524 community and non-transient non-community water systems are listed for South Dakota in EPA SDWIS. 56 were sampled under UCMR 5; 7 of those had at least one PFAS result at or above the reporting level, and 2 had a highest single result at or above a 2024 EPA limit (PFOA or PFOS 4 ppt, or Hazard Index 1).
South Dakota 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 (56)
| System | PWSID | City | Population | Highest PFOA (ppt) | Highest PFOS (ppt) | Highest HI | Highest single result |
|---|---|---|---|---|---|---|---|
| Aberdeen | SD4600020 | Aberdeen | 27,989 | <MRL | <MRL | 0 | Other PFAS detected |
| Belle Fourche | SD4600037 | Belle Fourche | 5,617 | <MRL | <MRL | 0 | No PFAS detected |
| Big Sioux Community Water System | SD4600429 | Egan | 5,800 | <MRL | <MRL | 0 | No PFAS detected |
| Black Hawk Water User District | SD4600043 | Black Hawk | 4,500 | <MRL | <MRL | 0 | No PFAS detected |
| Box Elder | SD4600046 | Box Elder | 14,000 | <MRL | <MRL | 0 | No PFAS detected |
| Brandon | SD4600048 | Brandon | 11,048 | <MRL | <MRL | 0 | No PFAS detected |
| Brookings Municipal Utilities | SD4600071 | Brookings | 23,377 | <MRL | <MRL | 0 | No PFAS detected |
| Brookings-Deuel Rural Water System | SD4600430 | Toronto | 6,200 | <MRL | <MRL | 0 | No PFAS detected |
| Brown-Day-Marshall Rws | SD4600882 | Britton | 5,673 | <MRL | <MRL | 0 | No PFAS detected |
| By Water District | SD4600865 | Tabor | 13,320 | <MRL | <MRL | 0 | No PFAS detected |
| Clay Rural Water System | SD4600626 | Wakonda | 4,780 | <MRL | <MRL | 0 | No PFAS detected |
| Dell Rapids | SD4600105 | Dell Rapids | 3,633 | <MRL | <MRL | 0 | No PFAS detected |
| Eagle Butte | SD4600010 | Eagle Butte | 4,000 | <MRL | <MRL | 0 | No PFAS detected |
| Ellsworth Afb | SD4680004 | Ellsworth Afb | 9,100 | <MRL | <MRL | 0 | No PFAS detected |
| Grant-Roberts Rural Water System | SD4600864 | Milbank | 5,050 | <MRL | <MRL | 0 | No PFAS detected |
| Harrisburg | SD4600148 | Harrisburg | 10,297 | <MRL | <MRL | 0 | Other PFAS detected |
| Hot Springs | SD4600163 | Hot Springs | 3,395 | <MRL | <MRL | 0 | No PFAS detected |
| Huron | SD4600169 | Huron | 14,263 | <MRL | <MRL | 0 | No PFAS detected |
| Kingbrook I Rural Water System | SD4600431 | Arlington | 6,455 | <MRL | <MRL | 0 | No PFAS detected |
| Kyle Water System | 084690474 | Pine Ridge | 6,526 | <MRL | <MRL | 0 | No PFAS detected |
| Lincoln County Rural Water System | SD4600304 | Sioux Falls | 5,965 | <MRL | <MRL | 0 | Other PFAS detected |
| Madison | SD4600199 | Madison | 6,191 | <MRL | <MRL | 0 | No PFAS detected |
| Mid-Dakota Rural Water | SD4602175 | Miller | 11,833 | <MRL | <MRL | 0 | No PFAS detected |
| Minnehaha Community Water Corp | SD4600432 | Dell Rapids | 13,435 | <MRL | <MRL | 0 | No PFAS detected |
| Mission Water System | 084690532 | Mission | 2,500 | <MRL | <MRL | 0 | No PFAS detected |
| Mitchell | SD4600214 | Mitchell | 15,651 | <MRL | <MRL | 0 | No PFAS detected |
| Mobridge | SD4600215 | Mobridge | 3,261 | <MRL | <MRL | 0 | No PFAS detected |
| Nps-Mount Rushmore National Memorial | SD4680046 | Keystone | 4,100 | <MRL | 10.6 | 2.082 | PFOS 1–3 × its limit |
| Oglala Rws Pipeline | 084690480 | Pine Ridge | 3,562 | <MRL | <MRL | 0 | No PFAS detected |
| Philip | SD4600238 | Philip | 759 | <MRL | <MRL | 0 | No PFAS detected |
| Pierre | SD4600242 | Pierre | 14,091 | <MRL | <MRL | 0 | No PFAS detected |
| Pine Ridge Water System | 084690475 | Pine Ridge | 7,482 | <MRL | <MRL | 0 | No PFAS detected |
| Randall Community Water District | SD4600433 | Lake Andes | 6,248 | <MRL | <MRL | 0 | No PFAS detected |
| Rapid City | SD4600406 | Rapid City | 72,009 | <MRL | <MRL | 0.56 | Hazard Index below its limit |
| Rapid Valley Sanitary District | SD4600274 | Rapid City | 11,408 | <MRL | 5.7 | 0.58 | PFOS 1–3 × its limit |
| Rendezvous Ranch | SD4602210 | Black Hawk | 195 | <MRL | <MRL | 0 | No PFAS detected |
| Rosebud Rural Water System | 084690528 | Rosebud | 5,500 | <MRL | <MRL | 0 | No PFAS detected |
| Sicangu Mni Wiconi Rural Water System | 084690516 | Rosebud | 5,610 | <MRL | <MRL | 0 | No PFAS detected |
| Sioux Falls | SD4600294 | Sioux Falls | 216,462 | <MRL | <MRL | 0 | No PFAS detected |
| Sioux Rural Water System | SD4600866 | Watertown | 4,280 | <MRL | <MRL | 0 | No PFAS detected |
| South Lincoln Rural Water System | SD4600870 | Beresford | 5,250 | <MRL | <MRL | 0 | No PFAS detected |
| Spearfish | SD4600311 | Spearfish | 13,803 | <MRL | <MRL | 0 | No PFAS detected |
| St. Francis | 084690020 | Rosebud | 2,450 | <MRL | <MRL | 0 | No PFAS detected |
| Sturgis | SD4600321 | Sturgis | 7,020 | <MRL | <MRL | 0 | No PFAS detected |
| Sun Valley Development | SD4602270 | Rapid City | 650 | <MRL | <MRL | 0 | No PFAS detected |
| Tea | SD4600409 | Tea | 7,381 | <MRL | <MRL | 0 | No PFAS detected |
| Tm Rural Water District | SD4600999 | Parker | 4,250 | <MRL | <MRL | 0 | No PFAS detected |
| Tmt, Inc. | SD4602154 | Pierre | 250 | <MRL | <MRL | 0 | No PFAS detected |
| Tri-County Rural Water System | SD4600112 | Eagle Butte | 2,190 | <MRL | <MRL | 0 | No PFAS detected |
| Tripp County Water User District | SD4600520 | Winner | 4,860 | <MRL | <MRL | 0 | No PFAS detected |
