772 community and non-transient non-community water systems are listed for Massachusetts in EPA SDWIS. 263 were sampled under UCMR 5; 144 of those had at least one PFAS result at or above the reporting level, and 109 had a highest single result at or above a 2024 EPA limit (PFOA or PFOS 4 ppt, or Hazard Index 1).
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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 (263)
| System | PWSID | City | Population | Highest PFOA (ppt) | Highest PFOS (ppt) | Highest HI | Highest single result |
|---|---|---|---|---|---|---|---|
| Abington/Rockland Joint Wtr. Works | MA4001000 | Rockland | 33,387 | 12 | 7 | 0.402 | PFOA ≥ 3 × its limit |
| Acton Water Supply District | MA2002000 | Acton | 21,285 | 13.4 | 4.9 | 0.32 | PFOA ≥ 3 × its limit |
| Acushnet Water Department | MA4003000 | Acushnet | 8,430 | <MRL | <MRL | 0 | No PFAS detected |
| Adams Fire District | MA1004000 | Adams | 7,945 | <MRL | <MRL | 0 | No PFAS detected |
| Agawam Water Department | MA1005000 | Agawam | 28,692 | <MRL | <MRL | 0 | No PFAS detected |
| Amesbury Dpw Water Div. | MA3007000 | Amesbury | 17,366 | <MRL | <MRL | 0 | No PFAS detected |
| Amherst Dpw Water Division | MA1008000 | Amherst | 39,263 | <MRL | <MRL | 0 | No PFAS detected |
| Andover Water Dept | MA3009000 | Andover | 36,569 | <MRL | <MRL | 0 | Other PFAS detected |
| Aquarion Water Company Oxford | MA2226000 | Millbury | 7,384 | <MRL | <MRL | 0 | Other PFAS detected |
| Aquarion Water Company, Millbury | MA2186000 | Millbury | 11,368 | 15.8 | 6.2 | 0.002 | PFOA ≥ 3 × its limit |
| Aquarion Water Company, Pinehills | MA4239055 | Millbury | 9,478 | <MRL | <MRL | 0 | Other PFAS detected |
| Arlington Water Dept. (Mwra) | MA3010000 | Arlington | 46,308 | <MRL | <MRL | 0 | No PFAS detected |
| Ash/Win Joint Water Authority | MA2011004 | Ashburnham | 11,394 | <MRL | <MRL | 0 | No PFAS detected |
| Ashburnham Water Department | MA2011000 | Ashburnham | 3,680 | <MRL | <MRL | 0 | No PFAS detected |
| Ashland Water And Sewer Dept. | MA3014000 | Ashland | 18,832 | <MRL | <MRL | 0 | Other PFAS detected |
| Athol Dpw Water Division | MA1015000 | Athol | 10,587 | <MRL | <MRL | 0 | No PFAS detected |
| Attleboro Water Dept | MA4016000 | Attleboro | 46,461 | 6.6 | 12 | 0.38 | PFOS ≥ 3 × its limit |
| Auburn Water District | MA2017000 | Auburn | 12,255 | 5.7 | 4.7 | 0 | PFOA 1–3 × its limit |
| Ayer Dpw Water Division | MA2019000 | Ayer | 8,479 | <MRL | <MRL | 0 | Other PFAS detected |
| Barnstable Fire District | MA4020000 | Barnstable | 5,400 | 4.4 | 7.1 | 0.36 | PFOS 1–3 × its limit |
| Barre Water Department | MA2021000 | Barre | 2,610 | <MRL | <MRL | 0 | No PFAS detected |
| Bedford Water Dept. | MA3023000 | Bedford | 14,955 | <MRL | <MRL | 0 | No PFAS detected |
| Belchertown Water District | MA1024000 | Belchertown | 3,253 | <MRL | <MRL | 0 | No PFAS detected |
| Bellingham Dpw Water Sewer Division | MA2025000 | Bellingham | 16,556 | 4.3 | 5 | 0.002 | PFOS 1–3 × its limit |
| Belmont Water Dept. (Mwra) | MA3026000 | Belmont | 27,442 | <MRL | <MRL | 0 | No PFAS detected |
| Beverly Water Dept | MA3030000 | Beverly | 47,461 | <MRL | <MRL | 0 | Other PFAS detected |
| Billerica Water Works | MA3031000 | Billerica | 42,119 | 5.5 | <MRL | 0.002 | PFOA 1–3 × its limit |
| Blackstone Water Department | MA2032000 | Blackstone | 9,463 | 5.7 | <MRL | 0 | PFOA 1–3 × its limit |
| Boston Water And Sewer Commission (Mwra) | MA3035000 | Boston | 675,647 | <MRL | <MRL | 0 | No PFAS detected |
| Bourne Water District | MA4036000 | Pocasset | 22,500 | <MRL | 4.8 | 0.76 | PFOS 1–3 × its limit |
| Boylston Water District | MA2039000 | Boylston | 3,343 | 6 | <MRL | 0.002 | PFOA 1–3 × its limit |
| Braintree Water And Sewer Dept. | MA4040000 | Braintree | 39,143 | 5.3 | 8.5 | 0.002 | PFOS 1–3 × its limit |
| Brewster Water Department | MA4041000 | Brewster | 35,000 | <MRL | <MRL | 0 | No PFAS detected |
| Bridgewater Water Department | MA4042000 | Bridgewater | 28,633 | 9 | 7 | 0.403 | PFOA 1–3 × its limit |
| Brockton Water Department | MA4044000 | Brockton | 105,788 | <MRL | <MRL | 0 | No PFAS detected |
| Brookline Water And Sewer Division | MA3046000 | Brookline | 63,191 | <MRL | <MRL | 0 | No PFAS detected |
| Burlington Water Dept | MA3048000 | Burlington | 25,864 | <MRL | <MRL | 0 | Other PFAS detected |
| Buzzards Bay Water District | MA4036001 | Bourne | 7,700 | <MRL | <MRL | 0 | No PFAS detected |
| Cambridge Water Department | MA3049000 | Cambridge | 118,214 | 4.8 | <MRL | 0 | PFOA 1–3 × its limit |
| Canton Water Dept | MA4050000 | Canton | 22,766 | 5 | <MRL | 0 | PFOA 1–3 × its limit |
| Centerville Osterville Marstons Mills Wd | MA4020002 | Osterville | 50,000 | 4.9 | <MRL | 0.311 | PFOA 1–3 × its limit |
| Chatham Water Department | MA4055000 | Chatham | 30,000 | <MRL | <MRL | 0 | No PFAS detected |
| Chelmsford Water District | MA3056000 | Chelmsford | 28,750 | 8.9 | 7.2 | 0.002 | PFOA 1–3 × its limit |
| Chelsea Water Dept. (Mwra) | MA3057000 | Chelsea | 40,787 | <MRL | <MRL | 0 | No PFAS detected |
| Cherry Valley/ Rochdale Water District | MA2151001 | Rochdale | 3,696 | <MRL | <MRL | 0 | Other PFAS detected |
| Chicopee Water Dept (Mwra) | MA1061000 | Chicopee | 55,560 | <MRL | <MRL | 0 | No PFAS detected |
| City Of New Bedford Dpi | MA4201000 | New Bedford | 101,079 | <MRL | <MRL | 0 | Other PFAS detected |
| Clinton Water Dept | MA2064000 | Clinton | 15,428 | <MRL | <MRL | 0 | No PFAS detected |
| Cohasset Water Dept | MA4065000 | Cohasset | 7,555 | 6.7 | 4.5 | 0 | PFOA 1–3 × its limit |
| Concord Water Dept | MA3067000 | Concord | 18,788 | 6 | <MRL | 0.005 | PFOA 1–3 × its limit |
| Cotuit Fire District Water Department | MA4020003 | Cotuit | 4,938 | <MRL | <MRL | 0 | No PFAS detected |
| Dalton Fire District | MA1070000 | Dalton | 6,330 | <MRL | <MRL | 0 | No PFAS detected |
| Danvers Water Dept. | MA3071000 | Middleton | 28,087 | <MRL | 5.2 | 0 | PFOS 1–3 × its limit |
| Dartmouth Water Division | MA4072000 | Dartmouth | 24,696 | 4.2 | 50.6 | 0.01 | PFOS ≥ 3 × its limit |
| Dedham Westwood Water Dist. | MA3073000 | Dedham | 41,630 | 6.5 | 5.1 | 0 | PFOA 1–3 × its limit |
| Dennis Water District | MA4075000 | South Dennis | 65,000 | <MRL | <MRL | 0 | Other PFAS detected |
| Devens Massdevelopment | MA2019001 | Devens | 6,500 | <MRL | <MRL | 0 | Other PFAS detected |
| Dighton Water District | MA4076000 | North Dighton | 5,280 | 5.5 | 4.1 | 0 | PFOA 1–3 × its limit |
| Douglas Water Department | MA2077000 | Douglas | 4,400 | 4 | <MRL | 0.002 | PFOA 1–3 × its limit |
| Dracut Water Supply District | MA3079000 | Collinsville | 25,808 | 6.1 | <MRL | 0.005 | PFOA 1–3 × its limit |
| Dudley Water Department | MA2080000 | Dudley | 5,515 | <MRL | <MRL | 0 | No PFAS detected |
| Duxbury Water Department | MA4082000 | Duxbury | 16,387 | 7.5 | 35 | 3.102 | PFOS ≥ 3 × its limit |
| East Bridgewater Water Dept | MA4083000 | East Bridgewater | 14,526 | 5.1 | <MRL | 0 | PFOA 1–3 × its limit |
| East Longmeadow Dpw Water Dept | MA1085000 | East Longmeadow | 16,358 | <MRL | <MRL | 0 | No PFAS detected |
| Easthampton Water Dept | MA1087000 | Easthampton | 16,211 | <MRL | <MRL | 0 | No PFAS detected |
| Easton Water Div | MA4088000 | South Easton | 25,058 | 9.9 | 16.3 | 0.792 | PFOS ≥ 3 × its limit |
| Edgartown Water Department | MA4089000 | Edgartown | 8,027 | <MRL | <MRL | 0 | No PFAS detected |
| Everett Water Dept. (Mwra) | MA3093000 | Everett | 49,075 | <MRL | <MRL | 0 | No PFAS detected |
| Fairhaven Water Dept | MA4094000 | Fairhaven | 15,155 | <MRL | <MRL | 0 | No PFAS detected |
| Fall River Water Department | MA4095000 | Fall River | 94,000 | <MRL | <MRL | 0 | No PFAS detected |
| Falmouth Water Dept | MA4096000 | Falmouth | 97,551 | <MRL | <MRL | 0 | No PFAS detected |
| Fitchburg Dpw Division Of Water Supply | MA2097000 | Fitchburg | 41,946 | 4.9 | <MRL | 0 | PFOA 1–3 × its limit |
| Foxboro Water Department | MA4099000 | Foxborough | 18,721 | 6.3 | 6.7 | 0.002 | PFOS 1–3 × its limit |
| Framingham Water Dept. (Mwra) | MA3100000 | Framingham | 72,362 | <MRL | <MRL | 0 | No PFAS detected |
| Franklin Water Department | MA2101000 | Franklin | 33,706 | 4.7 | 5.6 | 0.54 | PFOS 1–3 × its limit |
| Gardner Water Department | MA2103000 | Gardner | 21,381 | <MRL | <MRL | 0 | No PFAS detected |
| Georgetown Water Department | MA3105000 | Georgetown | 8,766 | <MRL | <MRL | 0 | No PFAS detected |
| Gloucester Public Utility Division | MA3107000 | Gloucester | 37,440 | <MRL | <MRL | 0 | No PFAS detected |
| Grafton Water District | MA2110000 | Grafton | 10,925 | 6.9 | 6.9 | 0.002 | PFOA 1–3 × its limit |
| Great Barrington Fire Dist | MA1113000 | Great Barrington | 4,380 | <MRL | <MRL | 0 | No PFAS detected |
| Greenfield Water Department | MA1114000 | Greenfield | 17,768 | <MRL | <MRL | 0 | No PFAS detected |
