STATE / TERRITORY LEDGER
South Dakota drinking water system records
EPA’s September 2026 export lists 61 active community water systems in South Dakota, with 4 current-violation flags and 2 serious-violator flags among covered systems serving at least 2,500 people.
Source: EPA SDWIS system-search export · Active community systems · Snapshot 13 Sep 2026
Systems61active CWS · pop. 2,500+
Population served752,965reported total; may overlap
Current violation flag6.6%4 systems
Serious-violator flag3.3%2 systems
01 / LARGEST SYSTEMS
South Dakota community water systems
EPA’s covered South Dakota records include 61 active community systems reporting a combined population-served total of 752,965, which may overlap.
Population served is a system-reported service figure. It is not a count of unique state residents.
| Water system | Population served | Primary source | Current export status |
|---|---|---|---|
| Sioux FallsSD4600294 | 216,462 | Surface water | No current violation flagged |
| Rapid CitySD4600406 | 72,009 | Surface water | No current violation flagged |
| AberdeenSD4600020 | 27,989 | Surface water | No current violation flagged |
| Brookings Municipal UtilitiesSD4600071 | 23,377 | Ground water | No current violation flagged |
| Watertown Municipal UtilitiesSD4600356 | 23,230 | Ground water | No current violation flagged |
| Web Water Development AssociationSD4601089 | 20,750 | Surface water | No current violation flagged |
| MitchellSD4600214 | 15,651 | Surface water purchased | No current violation flagged |
| YanktonSD4600423 | 15,411 | Ground water | No current violation flagged |
| HuronSD4600169 | 14,263 | Surface water purchased | No current violation flagged |
| PierreSD4600242 | 14,091 | Surface water | No current violation flagged |
| Box ElderSD4600046 | 14,000 | Ground water | Current serious-violator flag |
| SpearfishSD4600311 | 13,803 | Ground water | No current violation flagged |
| Minnehaha Community Water CorpSD4600432 | 13,435 | Ground water | No current violation flagged |
| By Water DistrictSD4600865 | 13,320 | Surface water | No current violation flagged |
| Mid-Dakota Rural WaterSD4602175 | 11,833 | Surface water | No current violation flagged |
| VermillionSD4600342 | 11,695 | Ground water | No current violation flagged |
| Rapid Valley Sanitary DistrictSD4600274 | 11,408 | Surface water | No current violation flagged |
| BrandonSD4600048 | 11,048 | Ground water | No current violation flagged |
| HarrisburgSD4600148 | 10,297 | Ground water purchased | No current violation flagged |
| Ellsworth AfbSD4680004 | 9,100 | Surface water purchased | No current violation flagged |
| Pine Ridge Water System084690475 | 7,482 | Ground water | No current violation flagged |
| TeaSD4600409 | 7,381 | Ground water purchased | No current violation flagged |
| SturgisSD4600321 | 7,020 | Ground water | No current violation flagged |
| Standing Rock Rural Water System084690510 | 6,839 | Surface water | Current serious-violator flag |
| Kyle Water System084690474 | 6,526 | Surface water purchased | No current violation flagged |
| Kingbrook I Rural Water SystemSD4600431 | 6,455 | Ground water purchased | No current violation flagged |
| Randall Community Water DistrictSD4600433 | 6,248 | Surface water | No current violation flagged |
| Brookings-Deuel Rural Water SystemSD4600430 | 6,200 | Ground water | No current violation flagged |
| MadisonSD4600199 | 6,191 | Ground water | No current violation flagged |
| Lincoln County Rural Water SystemSD4600304 | 5,965 | Ground water purchased | No current violation flagged |
| Big Sioux Community Water SystemSD4600429 | 5,800 | Ground water | No current violation flagged |
| Brown-Day-Marshall RwsSD4600882 | 5,673 | Ground water | No current violation flagged |
| Belle FourcheSD4600037 | 5,617 | Ground water | No current violation flagged |
