorchester County |
| Herring Creek Professional Center | MD1230080 | NTNCWS | Ocean City | 30 | Worcester County |
| Hertrich Family Of Auto Dealerships | MD1230054 | NTNCWS | Milford | 50 | Worcester County |
| Hertrich Of Pocomoke South Inc. | MD1230063 | NTNCWS | Milford | 35 | Worcester County |
| Hh&P Iv, Llc | MD1020101 | NTNCWS | Annapolis | 100 | Anne Arundel County |
| Hickory Child Development,Nazarene Churc | MD1121254 | NTNCWS | Bel Air | 172 | Harford County |
| Highfield | MD0210001 | CWS | Smithsburg | 1,141 | Washington County |
| Highland Community Asc./Child. Cntr. N. | MD1120031 | NTNCWS | Street | 165 | Harford County |
| Highland Crossing Shopping Center | MD1130044 | NTNCWS | Towson | 88 | Howard County |
| Hill Waterworks Cooperative | MD0190007 | CWS | Tylerton | 100 | Somerset County |
| Hillandale Mobile Home Park | MD0060206 | CWS | Belle Mead | 220 | Carroll County |
| Holiday Inn Express Ocean City | MD1230088 | NTNCWS | Newton | 255 | Worcester County |
| Holiday Mobile Estates, Inc. | MD0020211 | CWS | Jessup | 900 | Anne Arundel County |
| Holland Forest | MD0180051 | CWS | California | 139 | St. Mary's County |
| Holly Cove Harbor Mobile Home Park | MD0050206 | CWS | Federalsburg | 45 | Caroline County |
| Holly Grove Christian School | MD1190023 | NTNCWS | Westover | 278 | Somerset County |
| Hollywood Elementary School | MD1180019 | NTNCWS | Loveville | 600 | St. Mary's County |
| Homestead Gardens | MD1020109 | NTNCWS | Davidsonville | 90 | Anne Arundel County |
| Horn Point Lab. - Ctr. For Env. Science | MD1090018 | NTNCWS | Cambridge | 125 | Dorchester County |
| Howlin Building | MD1041201 | NTNCWS | Dunkirk | 25 | Calvert County |
| Hunt Valley Golf & Country Club | MD1031071 | NTNCWS | Phoenix | 200 | Baltimore County |
| Hunters Brooke/Falcon Ridge Subd | MD0080083 | CWS | La Plata | 614 | Charles County |
| Hunting Hills | MD0040006 | CWS | Prince Frederick | 124 | Calvert County |
| Hunting Quarters | MD0180038 | CWS | California | 715 | St. Mary's County |
| Huntingtown Elementary School | MD1040027 | NTNCWS | Prince Frederick | 609 | Calvert County |
| Huntingtown High School | MD1040075 | NTNCWS | Prince Frederick | 1,540 | Calvert County |
| Hyatt Center | MD1100045 | NTNCWS | Ijamsville | 50 | Frederick County |
| Hyatt Park #1 | MD1100010 | NTNCWS | Ijamsville | 75 | Frederick County |
| I-70 Auto Mall | MD1210016 | NTNCWS | Hagerstown | 85 | Washington County |
| I-97 Office Complex | MD1020116 | NTNCWS | Baltimore | 175 | Anne Arundel County |
| Idlewood Park | MD0080205 | CWS | Crofton | 320 | Charles County |
| Independence Village | MD0080019 | CWS | Charlotte Hall | 88 | Charles County |
| Indian Creek Upper/Middle School | MD1020134 | NTNCWS | Crownsville | 400 | Anne Arundel County |
| Inspired Minds Early Childhood Center | MD1040054 | NTNCWS | Huntingtown | 33 | Calvert County |
| Inwood Village Center | MD1130032 | NTNCWS | Glenelg | 534 | Howard County |
| Ise America Inc.-Warwick Egg Processing | MD1070068 | NTNCWS | Warwick | 35 | Cecil County |
| Island Resort Campground | MD1231275 | NTNCWS | Newark | 45 | Worcester County |
| Its All About The Kids | MD1070061 | NTNCWS | Elkton | 31 | Cecil County |
| Jacksonville Elementary | MD1030068 | NTNCWS | Baltimore | 618 | Baltimore County |
| Jacobs Well Assisted Living Home | MD1120022 | NTNCWS | Bel Air | 31 | Harford County |
| Jarrettsville Elementary | MD1120023 | NTNCWS | Bel Air | 528 | Harford County |
| Jarrettsville Veterinary Center | MD1120067 | NTNCWS | Jarrettsville | 89 | Harford County |
| Jefferson Patterson Park And Museum | MD1041131 | NTNCWS | St. Leonard | 35 | Calvert County |
| Jefferson Pike Warehouse Condo Inc. | MD1100012 | NTNCWS | Frederick | 53 | Frederick County |
| Jemals Bay 50 Plaza | MD1020132 | NTNCWS | Washington | 50 | Anne Arundel County |
| Johns Hopkins Bayview Medical Center | MD1300008 | NTNCWS | Baltimore | 950 | Baltimore city |
| Johns Hopkins Hospital | MD1300001 | NTNCWS | Baltimore | 2,000 | Baltimore city |
| Johns Hopkins University | MD0300007 | CWS | Baltimore | 2,058 | Baltimore city |
| Jonestown Water System | MD0050004 | CWS | Denton | 150 | Caroline County |
| Kabik Court | MD1060086 | NTNCWS | Westminster | 40 | Carroll County |
| Kaufmanns Office Building | MD1020141 | NTNCWS | Queenstown | 25 | Anne Arundel County |
| Kelly Foods, Inc. | MD1230053 | NTNCWS | Berlin | 95 | Worcester County |
| Kelly Generator & Equipment Company | MD1040096 | NTNCWS | Upper Marlboro | 30 | Calvert County |
| Kemptown Elementary | MD1100013 | NTNCWS | Frederick | 623 | Frederick County |
| Kennedyville | MD0140005 | CWS | Chestertown | 300 | Kent County |
| Kent Island Shopping Center | MD1170025 | NTNCWS | Washington | 88 | Queen Anne's County |
| Kent School, Inc. | MD1140005 | NTNCWS | Chestertown | 225 | Kent County |
| Kenwood Beach | MD0040007 | CWS | Prince Frederick | 338 | Calvert County |
| Keswick Multi-Care Center | MD0300005 | CWS | Baltimore | 575 | Baltimore city |
| Key School | MD1020018 | NTNCWS | Annapolis | 820 | Anne Arundel County |
| Keysers Ridge | MD0110025 | CWS | Mountain Lake Park | 63 | Garrett County |
| Kiddie Kampus | MD1220033 | NTNCWS | Pittsville | 35 | Wicomico County |
| Kids Campus Early Learning Center | MD1040100 | NTNCWS | Dunkirk | 60 | Calvert County |
| Kids Farm Childcare - Davidsonville | MD1020095 | NTNCWS | Davidsonville | 43 | Anne Arundel County |
| Kids Villa Learning Center Llc | MD1100067 | NTNCWS | Ijamsville | 150 | Frederick County |
| Kindercare Learning Center #1061 | MD1020058 | NTNCWS | Hanover | 120 | Anne Arundel County |
| King & Kennedy | MD0180008 | CWS | California | 169 | St. Mary's County |
| Kings Manor - White Plains Water Co, Inc | MD0080024 | CWS | Waldorf | 372 | Charles County |
| Kingsville Elementary School | MD1030021 | NTNCWS | Baltimore | 391 | Baltimore County |
| Kleins Shoprite (Cardiff) #555 | MD1121092 | NTNCWS | Forest Hill | 25 | Harford County |
| Kleins Shoprite - Jacksonville | MD1031362 | NTNCWS | Forest Hill | 64 | Baltimore County |
| Knolls Of Windsor | MD0100041 | CWS | Frederick | 1,553 | Frederick County |
| Knowledge Farms | MD1100068 | NTNCWS | Ijamsville | 25 | Frederick County |
| Lake Haven Mobile Home Park | MD0230206 | CWS | Pittsford | 384 | Worcester County |