| Groton Water Department | MA2115000 | Groton | 5,017 | <MRL | <MRL | 0.002 | Hazard Index below its limit |
| Groveland Water Department | MA3116000 | Groveland | 6,508 | 6.3 | <MRL | 0 | PFOA 1–3 × its limit |
| Hadley Dpw Water Division | MA1117002 | Hadley | 4,819 | <MRL | <MRL | 0 | No PFAS detected |
| Halifax Water Department | MA4118000 | Halifax | 7,575 | 7.7 | 4.8 | 0.542 | PFOA 1–3 × its limit |
| Hamilton Water Dept | MA3119000 | Hamilton | 7,674 | 11.1 | 11.2 | 0.003 | PFOS 1–3 × its limit |
| Hanover Water Dept | MA4122000 | Hanover | 14,984 | 8.9 | 11.4 | 0.003 | PFOS 1–3 × its limit |
| Hanscom Afb | MA3023002 | Hanscom Afb | 11,789 | <MRL | <MRL | 0 | No PFAS detected |
| Hanson Water Department | MA4123000 | Hanson | 9,612 | 5.6 | 4 | 0 | PFOA 1–3 × its limit |
| Harwich Water Department | MA4126000 | Harwich | 39,144 | <MRL | <MRL | 0 | No PFAS detected |
| Hatfield Water Dept | MA1127000 | Hatfield | 3,164 | <MRL | <MRL | 0.006 | Hazard Index below its limit |
| Haverhill Water Dept | MA3128000 | Haverhill | 61,277 | <MRL | <MRL | 0 | No PFAS detected |
| Haystack Estates | MA3330019 | Tyngsborough | 60 | 5.6 | <MRL | 0.002 | PFOA 1–3 × its limit |
| Holbrook Public Works Dept | MA4133000 | Holbrook | 11,405 | 7 | 11.9 | 0.002 | PFOS 1–3 × its limit |
| Holden Water Division, Dpw | MA2134000 | Holden | 18,016 | 4.9 | <MRL | 0.002 | PFOA 1–3 × its limit |
| Holliston Water Department | MA2136000 | Holliston | 15,139 | 5.3 | 6.5 | 0.002 | PFOS 1–3 × its limit |
| Holyoke Water Works | MA1137000 | Holyoke | 37,838 | <MRL | <MRL | 0 | No PFAS detected |
| Hopedale Water Department | MA2138000 | Hopedale | 6,017 | 6.8 | 4.3 | 0 | PFOA 1–3 × its limit |
| Hopkinton Water Department | MA2139000 | Hopkinton | 12,680 | 7.2 | <MRL | 0.003 | PFOA 1–3 × its limit |
| Hudson Water Supply | MA2141000 | Hudson | 20,032 | <MRL | <MRL | 0 | Other PFAS detected |
| Hyannis Water System, Town Of Barnstable | MA4020004 | Hyannis | 35,000 | <MRL | <MRL | 0 | Other PFAS detected |
| Inima Usa / Aquaria Llc | MA4076004 | North Dighton | 105,643 | <MRL | <MRL | 0 | No PFAS detected |
| Ipswich Dpu Water Dept | MA3144000 | Ipswich | 13,138 | 7.3 | <MRL | 0.002 | PFOA 1–3 × its limit |
| Kenwood Water District | MA3079001 | Dracut | 9,620 | 6.3 | <MRL | 0.002 | PFOA 1–3 × its limit |
| Kingston Water Department | MA4145000 | Kingston | 14,715 | <MRL | <MRL | 0 | No PFAS detected |
| Lancaster Water Department | MA2147000 | Lancaster | 6,000 | <MRL | <MRL | 0 | No PFAS detected |
| Lawrence Water Works | MA3149000 | Lawrence | 89,143 | <MRL | <MRL | 0 | Other PFAS detected |
| Lee Water Dept | MA1150000 | Lee | 5,686 | <MRL | <MRL | 0 | No PFAS detected |
| Lenox Dpw Water Division | MA1152000 | Lenox | 9,800 | <MRL | <MRL | 0 | No PFAS detected |
| Leominster Water Division | MA2153000 | Leominster | 41,683 | 4.3 | <MRL | 0 | PFOA 1–3 × its limit |
| Lexington Water Dept. (Mwra) | MA3155000 | Lexington | 34,074 | <MRL | <MRL | 0 | No PFAS detected |
| Lincoln Water Dept | MA3157000 | Lincoln | 5,593 | 6.4 | 5.4 | 0.32 | PFOA 1–3 × its limit |
| Littleton Water Department | MA2158000 | Littleton | 9,334 | <MRL | <MRL | 0 | No PFAS detected |
| Longmeadow Water Dept | MA1159000 | Longmeadow | 15,853 | <MRL | <MRL | 0 | No PFAS detected |
| Lowell Regional Water Utility | MA3160000 | Lowell | 120,418 | 4.6 | <MRL | 0 | PFOA 1–3 × its limit |
| Lunenburg Water District | MA2162000 | Lunenburg | 7,219 | 5.1 | <MRL | 0 | PFOA 1–3 × its limit |
| Lynn Water And Sewer Comm | MA3163000 | Lynn | 101,253 | 4.7 | <MRL | 0.002 | PFOA 1–3 × its limit |
| Lynnfield Center Water District | MA3164000 | Lynnfield | 8,525 | 6.1 | <MRL | 0 | PFOA 1–3 × its limit |
| Lynnfield Water Dist. (Mwra) | MA3164001 | Lynnfield | 4,820 | <MRL | <MRL | 0 | No PFAS detected |
| Malden Water Division (Mwra) | MA3165000 | Malden | 66,263 | <MRL | <MRL | 0 | No PFAS detected |
| Manchester By The Sea Dpw | MA3166000 | Manchester By The Sea | 5,201 | 12 | 4.8 | 0.003 | PFOA ≥ 3 × its limit |
| Mansfield Water Division | MA4167000 | Mansfield | 21,797 | 4.3 | 6.2 | 0.312 | PFOS 1–3 × its limit |
| Marblehead Water Dept. (Mwra) | MA3168000 | Marblehead | 20,441 | <MRL | <MRL | 0 | No PFAS detected |
| Marion Water Division | MA4169000 | Marion | 6,119 | <MRL | <MRL | 0 | No PFAS detected |
| Marlborough Dpw Water Div. (Mwra) | MA2170000 | Marlborough | 41,799 | <MRL | <MRL | 0 | No PFAS detected |
| Marshfield Water Department | MA4171000 | Marshfield | 34,000 | 7 | 4.6 | 0.002 | PFOA 1–3 × its limit |
| Mashpee Water District | MA4172039 | Mashpee | 36,922 | <MRL | <MRL | 0 | Other PFAS detected |
| Mattapoisett River Valley W.D. | MA4173001 | Mattapoisett | 29,600 | <MRL | <MRL | 0 | No PFAS detected |
| Mattapoisett Water Department | MA4173000 | Mattapoisett | 7,685 | <MRL | <MRL | 0 | No PFAS detected |
| Maynard Dpw, Water Division | MA2174000 | Maynard | 10,746 | 7.1 | 4.2 | 0.002 | PFOA 1–3 × its limit |
| Mci Norfolk/Cedar Junction/Walpole | MA2208001 | Milford | 2,200 | <MRL | <MRL | 0 | No PFAS detected |
| Mci Shirley | MA2270001 | Milford | 3,500 | <MRL | <MRL | 0.87 | Hazard Index below its limit |
| Medfield Water Dept. | MA2175000 | Medfield | 12,713 | 7 | 6.7 | 0.002 | PFOA 1–3 × its limit |
| Medford Water Dept. (Mwra) | MA3176000 | Medford | 61,700 | <MRL | <MRL | 0 | No PFAS detected |
| Medway Water Department | MA2177000 | Medway | 14,176 | 7.2 | <MRL | 0.002 | PFOA 1–3 × its limit |
| Melrose Water Division (Mwra) | MA3178000 | Melrose | 29,938 | <MRL | <MRL | 0 | No PFAS detected |
| Merrimac Water Department | MA3180000 | Merrimac | 6,988 | 6.9 | <MRL | 0 | PFOA 1–3 × its limit |
| Methuen Water Dept | MA3181000 | Methuen | 53,059 | 4 | <MRL | 0 | PFOA 1–3 × its limit |
| Middleborough Water Supply | MA4182000 | Middleborough | 15,350 | 11 | 5 | 0.3 | PFOA 1–3 × its limit |
| Middleton Water Dept. | MA3184000 | Middleton | 7,291 | 4.5 | <MRL | 0.002 | PFOA 1–3 × its limit |
| Milford Water Department | MA2185000 | Milford | 30,379 | 7.1 | 6.6 | 0.002 | PFOA 1–3 × its limit |
| Millis Water Dept | MA2187000 | Millis | 9,055 | 6.9 | 7.3 | 0.005 | PFOS 1–3 × its limit |
| Milton Water Dept. (Mwra) | MA3189000 | Milton | 28,630 | <MRL | <MRL | 0 | No PFAS detected |
| Monson Water And Sewer Dept | MA1191000 | Monson | 4,222 | <MRL | <MRL | 0 | No PFAS detected |
| Mt Greylock Regional School | MA1341010 | Williamstown | 930 | <MRL | <MRL | 0 | No PFAS detected |
| Nahant Water Dept. (Mwra) | MA3196000 | Nahant | 3,334 | <MRL | <MRL | 0 | No PFAS detected |
| Natick Water And Sewer Division | MA3198000 | Natick | 37,006 | 14.3 | 37.3 | 1.123 | PFOS ≥ 3 × its limit |
| Needham Water Dept | MA3199000 | Needham | 31,664 | 4.6 | 5 | 0 | PFOS 1–3 × its limit |
| Newburyport Water Department | MA3206000 | Newburyport | 20,335 | <MRL | 4.6 | 0.002 | PFOS 1–3 × its limit |
| Newton Water Dept. (Mwra) | MA3207000 | Newton | 88,931 | <MRL | <MRL | 0 | No PFAS detected |
| Norfolk Water Division | MA2208000 | Norfolk | 7,602 | 7 | 4.5 | 0.002 | PFOA 1–3 × its limit |
| North Adams Water Dept | MA1209000 | North Adams | 13,000 | 5.9 | <MRL | 0 | PFOA 1–3 × its limit |
| North Andover Water Dept | MA3210000 | North Andover | 30,915 | <MRL | <MRL | 0 | No PFAS detected |
| North Attleboro Water Dept | MA4211000 | North Attleborough | 31,410 | 9 | 8 | 0.402 | PFOA 1–3 × its limit |
| North Brookfield Water Department | MA2212000 | North Brookfield | 3,863 | <MRL | <MRL | 0 | No PFAS detected |
| North Chelmsford Water Dist | MA3056002 | North Chelmsford | 7,660 | <MRL | <MRL | 0 | No PFAS detected |
| North Raynham Water District | MA4245002 | Raynham | 3,902 | <MRL | <MRL | 0 | Other PFAS detected |
| North Reading Water Dept. | MA3213000 | North Reading | 16,379 | <MRL | <MRL | 0 | Other PFAS detected |
| North Sagamore Water District | MA4036002 | Sagamore Beach | 4,668 | <MRL | <MRL | 0 | Other PFAS detected |
| Northampton Water Division | MA1214000 | Northampton | 29,571 | <MRL | <MRL | 0 | No PFAS detected |
| Northborough Water Department (Mwra) | MA2215000 | Northborough | 13,551 | <MRL | <MRL | 0 | No PFAS detected |
| Northbridge Water Division | MA2216006 | Northbridge | 8,127 | <MRL | <MRL | 0 | No PFAS detected |
| Norton Water Department | MA4218000 | Norton | 19,161 | 8.8 | 4 | 0.64 | PFOA 1–3 × its limit |
| Norwell Water Department | MA4219000 | Norwell | 11,495 | 9.9 | 18.4 | 0.004 | PFOS ≥ 3 × its limit |
| Norwood Water Dept. (Mwra) | MA4220000 | Norwood | 29,909 | <MRL | <MRL | 0 | No PFAS detected |
| Oak Bluffs Water District | MA4221000 | Oak Bluffs | 24,000 | <MRL | <MRL | 0 | Other PFAS detected |
| Onset Fire Districtwater Dept. | MA4310003 | Onset | 5,392 | <MRL | 7.1 | 0 | PFOS 1–3 × its limit |
| Orange Water Dept | MA1223000 | Orange | 6,526 | <MRL | <MRL | 0.48 | Hazard Index below its limit |