| Sicangu Mni Wiconi Rural Water System084690516 | 5,610 | Surface water purchased | Current health-based flag |
| Rosebud Rural Water System084690528 | 5,500 | Ground water | Current health-based flag |
| South Lincoln Rural Water SystemSD4600870 | 5,250 | Ground water | No current violation flagged |
| Grant-Roberts Rural Water SystemSD4600864 | 5,050 | Ground water | No current violation flagged |
| Tripp County Water User DistrictSD4600520 | 4,860 | Ground water | No current violation flagged |
| Clay Rural Water SystemSD4600626 | 4,780 | Ground water | No current violation flagged |
| Wr/Lj - Mni WiconiSD4602223 | 4,720 | Surface water purchased | No current violation flagged |
| Black Hawk Water User DistrictSD4600043 | 4,500 | Ground water | No current violation flagged |
| Sioux Rural Water SystemSD4600866 | 4,280 | Ground water | No current violation flagged |
| Tm Rural Water DistrictSD4600999 | 4,250 | Surface water purchased | No current violation flagged |
| Eagle ButteSD4600010 | 4,000 | Surface water purchased | No current violation flagged |
| Dakota Dunes CidSD4602093 | 3,700 | Purchased ground water under influence of surface water source | No current violation flagged |
| Dell RapidsSD4600105 | 3,633 | Ground water purchased | No current violation flagged |
| Oglala Rws Pipeline084690480 | 3,562 | Ground water | No current violation flagged |
| MilbankSD4600207 | 3,544 | Ground water | No current violation flagged |
| Davison Rural Water System IncSD4601090 | 3,485 | Surface water purchased | No current violation flagged |
| HartfordSD4600150 | 3,396 | Ground water purchased | No current violation flagged |
| Hot SpringsSD4600163 | 3,395 | Ground water | No current violation flagged |
| MobridgeSD4600215 | 3,261 | Surface water | No current violation flagged |
| CantonSD4600082 | 3,066 | Ground water | No current violation flagged |
| North Sioux CitySD4600226 | 3,042 | Ground water | No current violation flagged |
| LeadSD4602164 | 2,982 | Surface water purchased | No current violation flagged |
| WinnerSD4600373 | 2,921 | Ground water | No current violation flagged |
| Kingbrook Iii Rural Water SystemSD4600874 | 2,888 | Ground water | No current violation flagged |
| Aurora-Brule Rural Water SystemSD4600621 | 2,750 | Surface water | No current violation flagged |
| Kingbrook Ii Rural Water SystemSD4600511 | 2,715 | Ground water | No current violation flagged |
| Hanson Rural Water SystemSD4600878 | 2,685 | Surface water purchased | No current violation flagged |
| LennoxSD4600193 | 2,571 | Ground water purchased | No current violation flagged |
02 / CITY REPORTS
South Dakota city water-system reports
South Dakota has 21 city reports meeting the publication threshold for covered systems or reported population served.
Arlington3 systemsSioux Falls3 systemsAberdeen2 systemsDell Rapids2 systemsMilbank2 systemsMitchell2 systemsPierre2 systemsRapid City2 systemsWatertown2 systemsWinner2 systemsAvon1 systemsBox Elder1 systemsBrandon1 systemsBrookings1 systemsHarrisburg1 systemsHuron1 systemsMiller1 systemsSpearfish1 systemsTabor1 systemsVermillion1 systemsYankton1 systems
03 / COUNTY REPORTS
South Dakota county water-system reports
South Dakota has 38 county reports meeting the publication threshold for covered systems or reported population served.
Lincoln7 systemsMinnehaha6 systemsBrookings4 systemsDavison4 systemsMcCook4 systemsPennington4 systemsUnion4 systemsBrown3 systemsCodington3 systemsDouglas3 systemsLake3 systemsTurner3 systemsAurora2 systemsClay2 systemsDay2 systemsDeuel2 systemsGrant2 systemsHanson2 systemsHughes2 systemsHutchinson2 systemsLawrence2 systemsLyman2 systemsMarshall2 systemsMeade2 systemsTripp2 systemsWalworth2 systemsYankton2 systemsBeadle1 systemsBon Homme1 systemsCampbell1 systemsEdmunds1 systemsFaulk1 systemsHand1 systemsHyde1 systemsMcPherson1 systemsPotter1 systemsSpink1 systemsSully1 systems