| Lake Shore Elementary | MD1020019 | NTNCWS | Pasadena | 350 | Anne Arundel County |
| Lake Village Townhomes | MD0020019 | CWS | Severn | 2,400 | Anne Arundel County |
| Lakeside Village | MD0210215 | CWS | Hagerstown | 1,575 | Washington County |
| Lakeview Mhp Llc | MD0060208 | CWS | Ellicott City | 76 | Carroll County |
| Lakewood | MD0040008 | CWS | Prince Frederick | 203 | Calvert County |
| Langley Mobile Home Park | MD0180212 | CWS | Linthicum Heights | 175 | St. Mary's County |
| Laurel Ridge | MD0180037 | CWS | California | 560 | St. Mary's County |
| Laurel Water Supply | MD0080026 | CWS | 50 | Charles County | |
| Leeds Elementary | MD1070020 | NTNCWS | Elkton | 372 | Cecil County |
| Leonardtown Farm | MD0180057 | CWS | California | 193 | St. Mary's County |
| Leonardtown High School | MD1180024 | NTNCWS | Loveville | 1,750 | St. Mary's County |
| Leonardtown Middle School & Forrest Tech | MD1180026 | NTNCWS | Loveville | 1,200 | St. Mary's County |
| Leonardtown S.H.A./ S.H.A. Maint. | MD1181326 | NTNCWS | Leonardtown | 336 | St. Mary's County |
| Lettie Marshall Dent Elementary | MD1180027 | NTNCWS | Loveville | 650 | St. Mary's County |
| Lewistown Elementary | MD1100015 | NTNCWS | Frederick | 267 | Frederick County |
| Lexington Estates | MD0180207 | CWS | Farmington Hills | 300 | St. Mary's County |
| Liberty Christian School | MD1030048 | NTNCWS | Owings Mills | 320 | Baltimore County |
| Liberty Elementary | MD1100016 | NTNCWS | Frederick | 466 | Frederick County |
| Liberty Marina | MD1021479 | NTNCWS | Edgewater | 112 | Anne Arundel County |
| Liberty Mobile Home Park | MD0050207 | CWS | Federalsburg | 40 | Caroline County |
| Libertytown Apartments | MD0100036 | CWS | Frederick | 97 | Frederick County |
| Libertytown East | MD0100038 | CWS | Frederick | 140 | Frederick County |
| Lighthouse Christian Child Care Center | MD1220055 | NTNCWS | Hebron | 61 | Wicomico County |
| Lighthouse Senior Living Ellicott City | MD0130006 | CWS | Owings Mills | 113 | Howard County |
| Lineage Logistics | MD1050014 | NTNCWS | Milford | 75 | Caroline County |
| Linganore High School | MD1100017 | NTNCWS | Frederick | 1,722 | Frederick County |
| Link - 3951 Dartmouth Ct | MD1100073 | NTNCWS | Lutherville | 32 | Frederick County |
| Link - 4780 Winchester Boulevard | MD1100074 | NTNCWS | Lutherville | 32 | Frederick County |
| Lisbon Elementary School | MD1130006 | NTNCWS | Ellicott City | 492 | Howard County |
| Lisbon Shopping Center/Harvest Fair | MD1130013 | NTNCWS | Baltimore | 80 | Howard County |
| Little Feet Shiloh | MD1061286 | NTNCWS | Hampstead | 90 | Carroll County |
| Little Flower School | MD1180028 | NTNCWS | Great Mills | 380 | St. Mary's County |
| Little Lights Child Ctr/First Baptist Ch | MD1101338 | NTNCWS | Frederick | 54 | Frederick County |
| Little Travelers Day Care & Learning Ctr | MD1100064 | NTNCWS | Mount Airy | 57 | Frederick County |
| Loch Raven Va Medical Center | MD1300002 | NTNCWS | Baltimore | 330 | Baltimore city |
| Lodgecliffe Distribution System | MD0090009 | CWS | Cambridge | 300 | Dorchester County |
| Long Point Mall | MD1021363 | NTNCWS | Ownings Mills | 30 | Anne Arundel County |
| Lord Calvert Trailer Park | MD0180213 | CWS | Lexington Park | 892 | St. Mary's County |
| Lothian Elementary | MD1020020 | NTNCWS | Pasadena | 476 | Anne Arundel County |
| Lucrezias Childcare | MD1040053 | NTNCWS | Huntingtown | 89 | Calvert County |
| Lucy School (Ecofarm, Inc.) | MD1100062 | NTNCWS | Middletown | 119 | Frederick County |
| Lula G. Scott Community Center | MD1021181 | NTNCWS | Millersville | 46 | Anne Arundel County |
| Lutheran Village At Miller'S Grant | MD0130007 | CWS | Ellicott City | 315 | Howard County |
| Lyons Creek Estates | MD0020213 | CWS | Lothian | 750 | Anne Arundel County |
| Lyons Creek Shopping Center | MD1041151 | NTNCWS | Upper Marlboro | 95 | Calvert County |
| M.R.D.C. Head Start | MD1050017 | NTNCWS | Greensboro | 61 | Caroline County |
| Malcolm Elementary School | MD1080016 | NTNCWS | La Plata | 446 | Charles County |
| Manor Care Health Services Roland Park | MD1300010 | NTNCWS | Baltimore | 216 | Baltimore city |
| Maple Hill Mobile Estates | MD0070223 | CWS | Port Deposit | 180 | Cecil County |
| Mardela Middle/High School | MD1220016 | NTNCWS | Salisbury | 735 | Wicomico County |
| Margaret Brent Middle School | MD1180032 | NTNCWS | Loveville | 1,050 | St. Mary's County |
| Mariellen Park | MD0080028 | CWS | La Plata | 184 | Charles County |
| Marley Run | MD0040053 | CWS | Prince Frederick | 290 | Calvert County |
| Martin Marietta - Churchville Quarry | MD1120039 | NTNCWS | North East | 37 | Harford County |
| Martingham Utilities Cooperative | MD0200004 | CWS | St. Michaels | 675 | Talbot County |
| Maryland Environmental Service | MD1020133 | NTNCWS | Millersville | 152 | Anne Arundel County |
| Maryland Manor Mobile Home Park | MD0020214 | CWS | Lothian | 810 | Anne Arundel County |
| Marymed Llc Ground Water | MD1140011 | NTNCWS | Hurlock | 48 | Kent County |
| Maryvale Preparatory School | MD1030025 | NTNCWS | Lutherville | 380 | Baltimore County |
| Mater Amoris Montessori School | MD1150014 | NTNCWS | Ashton | 155 | Montgomery County |
| Mattawoman W.W.T.P. | MD1080017 | NTNCWS | La Plata | 110 | Charles County |
| Matthews Manor | MD0080027 | CWS | Newburg | 45 | Charles County |
| Maurice J. Mcdonough High School | MD1080019 | NTNCWS | La Plata | 1,050 | Charles County |
| Maybelle Manor Mobile Home Park | MD0070248 | CWS | Lancaster | 50 | Cecil County |
| Mayo Center And Apartments | MD1021462 | CWS | Annapolis | 60 | Anne Arundel County |
| Mayo Elementary | MD1020021 | NTNCWS | Pasadena | 375 | Anne Arundel County |
| Md American Water - Pinto | MD0010003 | CWS | Belair | 2,615 | Allegany County |
| Md American Water Greenridge | MD0120011 | CWS | Belair | 2,351 | Harford County |
| Md American Water Highland Estates | MD0010049 | CWS | Belair | 100 | Allegany County |
| Md American Water Lakeside Vista | MD0120014 | CWS | Belair | 226 | Harford County |
| Meadowbrook Court | MD0050208 | CWS | Kelton | 50 | Caroline County |
| Mechanicsville Elementary | MD1060054 | NTNCWS | Westminster | 600 | Carroll County |
| Mechanicsville Elementary | MD1180035 | NTNCWS | Loveville | 350 | St. Mary's County |
| Messiah Lutheran Nursery | MD1060030 | NTNCWS | Sykesville | 25 | Carroll County |