| Orleans Water Department | MA4224000 | Orleans | 17,460 | <MRL | <MRL | 0 | No PFAS detected |
| Otis Air National Guard Base | MA4096001 | Buzzards Bay | 6,000 | <MRL | <MRL | 0 | No PFAS detected |
| Palmer Water District No.1 | MA1227000 | Palmer | 4,789 | <MRL | <MRL | 0 | No PFAS detected |
| Paxton Water Department | MA2228000 | Paxton | 4,300 | <MRL | <MRL | 0 | Other PFAS detected |
| Peabody Water Dept. | MA3229000 | West Peabody | 54,481 | 7 | <MRL | 0.002 | PFOA 1–3 × its limit |
| Pembroke Water Division Dpw | MA4231000 | Pembroke | 18,175 | <MRL | <MRL | 0 | Other PFAS detected |
| Pepperell Dpw Water Division | MA2232000 | Pepperell | 9,217 | 11.4 | 10 | 0 | PFOA 1–3 × its limit |
| Pittsfield Dpu Water Dept | MA1236000 | Pittsfield | 43,927 | <MRL | <MRL | 0 | No PFAS detected |
| Plainville Water Department | MA4238000 | Plainville | 8,805 | 4.3 | 5.9 | 0.009 | PFOS 1–3 × its limit |
| Plymouth Water Department | MA4239000 | Plymouth | 47,100 | <MRL | <MRL | 0.002 | Hazard Index below its limit |
| Provincetown Water Department | MA4242000 | Provincetown | 22,250 | <MRL | <MRL | 0 | No PFAS detected |
| Quincy Water Dept. (Mwra) | MA3243000 | Quincy | 106,000 | <MRL | <MRL | 0 | No PFAS detected |
| Randolph Water Department | MA4244000 | Randolph | 35,114 | 7.3 | 13 | 0.3 | PFOS ≥ 3 × its limit |
| Raynham Center Water District | MA4245000 | Raynham | 10,964 | 92 | <MRL | 0.32 | PFOA ≥ 3 × its limit |
| Reading Water Department (Mwra) | MA3246000 | Reading | 26,262 | <MRL | <MRL | 0 | No PFAS detected |
| Revere Water Division (Mwra) | MA3248000 | Revere | 62,186 | <MRL | <MRL | 0 | Other PFAS detected |
| Rockport Water Dept | MA3252000 | Rockport | 10,000 | <MRL | <MRL | 0 | No PFAS detected |
| Rowley Water Department | MA3254000 | Rowley | 6,161 | 7.7 | 5.7 | 0 | PFOA 1–3 × its limit |
| Rutland Water Department | MA2257000 | Rutland | 6,025 | <MRL | <MRL | 0 | No PFAS detected |
| Salem Water Department | MA3258000 | Salem | 44,480 | <MRL | <MRL | 0 | Other PFAS detected |
| Salisbury Water Division | MA3259000 | Salisbury | 9,334 | 6 | <MRL | 0 | PFOA 1–3 × its limit |
| Sandwich Water District | MA4261000 | Sandwich | 23,000 | <MRL | <MRL | 0 | No PFAS detected |
| Saugus Water Dept. (Mwra) | MA3262000 | Saugus | 27,844 | <MRL | <MRL | 0 | No PFAS detected |
| Scituate Water Division | MA4264000 | Scituate | 19,297 | 5.6 | 5.7 | 0.002 | PFOS 1–3 × its limit |
| Seekonk Water District | MA4265000 | Seekonk | 13,801 | <MRL | 5 | 0 | PFOS 1–3 × its limit |
| Sharon Water Dept | MA4266000 | Sharon | 16,846 | 8.1 | 15 | 2.902 | PFOS ≥ 3 × its limit |
| Shirley Water District | MA2270000 | Shirley | 4,165 | 6.9 | <MRL | 0.002 | PFOA 1–3 × its limit |
| Shrewsbury Water Department | MA2271000 | Shrewsbury | 38,325 | 5.4 | 5.6 | 0.002 | PFOS 1–3 × its limit |
| Somerset Water Department | MA4273000 | Somerset | 18,303 | <MRL | <MRL | 0 | No PFAS detected |
| Somerville Water Dept. (Mwra) | MA3274000 | Somerville | 81,045 | <MRL | <MRL | 0 | No PFAS detected |
| South Deerfield Water Supply District | MA1074001 | South Deerfield | 3,800 | <MRL | <MRL | 0 | No PFAS detected |
| South Hadley Fd #1 (Mwra) | MA1275000 | South Hadley | 14,800 | <MRL | <MRL | 0 | No PFAS detected |
| South Hadley Fire District #2 Water Dept | MA1275001 | South Hadley | 6,200 | <MRL | <MRL | 0 | No PFAS detected |
| Southampton Water Dept | MA1276000 | Southampton | 4,853 | <MRL | <MRL | 0 | No PFAS detected |
| Southborough Dpw Water Division (Mwra) | MA2277000 | Southborough | 10,638 | <MRL | <MRL | 0 | No PFAS detected |
| Southbridge Tool And Manufacturing | MA2080006 | Dudley | 58 | <MRL | <MRL | 0 | No PFAS detected |
| Southbridge Water Department | MA2278000 | Southbridge | 19,562 | <MRL | <MRL | 0 | Other PFAS detected |
| Southwick Water Dept | MA1279000 | Southwick | 7,669 | <MRL | <MRL | 0 | No PFAS detected |
| Spencer Water Department | MA2280000 | Spencer | 7,037 | <MRL | <MRL | 0 | No PFAS detected |
| Springfield Water And Sewer Commission | MA1281000 | Springfield | 169,170 | <MRL | <MRL | 0 | No PFAS detected |
| Sterling Water Department | MA2282000 | Sterling | 6,814 | <MRL | 5.2 | 0 | PFOS 1–3 × its limit |
| Stoneham Water Dept (Mwra Supply) | MA3284000 | Stoneham | 23,244 | <MRL | <MRL | 0 | No PFAS detected |
| Stoughton Water Department | MA4285000 | Stoughton | 29,281 | 7.7 | 7.1 | 0.002 | PFOA 1–3 × its limit |
| Sturbridge Water Department | MA2287000 | Sturbridge | 4,746 | <MRL | <MRL | 0 | No PFAS detected |
| Sudbury Water District | MA3288000 | Sudbury | 18,416 | 9 | <MRL | 0.002 | PFOA 1–3 × its limit |
| Swampscott Water Dept. (Mwra) | MA3291000 | Swampscott | 15,300 | <MRL | <MRL | 0 | No PFAS detected |
| Swansea Water District | MA4292000 | Swansea | 17,375 | 5.1 | <MRL | 0.771 | PFOA 1–3 × its limit |
| Taunton Water Division | MA4293000 | Taunton | 62,165 | <MRL | <MRL | 0 | No PFAS detected |
| Templeton Munic. Light And Water Plant | MA2294000 | Baldwinville | 6,159 | 5.2 | <MRL | 0 | PFOA 1–3 × its limit |
| Tewksbury Water Department | MA3295000 | Tewksbury | 31,342 | 5 | <MRL | 0 | PFOA 1–3 × its limit |
| Tisbury Water Works | MA4296000 | Tisbury | 6,082 | <MRL | <MRL | 0 | No PFAS detected |
| Topsfield Water Department | MA3298000 | Topsfield | 5,435 | 9 | 5.4 | 0.002 | PFOA 1–3 × its limit |
| Town Of Avon | MA4018000 | Avon | 4,777 | 5.1 | 6 | 0 | PFOS 1–3 × its limit |
| Town Of Eastham | MA4086095 | Eastham | 6,199 | <MRL | <MRL | 0 | No PFAS detected |
| Townsend Water Department | MA2299000 | Townsend | 6,832 | 6.5 | <MRL | 0 | PFOA 1–3 × its limit |
| Turners Falls Water Dept | MA1192000 | Turners Falls | 8,080 | <MRL | <MRL | 0 | No PFAS detected |
| Tyngsborough Water District | MA3301000 | Tyngsborough | 4,416 | 4.6 | <MRL | 0 | PFOA 1–3 × its limit |
| Upper Cape Regional Water Cooperative | MA4261024 | Sandwich | 56,250 | <MRL | <MRL | 0 | No PFAS detected |
| Upton Dpw Water/Wastewater Division | MA2303000 | Upton | 4,420 | <MRL | <MRL | 0 | No PFAS detected |
| Uxbridge Dpw, Water Division | MA2304000 | Uxbridge | 11,612 | <MRL | 6.7 | 0.342 | PFOS 1–3 × its limit |
| Wakefield Water Dept | MA3305000 | Wakefield | 27,090 | 6.9 | <MRL | 0 | PFOA 1–3 × its limit |
| Walpole Water Dept | MA4307000 | Walpole | 24,070 | 4 | 4 | 0 | PFOA 1–3 × its limit |
| Waltham Water Department | MA3308000 | Waltham | 65,218 | <MRL | <MRL | 0 | No PFAS detected |
| Wannacomet Water Company | MA4197000 | Nantucket | 27,703 | <MRL | <MRL | 0 | No PFAS detected |
| Ware Water Dept | MA1309000 | Ware | 10,066 | 4.9 | 7.1 | 0 | PFOS 1–3 × its limit |
| Wareham Fire District | MA4310000 | Parkwood Beach | 20,102 | <MRL | <MRL | 0 | No PFAS detected |
| Watertown Department Of Public Works | MA3314000 | Watertown | 35,985 | <MRL | <MRL | 0 | No PFAS detected |
| Wayland Water Department | MA3315000 | Wayland | 14,096 | 9 | 4 | 0 | PFOA 1–3 × its limit |
| Webster Water Department | MA2316000 | Webster | 17,776 | 4.4 | <MRL | 0 | PFOA 1–3 × its limit |
| Weir River Water System | MA4131000 | Hingham | 45,339 | 6.4 | <MRL | 0.002 | PFOA 1–3 × its limit |
| Wellesley Water Division | MA3317000 | Wellesley | 29,550 | 6.3 | 6.6 | 0.003 | PFOS 1–3 × its limit |
| Wenham Water Dept. | MA3320000 | Wenham | 3,942 | 7.2 | 6.4 | 0.002 | PFOA 1–3 × its limit |
| West Boylston Water District | MA2321000 | West Boylston | 6,919 | 5.4 | <MRL | 0 | PFOA 1–3 × its limit |
| West Bridgewater Water Dept | MA4322000 | West Bridgewater | 7,709 | 5.5 | <MRL | 0.002 | PFOA 1–3 × its limit |
| West Newbury Water Department | MA3324000 | West Newbury | 4,704 | <MRL | <MRL | 0 | No PFAS detected |
| West Springfield Dpw Water Division | MA1325000 | West Springfield | 28,835 | <MRL | <MRL | 0 | No PFAS detected |
| Westborough Water Department | MA2328000 | Westborough | 21,567 | 5.8 | 7.5 | 0.002 | PFOS 1–3 × its limit |
| Westfield Dpwwater Division | MA1329000 | Westfield | 41,094 | <MRL | <MRL | 0 | Other PFAS detected |
| Westford Water Department | MA3330000 | Westford | 18,848 | 8.6 | 4.4 | 0.002 | PFOA 1–3 × its limit |
| Westminster Department Of Public Works | MA2332000 | Westminster | 3,889 | <MRL | <MRL | 0 | No PFAS detected |
| Weston Water Dept. | MA3333000 | Weston | 11,391 | <MRL | <MRL | 0 | No PFAS detected |
| Weymouth Water Department | MA4336000 | Weymouth | 57,871 | <MRL | <MRL | 0 | Other PFAS detected |
| Whately Water Department | MA1337010 | South Deerfield | 900 | <MRL | <MRL | 0 | No PFAS detected |
| Whitinsville Water Company | MA2216000 | Whitinsville | 7,899 | <MRL | <MRL | 0 | No PFAS detected |
| Whitman Water System | MA4338000 | Whitman | 14,947 | <MRL | <MRL | 0.002 | Hazard Index below its limit |
| Wilbraham Water Dept (Mwra) | MA1339000 | Wilbraham | 8,533 | <MRL | <MRL | 0 | No PFAS detected |