| Vermillion | SD4600342 | Vermillion | 11,695 | <MRL | <MRL | 0 | No PFAS detected |
| Wall | SD4600417 | Wall | 699 | <MRL | <MRL | 0 | No PFAS detected |
| Watertown Municipal Utilities | SD4600356 | Watertown | 23,230 | <MRL | <MRL | 0 | No PFAS detected |
| Web Water Development Association | SD4601089 | Aberdeen | 20,750 | <MRL | <MRL | 0 | No PFAS detected |
| Wr/Lj - Mni Wiconi | SD4602223 | Murdo | 5,185 | <MRL | <MRL | 0 | Other PFAS detected |
| Yankton | SD4600423 | Yankton | 15,411 | <MRL | <MRL | 0 | No PFAS detected |
Not tested under UCMR 5 (468)
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 |
|---|---|---|---|---|---|
| 76 Ranch Estates | SD4602259 | CWS | Black Hawk | 40 | Lawrence County |
| Alcester | SD4600004 | CWS | Alcester | 820 | Union County |
| Alexandria | SD4600062 | CWS | Alexandria | 649 | Hanson County |
| Allen Water System | 084690481 | CWS | Pine Ridge | 420 | Bennett County |
| Alpena | SD4600025 | CWS | Miller | 212 | Jerauld County |
| American Horse School | 084690466 | CWS | Allen | 400 | Bennett County |
| Amherst Water Company | SD4600030 | CWS | Britton | 40 | Marshall County |
| Apple Springs Subdivision | SD4602318 | CWS | Hill City | 180 | Lawrence County |
| Ar Ranch | SD4602379 | CWS | Blackhawk | 88 | Meade County |
| Arlington | SD4600385 | CWS | Arlington | 915 | Kingsbury County |
| Armour | SD4600028 | CWS | Armour | 698 | Douglas County |
| Aurora | SD4600058 | CWS | Aurora | 1,200 | Brookings County |
| Aurora-Brule Rural Water System | SD4600621 | CWS | Kimball | 2,750 | Aurora County, Brule County, Buffalo County, Davison County, Douglas County, Jerauld County |
| Autumn Meadows Sanitary District | SD4602240 | CWS | Piedmont | 49 | Meade County |
| Avon | SD4600031 | CWS | Avon | 590 | Bon Homme County |
| B & J Mobile Home Park | SD4602122 | CWS | Rapid City | 135 | Pennington County |
| Badger | SD4600032 | CWS | Badger | 105 | Kingsbury County |
| Baltic | SD4600034 | CWS | Baltic | 1,271 | Minnehaha County |
| Batesland | SD4600036 | CWS | Martin | 148 | Oglala Lakota County |
| Bear Butte Valley Water | SD4602334 | CWS | Sturgis | 882 | Lawrence County, Meade County |
| Beresford | SD4600386 | CWS | Beresford | 2,359 | Lincoln County, Union County |
| Bestgen Addition Water Company | SD4600387 | CWS | Piedmont | 73 | Meade County |
| Bicentennial Trailer Court | SD4600426 | CWS | Spearfish | 23 | Lawrence County |
| Big Bend Water System | 084690438 | CWS | Fort Thompson | 80 | Hughes County |
| Big Stone City | SD4600007 | CWS | Big Stone City | 412 | Grant County |
| Bison | SD4600039 | CWS | Bison | 310 | Perkins County |
| Black Hills Children'S Home | SD4602121 | NTNCWS | Rapid City | 105 | Pennington County |
| Black Hills Water Distribution, Llc | SD4602144 | CWS | Belle Fourche | 135 | Butte County |
| Blucksberg Mountain #1 | SD4600324 | CWS | Piedmont | 223 | Meade County |
| Blucksberg Mountain #2 | SD4602366 | CWS | Piedmont | 333 | Meade County |
| Blumengard Colony | SD4602057 | CWS | Faulkton | 133 | Edmunds County, Faulk County |
| Blunt | SD4600044 | CWS | Miller | 350 | Hughes County |
| Bonesteel | SD4600045 | CWS | Bonesteel | 275 | Gregory County |
| Boulder Colony | SD4600339 | CWS | Hosmer | 26 | Edmunds County |
| Boulder Park Water Users Association | SD4602005 | CWS | Rapid City | 200 | Lawrence County |
| Bowdle | SD4600008 | CWS | Bowdle | 470 | Edmunds County |
| Boxelder Civilian Conservation Ctr | SD4680000 | NTNCWS | Nemo | 220 | Lawrence County |
| Boxelder High Country Association | SD4602276 | CWS | Rapid City | 45 | Meade County, Pennington County |
| Brentford | SD4600065 | CWS | Brentford | 88 | Spink County |
| Brentwood Colony | SD4602066 | CWS | Faulkton | 137 | Faulk County |
| Bridgewater | SD4600066 | CWS | Bridgewater | 511 | McCook County |
| Bridle Ridge Estates | SD4602362 | CWS | Piedmont | 38 | Meade County, Pennington County |
| Bristol | SD4600067 | CWS | Bristol | 288 | Day County |
| Britton | SD4600388 | CWS | Britton | 1,215 | Marshall County |
| Bryant | SD4600076 | CWS | Bryant | 471 | Hamlin County |
| Buffalo | SD4600078 | CWS | Buffalo | 346 | Harding County |
| Buffalo Gap | SD4600077 | CWS | Buffalo Gap | 126 | Custer County |
| Burke | SD4600079 | CWS | Burke | 575 | Gregory County |
| Butte-Meade Swd-Bean Well | SD4600223 | CWS | Newell | 1,481 | Butte County, Meade County |
| Butte-Meade Swd-Vale Well | SD4602314 | CWS | Newell | 357 | Butte County, Meade County |
| Camrose Colony | SD4602345 | CWS | Frankfort | 80 | Spink County |
| Canistota | SD4600080 | CWS | Canistota | 642 | McCook County |
| Canova | SD4600081 | CWS | Canova | 89 | Miner County |
| Canton | SD4600082 | CWS | Canton | 3,066 | Lincoln County |
| Canyon Springs Water And Sewer Distr | SD4602311 | CWS | Black Hawk | 163 | Pennington County |
| Carriage Hills | SD4600265 | CWS | Rapid City | 267 | Pennington County |
| Castlewood | SD4600002 | CWS | Castlewood | 698 | Hamlin County |
| Cavalry Trails Homeowner Association | SD4602106 | CWS | Piedmont | 44 | Pennington County |
| Cedar Gulch 1 | SD4602301 | CWS | Rapid City | 45 | Pennington County |
| Cedar Gulch 2 | SD4602295 | CWS | Piedmont | 40 | Pennington County |