| Metropolitan Of Baltimore | MD0300006 | CWS | Tysons | 414 | Baltimore city |
| Midlothian Water Company | MD0010023 | CWS | Midlothian | 300 | Allegany County |
| Midtown Waterworks Cooperative | MD0190006 | CWS | Tylerton | 34 | Somerset County |
| Millersville Elementary | MD1020022 | NTNCWS | Pasadena | 412 | Anne Arundel County |
| Millington Distribution System | MD0140012 | CWS | Chestertown | 260 | Kent County |
| Miss Loretta'S Early Learning Center | MD1100078 | NTNCWS | Keymar | 45 | Frederick County |
| Misty Meadows 1 / Highland Hills M.H.P. | MD0070247 | CWS | Street | 460 | Cecil County |
| Misty Meadows 2 Mobile Home Park | MD0070249 | CWS | Street | 70 | Cecil County |
| Monkton Country Day Care & Preschool | MD1030062 | NTNCWS | Monkton | 40 | Baltimore County |
| Monocacy Elementary School | MD1150018 | NTNCWS | Montgomery Village | 351 | Montgomery County |
| Montessori Intl. Childrens House | MD1020066 | NTNCWS | Annapolis | 177 | Anne Arundel County |
| Montessori School Of Westminster | MD1060075 | NTNCWS | Westminster | 200 | Carroll County |
| Montgomery Co Resource Recovery Facility | MD1150046 | NTNCWS | Dickerson | 64 | Montgomery County |
| Most Blessed Sacrament School | MD1230079 | NTNCWS | Berlin | 244 | Worcester County |
| Mother Catherine Academy | MD1180036 | NTNCWS | Mechanicsville | 250 | St. Mary's County |
| Mount Aetna | MD0210015 | CWS | Hagerstown | 688 | Washington County |
| Mount Airy Christian Academy | MD1130025 | NTNCWS | Mount Airy | 435 | Howard County |
| Mount Aviat Academy | MD1070024 | NTNCWS | Childs | 310 | Cecil County |
| Mount Carmel Woods | MD0080030 | CWS | La Plata | 175 | Charles County |
| Mount Pleasant Water Co., Inc. | MD0180009 | CWS | Waldorf | 150 | St. Mary's County |
| Mount Saint Marys University | MD0100019 | CWS | Emmitsburg | 2,700 | Frederick County |
| Mount Savage School | MD1010003 | NTNCWS | Cumberland | 665 | Allegany County |
| Mount Washington Pediatric Hospital | MD1300007 | NTNCWS | Baltimore | 870 | Baltimore city |
| Mountain Branch Golf Course Clubhouse | MD1121244 | NTNCWS | Joppa | 40 | Harford County |
| Mountain Hill Water Company | MD0070034 | CWS | Newark | 2,154 | Cecil County |
| Mountain Manor Treatment Center | MD1100020 | NTNCWS | Emmitsburg | 150 | Frederick County |
| Ms. Bevs Place | MD1040004 | NTNCWS | Dunkirk | 75 | Calvert County |
| Mt. Airy Nursing & Rehab | MD0060211 | CWS | Mount Airy | 104 | Carroll County |
| Mt. Harmony Elementary School | MD1040030 | NTNCWS | Prince Frederick | 706 | Calvert County |
| Mt. Harmony United Methodist Church | MD1041231 | NTNCWS | Owings | 120 | Calvert County |
| Mt. Hope/ Nanjemoy Elementary School | MD1080021 | NTNCWS | La Plata | 385 | Charles County |
| Mt. Zion Um Church And Preschool | MD1131108 | NTNCWS | Highland | 47 | Howard County |
| Mulberry South | MD0180042 | CWS | California | 65 | St. Mary's County |
| Mutual Elementary School | MD1040032 | NTNCWS | Prince Frederick | 894 | Calvert County |
| N. Dorchester Middle & High Schools | MD1090010 | NTNCWS | Cambridge | 1,500 | Dorchester County, Wicomico County |
| N.I.H. Animal Center | MD1150040 | NTNCWS | Laurel | 150 | Montgomery County |
| Nantucket Point(Distribution-Delaware) | MD0230020 | CWS | Berlin | 500 | Worcester County |
| National Institutes Of Health | MD1150047 | NTNCWS | Bethesda | 1,100 | Montgomery County |
| Naval Research Lab Blossom Pt (Navy Fac) | MD1080022 | NTNCWS | Washington | 145 | Charles County |
| Naval Research Lab., Chesapeake Bay Div. | MD0040019 | NTNCWS | Chesapeake Beach | 60 | Calvert County |
| Naval Support Facility, Stump Neck Annex | MD1080039 | NTNCWS | Indian Head | 495 | Charles County |
| Naylor Mill Village Mobile Home Park | MD0220221 | CWS | Fruitland | 180 | Wicomico County |
| Nazarene Day Care Center | MD1070026 | NTNCWS | Colora | 100 | Cecil County |
| Nelpine Mobile Home Park | MD0050210 | CWS | Queen Anne | 70 | Caroline County |
| Neutron Products, Inc. | MD1150044 | NTNCWS | Dickerson | 35 | Montgomery County |
| New Hope Presbyterian/Clc Preschool | MD1151075 | NTNCWS | 71 | Montgomery County | |
| New Midway Elementary | MD1100025 | NTNCWS | Frederick | 172 | Frederick County |
| New Windsor Quarry Maintenance Shop | MD1060084 | NTNCWS | Union Bridge | 25 | Carroll County |
| Newark | MD0230002 | CWS | Berlin | 325 | Worcester County |
| Newtown Estates - Tip Hill Water Co. | MD0080031 | CWS | Waldorf | 110 | Charles County |
| Newtown Village | MD0080032 | CWS | La Plata | 170 | Charles County |
| Nock'S Tire Service, Inc. | MD1230073 | NTNCWS | Pocomoke | 37 | Worcester County |
| Norrisville Elementary School | MD1120027 | NTNCWS | Bel Air | 231 | Harford County |
| North Bay Adventure Camp | MD1071018 | NTNCWS | North East | 166 | Cecil County |
| North Bend Elementary School | MD1120048 | NTNCWS | Bel Air | 534 | Harford County |
| North Caroline High School | MD1050013 | NTNCWS | Denton | 1,028 | Caroline County |
| North Carroll Community School | MD1060085 | NTNCWS | Westminster | 130 | Carroll County |
| North East Quarry | MD1070048 | NTNCWS | North East | 45 | Cecil County |
| North Harford Elementary | MD1120028 | NTNCWS | Bel Air | 464 | Harford County |
| North Harford High School | MD1120029 | NTNCWS | Bel Air | 1,346 | Harford County |
| North Harford Middle School | MD1120030 | NTNCWS | Bel Air | 1,084 | Harford County |
| Northern Middle & High Schools | MD1040034 | NTNCWS | Prince Frederick | 2,470 | Calvert County |
| Northfield Apartments | MD0220225 | CWS | Salisbury | 40 | Wicomico County |
| Northrop Grumman - Undersea Systems | MD1020037 | NTNCWS | Annapolis | 395 | Anne Arundel County |
| Northrop Grumman Systems Corporation | MD1070052 | NTNCWS | Elkton | 700 | Cecil County |
| Northwestern Elementary School | MD1220018 | NTNCWS | Salisbury | 310 | Wicomico County |
| Nvent Epg Millington | MD1170035 | NTNCWS | Millington | 175 | Queen Anne's County |
| Oak Hill Water Company, Llc | MD0080034 | CWS | Waldorf | 180 | Charles County |
| Oak Lane Mobile Home Park | MD0070226 | CWS | Port Deposit | 55 | Cecil County |
| Oak Ridge Mobile Home Park | MD0220209 | CWS | Fruitland | 150 | Wicomico County |
| Oak Terrace Mobile Home Park Llc | MD0220219 | CWS | Salisbury | 30 | Wicomico County |
| Oakwood | MD0080055 | CWS | 45 | Charles County | |