| Williamstown Water Dept | MA1341000 | Williamstown | 7,326 | <MRL | <MRL | 0 | No PFAS detected |
| Wilmington Water Dept | MA3342000 | Wilmington | 21,654 | <MRL | <MRL | 0 | Other PFAS detected |
| Winchendon Water Department | MA2343000 | Winchendon | 5,706 | <MRL | <MRL | 0 | No PFAS detected |
| Winchester Water Dept | MA3344000 | Winchester | 22,970 | <MRL | <MRL | 0 | No PFAS detected |
| Winthrop Water Division, (Mwra) | MA3346000 | Winthrop | 19,316 | <MRL | <MRL | 0 | No PFAS detected |
| Woburn Water Dept. | MA3347000 | Woburn | 40,876 | 8.4 | 6.9 | 0.002 | PFOA 1–3 × its limit |
| Worcester Dpwp, Water Supply Division | MA2348000 | Worcester | 206,518 | <MRL | <MRL | 0 | Other PFAS detected |
| Wrentham Water Division | MA4350000 | Wrentham | 12,190 | 5.7 | 4.4 | 0.003 | PFOA 1–3 × its limit |
| Yarmouth Water Department | MA4351000 | West Yarmouth | 38,900 | <MRL | <MRL | 0.31 | Hazard Index below its limit |
Not tested under UCMR 5 (509)
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 |
|---|---|---|---|---|---|
| 10 Thru 16 Hastings Street | MA2179009 | NTNCWS | Mendon | 174 | Worcester County |
| 122 Main Street | MA1053033 | CWS | Gardner | 30 | Franklin County |
| 1300 Mass Ave | MA2037020 | NTNCWS | Boxborough | 31 | Middlesex County |
| 1414 Mass Ave Boxborough | MA2037017 | NTNCWS | Maynard | 50 | Middlesex County |
| 155 Swanson Rd Synqor | MA2037024 | NTNCWS | Quincy | 100 | Middlesex County |
| 159 Swanson Rd Setra Systems Inc | MA2037018 | NTNCWS | Quincy | 278 | Middlesex County |
| 2 Allen St Professional Bldg | MA1120022 | NTNCWS | Wilbraham | 30 | Hampden County |
| 28 Hastings St Corp | MA2179002 | NTNCWS | Mendon | 63 | Worcester County |
| 330 Codman Hill Road | MA2037023 | NTNCWS | Boxborough | 150 | Middlesex County |
| 60 And 70 Codman Hill Rd | MA2037021 | NTNCWS | Concord | 150 | Middlesex County |
| 85 Swanson Rd Llc | MA2037022 | NTNCWS | Houston | 40 | Middlesex County |
| Acushnet Manufactured Homes | MA4003004 | CWS | Acushnet | 85 | Bristol County |
| Adams Farm Slaughterhouse Llc | MA1015001 | NTNCWS | Athol | 45 | Worcester County |
| Agawam Springs Water Company | MA4239060 | CWS | Wareham | 2,380 | Plymouth County |
| Alphabet Soup Child Care Center | MA1111037 | NTNCWS | Granby | 30 | Hampshire County |
| American Institute For Economic Research | MA1113028 | NTNCWS | Great Barrington | 25 | Berkshire County |
| Anchor Academy Berkley | MA4027007 | NTNCWS | Berkley | 41 | Bristol County |
| Andrews Farm Water Co.,Inc. | MA3038020 | CWS | Newberry | 150 | Essex County |
| Applegreen | MA2287005 | NTNCWS | Andover | 185 | Worcester County |
| Applewood Community Corporation | MA2037013 | CWS | Boxborough | 500 | Middlesex County |
| Applewood Home For Elders | MA1015006 | CWS | Athol | 50 | Worcester County |
| Aquarion Water Co. (Springdale Farms) | MA3078008 | CWS | Millbury | 126 | Norfolk County |
| Aquarion Water Company | MA1267000 | CWS | Bridgeport | 987 | Berkshire County, Plymouth County |
| Aquarion Water Company (Dover) | MA3078006 | CWS | Millbury | 1,929 | Norfolk County |
| Aquarion Water Company Ponds Of Plymouth | MA4239045 | CWS | Millbury | 2,267 | Plymouth County |
| Aquinnah Wampanoag | 010307001 | CWS | Chilmark | 89 | |
| Arbor Glen Condominiums | MA2286026 | CWS | Exeter | 132 | Middlesex County |
| Ashby Elementary School | MA2012002 | NTNCWS | Pepperell | 237 | Middlesex County |
| Ashfield Water District | MA1013000 | CWS | Ashfield | 400 | Franklin County |
| Ashmere Water Service | MA1132008 | CWS | Hinsdale | 66 | Berkshire County |
| Assurance Technology Corp. | MA3051011 | NTNCWS | Carlisle | 75 | Middlesex County |
| Ayer Road Properties Llc | MA2125021 | CWS | Harvard | 150 | Worcester County |
| Bachelor Knolls | MA1111000 | CWS | Granby | 101 | Hampshire County |
| Bangmas Farm Store And Dairy Bar | MA2304014 | NTNCWS | Whitinsville | 34 | Worcester County |
| Bard College At Simons Rock | MA1113017 | CWS | Great Barrington | 500 | Berkshire County |
| Barnstable County Jail | MA4036015 | CWS | Bourne | 600 | Barnstable County |
| Barre Mhp/Waterwheel Village | MA2021001 | CWS | Barre | 114 | Worcester County |
| Bartows Mobile Home Park | MA1225038 | CWS | Otis | 25 | Berkshire County |
| Beaver Pond Meadows | MA1121011 | CWS | North Adams | 160 | Berkshire County |
| Becket Washington School | MA1022011 | NTNCWS | Becket | 175 | Berkshire County |
| Bedford Va Hospital (Rogers Mem. Hosp.) | MA3023001 | CWS | Bedford | 177 | Middlesex County |
| Beechwood Point Condos | MA4172035 | CWS | Mashpee | 112 | Barnstable County |
| Benchmark Condominiums | MA3301008 | CWS | Tyngsborough | 60 | Middlesex County |
| Benfield Farms | MA3051021 | CWS | East Boston | 50 | Middlesex County |
| Berkley Community School | MA4027003 | NTNCWS | Berkley | 647 | Bristol County |
| Berkley Middle School/Town Offices | MA4027001 | NTNCWS | Berkley | 500 | Bristol County |
| Berkshire Country Day School | MA1283013 | NTNCWS | Lenox | 250 | Berkshire County |
| Berkshire Estates | MA1058002 | CWS | Summerland | 180 | Berkshire County |
| Berkshire Mall Llc | MA1148011 | NTNCWS | Lanesborough | 500 | Berkshire County |
| Berkshire Rehab Skilled Care Ctr | MA1260001 | CWS | Sandisfield | 100 | Berkshire County |
| Berkshire School | MA1267001 | CWS | Sheffield | 425 | Berkshire County |
| Berkshire Waldorf School | MA1113013 | NTNCWS | Great Barrington | 300 | Berkshire County |
| Berlin Memorial School | MA2028009 | NTNCWS | Berlin | 275 | Worcester County |
| Bernardston Fire Water Dist | MA1029000 | CWS | Bernardston | 1,471 | Franklin County |
| Bishops Landing Condominiums | MA4285007 | CWS | Duxbury | 50 | Norfolk County |
| Bisselville Estate | MA1132009 | CWS | Hinsdale | 74 | Berkshire County |
| Bittersweet Farm Inc | MA4334065 | NTNCWS | Westport | 180 | Bristol County |
| Bjs Wholesale Distribution Center | MA2304013 | NTNCWS | Uxbridge | 225 | Worcester County |
| Blackstone Valley Cannabis | MA2304018 | NTNCWS | Uxbridge | 50 | Worcester County |
| Blandford Water Dept | MA1033000 | CWS | Blandford | 442 | Hampden County |
| Bolton Corners | MA2034006 | NTNCWS | Bolton | 100 | Worcester County |
| Bolton Country Manor | MA2034027 | CWS | Worcester | 60 | Worcester County |
| Bolton Office Park Alta Nashoba Valley | MA2034019 | CWS | Bolton | 788 | Worcester County |
| Bondsville Fire And Water District | MA1227002 | CWS | Bondsville | 1,429 | Hampden County, Hampshire County |
| Boxborough Executive Office Center | MA2037019 | NTNCWS | Boxborough | 60 | Middlesex County |
| Boxborough Municipal Buildings | MA2037010 | NTNCWS | Boxborough | 600 | Middlesex County |
| Boxborough Regency | MA2037008 | NTNCWS | Boxborough | 500 | Middlesex County |
| Boxford Police Station | MA3038026 | NTNCWS | Boxford | 25 | Essex County |
| Breton Estates | MA1227015 | CWS | Palmer | 48 | Hampden County |
| Briarwood Townhomes | MA2140013 | CWS | Nashua | 40 | Worcester County |
| Briggsville Water District | MA1063003 | CWS | Clarksburg | 180 | Berkshire County |
| Bright Horizons Daycare | MA2037035 | NTNCWS | Watertown | 90 | Middlesex County |
| Brimfield Elementary School | MA1043014 | NTNCWS | Brimfield | 327 | Hampden County |
| Brimfield Housing Authority | MA1043002 | CWS | Brimfield | 60 | Hampden County |
| Brook Village Condominium | MA2037007 | CWS | Hopkinton | 400 | Middlesex County |
| Brookfield Meadows Mhp | MA2045005 | CWS | Brookfield | 120 | Worcester County |
| Brookfield Water Department | MA2045000 | CWS | Brookfield | 1,008 | Worcester County |
| Brookside Mobile Home Park | MA4003002 | CWS | New Bedford | 67 | Bristol County |
| Brookside Village | MA1306001 | CWS | Norwich | 80 | Hampden County |
| Broomfield Laboratories | MA2034022 | NTNCWS | Leominster | 25 | Worcester County |
| Buffumville Heights Estates Condominium | MA2226008 | CWS | Oxford | 40 | Worcester County |
| Business Park West Condominium Trust | MA3301030 | NTNCWS | Tyngsborough | 30 | Middlesex County |
| Byfield Water District | MA3205001 | CWS | Byfield | 2,228 | Essex County |
| Cady Brook Crossing Condominiums | MA2054050 | CWS | Shrewbury | 75 | Worcester County |
| Campanelli Development | MA2037034 | NTNCWS | Braintree | 1,200 | Middlesex County |
| Cape Cod Space Force Station | MA4036008 | NTNCWS | Sagamore | 130 | Barnstable County |
| Carlisle Extended Day Program,Inc. | MA3051016 | NTNCWS | Carlisle | 70 | Middlesex County |
| Carlisle Public School | MA3051004 | NTNCWS | Carlisle | 725 | Middlesex County |
| Carlisle Village Court | MA3051025 | CWS | 25 | Middlesex County | |
| Carriage House Condominium | MA2037009 | CWS | Acton | 68 | Middlesex County |
| Carver Elementary School | MA4052007 | NTNCWS | Carver | 800 | Plymouth County |