| Centennial Hills Home Association | SD4602176 | CWS | Spearfish | 25 | Lawrence County |
| Centennial Vista Estates | SD4602280 | CWS | Black Hawk | 44 | Lawrence County, Meade County |
| Centerville | SD4600085 | CWS | Centerville | 918 | Turner County |
| Central Meade School | SD4602371 | NTNCWS | Sturgis | 80 | Meade County |
| Chamberlain | SD4600086 | CWS | Chamberlain | 2,473 | Brule County |
| Chancellor | SD4600087 | CWS | Chancellor | 266 | Turner County |
| Chapel Lane Water Company | SD4600264 | CWS | Rapid City | 1,200 | Pennington County |
| Chester Sanitary District | SD4600088 | CWS | Egan | 363 | Lake County |
| Chris' Mobile Home Court | SD4600439 | CWS | Spearfish | 25 | Lawrence County |
| Claremont | SD4600090 | CWS | Britton | 108 | Brown County |
| Clark | SD4600091 | CWS | Clark | 1,148 | Clark County |
| Clark Rural Water System | SD4600881 | CWS | Clark | 2,325 | Clark County, Codington County, Day County, Grant County, Hamlin County |
| Clark Rural Water-Kampeska | SD4602277 | CWS | Clark | 602 | Codington County, Day County |
| Clay Rws/South Union | SD4602185 | CWS | Wakonda | 1,447 | Union County |
| Clear Lake | SD4600092 | CWS | Clear Lake | 1,218 | Deuel County |
| Clearfield Colony | SD4602020 | CWS | Delmont | 120 | Charles Mix County, Douglas County |
| Coca Cola Bottling Co | SD4602150 | NTNCWS | Rapid City | 75 | Pennington County |
| Collins Colony | SD4602358 | CWS | Iroquois | 95 | Clark County, Kingsbury County |
| Colman | SD4600093 | CWS | Colman | 634 | Moody County |
| Colome | SD4600094 | CWS | Colome | 323 | Tripp County |
| Colonial Pine Hills Sanitary Distric | SD4600263 | CWS | Rapid City | 1,200 | Pennington County |
| Colton | SD4600390 | CWS | Colton | 738 | Minnehaha County |
| Conde | SD4600096 | CWS | Conde | 142 | Spink County |
| Copper Oaks I | SD4602136 | CWS | New Underwood | 64 | Pennington County |
| Corona | SD4600009 | CWS | Corona | 69 | Roberts County |
| Corsica | SD4600097 | CWS | Corsica | 561 | Douglas County |
| Country Club Estates | SD4600629 | CWS | Hot Springs | 83 | Fall River County |
| Country Road Estates | SD4602204 | CWS | Black Hawk | 112 | Pennington County |
| Country Village Park | SD4600021 | CWS | Aberdeen | 340 | Brown County |
| Crazy Horse School | 084690468 | CWS | Wanblee | 428 | |
| Cresbard | SD4600099 | CWS | Cresbard | 96 | Faulk County |
| Crooked Oaks Canyon Homeowners | SD4600915 | CWS | Black Hawk | 70 | Meade County |
| Crooks | SD4600391 | CWS | Crooks | 1,362 | Minnehaha County |
| Crow Creek Sioux Tribe Water System | 084690439 | CWS | Fort Thompson | 130 | Brule County, Buffalo County |
| Crow Creek Tribal School | 084690437 | CWS | Stephan | 516 | Hyde County |
| Custer | SD4600101 | CWS | Custer | 1,919 | Custer County |
| D & E Water Company | SD4600392 | CWS | Black Hawk | 100 | Lawrence County |
| Dakota Dunes Cid | SD4602093 | CWS | Dakota Dunes | 3,700 | Union County |
| Dallas | SD4600102 | CWS | Dallas | 89 | Gregory County |
| Darlington Estates | SD4600403 | CWS | Rapid City | 25 | Pennington County |
| Davison Rural Water System Inc | SD4601090 | CWS | Mitchell | 3,485 | Aurora County, Davison County, Douglas County, Hutchinson County, Sanborn County |
| De Smet | SD4600059 | CWS | De Smet | 1,056 | Kingsbury County |
| Deadwood | SD4600104 | CWS | Deadwood | 1,156 | Lawrence County |
| Deberg Well Users Association | SD4602095 | CWS | Spearfish | 54 | Lawrence County |
| Deer Mountain Sanitary District | SD4600549 | CWS | Lead | 125 | Lawrence County |
| Delmont | SD4600106 | CWS | Delmont | 153 | Douglas County |
| Doland | SD4600108 | CWS | Doland | 199 | Spink County |
| Dry Creek Estates | SD4602241 | CWS | Black Hawk | 233 | Meade County |
| Dupree | SD4600110 | CWS | Dupree | 525 | Ziebach County |
| Eagle Nest Homes | 084690025 | CWS | Pine Ridge | 195 | Jackson County |
| Eagle Water Company | SD4602307 | CWS | Black Hawk | 48 | Lawrence County |
| East Ridge Acres | SD4601000 | CWS | Rapid City | 118 | Meade County |
| East Winds Court, Inc. | SD4602099 | CWS | Yankton | 180 | Yankton County |
| Edelweiss Mountain Improvement Assoc | SD4600273 | CWS | Black Hawk | 70 | Pennington County |
| Eden | SD4600113 | CWS | Eden | 94 | Marshall County |
| Edgemont | SD4600114 | CWS | Edgemont | 725 | Fall River County |
| Egan | SD4600115 | CWS | Egan | 241 | Moody County |
| Elk Creek Valley View Assoc | SD4602363 | CWS | Rapid City | 52 | Meade County |
| Elk Creek Village | SD4602237 | CWS | Rapid City | 110 | Meade County |
| Elk Point | SD4600116 | CWS | Elk Point | 2,124 | Union County |
| Elk Valley Ranchettes | SD4602189 | CWS | Rapid City | 62 | Meade County |
| Elkton | SD4600117 | CWS | Elkton | 755 | Brookings County |
| Emery | SD4600118 | CWS | Emery | 480 | Hanson County |
| Enemy Swim Water System | 084690460 | CWS | Agency Village | 230 | Day County |
| Estelline | SD4600119 | CWS | Estelline | 749 | Hamlin County |
| Ethan | SD4600120 | CWS | Ethan | 320 | Davison County |
| Eureka | SD4600121 | CWS | Eureka | 813 | McPherson County |
| Evergreen Colony | SD4602050 | CWS | Faulkton | 121 | Faulk County |