| Oblates Of St. Francis | MD1071359 | CWS | Elkton | 36 | Cecil County |
| Ocean Downs, Llc | MD1230067 | NTNCWS | Berlin | 235 | Worcester County |
| Ocean Landing | MD1230065 | NTNCWS | Baltimore | 50 | Worcester County |
| Odenton Commerce Center | MD1020150 | NTNCWS | Millersville | 163 | Anne Arundel County |
| Odyssey School | MD1030087 | NTNCWS | Stevenson | 250 | Baltimore County |
| Old Dominion Electric - Wildcat | MD1070064 | NTNCWS | Glen Allen | 30 | Cecil County |
| Old Forge Elementary School | MD1210009 | NTNCWS | 378 | Washington County | |
| Oldfields School | MD0030210 | NTNCWS | Sparks Glencoe | 36 | Baltimore County |
| Open Bible Christian Academy | MD1030089 | NTNCWS | Kingsville | 183 | Baltimore County |
| Opportunity Builders, Inc. | MD1020142 | NTNCWS | Millersville | 210 | Anne Arundel County |
| Oregon Grille | MD1031211 | NTNCWS | Cockeysville | 25 | Baltimore County |
| Our House Job Training Center For Youth | MD1150017 | NTNCWS | Brookeville | 30 | Montgomery County |
| Ourisman Automotive | MD1020115 | NTNCWS | Laurel | 90 | Anne Arundel County |
| Oyster Cove | MD0170011 | CWS | Stevensville | 600 | Queen Anne's County |
| Padonia Park Club | MD1030076 | NTNCWS | Cockeysville | 100 | Baltimore County |
| Paper Mill Village Shopping Center | MD1030060 | NTNCWS | Timonium | 300 | Baltimore County |
| Paradise Mennonite School | MD1210010 | NTNCWS | Hagerstown | 355 | Washington County |
| Paris Foods | MD1200009 | NTNCWS | Trappe | 25 | Talbot County |
| Paris Oaks / Days End | MD0040010 | CWS | Prince Frederick | 251 | Calvert County |
| Parkway Subdivision Water Company | MD0080035 | CWS | La Plata | 50 | Charles County |
| Patuxent Elementary School | MD1040066 | NTNCWS | Prince Frederick | 637 | Calvert County |
| Patuxent Mobile Estates | MD0020217 | CWS | Lothian | 450 | Anne Arundel County |
| Pavilions Office Park | MD1230074 | NTNCWS | Lynbrook | 150 | Worcester County |
| Perdue Farms Inc. - Feed Mill | MD1220021 | NTNCWS | Salisbury | 400 | Wicomico County |
| Perdue Farms Inc. - Main Office | MD1220020 | NTNCWS | 400 | Wicomico County | |
| Perdue Hatchery | MD1230047 | NTNCWS | Showell | 32 | Worcester County |
| Performance Foodservice- Carroll County | MD1060008 | NTNCWS | New Windsor | 217 | Carroll County |
| Perry Point V.A. Medical Center | MD0070017 | CWS | Perry Point | 2,000 | Cecil County |
| Persimmon Hills | MD0180046 | CWS | California | 514 | St. Mary's County |
| Peter Pan Learning Center | MD1130014 | NTNCWS | Marriotsville | 80 | Howard County |
| Pheasant Ridge Estates | MD0060210 | CWS | Mount Airy | 300 | Carroll County |
| Phoenix | MD0030017 | CWS | Baltimore | 31 | Baltimore County |
| Piccowaxen Middle School | MD1080023 | NTNCWS | La Plata | 722 | Charles County |
| Pilot Travel Center & Arbys Restaurant | MD1110028 | NTNCWS | Mcclure | 280 | Garrett County |
| Pin Oak Apartments | MD0230217 | CWS | Berlin | 40 | Worcester County |
| Pine Grove Early Learning Center | MD1031131 | NTNCWS | Parkton | 80 | Baltimore County |
| Pine Hill Water Company | MD0080036 | CWS | Waldorf | 140 | Charles County |
| Pine Hills | MD0070019 | CWS | Newark | 953 | Cecil County |
| Pine Springs Mhp | MD0170207 | CWS | 160 | Queen Anne's County | |
| Pine Trailer Park | MD0040210 | CWS | Lusby | 65 | Calvert County |
| Pine Tree Mobile Home Park | MD0220206 | CWS | Parsonsburg | 91 | Wicomico County |
| Piney Creek Corporation | MD0170021 | CWS | Chester | 31 | Queen Anne's County |
| Piney Point Elementary School | MD1180040 | NTNCWS | Loveville | 665 | St. Mary's County |
| Piney Point Landings | MD0180047 | CWS | California | 239 | St. Mary's County |
| Pivot Family Resource Center | MD1081133 | NTNCWS | Hughesville | 57 | Charles County |
| Playtime Child Care Center | MD1060076 | NTNCWS | Finskburg | 50 | Carroll County |
| Pleasant Hill Mobile Home Park | MD0070230 | CWS | Childs | 64 | Cecil County |
| Pleasant Valley | MD0060009 | CWS | Westminster | 150 | Carroll County |
| Pleasants Excavation Co., Inc. | MD1150016 | NTNCWS | 75 | Montgomery County | |
| Plim Plaza Hotel - Distribution | MD1231289 | NTNCWS | Ocean City | 380 | Worcester County |
| Plum Point Elementary School | MD1040063 | NTNCWS | Prince Frederick | 615 | Calvert County |
| Plum Point Middle School | MD1040065 | NTNCWS | Prince Frederick | 881 | Calvert County |
| Pohanka Ford Of Salisbury | MD1220044 | NTNCWS | Salisbury | 60 | Wicomico County |
| Pohanka Of Salisbury, Inc. | MD1221035 | NTNCWS | Salisbury | 214 | Wicomico County |
| Polings Mobile Home Park | MD0100210 | CWS | Frederick | 80 | Frederick County |
| Pomfret Estates - Utilco, Inc. | MD0080037 | CWS | Waldorf | 150 | Charles County |
| Pomonkey Water Company - Ford Heights | MD0080012 | CWS | Waldorf | 125 | Charles County |
| Pomunk Water Company Distribution System | MD0080084 | CWS | Waldorf | 340 | Charles County |
| Poplar Island | MD1200020 | NTNCWS | 45 | Talbot County | |
| Port Deposit | MD0070020 | CWS | Newark | 725 | Cecil County |
| Port Herman Beach | MD0070027 | NTNCWS | 80 | Cecil County | |
| Port Tobacco Dept Of Community Services | MD0080063 | NTNCWS | La Plata | 102 | Charles County |
| Port Tobacco Rv Resort | MD1081072 | NTNCWS | 200 | Charles County | |
| Potomac Heights | MD0080038 | CWS | Indian Head | 1,800 | Charles County |
| Powrmatic Inc. | MD1060036 | NTNCWS | Finksburg | 35 | Carroll County |
| Preston Autoplex | MD1091170 | NTNCWS | Preston | 125 | Dorchester County |
| Prettyboy Elementary School | MD1030028 | NTNCWS | Baltimore | 460 | Baltimore County |
| Prime Time Childrens Center | MD1040093 | NTNCWS | Owings | 90 | Calvert County |
| Prime Time Youth Activity Center | MD1040091 | NTNCWS | Owings | 90 | Calvert County |
| Primrose School | MD1020144 | NTNCWS | Gambrills | 197 | Anne Arundel County |
| Princess Royale Hotel Distribution | MD1230082 | NTNCWS | Ocean City | 80 | Worcester County |
| Prospect Bay | MD0170009 | CWS | Stevensville | 913 | Queen Anne's County |
| Prospect Mill Elementary | MD1120032 | NTNCWS | Bel Air | 691 | Harford County |
| Providence School | MD1070051 | NTNCWS | Perryville | 380 | Cecil County |
| Purnell Armory - Md Army National Guard | MD1030077 | NTNCWS | Glen Arm | 25 | Baltimore County |
| Queen Annes County Dpw Office | MD1170014 | NTNCWS | Stevensville | 30 | Queen Anne's County |