| Carver High School And Middle School | MA4052064 | NTNCWS | Carver | 1,200 | Plymouth County |
| Carver Municipal Buildings | MA4052061 | CWS | Carver | 100 | Plymouth County |
| Ccns Marconi Area | MA4318047 | NTNCWS | Wellfleet | 499 | Barnstable County |
| Cedar Brook School | MA4247028 | NTNCWS | Rehoboth | 80 | Bristol County |
| Cedarwood Apartments | MA1024009 | CWS | Granby | 25 | Hampshire County |
| Centre Village Apartments | MA2037006 | CWS | Harvard | 36 | Middlesex County |
| Century Mill Estates | MA2034031 | CWS | Bolton | 135 | Worcester County |
| Charlton Manor Rest Home | MA2054005 | CWS | Westborough | 26 | Worcester County |
| Chase Corporation | MA2226016 | NTNCWS | Westwood | 91 | Worcester County |
| Cheshire Water Dept | MA1058000 | CWS | Cheshire | 1,407 | Berkshire County |
| Chester / Middlefield Elem School | MA1059012 | NTNCWS | Huntington | 123 | Hampden County |
| Chester Water Dept | MA1059000 | CWS | Chester | 750 | Hampden County |
| Children First Enterprises Inc | MA1111038 | NTNCWS | Granby | 121 | Hampshire County |
| Chilmark Preschool | MA4062009 | NTNCWS | Chilmark | 40 | Dukes County |
| Chilmark School | MA4062008 | NTNCWS | Chilmark | 90 | Dukes County |
| Clark Shores Water Corporation | MA4146006 | CWS | Lakeville | 350 | Plymouth County |
| Clarks Corvair Parts | MA1268003 | NTNCWS | Shelburne | 27 | Franklin County |
| Clarksburg Elementary School | MA1063008 | NTNCWS | North Adams | 250 | Berkshire County |
| Cliffside Apartments | MA1289001 | CWS | Spring Valley | 500 | Franklin County |
| Coaksett Commons | MA4334091 | NTNCWS | S. Dartmouth | 68 | Bristol County |
| Cobblers Creek Condominiums | MA2303005 | CWS | Sutton | 118 | Worcester County |
| Codman Hill Condominium | MA2037001 | CWS | Sudbury | 360 | Middlesex County |
| Cold Spring Country Club | MA1024013 | NTNCWS | Belchertown | 75 | Hampshire County |
| Colony Heights Condominium | MA3301020 | CWS | Tyngsborough | 120 | Middlesex County |
| Colrain Central Elem School | MA1066004 | NTNCWS | Colrain | 115 | Franklin County |
| Colrain Fire District #1 | MA1066000 | CWS | Colrain | 100 | Franklin County |
| Conway Grammar School | MA1068006 | NTNCWS | South Deerfield | 261 | Franklin County |
| Cool Sandy Beach Community Water System | MA2257003 | CWS | Rutland | 70 | Worcester County |
| Corrigan Mental Health Center | MA4095010 | NTNCWS | Fall River | 152 | Bristol County |
| Cosgrove Realty | MA2037025 | NTNCWS | Harvard | 25 | Middlesex County |
| Country Montessori Preschool | MA2290029 | NTNCWS | Sutton | 83 | Worcester County |
| Countryside Condominium | MA2110004 | CWS | Northboro | 30 | Worcester County |
| Cpi Radant Technologies, Inc | MA2286020 | NTNCWS | Gleasondale | 110 | Middlesex County |
| Craftsman Village Condominiums | MA2125026 | CWS | Waltham | 40 | Worcester County |
| Cranberry Knoll | MA4240008 | CWS | Halifax | 40 | Plymouth County |
| Cranberry Village Residents Association | MA4052026 | CWS | Carver | 414 | Plymouth County |
| Crescent Valley Condos | MA1111025 | CWS | West Springfield | 78 | Hampshire County |
| Cummington Water Dept | MA1069001 | CWS | Cummington | 320 | Hampshire County |
| Curtis Hill Condominium | MA3301035 | CWS | Westford | 96 | Middlesex County |
| Cutchins Program For Children Families | MA1024023 | NTNCWS | Belchertown | 25 | Hampshire County |
| Dambrosio Eye Care, Inc. | MA2147007 | NTNCWS | Gardner | 125 | Worcester County |
| Dcr Quabbin Administration Building | MA1024011 | NTNCWS | Belchertown | 80 | Hampshire County |
| Deer Island (Mwra) | MA3035001 | NTNCWS | Chelsea | 350 | Suffolk County |
| Deerfield Estates | MA2139006 | CWS | Southborough | 100 | Middlesex County |
| Deerfield Fire District | MA1074000 | CWS | Deerfield | 1,300 | Franklin County |
| Dennett Elementary School | MA4240004 | NTNCWS | Plympton | 282 | Plymouth County |
| Dorothy L Beckwith Middle School | MA4247002 | NTNCWS | North Dighton | 1,600 | Bristol County |
| Dover Water Dept | MA3078000 | NTNCWS | Dover | 500 | Norfolk County |
| Dragon Hill Condominiums | MA1268011 | CWS | Shelburne | 30 | Franklin County |
| Drummer Boy Condominiums | MA4318010 | NTNCWS | Hingham | 25 | Barnstable County |
| Dunstable Water Department | MA2081000 | CWS | Dunstable | 337 | Middlesex County |
| Eagle Hill School | MA1124003 | CWS | Hardwick | 300 | Worcester County |
| Eaglebrook School | MA1074005 | CWS | Deerfield | 350 | Franklin County |
| East Brookfield Water Department | MA2084000 | CWS | East Brookfield | 1,526 | Worcester County |
| East Chelmsford Water District | MA3056001 | CWS | Chelmsford | 2,800 | Middlesex County |
| East Northfield Water Co | MA1217001 | CWS | Northfield | 659 | Franklin County |
| Egremont Water Dept | MA1090000 | CWS | South Egremont | 1,000 | Berkshire County |
| Elizabeth Brook Apartments | MA2286017 | CWS | Stow | 54 | Middlesex County |
| Elm Hill Water District | MA2017001 | CWS | Auburn | 2,278 | Worcester County |
| Emerson Hospital | MA3067020 | NTNCWS | Concord | 1,200 | Middlesex County |
| Enclave At Boxborough | MA2037038 | CWS | Boylston | 100 | Middlesex County |
| Erving Paper Mills | MA1091005 | NTNCWS | Erving | 135 | Franklin County |
| Erving Water Dept | MA1091000 | CWS | Erving | 561 | Franklin County |
| Essex Water Dept. | MA3092000 | CWS | Essex | 3,675 | Essex County |
| Estates At Highland Ridge | MA2139010 | CWS | Westborough | 100 | Middlesex County |
| Farmington River Reg Elem School | MA1225040 | NTNCWS | Otis | 225 | Berkshire County |
| Fields At Sherborn Condo Trust | MA3269032 | CWS | Boston | 110 | Middlesex County |
| First Church Congregational | MA3038011 | NTNCWS | Boxford | 50 | Essex County |
| First Congregational Church | MA4240007 | NTNCWS | Plympton | 55 | Plymouth County |
| Five Oaks Investments Llc | MA4052049 | NTNCWS | North Carver | 100 | Plymouth County |
| Florence Sawyer School | MA2034024 | NTNCWS | Bolton | 873 | Worcester County |
| Four Mile Village | MA3038001 | CWS | Boxford | 133 | Essex County |
| Foxglove Apartments | MA2125013 | CWS | New Ipswich | 40 | Worcester County |
| Freetown Elementary School | MA4102008 | NTNCWS | Freetown | 501 | Bristol County |
| Freetown Water Commission | MA4102035 | CWS | Assonet | 1,600 | Bristol County |
| Freetown/Lakeville Regional School Dist. | MA4146016 | NTNCWS | Lakeville | 1,991 | Plymouth County |
| Gabriel Abbott Memorial School | MA1098004 | NTNCWS | North Adams | 150 | Berkshire County |
| Gale Brook School | MA1223010 | NTNCWS | Greenfield | 50 | Franklin County |
| Garrison Place Condominium Trust | MA3051022 | CWS | Chelmsford | 32 | Middlesex County |
| Gateway Regional School | MA1143003 | NTNCWS | Huntington | 730 | Hampshire County |
| Gilbertville Water District | MA1124001 | CWS | Gilbertville | 1,089 | Worcester County |
| Gill Elementary School | MA1106004 | NTNCWS | Turners Falls | 155 | Franklin County |
| Glen Ridge Residents Trust | MA3078002 | CWS | Dover | 131 | Norfolk County |
| Gosnold Water Dept | MA4109000 | CWS | Gosnold | 425 | Dukes County |
| Gould Farm | MA1193003 | CWS | Monterey | 93 | Berkshire County |
| Granby Heights Condominiums | MA1111003 | CWS | West Springfield | 152 | Hampshire County |
| Granby Housing Authority | MA1111002 | CWS | Granby | 61 | Hampshire County |
| Granby Jr Sr High And East Meadow School | MA1111006 | NTNCWS | Granby | 870 | Hampshire County |
| Granville Centre Water Co | MA1112000 | CWS | Granville | 70 | Hampden County |
| Granville Village School | MA1112006 | NTNCWS | Granville | 100 | Hampden County |
| Greathorse Country Club | MA1120008 | NTNCWS | Enfield | 201 | Hampden County |
| Green Acres Daycare Center, Inc. | MA2287012 | NTNCWS | Sturbridge | 55 | Worcester County |
| Green Meadows School | MA1120011 | NTNCWS | Wilbraham | 321 | Hampden County |
| Greylock Estates Homeowners Association | MA1148008 | CWS | Lanesborough | 25 | Berkshire County |
| Griswoldville Water District | MA1066001 | CWS | Colrain | 125 | Franklin County |
| Growing Footprints Education Center | MA2054072 | NTNCWS | Charlton | 55 | Worcester County |
| Hale Middle School | MA2286005 | NTNCWS | Bolton | 321 | Middlesex County |
| Hampden Housing Authority | MA1120002 | CWS | Hampden | 59 | Hampden County |
| Hampden Town Hall | MA1120006 | NTNCWS | Hampden | 270 | Hampden County |
| Hampshire Franklin Childrens Day Care | MA1154004 | NTNCWS | North Amherst | 29 | Franklin County |
| Hampshire Regional High School | MA1331003 | NTNCWS | Westhampton | 847 | Hampshire County |
| Hancock Elementary School | MA1121009 | NTNCWS | Hancock | 50 | Berkshire County |
| Hanscom Family Housing (Landings) | MA3157001 | CWS | El Paso | 3,067 | Middlesex County |
| Harborside Village | MA4318040 | CWS | Wellfleet | 165 | Barnstable County |
| Hardwick Center Water District | MA1124000 | CWS | Gilbertville | 80 | Worcester County |