| Fairburn Water Association | SD4600877 | CWS | Fairburn | 65 | Custer County |
| Faith | SD4600124 | CWS | Faith | 367 | Meade County |
| Fall River Wud | SD4602201 | CWS | Oral | 1,057 | Custer County, Fall River County |
| Faulkton | SD4600125 | CWS | Faulkton | 693 | Faulk County |
| Finley Heights Water System | 084690462 | CWS | Agency Village | 60 | Roberts County |
| Flandreau | SD4600127 | CWS | Flandreau | 2,372 | Moody County |
| Flandreau School | 084690465 | CWS | Flandreau | 375 | Moody County |
| Florence | SD4600128 | CWS | Florence | 337 | Codington County |
| Fordham Colony | SD4602064 | CWS | Carpenter | 142 | Clark County, Spink County |
| Fort Meade Va Center | SD4680002 | CWS | Fort Meade | 800 | Meade County |
| Fort Pierre | SD4600130 | CWS | Fort Pierre | 2,236 | Stanley County |
| Fort Thompson Water System | 084690440 | CWS | Fort Thompson | 1,375 | Buffalo County |
| Frederick | SD4600133 | CWS | Frederick | 215 | Brown County |
| Freeman | SD4600134 | CWS | Freeman | 1,329 | Hutchinson County |
| Fruitdale | SD4600135 | CWS | Fruitdale | 75 | Butte County |
| Garden City | SD4600137 | CWS | Garden City | 33 | Clark County |
| Garretson | SD4600138 | CWS | Garretson | 1,228 | Minnehaha County |
| Gary | SD4600139 | CWS | Gary | 240 | Deuel County |
| Gayville | SD4600140 | CWS | Gayville | 392 | Yankton County |
| Gcc Dacotah - East/West/North | SD4600643 | NTNCWS | Rapid City | 100 | Pennington County |
| Gcc Dacotah-North Quarry Well | SD4602070 | NTNCWS | Rapid City | 35 | Pennington County |
| Gettysburg | SD4600142 | CWS | Gettysburg | 1,162 | Potter County |
| Glendale Colony | SD4602060 | CWS | Frankfort | 95 | Spink County |
| Golden Hills Homes | SD4602213 | CWS | Rapid City | 47 | Pennington County |
| Golden Hills Subdivision | SD4602284 | CWS | Piedmont | 30 | Lawrence County |
| Golden Meadows | SD4600516 | CWS | Black Hawk | 96 | Meade County |
| Golden Valley Water Company | SD4602261 | CWS | Black Hawk | 283 | Meade County |
| Green Acres Association | SD4600425 | CWS | Bath | 55 | Brown County |
| Green Acres Water Corporation | SD4602218 | CWS | Hot Springs | 31 | Fall River County |
| Greenwood Colony | SD4602022 | CWS | Delmont | 85 | Charles Mix County, Douglas County |
| Gregory | SD4600145 | CWS | Gregory | 1,221 | Gregory County |
| Grenville | SD4600146 | CWS | Grenville | 48 | Day County |
| Groton | SD4600147 | CWS | Groton | 1,380 | Brown County |
| Hanson Rural Water System | SD4600878 | CWS | Emery | 2,685 | Davison County, Hanson County, McCook County |
| Happy Holiday Rv Resort | SD4600669 | CWS | Rapid City | 264 | Pennington County |
| Happy Holiday Water Association | SD4600420 | CWS | Rapid City | 35 | Pennington County |
| Hart Ranch | SD4600910 | CWS | Rapid City | 468 | Pennington County |
| Hartford | SD4600150 | CWS | Hartford | 3,396 | Minnehaha County |
| Hay Creek Water Company | SD4602143 | CWS | Belle Fourche | 323 | Butte County |
| Hayti | SD4600151 | CWS | Hayti | 393 | Hamlin County |
| Heartland Country Ranchettes | SD4602235 | CWS | Black Hawk | 95 | Custer County |
| Hecla | SD4600152 | CWS | Hecla | 200 | Brown County |
| Henry | SD4600153 | CWS | Henry | 256 | Codington County |
| Hermosa Water Users Association | SD4602180 | CWS | Hermosa | 108 | Custer County |
| Hermosa-Old System | SD4600154 | CWS | Hill City | 420 | Custer County |
| Herreid | SD4600155 | CWS | Herreid | 416 | Campbell County |
| Hidden Valley Water Association Inc | SD4600269 | CWS | Rapid City | 27 | Pennington County |
| High Meadows Ranchettes | SD4600011 | CWS | Black Hawk | 60 | Pennington County |
| High Meadows Water Company | SD4600395 | CWS | Black Hawk | 140 | Meade County |
| High Sheridan Ranch | SD4602234 | CWS | Black Hawk | 38 | Pennington County |
| Highland Hills | SD4600050 | CWS | Rapid City | 38 | Pennington County |
| Highmore | SD4600158 | CWS | Highmore | 682 | Hyde County |
| Hill City | SD4600159 | CWS | Hill City | 872 | Pennington County |
| Hisega Meadows Water Inc | SD4600271 | CWS | Rapid City | 493 | Pennington County |
| Hitchcock | SD4600161 | CWS | Miller | 112 | Beadle County |
| Horseshoe Acres Water Association | SD4602266 | CWS | Piedmont | 180 | Meade County |
| Hosmer | SD4600162 | CWS | Hosmer | 170 | Edmunds County |
| Hot Springs Va Center | SD4680003 | CWS | Hot Springs | 445 | Fall River County |
| Hoven | SD4600164 | CWS | Hoven | 346 | Potter County |
| Howard | SD4600165 | CWS | Howard | 848 | Miner County |
| Hudson | SD4600166 | CWS | Hudson | 332 | Lincoln County |
| Humboldt | SD4600167 | CWS | Humboldt | 579 | Minnehaha County |
| Hurley | SD4600168 | CWS | Hurley | 379 | Turner County |
| Huron Colony | SD4602042 | CWS | Huron | 95 | Beadle County |
| Hutterville Colony South Dakota Inc | SD4602026 | CWS | Stratford | 90 | Brown County |
| Ipswich | SD4600397 | CWS | Ipswich | 928 | Edmunds County |
| Irene | SD4600173 | CWS | Irene | 422 | Clay County, Turner County, Yankton County |
| Iroquois | SD4600174 | CWS | Iroquois | 292 | Beadle County, Kingsbury County |
| Isabel | SD4600175 | CWS | Isabel | 145 | Dewey County |
| Java | SD4600176 | CWS | Java | 121 | Walworth County |