| Queen Annes County Parks & Recreation | MD1170016 | NTNCWS | Stevensville | 300 | Queen Anne's County |
| Queens Castle Mobile Home Park | MD0120213 | CWS | Darlington | 60 | Harford County |
| R & R Estates | MD0120210 | CWS | Darlington | 96 | Harford County |
| Reckley Spring Community Water | MD0010031 | CWS | East Greenville | 78 | Allegany County |
| Recovery Center Of America | MD1070065 | NTNCWS | Earleville | 30 | Cecil County |
| Red Hill Water Company, Inc. | MD0080040 | CWS | Waldorf | 200 | Charles County |
| Redeemer Classical Christian School | MD1030092 | NTNCWS | Kingsville | 346 | Baltimore County |
| Redgate Properties, Llc | MD1180074 | NTNCWS | Los Angeles | 26 | St. Mary's County |
| Reeb Millwork (Delmarva Sash & Door)1315 | MD1170033 | NTNCWS | Bethlehem | 159 | Queen Anne's County |
| Reeb Millwork Of Maryland, Inc. 1302 | MD1170005 | NTNCWS | Bethlehem | 70 | Queen Anne's County |
| Regency Manor Mobile Home Park | MD0040202 | CWS | Lothian | 224 | Calvert County |
| Regency Park Assisted Living Residence | MD1020035 | CWS | Gambrills | 85 | Anne Arundel County |
| Reisterstown Lumber Company | MD1030082 | NTNCWS | Reisterstown | 75 | Baltimore County |
| Reliance Mobile Home Park | MD0090221 | CWS | 200 | Dorchester County | |
| Reservoir Trailer Park | MD0060213 | CWS | Finksburg | 79 | Carroll County |
| Rhodes Point South Waterworks | MD0190009 | CWS | Tylerton | 100 | Somerset County |
| Riddle Farm | MD0230019 | CWS | Berlin | 500 | Worcester County |
| Ridge Elementary School | MD1180044 | NTNCWS | Loveville | 300 | St. Mary's County |
| Rigidply Rafters | MD1110021 | NTNCWS | Oakland | 65 | Garrett County |
| Rio Vista Plaza Mobile Home Park | MD0020218 | CWS | Baltimore | 150 | Anne Arundel County |
| Rising Sun Elementary | MD1070027 | NTNCWS | Elkton | 726 | Cecil County |
| Rising Sun High School | MD1070044 | NTNCWS | Elkton | 1,102 | Cecil County |
| Ritcheys Totlot, Llc | MD1210025 | NTNCWS | Hagerstown | 60 | Washington County |
| Riverside Complex | MD0170018 | CWS | Stevensville | 60 | Queen Anne's County |
| Riverview Mobile Home Park | MD0230224 | CWS | Bishopville | 150 | Worcester County |
| Rockbridge Academy | MD1020017 | NTNCWS | Crownsville | 425 | Anne Arundel County |
| Rockbrook Village Mobile Home Park | MD0060214 | CWS | Ellicott City | 150 | Carroll County |
| Rocky Gap Mobile Home Park | MD0010215 | CWS | Rawlings | 30 | Allegany County |
| Rocky Gap State Park | MD1011051 | NTNCWS | Flintstone | 200 | Allegany County |
| Rolling Acres | MD0180017 | CWS | California | 699 | St. Mary's County |
| Rose Haven | MD0020030 | CWS | Millersville | 235 | Anne Arundel County |
| Rosemont Distribution System | MD0100045 | CWS | Frederick | 237 | Frederick County |
| Route 40 Elementary School | MD1110009 | NTNCWS | Oakland | 190 | Garrett County |
| Route 7 Distribution System | MD0070032 | CWS | Newark | 100 | Cecil County |
| Royal Farms #88 | MD1121053 | NTNCWS | Baltimore | 75 | Harford County |
| Runnymede Elementary | MD1060058 | NTNCWS | Westminster | 700 | Carroll County |
| Ruppert Landscape | MD1150050 | NTNCWS | Laytonsville | 119 | Montgomery County |
| Sabillasville Environmental School | MD1100030 | NTNCWS | Sabillasville | 230 | Frederick County |
| Saint James School | MD0210209 | CWS | Hagerstown | 200 | Washington County |
| Saint Marys College | MD0180013 | CWS | Millersville | 2,200 | St. Mary's County |
| Salem Lutheran Children'S Center | MD1120033 | NTNCWS | Jarrettsville | 210 | Harford County |
| Salisbury Christian School | MD1220007 | NTNCWS | Salisbury | 750 | Wicomico County |
| Salisbury School | MD1220025 | NTNCWS | Salisbury | 220 | Wicomico County |
| Salt Life, Llc | MD0230204 | NTNCWS | Ocean City | 29 | Worcester County |
| Sam Hill Estates | MD0100040 | CWS | Frederick | 1,036 | Frederick County |
| San Mar | MD0210214 | NTNCWS | Boonsboro | 42 | Washington County |
| Sandy Cove Ministries Church | MD1070053 | NTNCWS | Northeast | 35 | Cecil County |
| Sandy Hook | MD0210019 | CWS | Sharpsburg | 220 | Washington County |
| Sandy Point State Park Marina | MD1021439 | NTNCWS | Millersville | 188 | Anne Arundel County |
| Sandymount Elementary | MD1060037 | NTNCWS | Westminster | 650 | Carroll County |
| Sandymount United Methodist Church | MD1061086 | NTNCWS | Finksburg | 111 | Carroll County |
| Saubels Market | MD1121046 | NTNCWS | Whiteford | 55 | Harford County |
| Scientists Cliffs | MD0040014 | CWS | Port Republic | 1,425 | Calvert County |
| Sea Watch Condominium Distribution Syst | MD1230087 | NTNCWS | Ocean City | 32 | Worcester County |
| Seaside Christian Academy | MD1230072 | NTNCWS | Ocean City | 60 | Worcester County |
| Seneca Academy & The Circle School | MD1150045 | NTNCWS | Darnestown | 60 | Montgomery County |
| Seventh District Elementary | MD1030030 | NTNCWS | Baltimore | 437 | Baltimore County |
| Severna Park Childrens Centre | MD1020071 | NTNCWS | Pasadena | 99 | Anne Arundel County |
| Shady Side Elementary | MD1020025 | NTNCWS | Pasadena | 517 | Anne Arundel County |
| Shelter Cove Yacht And Marina Inc | MD1071238 | NTNCWS | North East | 59 | Cecil County |
| Sherwood Forest Water Company | MD0020035 | CWS | Sherwood Forest | 1,200 | Anne Arundel County |
| Sherwood Forest/Forest View Village Mhp | MD0070250 | CWS | Elkton | 293 | Cecil County |
| Ship'S Point Business Park Llc | MD1040099 | NTNCWS | Lusby | 44 | Calvert County |
| Shoemaker Limited Partnership | MD1030104 | NTNCWS | Baltimore | 68 | Baltimore County |
| Shoppes At Apple Greene | MD1040076 | NTNCWS | Pittsburgh | 2,818 | Calvert County |
| Shores Of Calvert | MD0040015 | CWS | Prince Frederick | 361 | Calvert County |
| Silver Oak Academy | MD0060018 | NTNCWS | Keymar | 44 | Carroll County |
| Sleepy Hollow Daycare | MD1040074 | NTNCWS | Huntingtown | 65 | Calvert County |
| Smithsonian Enviro. Research Center | MD1020089 | NTNCWS | Edgewater | 323 | Anne Arundel County |
| Sneades Hardware (Owings) - Davlyn Llc | MD1041134 | NTNCWS | Huntingtown | 40 | Calvert County |
| Snow Hill Child Development Center | MD1230021 | NTNCWS | Stockton | 46 | Worcester County |
| Snow Hill Christian Nursery School | MD1230077 | NTNCWS | Snow Hill | 80 | Worcester County |
| Sod Run Wastewater Treatment Plant | MD1120047 | NTNCWS | Bel Air | 45 | Harford County |