| Hardwick Elementary School | MA1124008 | NTNCWS | Barre | 194 | Worcester County |
| Harry Lee Cole School | MA3038009 | NTNCWS | Boxford | 439 | Essex County |
| Harvard Forest | MA1234001 | NTNCWS | Petersham | 80 | Worcester County |
| Harvard Green Condominiums | MA2125014 | CWS | Harvard | 150 | Worcester County |
| Harvard Ridge Condominium | MA2037002 | CWS | Bedford | 350 | Middlesex County |
| Harvard Water Department | MA2125000 | CWS | Harvard | 1,422 | Worcester County |
| Hawlemont Regional School | MA1053007 | NTNCWS | Charlemont | 210 | Franklin County |
| Henry P. Clough School | MA2179005 | NTNCWS | Mendon | 460 | Worcester County |
| Heritage Association | MA1311002 | CWS | Warren | 158 | Worcester County |
| Heron Pond At Stockbridge | MA1283017 | CWS | Stockbridge | 50 | Berkshire County |
| Herring Cove Condominiums Trust | MA4239049 | CWS | Plymouth | 25 | Plymouth County |
| High Lawn Farm | MA1150003 | CWS | Lee | 43 | Berkshire County |
| Highland Ridge Condominiums | MA2028022 | CWS | Berlin | 132 | Worcester County |
| Hillcrest Water District | MA2151002 | CWS | Leicester | 1,500 | Worcester County |
| Hillside Heights Of Granby | MA1111039 | CWS | Granby | 30 | Hampshire County |
| Hilltown Community Development Corp | MA1060006 | NTNCWS | Chesterfield | 45 | Hampshire County |
| Hinsdale Water Dept | MA1132000 | CWS | Hinsdale | 1,000 | Berkshire County |
| Holland Elementary School | MA1135003 | NTNCWS | Holland | 232 | Hampden County |
| Holmes Park Water District | MA2332001 | CWS | Westminster | 131 | Worcester County |
| Hopkinton Country Club | MA2139003 | NTNCWS | Hopkinton | 200 | Middlesex County |
| Horton Estates Condominium Trust, Inc. | MA4247055 | CWS | Houston | 64 | Bristol County |
| Housatonic Water Works | MA1113003 | CWS | Great Barrington | 1,391 | Berkshire County |
| Hubbardston Center School | MA2140004 | NTNCWS | Barre | 316 | Worcester County |
| Hubbardston House Apartments | MA2140010 | CWS | Worcester | 40 | Worcester County |
| Huntington Water Dept | MA1143000 | CWS | Huntington | 2,180 | Hampshire County |
| Hutchinson Water Llc | MA1058001 | CWS | Grafton | 400 | Berkshire County |
| Immaculate Heart Of Mary School | MA2125011 | NTNCWS | Still River | 110 | Worcester County |
| Imperial Auto | MA2179016 | NTNCWS | Mendon | 120 | Worcester County |
| Imperial Plaza | MA2179022 | NTNCWS | Mendon | 200 | Worcester County |
| Island Childrens School | MA4296015 | NTNCWS | West Tisbury | 36 | Dukes County |
| Jacobs Pillow Dance Festival | MA1022026 | NTNCWS | Becket | 750 | Berkshire County |
| Jakes Path Pws | MA4182018 | CWS | Middleborough | 168 | Plymouth County |
| Jiminy Peak Resort | MA1121004 | CWS | Hancock | 1,000 | Berkshire County |
| John Road Industrial Park | MA2290024 | NTNCWS | Wakefield | 25 | Worcester County |
| Js Bryant School | MA1069012 | NTNCWS | Cummington | 65 | Hampshire County |
| Juniper Hill Water Company | MA2286000 | CWS | Stow | 220 | Middlesex County |
| Karl Storz Endovision, Inc. | MA2054051 | NTNCWS | Charlton | 550 | Worcester County |
| Kids A Lot (Daycare) | MA2286023 | NTNCWS | Stow | 145 | Middlesex County |
| Kings Grant Water Co Inc | MA4211001 | CWS | Attleboro | 434 | Bristol County |
| Klondike Campground | MA1225017 | NTNCWS | Great Barrington | 65 | Berkshire County |
| Koch Rt2 Toyota / Mysa | MA2147009 | NTNCWS | Lancaster | 50 | Worcester County |
| Kuehns Way Llc | MA4296018 | CWS | West Tisbury | 80 | Dukes County |
| Lake Point Village | MA4146004 | CWS | Carver | 66 | Plymouth County |
| Lancaster County Road Llc | MA2125012 | NTNCWS | Newton | 50 | Worcester County |
| Lancaster Woods Condominiums | MA2147008 | CWS | Westborough | 120 | Worcester County |
| Lanesborough Fire And Water District | MA1148000 | CWS | Lanesborough | 2,342 | Berkshire County |
| Laurel Hill Condominiums | MA2110006 | CWS | Grafton | 64 | Worcester County |
| Lees Supermarket | MA4334008 | NTNCWS | Westport | 90 | Bristol County |
| Leicester Water Supply District | MA2151000 | CWS | Leicester | 3,200 | Worcester County |
| Leino Park Water District | MA2332005 | CWS | Westminster | 120 | Worcester County |
| Leland Farms | MA3269028 | CWS | Sherborn | 25 | Middlesex County |
| Leverett Elementary School | MA1154001 | NTNCWS | Leverett | 217 | Franklin County |
| Lfb Usa 92 (Rabbit) | MA2054075 | NTNCWS | Framingham | 25 | Worcester County |
| Lfb Usa, Inc. | MA2054029 | NTNCWS | Spencer | 16 | Worcester County |
| Liberty House Condominium | MA2037014 | CWS | Acton | 80 | Middlesex County |
| Liberty Manor Inc | MA1329009 | CWS | Westfield | 500 | Hampden County |
| Lilac Hedge Farm | MA2257010 | NTNCWS | Berlin | 40 | Worcester County |
| Linda Manor Nursing Home | MA1214001 | CWS | Leeds | 120 | Hampshire County |
| Linden Ponds | MA4131005 | CWS | Hingham | 384 | Plymouth County |
| Litecontrol Corporation | MA4240001 | NTNCWS | Plympton | 160 | Plymouth County |
| Little Peoples College | MA4003009 | NTNCWS | Acushnet | 50 | Bristol County |
| Lkq Rt. 16 Used Auto Parts, Inc. | MA2316002 | NTNCWS | Webster | 76 | Worcester County |
| Long Pond Realty Trust | MA4239051 | CWS | Plymouth | 90 | Plymouth County |
| M.V. Public Charter School | MA4296011 | NTNCWS | West Tisbury | 150 | Dukes County |
| Madden Estates | MA2323002 | CWS | West Brookfield | 50 | Worcester County |
| Maillet Woods Condominiums | MA2139011 | CWS | Hopkinton | 55 | Middlesex County |
| Manchaug Water District Of Sutton | MA2290001 | CWS | Manchaug | 476 | Worcester County |
| Maplebrook Apartments | MA2226009 | CWS | Oxford | 33 | Worcester County |
| Marketplace Square Llc. | MA4052056 | NTNCWS | Brockton | 100 | Plymouth County |
| Marthas Vineyard Airport | MA4296004 | NTNCWS | Vineyard Haven | 750 | Dukes County |
| Masac Plymouth | MA4239010 | CWS | Milford | 210 | Plymouth County |
| Massachusetts State Police Academy | MA2202001 | NTNCWS | New Braintree | 200 | Worcester County |
| Massasoit Hills Trailer Park | MA4318056 | CWS | South Wellfleet | 120 | Barnstable County |
| Masters Academy International | MA2286016 | CWS | Stow | 225 | Middlesex County |
| Maynard State Llc | MA4334078 | CWS | Swansea | 35 | Bristol County |
| Mci Bridgewater | MA4042001 | CWS | Milford | 2,802 | Plymouth County |
| Meadow Woods Estate Homeowners Assn, Inc | MA4052054 | CWS | Carver | 120 | Plymouth County |
| Meadowbrook Acres Mobile Home Park | MA1043001 | CWS | Nashua | 137 | Hampden County |
| Meadowbrook Village Condominiums | MA2028012 | CWS | Boylston | 150 | Worcester County |
| Meadowbrook Water Trust | MA3078005 | CWS | Dover | 57 | Norfolk County |
| Memorial Dr. Ind. Park Site 1 (Rigr) | MA2271003 | NTNCWS | Shrewsbury | 52 | Worcester County |
| Memorial Dr. Ind. Park Site 2 (Rifl) | MA2271004 | NTNCWS | Shrewsbury | 78 | Worcester County |
| Mendon Housing Authority | MA2179001 | CWS | Mendon | 31 | Worcester County |
| Mendon Town Hall Campus | MA2179027 | NTNCWS | Mendon | 25 | Worcester County |
| Mendon Water Department | MA2179000 | CWS | Mendon | 470 | Worcester County |
| Menemsha Water Company | MA4062000 | CWS | Chilmark | 841 | Dukes County |
| Merrohawke Nature School | MA3038027 | NTNCWS | Boxford | 50 | Essex County |
| Metrowest Ymca | MA2139001 | NTNCWS | Framingham | 700 | Middlesex County |
| Micro Mech | MA3144008 | NTNCWS | Ipswich | 60 | Essex County |
| Mill River Water Takers Association | MA1203000 | CWS | Mill River | 150 | Berkshire County |
| Millbury Ind. Park/ Park Hill Village | MA2186001 | CWS | Millbury | 400 | Worcester County |
| Millville Elementary School | MA2188004 | NTNCWS | Millville | 400 | Worcester County |
| Miscoe Hill Middle School | MA2179004 | NTNCWS | Mendon | 760 | Worcester County |
| Mit Haystack Observatory | MA3301023 | NTNCWS | Cambridge | 40 | Middlesex County |
| Mit Millstone Laboratory | MA3301034 | NTNCWS | Cambridge | 25 | Middlesex County |
| Mohawk Trail Regional High School | MA1047000 | NTNCWS | Buckland | 550 | Franklin County |
| Monroe Water District | MA1190000 | CWS | Monroe | 55 | Franklin County |
| Montague Center Water District | MA1192003 | CWS | Montague | 450 | Franklin County |
| Monterey Water Company | MA1193000 | CWS | Monterey | 138 | Berkshire County |
| Monument Mtn Regional Hs | MA1113016 | NTNCWS | Stockbridge | 1,700 | Berkshire County |
| Mount St Marys Abbey | MA4350003 | CWS | Wrentham | 60 | Norfolk County |
| Mullein Hill Christian Academy | MA4146029 | NTNCWS | Lakeville | 125 | Plymouth County |
| Mwra | MA6000000 | CWS | Chelsea | 2,580,000 | Suffolk County |
| Nanatomqua Mobile Home Park | MA2045001 | CWS | Brookfield | 123 | Worcester County |
| Nashoba Park | MA2034025 | NTNCWS | Bolton | 30 | Worcester County |