| Jefferson | SD4600060 | CWS | Jefferson | 475 | Union County |
| Jobee Acres | SD4600019 | CWS | Aberdeen | 108 | Brown County |
| Kadoka | SD4600181 | CWS | Kadoka | 543 | Jackson County |
| Ken'S Trailer Court | SD4600314 | CWS | Spearfish | 110 | Lawrence County |
| Kennebec | SD4600182 | CWS | Kennebec | 265 | Lyman County |
| Keystone | SD4601082 | CWS | Keystone | 349 | Pennington County |
| Kimball | SD4600184 | CWS | Kimball | 572 | Brule County |
| Kingbrook Ii Rural Water System | SD4600511 | CWS | Arlington | 2,715 | Beadle County, Clark County, Hamlin County, Hanson County, Kingsbury County, McCook County, Miner County, Sanborn County |
| Kingbrook Iii Rural Water System | SD4600874 | CWS | Arlington | 2,973 | Lake County, McCook County, Miner County, Minnehaha County |
| Lake Andes | SD4600185 | CWS | Lake Andes | 710 | Charles Mix County |
| Lake Andes Tribal Housing Water System | 084690534 | CWS | Wagner | 264 | Charles Mix County |
| Lake City | SD4600186 | CWS | Britton | 45 | Marshall County |
| Lake Norden | SD4600187 | CWS | Lake Norden | 554 | Hamlin County |
| Lake Preston | SD4600398 | CWS | Lake Preston | 589 | Kingsbury County |
| Lakeside Estates | SD4600022 | CWS | Aberdeen | 460 | Brown County |
| Lakeside Water Users District | SD4602108 | CWS | Owanka | 51 | Pennington County |
| Lakeview Colony | SD4602017 | CWS | Lake Andes | 118 | Charles Mix County |
| Lakota Tech High School | SD4600332 | CWS | Batesland | 1,250 | Oglala Lakota County |
| Langford | SD4600189 | CWS | Langford | 283 | Marshall County |
| Lantern Estates | SD4600315 | CWS | Spearfish | 192 | Lawrence County |
| Laughing Water Restaurant At Crazy H | SD4600547 | NTNCWS | Crazy Horse | 2,055 | Custer County |
| Lead | SD4602164 | CWS | Lead | 2,982 | Lawrence County |
| Lead-Deadwood Sanitary District | SD4600190 | CWS | Deadwood | 0 | Lawrence County |
| Lemmon | SD4600192 | CWS | Lemmon | 1,156 | Perkins County |
| Lennox | SD4600193 | CWS | Lennox | 2,571 | Lincoln County |
| Leola | SD4600194 | CWS | Leola | 434 | McPherson County |
| Lesterville | SD4600195 | CWS | Lesterville | 115 | Yankton County |
| Letcher | SD4600196 | CWS | Letcher | 159 | Davison County, Sanborn County |
| Lewis And Clark Regional Water Syste | SD4602288 | CWS | Vermillion | 0 | Minnehaha County |
| Liberty Hills Community | SD4600518 | CWS | Hot Springs | 68 | Fall River County |
| Lofty Pines Ii | SD4602250 | CWS | Piedmont | 38 | Meade County |
| Long Hollow Water System | 084690457 | CWS | Agency Village | 265 | Roberts County |
| Long Lake Colony | SD4602051 | CWS | Westport | 107 | Brown County, McPherson County |
| Lourie Lane Homeowners Assoc | SD4600416 | CWS | Spearfish | 75 | Lawrence County |
| Lower Brule Rural Water Supply System | 084690441 | CWS | Lower Brule | 1,637 | Lyman County, Stanley County |
| Marion | SD4600201 | CWS | Marion | 894 | Turner County |
| Martin | SD4600202 | CWS | Martin | 1,500 | Bennett County |
| Marty Water System | 084690533 | CWS | Wagner | 420 | Charles Mix County |
| Marvin | SD4600203 | CWS | South Shore | 19 | Grant County |
| Maxwell Colony | SD4602023 | CWS | Scotland | 163 | Bon Homme County, Hutchinson County |
| Mcintosh | SD4600197 | CWS | Mcintosh | 111 | Corson County |
| Mclaughlin | SD4600198 | CWS | Mclaughlin | 569 | Corson County |
| Meadow Crest Sanitary District | SD4602258 | CWS | Spearfish | 63 | Lawrence County |
| Mellette | SD4600204 | CWS | Redfield | 205 | Spink County |
| Menno | SD4600205 | CWS | Menno | 614 | Hutchinson County |
| Midland | SD4600012 | CWS | Midland | 120 | Haakon County |
| Midland Heights | SD4600515 | CWS | Rapid City | 130 | Meade County |
| Milbank | SD4600207 | CWS | Milbank | 3,544 | Grant County |
| Milk`S Camp Water System | 084690498 | CWS | Rosebud | 50 | Gregory County |
| Miller | SD4600211 | CWS | Miller | 1,349 | Hand County |
| Mina Lake Sanitary District | SD4600501 | CWS | Aberdeen | 863 | Edmunds County |
| Mission Hill | SD4600212 | CWS | Gayville | 190 | Yankton County |
| Mni Wiconi Wtp / Coreline | 084690026 | CWS | Fort Pierre | 25 | Stanley County |
| Montrose | SD4600217 | CWS | Montrose | 468 | McCook County |
| Morristown | SD4600218 | CWS | Morristown | 47 | Corson County |
| Mount Vernon | SD4600220 | CWS | Mount Vernon | 461 | Davison County |
| Mountain Plains 2 Homeowners Assoc | SD4602169 | CWS | Spearfish | 268 | Lawrence County |
| Murdo | SD4600221 | CWS | Murdo | 475 | Jones County |
| New Effington | SD4600013 | CWS | New Effington | 247 | Roberts County |
| New Underwood | SD4600224 | CWS | New Underwood | 679 | Pennington County |
| Newdale Colony | SD4602081 | CWS | Elkton | 119 | Brookings County |
| Newell | SD4600222 | CWS | Newell | 583 | Butte County |
| Nisland | SD4600225 | CWS | Nisland | 206 | Butte County |
| Norris Peak Water Users Assoc | SD4602349 | CWS | Black Hawk | 30 | Pennington County |
| North Allen Water System | 084690030 | CWS | Pine Ridge | 65 | Bennett County |
| North Brookings Water And Sanitary D | SD4602377 | CWS | Brookings | 48 | Brookings County |
| North Hermosa Wud | SD4600329 | CWS | Hermosa | 40 | Custer County |
| North Martin Water System | 084690029 | CWS | Pine Ridge | 78 | Bennett County |