| Solomons Recreation Center (Navfac-Wash) | MD0040023 | NTNCWS | Patuxent River | 1,200 | Calvert County |
| Somerset Co Health Dept | MD1190022 | NTNCWS | Princess Anne | 35 | Somerset County |
| Somerset Community Services | MD1190019 | NTNCWS | Marion | 105 | Somerset County |
| Somerset County Board Of Education | MD1190021 | NTNCWS | Westover | 215 | Somerset County |
| Somerset County Intermediate School | MD1190026 | NTNCWS | Westover | 400 | Somerset County |
| Somerset County Technical High School | MD1190027 | NTNCWS | Westover | 400 | Somerset County |
| South Carroll High School | MD1060040 | NTNCWS | Westminster | 1,250 | Carroll County |
| South Dorchester School | MD1090014 | NTNCWS | Cambridge | 207 | Dorchester County |
| South Shore Elementary | MD1020027 | NTNCWS | Pasadena | 305 | Anne Arundel County |
| Southern High School | MD1020028 | NTNCWS | Pasadena | 1,400 | Anne Arundel County |
| Southern Maryland Christian Academy | MD1080005 | NTNCWS | La Plata | 445 | Charles County |
| Southern Md Electric Cooperative | MD1080041 | NTNCWS | Hughesville | 90 | Charles County |
| Southern Middle School | MD1020029 | NTNCWS | Pasadena | 1,150 | Anne Arundel County |
| Southern Middle School | MD1040038 | NTNCWS | Prince Frederick | 745 | Calvert County |
| Southern Region Allegany Distrib. System | MD0010045 | CWS | Cumberland | 865 | Allegany County |
| Southgate | MD0180048 | CWS | California | 188 | St. Mary's County |
| Southview Wise | MD0080041 | CWS | Newburg | 61 | Charles County |
| Sparks Elementary School | MD1030084 | NTNCWS | Baltimore | 537 | Baltimore County |
| Spring Ridge Middle School | MD1180049 | NTNCWS | Loveville | 1,075 | St. Mary's County |
| Spring Valley | MD0080043 | CWS | La Plata | 91 | Charles County |
| Springfield Hospital Distribution | MD0060010 | CWS | Sykesville | 1,500 | Carroll County |
| St Johns Lutheran Church And School | MD1031358 | NTNCWS | 140 | Baltimore County | |
| St Michaels Catholic Church | MD1131114 | NTNCWS | Mount Airy | 697 | Howard County |
| St Paul Um Church | MD1041137 | NTNCWS | Lusby | 134 | Calvert County |
| St Pauls Lutheran Church And School | MD1031312 | NTNCWS | Joppa | 150 | Baltimore County |
| St. Andrews School | MD1020030 | NTNCWS | Edgewater | 450 | Anne Arundel County |
| St. Clements Shores | MD0180012 | CWS | California | 620 | St. Mary's County |
| St. James Academy | MD1030034 | NTNCWS | Monkton | 355 | Baltimore County |
| St. John The Evangelist Catholic School | MD1030067 | NTNCWS | Hydes | 730 | Baltimore County |
| St. Leonard | MD0040013 | CWS | Prince Frederick | 350 | Calvert County |
| St. Martins By The Bay | MD0230008 | CWS | Berlin | 120 | Worcester County |
| St. Marys Bryantown Catholic School | MD1080026 | NTNCWS | Bryantown | 791 | Charles County |
| St. Michael'S School | MD1180053 | NTNCWS | 180 | St. Mary's County | |
| St. Peters School | MD1080027 | NTNCWS | Waldorf | 493 | Charles County |
| St. Stephen School | MD1030038 | NTNCWS | Kingsville | 350 | Baltimore County |
| Stag Hampstead | MD1060072 | NTNCWS | Plymouth Meeting | 140 | Carroll County |
| Steeplechase Waterworks | MD0220010 | CWS | Salisbury | 395 | Wicomico County |
| Stella Maris | MD0030212 | CWS | Timonium | 873 | Baltimore County |
| Stethem Ed Cntr & James Craik Elementary | MD1080002 | NTNCWS | La Plata | 801 | Charles County |
| Stevenson Crossing Llc | MD1030095 | NTNCWS | Stevenson | 54 | Baltimore County |
| Stevenson University | MD1030042 | NTNCWS | Stevenson | 1,313 | Baltimore County |
| Stevenson Village Shopping Center | MD1031267 | NTNCWS | Stevenson | 50 | Baltimore County |
| Stockton Head Start | MD1230012 | NTNCWS | Stockton | 68 | Worcester County |
| Stonewall Day Care Center #2 | MD1120034 | NTNCWS | Fallston | 155 | Harford County |
| Stoney Chase/ Rock Creek M.H.P.S | MD0070233 | CWS | Elkton | 396 | Cecil County |
| Student Support Services Center | MD1020088 | NTNCWS | Pasadena | 36 | Anne Arundel County |
| Suburban Hospital | MD1150055 | NTNCWS | Naperville | 1,900 | Montgomery County |
| Sullivans Mobile Home Park Community | MD0060215 | CWS | Ellicott City | 70 | Carroll County |
| Summerhill Mobile Home Park | MD0020221 | CWS | Glen Arm | 350 | Anne Arundel County |
| Summit/Highlands | MD0040026 | CWS | Prince Frederick | 1,108 | Calvert County |
| Sun Valley Assisted Living 1 | MD0060231 | NTNCWS | Sykesville | 34 | Carroll County |
| Sun Valley Assisted Living 2 - Meadows | MD0060232 | NTNCWS | Sykesville | 28 | Carroll County |
| Sunderland Commercial Center | MD1040082 | NTNCWS | 70 | Calvert County | |
| Sunderland Elementary School | MD1040041 | NTNCWS | Prince Frederick | 481 | Calvert County |
| Sunmed Growers | MD1070067 | NTNCWS | Warwick | 145 | Cecil County |
| Sunnybrook | MD0030011 | CWS | Baltimore | 416 | Baltimore County |
| Sunset Bus. Park/ Meyers Siding Condo | MD1230036 | NTNCWS | Ocean City | 85 | Worcester County |
| Sunset Lakes Llc | MD0230220 | CWS | Berlin | 48 | Worcester County |
| Sunshine Child Development Center | MD1061276 | NTNCWS | Lineboro | 50 | Carroll County |
| Swan Harbour Dell Mobile Home Park | MD0120215 | CWS | Havre De Grace | 500 | Harford County |
| Swan Meadow Elementary School | MD1110011 | NTNCWS | Oakland | 60 | Garrett County |
| Swan Point | MD0080046 | CWS | La Plata | 945 | Charles County |
| Swann Haven Mobile Home Park | MD0200202 | CWS | Chester | 44 | Talbot County |
| Sysco Eastern Maryland | MD1190024 | NTNCWS | Pocomoke | 250 | Somerset County |
| T.C. Martin Elementary School | MD1080030 | NTNCWS | La Plata | 609 | Charles County |
| T.E.C. Building Partnership | MD1100011 | NTNCWS | Ijamsville | 25 | Frederick County |
| Take-It-Easy Campground Retreat | MD1180062 | NTNCWS | Callaway | 100 | St. Mary's County |
| Talbot Co. Country Club | MD1201046 | NTNCWS | Easton | 70 | Talbot County |
| Tall Oaks Vocational School | MD1160031 | NTNCWS | Upper Marlboro | 135 | Prince George's County |
| Tapestry North | MD0040205 | CWS | Prince Frederick | 60 | Calvert County |
| Tara Subdivision | MD0040034 | CWS | Prince Frederick | 68 | Calvert County |
| Taylors Mobile Home Park | MD0050217 | CWS | Greensboro | 27 | Caroline County |
| Taylorsville Mhc, Llc | MD0060216 | CWS | Ellicott City | 38 | Carroll County |
| Tebbston On Magothy | MD0020059 | CWS | Westminster | 52 | Anne Arundel County |