| Nashoba Regional High School | MA2034010 | NTNCWS | Bolton | 1,057 | Worcester County |
| National Technical Systems | MA2037033 | NTNCWS | Boxborough | 25 | Middlesex County |
| Nemasket Health Care Center | MA4182015 | CWS | Eddyville | 90 | Plymouth County |
| New Braintree Grade School | MA2202004 | NTNCWS | New Braintree | 85 | Worcester County |
| New England Equities Llc | MA1120035 | NTNCWS | Tappan | 25 | Hampden County |
| New England Laborers Training Academy | MA2139002 | NTNCWS | Hopkinton | 200 | Middlesex County |
| New Hingham Regional Elementary School | MA1060004 | NTNCWS | Chesterfield | 189 | Hampshire County |
| New Marlborough Central School | MA1203011 | NTNCWS | Sheffield | 111 | Berkshire County |
| Noquochoke Village Llc | MA4334092 | CWS | Boston | 180 | Bristol County |
| North Carver Water System | MA4052072 | CWS | Carver | 300 | Plymouth County |
| North Dighton Fire District | MA4076002 | CWS | North Dighton | 1,300 | Bristol County |
| North End Mazda And Subaru | MA2162011 | NTNCWS | Acton | 63 | Worcester County |
| Northbrook Village I / Berlin Ret. | MA2028007 | CWS | Berlin | 48 | Worcester County |
| Northbrook Village Ii | MA2028018 | CWS | Wellesley | 80 | Worcester County |
| Northfield Mt Hermon School | MA1106002 | CWS | Mount Hermon | 750 | Franklin County |
| Northfield Mtn Station Visitor Center | MA1217003 | NTNCWS | Northfield | 140 | Franklin County |
| Northfield Water District | MA1217000 | CWS | Northfield | 800 | Franklin County |
| Oakham Country Day School | MA2222004 | NTNCWS | Oakham | 35 | Worcester County |
| Oakham Elementary School | MA2222001 | NTNCWS | Oakham | 149 | Worcester County |
| Old Colony Reg.Voc.Tech. High Sch. | MA4250003 | NTNCWS | Rochester | 400 | Plymouth County |
| Old Farm Road Water Trust | MA3078001 | CWS | Dover | 40 | Norfolk County |
| Oldcastle Apg | MA4247052 | NTNCWS | Rehoboth | 25 | Bristol County |
| One School Global | MA2186005 | NTNCWS | Millbury | 50 | Worcester County |
| Oronoque Condominium Trust | MA1283019 | CWS | Pittsfield | 25 | Berkshire County |
| Out Water Llc | MA2147011 | NTNCWS | Lancaster | 25 | Worcester County |
| Paddock Estates | MA2037036 | CWS | Boxborough | 463 | Middlesex County |
| Pan Am Southern Railroad | MA1074007 | CWS | East Deerfield | 120 | Franklin County |
| Paragon Communications | MA2034001 | NTNCWS | Bolton | 210 | Worcester County |
| Pequot Highlands | MA3258001 | CWS | Portland | 900 | Essex County |
| Petersham Center School | MA1234006 | NTNCWS | Petersham | 155 | Worcester County |
| Phillipston Memorial Building | MA2235002 | NTNCWS | Phillipston | 50 | Worcester County |
| Piconics | MA3301019 | NTNCWS | Tyngsborough | 40 | Middlesex County |
| Pilot Grove Apartments | MA2286018 | CWS | Stow | 175 | Middlesex County |
| Pilot Grove Apartments Ii | MA2286031 | CWS | Stow | 134 | Middlesex County |
| Pilot Travel Center | MA2287024 | NTNCWS | Knoxville | 3,000 | Worcester County |
| Pine Hill Condominium | MA2002010 | CWS | Worcester | 95 | Middlesex County |
| Pine Hill Elementary School | MA3269011 | NTNCWS | Dover | 480 | Middlesex County |
| Pine Hill Village Condominiums | MA2125025 | CWS | Tyngsborough | 100 | Worcester County |
| Pine Ridge Condominiums At Sampsons Pond | MA4052074 | CWS | Raynham | 89 | Plymouth County |
| Pine Valley Plantation | MA1024002 | CWS | Belchertown | 600 | Hampshire County |
| Pinecroft School | MA4247004 | NTNCWS | Rehoboth | 50 | Bristol County |
| Pinetree Village | MA4052025 | CWS | Carver | 348 | Plymouth County |
| Pinewood On The Green Condos | MA2226011 | CWS | Boylston | 50 | Worcester County |
| Pioneer Valley Regional School | MA1217002 | NTNCWS | Northfield | 500 | Franklin County |
| Plaza @ Pondview Place Llc | MA3301043 | NTNCWS | Tyngsborough | 30 | Middlesex County |
| Pleasant Water | MA4318091 | CWS | South Yarmouth | 200 | Barnstable County |
| Plymouth So.Elem.Sch. | MA4239017 | NTNCWS | North Plymouth | 950 | Plymouth County |
| Plymouth South High School | MA4239046 | NTNCWS | North Plymouth | 2,875 | Plymouth County |
| Pond Ridge Condo Assn | MA1289002 | CWS | Sunderland | 88 | Franklin County |
| Post Office Place | MA2241015 | NTNCWS | Princeton | 85 | Worcester County |
| Precious Beginnings | MA3078010 | NTNCWS | Dover | 44 | Norfolk County |
| Prima Care (Klrc Realy Trust) | MA4334083 | NTNCWS | Fall River | 25 | Bristol County |
| Prindle Pond Conference Center | MA2054053 | NTNCWS | Charlton | 305 | Worcester County |
| Quabbin Adult Medicine | MA1024012 | NTNCWS | Springfield | 25 | Hampshire County |
| Quabbin Sunrise Cooperative Inc | MA1309001 | CWS | Ware | 65 | Hampshire County |
| Randolph/Holbrook Joint Water Board | MA4244001 | CWS | Holbrook | 46,519 | Norfolk County |
| Ranor Incorporated | MA2332003 | NTNCWS | Westminster | 115 | Worcester County |
| Rediker Software | MA1120033 | NTNCWS | Hampden | 65 | Hampden County |
| Regency At Bolton Condominiums | MA2034030 | CWS | Westborough | 148 | Worcester County |
| Regency At Stow Condominiums | MA2286033 | CWS | Bedford | 132 | Middlesex County |
| Richmond Consolidated School | MA1249004 | NTNCWS | Richmond | 250 | Berkshire County |
| River Crossing Condominium | MA3301002 | CWS | Lowell | 150 | Middlesex County |
| Riverbridge | MA2028020 | CWS | Brewster | 1,330 | Worcester County |
| Riverside Water District | MA1106000 | CWS | Gill | 341 | Franklin County |
| Rochester Memorial School | MA4250002 | NTNCWS | Rochester | 688 | Plymouth County |
| Rockwood Meadows | MA2303004 | CWS | Worcester | 110 | Worcester County |
| Rowe Elementary School | MA1253007 | NTNCWS | Rowe | 88 | Franklin County |
| Royalston Community School | MA1255004 | NTNCWS | Athol | 200 | Worcester County |
| Rupp Realty Trust | MA3205021 | NTNCWS | Newbury | 40 | Essex County |
| Russell Water Dept | MA1256000 | CWS | Russell | 1,228 | Hampden County |
| Sacred Heart Early Childhood Center | MA4145007 | NTNCWS | Kingston | 120 | Plymouth County |
| Sacred Heart Elementary School | MA4145003 | NTNCWS | Kingston | 250 | Plymouth County |
| Saint Josephs Abbey | MA2280002 | CWS | Spencer | 45 | Worcester County |
| Salem And Beverly Water Supply Board | MA3030001 | CWS | Beverly | 90,330 | Essex County |
| Sanderson Academy | MA1013001 | NTNCWS | Ashfield | 170 | Franklin County |
| Savoy Elementary School | MA1263003 | NTNCWS | North Adams | 90 | Berkshire County |
| Sawyer Hill Ecovillage | MA2028017 | CWS | Berlin | 272 | Worcester County |
| Scantic Valley Water District | MA1120023 | CWS | Hampden | 100 | Hampden County |
| Schooner Pass Trustees Condominiums | MA4036011 | CWS | Raynham | 136 | Barnstable County |
| Scotts Grove Llc | MA4296017 | CWS | West Tisbury | 36 | Dukes County |
| Sea Oaks Condominiums | MA4172033 | CWS | Barnstable | 222 | Barnstable County |
| Semass Resource Recovery Facility | MA4250007 | NTNCWS | West Wareham | 45 | Plymouth County |
| Shaker Place Offices | MA2125020 | NTNCWS | Manchester | 50 | Worcester County |
| Shelburne Falls Fire District | MA1268000 | CWS | Shelburne Falls | 1,806 | Franklin County |
| Sherborn Town Offices; Police; Library | MA3269019 | NTNCWS | Sherborn | 25 | Middlesex County |
| Shutesbury Elementary School | MA1272002 | NTNCWS | Shutesbury | 285 | Franklin County |
| Siasconset Water Department | MA4197001 | CWS | Nantucket | 3,000 | Nantucket County |
| Silver Meadow | MA1306006 | CWS | Springfield | 25 | Hampden County |
| Silver Spruce Montessori School | MA2110002 | NTNCWS | Grafton | 85 | Worcester County |
| Silverleaf Hollow Condominiums | MA2140011 | CWS | Hubbardston | 40 | Worcester County |
| South Ashmere Water Association Inc | MA1132002 | CWS | Hockessin | 150 | Berkshire County |
| South Grafton Water District | MA2110001 | CWS | South Grafton | 3,262 | Worcester County |
| South Meadow Village | MA4052001 | CWS | Carver | 750 | Plymouth County |
| South Royalston Improvement Corp | MA1255000 | CWS | Royalston | 275 | Worcester County |
| Southern Worc. County Ed. Collaborative | MA2080004 | NTNCWS | Charlton | 60 | Worcester County |
| Southfield Redevelopement Authority | MA4336007 | CWS | Weymouth | 2,300 | Norfolk County |
| Southfield Water Company | MA1203002 | CWS | Southfield | 80 | Berkshire County |
| Southwicks Zoo | MA2179011 | NTNCWS | Mendon | 1,000 | Worcester County |
| Spofford Pond School | MA3038008 | NTNCWS | Boxford | 486 | Essex County |
| Sports Haven Mobile Home Park | MA1024001 | CWS | Belchertown | 107 | Hampshire County |
| Spring Hill Wellness | MA2012008 | NTNCWS | Ashby | 48 | Middlesex County |
| Staffordshire Country Estates | MA2151009 | CWS | Cherry Valley | 140 | Worcester County |
| Sterling Nursery School | MA2282006 | NTNCWS | Sterling | 150 | Worcester County |
| Stiles And Hart Brick Company | MA4042003 | NTNCWS | Bridgewater | 45 | Plymouth County |