| North Sioux City | SD4600226 | CWS | North Sioux City | 3,042 | Union County |
| Northdale Sanitary District | SD4600514 | CWS | Piedmont | 1,075 | Meade County, Pennington County |
| Northville | SD4600227 | CWS | Northville | 143 | Spink County |
| Northwood First Subdivision | SD4602342 | CWS | Aberdeen | 90 | Brown County |
| Nps-Wind Cave National Park | SD4680047 | NTNCWS | Hot Springs | 1,404 | Custer County |
| Oacoma | SD4600229 | CWS | Oacoma | 391 | Lyman County |
| Oak Mountain Country Estates | SD4602151 | CWS | Black Hawk | 85 | Lawrence County |
| Oaks Water Users Association | SD4602135 | CWS | New Underwood | 180 | Pennington County |
| Oelrichs | SD4600230 | CWS | Oelrichs | 117 | Fall River County |
| Old Agency Water System | 084690458 | CWS | Agency Village | 1,180 | Roberts County |
| Onida | SD4600233 | CWS | Onida | 658 | Sully County |
| Our Lady Of Lourdes School | 084690521 | NTNCWS | Porcupine | 170 | |
| Owanka Rural Water System | SD4602310 | CWS | Black Hawk | 52 | Pennington County |
| Paradise Water Company Llc | SD4602323 | CWS | Lead | 178 | Lawrence County |
| Paramount Point | SD4602351 | CWS | Hot Springs | 40 | Custer County |
| Parker | SD4600235 | CWS | Parker | 1,025 | Turner County |
| Parkston | SD4600236 | CWS | Parkston | 1,567 | Hutchinson County |
| Peaceful Pines Ii | SD4602000 | CWS | Black Hawk | 71 | Meade County |
| Pearl Creek Colony | SD4602073 | CWS | Iroquois | 94 | Beadle County |
| Peever | SD4600237 | CWS | Britton | 140 | Roberts County |
| Peever Flats Water System | 084690461 | CWS | Agency Village | 129 | Roberts County |
| Perkins County Rural Water | SD4602228 | CWS | Bison | 470 | Harding County, Perkins County |
| Pickstown | SD4680001 | CWS | Pickstown | 230 | Charles Mix County |
| Piedmont | SD4602303 | CWS | Piedmont | 971 | Meade County |
| Pierpont | SD4600241 | CWS | Pierpont | 129 | Day County |
| Pierre Indian Learning Center | 084690027 | CWS | Pierre | 214 | Hughes County |
| Pillar Peak | SD4602326 | CWS | Black Hawk | 38 | Lawrence County |
| Pine Cliff Estates | SD4600270 | CWS | Black Hawk | 180 | Pennington County |
| Pine Cone Estates | SD4602179 | CWS | Piedmont | 42 | Meade County |
| Pine Grove | SD4600948 | CWS | Rapid City | 425 | Pennington County |
| Pine Hills Park | SD4600041 | CWS | Summerset | 200 | Meade County |
| Pine Lake Hills | SD4600624 | CWS | Sioux Falls | 320 | Minnehaha County |
| Pine Ridge Hospital | 084690485 | CWS | Pine Ridge | 316 | Oglala Lakota County |
| Pineview Water Association | SD4602153 | CWS | Rapid City | 25 | Pennington County |
| Plankinton | SD4600245 | CWS | Plankinton | 782 | Aurora County |
| Platte | SD4600246 | CWS | Platte | 1,256 | Charles Mix County |
| Pleasant Valley Colony | SD4602086 | CWS | Flandreau | 107 | Moody County |
| Pleasant Valley Estates | SD4600404 | CWS | Aberdeen | 105 | Brown County, Meade County |
| Pleasant Valley Homeowners Associati | SD4602172 | CWS | Piedmont | 48 | Meade County |
| Pollock | SD4600247 | CWS | Pollock | 229 | Campbell County |
| Ponderosa Mobile Home Ranch | SD4600260 | CWS | Rapid City | 150 | Pennington County |
| Ponderosa Park | SD4600405 | CWS | Rapid City | 50 | Pennington County |
| Ponderosa Ridge | SD4600863 | CWS | Rapid City | 98 | Pennington County |
| Ponderosa Water Company | SD4602134 | CWS | Rapid City | 25 | Pennington County |
| Potato Creek Water System | 084690472 | CWS | Pine Ridge | 95 | Jackson County |
| Prairie Acres Llc | SD4600014 | CWS | Rapid City | 350 | Pennington County |
| Prairie Acres North | SD4600884 | CWS | Rapid City | 288 | Pennington County |
| Prairie Acres South | SD4600428 | CWS | Rapid City | 170 | Pennington County |
| Prairie Haven Subdivision | SD4602322 | CWS | Black Hawk | 105 | Meade County, Pennington County |
| Prairiewood Property Owners | SD4602125 | CWS | Aberdeen | 300 | Brown County |
| Presho | SD4600248 | CWS | Presho | 472 | Lyman County |
| Provo Area Water System | SD4600396 | CWS | Edgemont | 25 | Fall River County |
| Pukwana | SD4600250 | CWS | Chamberlain | 267 | Brule County |
| Quaal Water Association | SD4602127 | CWS | Black Hawk | 95 | Meade County |
| Ramona | SD4600252 | CWS | Arlington | 159 | Lake County |
| Rapid City Mobile Home Park | SD4600257 | CWS | Black Hawk | 170 | Pennington County |
| Red Cloud School | 084690512 | CWS | Pine Ridge | 501 | Oglala Lakota County |
| Red Iron Lake Water System | 084690456 | CWS | Agency Village | 95 | Marshall County |
| Red Water Distribution Llc | SD4602257 | CWS | Aladdin | 35 | Butte County |
| Red Willow Colony | SD4602352 | CWS | White | 93 | Brookings County |
| Redfield | SD4600277 | CWS | Redfield | 2,214 | Spink County |
| Reynolds Court | SD4600160 | CWS | Spearfish | 28 | Pennington County |
| Richmond Heights Homeowners Associat | SD4600504 | CWS | Aberdeen | 67 | Brown County |
| Rimrock Heights Homeowners Associati | SD4602356 | CWS | Rapid City | 35 | Pennington County |
| Rimrock Highland Estates Comm Assoc | SD4602231 | CWS | Piedmont | 66 | Meade County |
| Rimrock Ridge Water Association | SD4602084 | CWS | Rapid City | 35 | Pennington County |