| Temple Isaiah Synagogue And Preschool | MD1130037 | NTNCWS | Fulton | 203 | Howard County |
| Ten Oaks Plaza | MD1130031 | NTNCWS | Glenelg | 50 | Howard County |
| Tender Years Of Deale | MD1020121 | NTNCWS | Deale | 72 | Anne Arundel County |
| Tenthouse Creek Community - Acds | MD0020063 | CWS | Annapolis | 23 | Anne Arundel County |
| The Barnesville School | MD1150001 | NTNCWS | Barnesville | 440 | Montgomery County |
| The Calverton School | MD1040022 | CWS | Huntingtown | 461 | Calvert County |
| The Center For Life Enrichment | MD1180052 | NTNCWS | Hollywood | 70 | St. Mary's County |
| The Childs Nurturing Center 1-Finksburg | MD1060047 | NTNCWS | Finksburg | 99 | Carroll County |
| The Council Of Renard Court Condominium | MD1020146 | NTNCWS | Annapolis | 108 | Anne Arundel County |
| The Highlands School | MD1120062 | NTNCWS | Bel Air | 125 | Harford County |
| The Jemicy School (Lower School) | MD1030020 | NTNCWS | Owings Mills | 240 | Baltimore County |
| The Neighborhoods At St. Elizabeth | MD0300004 | CWS | Baltimore | 162 | Baltimore city |
| The Ranch, Inc. | MD1101233 | NTNCWS | Buckeystown | 50 | Frederick County |
| The Shoppes At Dunkirk Llc -Country Plz | MD1041152 | NTNCWS | Clinton | 60 | Calvert County |
| The Summit School | MD1020103 | NTNCWS | Edgewater | 145 | Anne Arundel County |
| The Tidewater School | MD1040067 | NTNCWS | Huntingtown | 65 | Calvert County |
| Thunderbird Apartments | MD1080029 | CWS | Waldorf | 40 | Charles County |
| Thunderbird Motel | MD0080069 | CWS | Newburg | 60 | Charles County |
| Tidewater Direct Llc | MD1170022 | NTNCWS | Centreville | 150 | Queen Anne's County |
| Tilghman Elementary School | MD1200008 | NTNCWS | Easton | 122 | Talbot County |
| Timber Grove Mhp | MD0070245 | CWS | Street | 76 | Cecil County |
| Tlc Preschool And Daycare | MD1120065 | NTNCWS | Jarrettsville | 38 | Harford County |
| Todd Village Mobile Home Park | MD0060217 | CWS | Finksburg | 180 | Carroll County |
| Tommy Tucker Nursery 2 Daycare | MD1220027 | NTNCWS | Parsonsburg | 30 | Wicomico County |
| Tower Business Center | MD1061307 | NTNCWS | Cockeysville | 38 | Carroll County |
| Tower Court Mobile Home Park | MD0050216 | CWS | Denton | 40 | Caroline County |
| Town & Country Mobile Home Park | MD0070235 | CWS | North East | 950 | Cecil County |
| Town Of Accident | MD0110001 | CWS | Accident | 300 | Garrett County |
| Town Of Betterton | MD0140001 | CWS | Betterton | 481 | Kent County |
| Town Of Cecilton | MD0070004 | CWS | Cecilton | 477 | Cecil County |
| Town Of Charlestown | MD0070029 | CWS | Willards | 3,791 | Cecil County |
| Town Of Chesapeake City [Formerly South] | MD0070006 | CWS | Chesapeake City | 673 | Cecil County |
| Town Of Clear Spring | MD0210005 | CWS | Williamsport | 455 | Washington County |
| Town Of Darlington | MD0120009 | CWS | Millersville | 250 | Harford County |
| Town Of Deer Park | MD0110021 | CWS | Oakland | 272 | Garrett County |
| Town Of East New Market | MD0090004 | CWS | East New Market | 400 | Dorchester County |
| Town Of Emmitsburg | MD0100010 | CWS | Emmitsburg | 2,921 | Frederick County |
| Town Of Federalsburg | MD0050002 | CWS | Federalsburg | 2,450 | Caroline County |
| Town Of Friendsville | MD0110004 | CWS | Oakland | 622 | Garrett County |
| Town Of Funkstown Distribution System | MD0210008 | CWS | Funkstown | 1,300 | Washington County |
| Town Of Galena | MD0140004 | CWS | Chestertown | 560 | Kent County |
| Town Of Grantsville | MD0110005 | CWS | Grantsville | 885 | Garrett County |
| Town Of Greensboro | MD0050003 | CWS | Greensboro | 1,878 | Caroline County |
| Town Of Hebron | MD0220002 | CWS | Hebron | 1,022 | Wicomico County |
| Town Of Henderson | MD0050008 | CWS | Port Deposit | 156 | Caroline County |
| Town Of Hurlock | MD0090005 | CWS | Hurlock | 2,150 | Dorchester County |
| Town Of Kitzmiller | MD0110013 | CWS | Mountain Lake Park | 370 | Garrett County |
| Town Of Leonardtown | MD0180006 | CWS | Leonardtown | 5,000 | St. Mary's County |
| Town Of Luke | MD0010019 | CWS | Luke | 68 | Allegany County |
| Town Of Mountain Lake Park | MD0110007 | CWS | Oakland | 3,000 | Garrett County |
| Town Of Myersville | MD0100020 | CWS | Myersville | 2,000 | Frederick County |
| Town Of New Windsor | MD0060008 | CWS | New Windsor | 1,732 | Carroll County |
| Town Of North Beach | MD0040030 | CWS | North Beach | 3,000 | Calvert County |
| Town Of Oakland | MD0110008 | CWS | Oakland | 1,850 | Garrett County |
| Town Of Oxford | MD0200005 | CWS | Oxford | 726 | Talbot County |
| Town Of Pittsville | MD0220009 | CWS | Pittsville | 1,500 | Wicomico County |
| Town Of Preston | MD0050005 | CWS | Preston | 750 | Caroline County |
| Town Of Queenstown | MD0170003 | CWS | Queenstown | 705 | Queen Anne's County |
| Town Of Ridgely | MD0050006 | CWS | Ridgely | 1,600 | Caroline County |
| Town Of Rising Sun | MD0070021 | CWS | Elkton | 2,200 | Cecil County |
| Town Of Rock Hall | MD0140006 | CWS | Rock Hall | 1,750 | Kent County |
| Town Of Secretary | MD0090007 | CWS | Secretary | 535 | Dorchester County |
| Town Of Sharpsburg | MD0210017 | CWS | Williamsport | 1,360 | Washington County |
| Town Of Sharptown | MD0220005 | CWS | Sharptown | 625 | Wicomico County |
| Town Of Smithsburg Distribution System | MD0210018 | CWS | Smithsburg | 2,500 | Washington County |
| Town Of Snow Hill | MD0230007 | CWS | Snow Hill | 2,409 | Worcester County |
| Town Of St. Michaels | MD0200006 | CWS | St Michaels | 2,650 | Talbot County |
| Town Of Sudlersville | MD0170024 | CWS | Stevensville | 497 | Queen Anne's County |
| Town Of Trappe | MD0200007 | CWS | 1,200 | Talbot County | |
| Town Of Union Bridge | MD0060013 | CWS | Union Bridge | 997 | Carroll County |
| Town Of Vienna | MD0090008 | CWS | Vienna | 573 | Dorchester County |
| Town Of Westernport | MD0010033 | CWS | Westernport | 2,200 | Allegany County |
| Town Of Willards | MD0220007 | CWS | 1,021 | Wicomico County | |
| Town Of Williamsport Distribution System | MD0210021 | CWS | 2,400 | Washington County | |
| Town Of Woodsboro | MD0100027 | CWS | Woodsboro | 846 | Frederick County |
| Traceys Landing Elementary | MD1020031 | NTNCWS | Pasadena | 400 | Anne Arundel County |
| Tranquility At Fredericktowne | MD0100214 | CWS | Frederick | 105 | Frederick County |
| Tri-Gas And Oil Co., Inc. | MD1050011 | NTNCWS | Federalsburg | 90 | Caroline County |