| Still Meadow Village Condominiums | MA2115009 | CWS | Groton | 50 | Middlesex County |
| Stockbridge Water Dept | MA1283003 | CWS | Stockbridge | 2,800 | Berkshire County |
| Stones Throw Condos | MA4300040 | CWS | North Truro | 80 | Barnstable County |
| Stow Center School | MA2286007 | NTNCWS | Bolton | 644 | Middlesex County |
| Stow Fire And Community Center | MA2286006 | NTNCWS | Stow | 50 | Middlesex County |
| Stow Industrial (Flb Incorporated) | MA2286019 | NTNCWS | Westford | 25 | Middlesex County |
| Stow Municipal Buildings | MA2286022 | NTNCWS | Stow | 30 | Middlesex County |
| Stow Shopping Center | MA2286003 | NTNCWS | Marlborough | 100 | Middlesex County |
| Sturbridge Crossing Condominium | MA2287025 | CWS | Sturbridge | 52 | Worcester County |
| Sturbridge Retirement Coop. Corp. | MA2287020 | CWS | Sturbridge | 350 | Worcester County |
| Summer Village | MA3330025 | NTNCWS | Newton | 1,000 | Middlesex County |
| Sunderland Water District | MA1289000 | CWS | Sunderland | 3,190 | Franklin County |
| Sunset Ridge Condominiums | MA2034028 | CWS | Westborough | 42 | Worcester County |
| Sutton Public Schools | MA2290009 | NTNCWS | Sutton | 1,700 | Worcester County |
| Sweet Farm Homeowners Association | MA1341030 | CWS | Williamstown | 25 | Berkshire County |
| Sweet Wood Retirement Community | MA1341003 | CWS | Williamstown | 200 | Berkshire County |
| Swift River | MA1069003 | NTNCWS | Brentwood | 250 | Hampshire County |
| Swift River Elementary School | MA1204001 | NTNCWS | New Salem | 180 | Franklin County |
| Sysco Boston, Llc | MA4240005 | NTNCWS | Plympton | 350 | Plymouth County |
| Tewksbury Hospital | MA3295001 | CWS | Tewksbury | 2,500 | Middlesex County |
| The Academy At Charlemont | MA1053024 | NTNCWS | Charlemont | 100 | Franklin County |
| The Appleworks | MA2125007 | NTNCWS | Boston | 36 | Worcester County |
| The Childrens Garden Nursery School | MA2012007 | NTNCWS | Ashby | 54 | Middlesex County |
| The Home For Little Wanderers | MA4239030 | NTNCWS | Plymouth | 50 | Plymouth County |
| The International | MA2034004 | NTNCWS | Bolton | 100 | Worcester County |
| The Macduffie School | MA1111001 | CWS | Granby | 305 | Hampshire County |
| The Meeting House @ Stow Condo | MA2286012 | CWS | Stow | 92 | Middlesex County |
| The New Testament Church | MA4239003 | NTNCWS | Plymouth | 150 | Plymouth County |
| The Preserve At Hopkinton Condo | MA2139008 | CWS | Boylston | 80 | Middlesex County |
| The Quabbin Retreat | MA1234003 | NTNCWS | Needham | 40 | Worcester County |
| The Ranch Golf Club | MA1279003 | NTNCWS | Southwick | 200 | Hampden County |
| The Reserve At Spring Hill | MA4247061 | CWS | Rehoboth | 300 | Bristol County |
| The Taylor School | MA2037037 | NTNCWS | Boxborough | 50 | Middlesex County |
| The Village At Shepley Hill | MA2115012 | CWS | Sudbury | 52 | Middlesex County |
| Thomas Prince School | MA2241003 | NTNCWS | Princeton | 401 | Worcester County |
| Thorndike Fire And Water District | MA1227001 | CWS | Thorndike | 1,435 | Hampden County |
| Three Rivers Fire District | MA1227003 | CWS | Three Rivers | 3,258 | Hampden County |
| Toria Heights Condominium | MA2226007 | CWS | Oxford | 60 | Worcester County |
| Touchstone Community School | MA2110003 | NTNCWS | Grafton | 100 | Worcester County |
| Town Of Hubbardston Offices | MA2140015 | NTNCWS | Hubbardston | 25 | Worcester County |
| Town Of Westport | MA4334090 | CWS | Westport | 328 | Bristol County |
| Townhouses @ Copper Lantern | MA4052070 | CWS | Carver | 176 | Plymouth County |
| Trail Ridge Condominiums | MA2125016 | CWS | Worcester | 104 | Worcester County |
| Tri Town Water Board | MA4040002 | CWS | Braintree | 856,000 | Norfolk County |
| Twin Oaks Farm Learning Center Inc | MA4247056 | NTNCWS | Goshen | 30 | Bristol County |
| Tyngsboro Business Park Lot 1 | MA3301038 | NTNCWS | Tyngsborough | 100 | Middlesex County |
| Unified 2 Packaging Group | MA2147005 | NTNCWS | Lancaster | 50 | Worcester County |
| Unilock | MA2304019 | NTNCWS | Boston | 40 | Worcester County |
| Unitarian Universalist Area Church | MA3269003 | NTNCWS | Sherborn | 31 | Middlesex County |
| United Church Of Christ/Daycare | MA2037028 | NTNCWS | Boxborough | 100 | Middlesex County |
| V A Boston Healthcare System Brockton | MA4044013 | NTNCWS | Brockton | 1,500 | Plymouth County |
| Vacation Village In The Berkshires | MA1121010 | NTNCWS | Williamstown | 400 | Berkshire County |
| Vantage At Hampden | MA1120001 | CWS | Hampden | 100 | Hampden County |
| Verizon Business Network Services, Inc. | MA2054070 | NTNCWS | Charlton | 35 | Worcester County |
| Viant As And O Holding Llc | MA1043025 | NTNCWS | Brimfield | 90 | Hampden County |
| View Drive Water Association | MA1249008 | CWS | Richmond | 38 | Berkshire County |
| Village At Highland Park | MA2139007 | CWS | Whitinsville | 50 | Middlesex County |
| Village Nursery School | MA2125005 | NTNCWS | Harvard | 50 | Worcester County |
| Village School | MA1255005 | NTNCWS | Royalston | 42 | Worcester County |
| Villages At Stow | MA2286024 | CWS | Nashua | 300 | Middlesex County |
| Wachusett Mountain Ski Area | MA2241002 | NTNCWS | Princeton | 2,500 | Worcester County |
| Wagon Wheel Community, Inc. | MA2045004 | CWS | Brookfield | 228 | Worcester County |
| Wales Elementary School | MA1306004 | NTNCWS | Wales | 108 | Hampden County |
| Warren Water District | MA1311000 | CWS | Warren | 2,289 | Worcester County |
| Warwick Community School | MA1312012 | NTNCWS | Warwick | 100 | Franklin County |
| Washington Acres | MA1024015 | CWS | Belchertown | 30 | Hampshire County |
| Waterview Park Llc | MA4052044 | CWS | Plymouth | 102 | Plymouth County |
| Waubeeka Springs | MA1341004 | CWS | Williamstown | 50 | Berkshire County |
| Webco Chemical Corporation | MA2080003 | NTNCWS | Dudley | 75 | Worcester County |
| Wee Folk Farm Daycare | MA4003010 | NTNCWS | Acushnet | 25 | Bristol County |
| Wee Forest Folk | MA3051019 | NTNCWS | Carlisle | 25 | Middlesex County |
| Wellesley College | MA3317001 | CWS | Wellesley | 3,000 | Norfolk County |
| Wellfleet Apartments | MA4318107 | CWS | Orleans | 48 | Barnstable County |
| Wellfleet Municipal Water System | MA4318094 | CWS | Wellfleet | 750 | Barnstable County |
| West Brookfield Water Department | MA2323000 | CWS | West Brookfield | 3,217 | Worcester County |
| West Cummington Water Dept | MA1069002 | CWS | Cummington | 110 | Hampshire County |
| West Groton Water Supply District | MA2115001 | CWS | Groton | 1,853 | Middlesex County |
| West Parish Of Barnstable | MA4020020 | NTNCWS | West Barnstable | 75 | Barnstable County |
| West Stockbridge Water Dept | MA1326000 | CWS | West Stockbridge | 535 | Berkshire County |
| West Tisbury Elementary School | MA4296005 | NTNCWS | West Tisbury | 375 | Dukes County |
| West Warren Water District | MA1311001 | CWS | West Warren | 927 | Worcester County |
| Westhampton Elementary School | MA1331007 | NTNCWS | Westhampton | 148 | Hampshire County |
| Westover Arb | MA1061003 | NTNCWS | Chicopee | 950 | Hampden County |
| Westport Country Day School | MA4334073 | NTNCWS | Westport | 55 | Bristol County |
| Westport Harbor Water Association Inc | MA4334001 | NTNCWS | Westport | 200 | Bristol County |
| Westport Legion Llc | MA4334075 | NTNCWS | Fall River | 25 | Bristol County |
| Westport School Administration | MA4334012 | NTNCWS | Westport | 74 | Bristol County |
| Westport Schools Complex | MA4334094 | NTNCWS | Westport | 1,472 | Bristol County |
| Westport Senior Village | MA4334088 | CWS | Westport | 150 | Bristol County |
| Wheelwright Water District | MA1124002 | CWS | Wheelwright | 300 | Worcester County |
| White Birch Garden Apartments | MA1120015 | CWS | Chicopee | 25 | Hampden County |
| White Pines Condominiums | MA1283015 | CWS | Lenox | 225 | Berkshire County |
| Whitney Estates Condominiums | MA2028015 | CWS | Berlin | 40 | Worcester County |
| Wildwood Condominium | MA1108009 | CWS | Goshen | 25 | Hampshire County |
| Wilkinsonville Water District | MA2290014 | CWS | Sutton | 2,773 | Worcester County |
| Williamsburg Water Dept | MA1340000 | CWS | Haydenville | 1,575 | Hampshire County |
| Willows At Boxford | MA3038028 | CWS | Lexington | 132 | Essex County |
| Woodhaven Elder Housing Committee | MA3269002 | CWS | Sherborn | 30 | Middlesex County |
| Woodland Mhp Llc | MA1053030 | CWS | Charlemont | 36 | Franklin County |
| Woodland Ridge | MA2270009 | CWS | Leominster | 125 | Middlesex County |
| Woodland Walk Apartments | MA2054040 | CWS | Springfield | 76 | Worcester County |
| Woodward Village | MA3051023 | CWS | Concord | 54 | Middlesex County |
| Worthington Fire District | MA1349000 | CWS | Worthington | 565 | Hampshire County |
| Wrentham Developmental Center | MA4350001 | CWS | Wrentham | 937 | Norfolk County |