| Rimrock Water Company Llc | SD4602220 | CWS | Aladdin | 365 | Butte County |
| Riverside Colony | SD4602040 | CWS | Huron | 80 | Beadle County |
| Riverside Mobile Home Court | SD4600508 | CWS | Spearfish | 75 | Butte County |
| Rock Ridge Court | SD4602209 | CWS | Rapid City | 74 | Custer County |
| Rolling Dice Subdivision | SD4602249 | CWS | Piedmont | 122 | Meade County |
| Rolling Meadows | SD4600620 | CWS | Aberdeen | 83 | Brown County |
| Roscoe | SD4600282 | CWS | Roscoe | 269 | Edmunds County |
| Rosholt | SD4600283 | CWS | Rosholt | 379 | Roberts County |
| Roslyn | SD4600284 | CWS | Roslyn | 181 | Day County |
| Rushmore Ranch Estates | SD4602212 | CWS | Black Hawk | 168 | Pennington County |
| Sacora Mobile Home Park | SD4600546 | CWS | Black Hawk | 42 | Meade County |
| Saint Lawrence | SD4600286 | CWS | Miller | 198 | Hand County |
| Saint Onge Sewer & Water Co | SD4600287 | CWS | Spearfish | 255 | Lawrence County |
| Salem | SD4600288 | CWS | Salem | 1,325 | McCook County |
| Sanborn Central School District | SD4602242 | NTNCWS | Letcher | 125 | Sanborn County |
| Scotland | SD4600290 | CWS | Scotland | 785 | Bon Homme County |
| Selby | SD4600291 | CWS | Selby | 645 | Walworth County |
| Seneca | SD4600292 | CWS | Seneca | 25 | Faulk County |
| Shamrock Colony | SD4602267 | CWS | Carpenter | 75 | Beadle County, Clark County |
| Sheridan Lake Highlands, Inc. | SD4602285 | CWS | Piedmont | 85 | Pennington County |
| Shirt Tail Gulch Development | SD4602232 | CWS | Black Hawk | 65 | Lawrence County |
| Siphon Hill Water Association | SD4600272 | CWS | Rapid City | 68 | Pennington County |
| Sisseton | SD4600310 | CWS | Sisseton | 2,479 | Roberts County |
| Skyline Heights | SD4600297 | CWS | Sioux Falls | 110 | Minnehaha County |
| South Canyon Country Estates | SD4600627 | CWS | Rapid City | 420 | Pennington County |
| South Ideal | 084690526 | CWS | Rosebud | 176 | Tripp County |
| South Shore | SD4602068 | CWS | South Shore | 189 | Codington County |
| Southbrook Estates | SD4600072 | CWS | Brookings | 28 | Brookings County |
| Southern Black Hills Water | SD4602309 | CWS | Hot Springs | 947 | Custer County, Fall River County, Pennington County |
| Spearfish Forest Products | SD4602313 | NTNCWS | Spearfish | 120 | Lawrence County |
| Spearfish Meadows | SD4600875 | CWS | Rapid City | 87 | Lawrence County |
| Spearfish Valley Mobile Estates | SD4600625 | CWS | Spearfish | 163 | Lawrence County |
| Spencer | SD4600407 | CWS | Spencer | 170 | McCook County |
| Spink Colony | SD4602059 | CWS | Frankfort | 108 | Spink County |
| Spring Canyon Water Company | SD4600015 | CWS | Piedmont | 92 | Pennington County |
| Spring Creek Acres | SD4602252 | CWS | Black Hawk | 172 | Custer County, Pennington County |
| Spring Creek Preserve | SD4602331 | CWS | Spearfish | 68 | Lawrence County |
| Spring Creek Ranch | SD4602355 | NTNCWS | Spearfish | 30 | Lawrence County |
| Spring Creek Sanitary District | SD4602089 | CWS | Pierre | 465 | Hughes County, Sully County |
| Spring Lake Colony | SD4602076 | CWS | Arlington | 114 | Kingsbury County |
| Springfield | SD4600317 | CWS | Springfield | 2,108 | Bon Homme County |
| Stagebarn Sanitary District | SD4602159 | CWS | Rapid City | 295 | Meade County |
| State Veterans Home | SD4600055 | NTNCWS | Hot Springs | 205 | Fall River County |
| Stickney | SD4600318 | CWS | Stickney | 321 | Aurora County |
| Stratford | SD4600408 | CWS | Stratford | 57 | Brown County |
| Strato Rim Estates Water Company | SD4602191 | CWS | Rapid City | 170 | Pennington County |
| Summit | SD4600326 | CWS | Summit | 288 | Roberts County |
| Sunnyside Mobile Home Park Ii | SD4602001 | CWS | Piedmont | 235 | Pennington County |
| Sunrise Colony | SD4600320 | CWS | Summit | 94 | Grant County |
| Sunrise Homeowners Association | SD4600512 | CWS | Spearfish | 50 | Lawrence County |
| Sunrise Water System | 084690033 | CWS | Pine Ridge | 340 | Bennett County |
| Sunset Colony | SD4602025 | CWS | Britton | 140 | Marshall County |
| Sunset Ranch | SD4602263 | CWS | Piedmont | 263 | Pennington County |
| T C & G Rural Water System | SD4600143 | CWS | Mobridge | 166 | Corson County, Dewey County |
| Tabor | SD4600327 | CWS | Tabor | 423 | Bon Homme County |
| Terry Trojan Water District | SD4600053 | CWS | Black Hawk | 400 | Lawrence County |
| The Meadows | SD4600023 | CWS | Aberdeen | 80 | Brown County |
| The Ranch At Black Gap | SD4602203 | CWS | Rapid City | 375 | Pennington County |
| The Timbers | SD4602376 | CWS | Black Hawk | 33 | Lawrence County |
| Thrall Mtn. Property Owners Associat | SD4600513 | CWS | Black Hawk | 70 | Pennington County |
| Three Peaks Water Association | SD4602401 | CWS | Black Hawk | 28 | Lawrence County |
| Timber Lake | SD4600411 | CWS | Timber Lake | 499 | Dewey County |
| Timberland Park | SD4600412 | CWS | Yankton | 95 | Yankton County |
| Timberwood Park Estates | SD4602272 | CWS | Piedmont | 283 | Meade County |
| Tolstoy | SD4600331 | CWS | Tolstoy | 36 | Potter County |
| Trent | SD4600333 | CWS | Trent | 206 | Moody County |
| Tripp | SD4600334 | CWS | Tripp | 575 | Hutchinson County |
| Tulare | SD4600335 | CWS | Miller | 211 | Spink County |