| Tri-State Christian Academy | MD1070014 | NTNCWS | Elkton | 350 | Cecil County |
| Triadelphia Ridge Elementary | MD1130027 | NTNCWS | Ellicott City | 507 | Howard County |
| Trimac Water Company - Forest Park | MD0080013 | CWS | Waldorf | 139 | Charles County |
| Trinity Episcopal Church | MD1030066 | NTNCWS | Glen Arm | 75 | Baltimore County |
| Truth Bible Church | MD1040095 | NTNCWS | Prince Frederick | 230 | Calvert County |
| Turkey Hill Water Company | MD0080048 | CWS | La Plata | 150 | Charles County |
| Twin Arch Mobile Home Park | MD0060218 | CWS | Stevensville | 50 | Carroll County |
| Tylerton Waterwork Cooperative | MD0190011 | CWS | Tylerton | 100 | Somerset County |
| U.M. Central Md Research & Education Ctr | MD1130024 | NTNCWS | Ellicott City | 36 | Howard County |
| U.S.D.A. Agricultural Research Center | MD0160001 | NTNCWS | Beltsville | 1,400 | Prince George's County |
| Um Capital Region Medical Center | MD1160050 | NTNCWS | Largo | 1,309 | Prince George's County |
| Um Capital Region Surgery Center | MD1160051 | NTNCWS | Largo | 175 | Prince George's County |
| Um Laurel Fmf Distribution System | MD1160052 | NTNCWS | Largo | 110 | Prince George's County |
| Um Saint Joseph Medical Center | MD1030103 | NTNCWS | Towson | 1,515 | Baltimore County |
| Umd Rehabilitation And Orthopedic Inst. | MD1300011 | NTNCWS | Baltimore | 860 | Baltimore city |
| Ummc - Midtown Campus Armory Building | MD1300009 | NTNCWS | Baltimore | 500 | Baltimore city |
| University Of Maryland Medical Center | MD1300003 | NTNCWS | Baltimore | 854 | Baltimore city |
| Victorious Kids / Master'S Child Church | MD1080025 | NTNCWS | Indian Head | 45 | Charles County |
| Villages At Leonardtown | MD0180052 | CWS | California | 239 | St. Mary's County |
| Villas At Cattail Creek | MD0130005 | CWS | Reistertown | 170 | Howard County |
| Vision Quest Morning Star Youth Academy | MD1090009 | NTNCWS | Woolford | 84 | Dorchester County |
| W.L. Gore At Fair Hill | MD1070047 | NTNCWS | Oxford | 200 | Cecil County |
| Wakefield Valley | MD0060017 | CWS | Westminster | 2,436 | Carroll County |
| Walnut Creek | MD0040035 | CWS | Prince Frederick | 158 | Calvert County |
| Walstons Mobile Home Park | MD0220217 | CWS | Salisbury | 165 | Wicomico County |
| Warwick Manor Behavioral Health | MD1090008 | NTNCWS | Secretary | 52 | Dorchester County |
| Warwick Mushroom Farm | MD1070062 | NTNCWS | Kennett Square | 265 | Cecil County |
| Waterside | MD0100029 | CWS | Frederick | 1,509 | Frederick County |
| Waysons Mobile Court | MD0020223 | CWS | Farmington Hills | 540 | Anne Arundel County |
| Webster Field Annex, St Inigoes (Navfac) | MD0180024 | NTNCWS | Patuxent River | 1,200 | St. Mary's County |
| Wee Care Best Day Care Center | MD1060065 | NTNCWS | Finksburg | 158 | Carroll County |
| Wee Lad & Lassie Early Learning | MD1020077 | NTNCWS | Arnold | 40 | Anne Arundel County |
| West Cecil Health Center | MD1070072 | NTNCWS | Conowingo | 125 | Cecil County |
| West Friendship Elementary School | MD1130008 | NTNCWS | Ellicott City | 350 | Howard County |
| West Friendship Shopping Center | MD1130015 | NTNCWS | Baltimore | 47 | Howard County |
| West Nottingham Academy | MD0070204 | CWS | Colora | 250 | Cecil County |
| West Ocean City Business Park | MD1230071 | NTNCWS | Ocean City | 25 | Worcester County |
| West White Plains | MD0080051 | CWS | Waldorf | 50 | Charles County |
| Western Shores | MD0040016 | CWS | Waldorf | 200 | Calvert County |
| Westside Mobile Home Park | MD0220220 | CWS | Delmar | 300 | Wicomico County |
| Westside Primary School | MD1220029 | NTNCWS | Salisbury | 260 | Wicomico County |
| Whispering Pines Mobile Home Park | MD0070213 | CWS | New Castle | 325 | Cecil County |
| White Marlin Mall & Outlets Ocean City | MD1230033 | NTNCWS | Owings Mills | 150 | Worcester County |
| White Marsh Elementary School | MD1180056 | NTNCWS | Loveville | 325 | St. Mary's County |
| White Oak Mobile Home Park | MD0110225 | CWS | Swanton | 32 | Garrett County |
| White Plains 1 Mhp/Smittys | MD0080207 | CWS | Jessup | 100 | Charles County |
| White Rock | MD0100026 | CWS | Frederick | 256 | Frederick County |
| White Sands | MD0040017 | CWS | Prince Frederick | 82 | Calvert County |
| Whitley Park Condominiums | MD0150101 | CWS | 256 | Montgomery County | |
| Wicomico Day School | MD1220040 | NTNCWS | Salisbury | 300 | Wicomico County |
| Wicomico Shores | MD0180018 | CWS | California | 1,262 | St. Mary's County |
| Wild Goose Crest Subdivision | MD0180056 | CWS | California | 65 | St. Mary's County |
| Wilderness Run | MD0180036 | CWS | California | 511 | St. Mary's County |
| Williams Gas Pipeline Station #190 | MD1130017 | NTNCWS | Ellicott City | 30 | Howard County |
| Williams Mobile Home Park | MD0070238 | CWS | Oxford | 87 | Cecil County |
| Williams Mobile Home Park | MD0120207 | CWS | Severna Park | 35 | Harford County |
| Winfield Elementary | MD1060050 | NTNCWS | Westminster | 700 | Carroll County |
| Wolfsville Elementary | MD1100034 | NTNCWS | Frederick | 177 | Frederick County |
| Wonder Years - Broadwater Creek Academy | MD1020097 | NTNCWS | Edgewater | 68 | Anne Arundel County |
| Wonder Years - London Towne Academy | MD1020139 | NTNCWS | Edgewater | 57 | Anne Arundel County |
| Woodbine Village Mobile Home Park | MD0060203 | CWS | Potomac | 150 | Carroll County |
| Woodland Beach Community Assoc. | MD1021498 | CWS | Severn | 26 | Anne Arundel County |
| Woodland Trailer Park | MD0210205 | CWS | Boonsboro | 65 | Washington County |
| Woodlawn Mobile Home Park - New | MD0070239 | CWS | Port Deposit | 134 | Cecil County |
| Woodlawn Mobile Home Park - Old | MD0070241 | CWS | Port Deposit | 50 | Cecil County |
| Worcester Technical Hs & Co Boe Office | MD1230024 | NTNCWS | Newark | 450 | Worcester County |
| Worton | MD0140007 | CWS | Chestertown | 955 | Kent County |
| Wssc-Western Branch | MD1160035 | NTNCWS | Upper Marlboro | 32 | Prince George's County |
| Wylder Hotel Tilghman Island | MD1201021 | NTNCWS | Tilghman Island | 80 | Talbot County |
| Yellow Springs Elementary | MD1100036 | NTNCWS | Frederick | 486 | Frederick County |
| Yogi Bears Jellystone Park | MD1211068 | NTNCWS | Grand Rapids | 541 | Washington County |
| Youths Benefit Elementary School | MD1120037 | NTNCWS | Bel Air | 1,175 | Harford County |