| Two Bit Ranch Estates | SD4602319 | CWS | Spearfish | 30 | Lawrence County |
| Tyndall | SD4600337 | CWS | Tyndall | 1,012 | Bon Homme County |
| University Estates | SD4600075 | CWS | Brookings | 150 | Brookings County |
| Upland Colony | SD4602077 | CWS | Artesian | 198 | Sanborn County |
| Usfs - Nemo Water System | SD4680083 | NTNCWS | Spearfish | 31 | Lawrence County |
| Utica | SD4600338 | CWS | Gayville | 65 | Yankton County |
| Vale Sanitary District | SD4600415 | CWS | Vale | 120 | Butte County |
| Valhalla Addition | SD4602211 | CWS | Black Hawk | 38 | Lawrence County |
| Valley Heights Estates Inc | SD4602361 | CWS | Sturgis | 320 | Pennington County |
| Valley Springs | SD4600340 | CWS | Valley Springs | 925 | Minnehaha County |
| Valley View Estates | SD4600300 | CWS | Sioux Falls | 230 | Minnehaha County |
| Valley View Water Association | SD4602343 | CWS | Piedmont | 42 | Lawrence County, Meade County |
| Valley View Water Company | SD4600040 | CWS | Piedmont | 248 | Meade County |
| Veblen | SD4600341 | CWS | Veblen | 317 | Marshall County |
| Veblen Flats | 084690463 | CWS | Agency Village | 60 | Marshall County |
| Viborg | SD4600343 | CWS | Viborg | 814 | Turner County |
| Viewfield Rural Water System | SD4602287 | CWS | Black Hawk | 220 | Meade County |
| Vivos Xpoint | SD4600414 | CWS | Del Mar | 40 | Fall River County |
| Volga | SD4600346 | CWS | Volga | 2,340 | Brookings County |
| Volin | SD4600347 | CWS | Volin | 161 | Yankton County |
| Wagner | SD4600348 | CWS | Wagner | 1,490 | Charles Mix County |
| Wagner North Housing Water System | 084690535 | CWS | Wagner | 180 | Charles Mix County |
| Wagner South Housing Water System | 084690536 | CWS | Wagner | 200 | Charles Mix County |
| Wakonda | SD4600349 | CWS | Wakonda | 276 | Clay County |
| Wakpamni Water System | 084690484 | CWS | Pine Ridge | 104 | Oglala Lakota County |
| Wallace | SD4600350 | CWS | Wallace | 91 | Codington County |
| Walnut Park | SD4600316 | CWS | Spearfish | 180 | Lawrence County |
| Wanblee East | 084690021 | CWS | Pine Ridge | 2,179 | Bennett County, Jackson County |
| Wanblee Water System | 084690471 | CWS | Pine Ridge | 773 | Jackson County, Oglala Lakota County |
| Ward | SD4600351 | CWS | Ward | 41 | Moody County |
| Warner | SD4600418 | CWS | Warner | 485 | Brown County |
| Wasta | SD4600352 | CWS | Wasta | 84 | Pennington County |
| Waubay | SD4600357 | CWS | Waubay | 473 | Day County |
| Webster | SD4600360 | CWS | Webster | 1,728 | Day County |
| Wentworth | SD4600419 | CWS | Egan | 181 | Lake County |
| Wessington | SD4600361 | CWS | Wessington | 170 | Beadle County, Hand County |
| Wessington Springs | SD4600362 | CWS | Wessington Springs | 895 | Jerauld County |
| West Nike Subdivision | SD4602260 | CWS | Rapid City | 50 | Meade County |
| Westberry Trails Water Users Assoc | SD4600253 | CWS | Piedmont | 155 | Pennington County |
| Westfield Addition | SD4600521 | CWS | Spearfish | 104 | Lawrence County |
| Weston Heights Homeowners Associatio | SD4600862 | CWS | Piedmont | 412 | Meade County |
| Westport Sanitary District | SD4600179 | CWS | Aberdeen | 88 | Brown County |
| Westview Homeowners Association | SD4600876 | CWS | Spearfish | 103 | Lawrence County |
| Wharf Resources Water System | SD4600933 | NTNCWS | Lead | 250 | Lawrence County |
| Whispering Pines Water Association | SD4600268 | CWS | Rapid City | 48 | Pennington County |
| Whispering Willows | SD4602094 | CWS | Black Hawk | 64 | Pennington County |
| White | SD4600364 | CWS | White | 499 | Brookings County |
| White Horse Creek Water System | 084690022 | CWS | Pine Ridge | 1,690 | Oglala Lakota County |
| White Lake | SD4600366 | CWS | White Lake | 359 | Aurora County |
| White River | SD4600367 | CWS | White River | 533 | Mellette County |
| White Rock Colony | SD4602027 | CWS | Rosholt | 108 | Roberts County |
| Whitewood | SD4600368 | CWS | Whitewood | 879 | Lawrence County |
| Whitewood Forest Acres | SD4602354 | CWS | Whitewood | 160 | Lawrence County |
| Wild Turkey Estates I | SD4602281 | CWS | Black Hawk | 33 | Lawrence County |
| Wild Turkey Estates Ii | SD4602282 | CWS | Black Hawk | 70 | Lawrence County |
| Willow Lake | SD4600370 | CWS | Willow Lake | 255 | Clark County |
| Wilmot | SD4600371 | CWS | Wilmot | 432 | Roberts County |
| Winner | SD4600373 | CWS | Winner | 2,921 | Tripp County |
| Wolf Creek School | 084690538 | CWS | Batesland | 1,450 | Oglala Lakota County |
| Wolsey | SD4600375 | CWS | Wolsey | 459 | Beadle County |
| Wonderland Homes | SD4600421 | CWS | Rapid City | 750 | Meade County |
| Woodland Hills Sanitary District | SD4600042 | CWS | Black Hawk | 255 | Meade County |
| Woonsocket | SD4600376 | CWS | Woonsocket | 618 | Sanborn County |
| Worthing | SD4600377 | CWS | Worthing | 939 | Lincoln County |
| Wounded Knee District School | 084690467 | CWS | Manderson | 280 | Oglala Lakota County |
| Wounded Knee Water System | 084690478 | CWS | Pine Ridge | 255 | Oglala Lakota County |
| Wr/Lj - Creighton Project | SD4602156 | CWS | Philip | 1,170 | Haakon County, Jackson County, Jones County, Pennington County |
| Wr/Lj - North Stanley County | SD4602224 | CWS | Murdo | 2,710 | Hughes County, Stanley County |