State drinking water records
South Dakota drinking water systems
508 community water systems serve South Dakota and are listed below under 66 counties and on the pages of 437 cities and towns. Their own population figures add up to 926,761 people, a sum that counts people twice where one system sells water to another.
178 of them (35%) had at least one health-based violation in the last 10 years. 33 systems still have one unresolved.
345 rely mainly on groundwater and 163 on surface water, counting water bought from other systems.
500 systems filed a lead service line inventory listing 2,082 lead lines, 617 galvanized lines that must be replaced and 105,789 lines of unknown material.
39 systems are placed by mailing address or by the county their records name: EPA has no service area map for 23 of them, and 16 have one that does not line up with their own records.
- Community water systems
- 508
- People served, sum of each system's own figure
- 926,761
- Systems with a health-based violation, last 10 years
- 178
- Systems with one unresolved
- 33
- Lead service lines in inventories
- 2,082
Counties
66 countiesEach county counts the systems whose service area map reaches it. Systems placed only by a mailing address are listed on the county pages but not counted here.
| County | Systems | People served | With a health-based violation, 10 years | With one unresolved |
|---|---|---|---|---|
| Aurora County | 5 | 7,697 | 1 | 0 |
| Beadle County | 8 | 15,565 | 2 | 0 |
| Bennett County | 7 | 5,022 | 3 | 0 |
| Bon Homme County | 6 | 18,238 | 2 | 0 |
| Brookings County | 13 | 47,064 | 4 | 0 |
| Brown County | 20 | 58,618 | 5 | 2 |
| Brule County | 4 | 6,062 | 1 | 0 |
| Buffalo County | 2 | 1,487 | 1 | 0 |
| Butte County | 10 | 8,972 | 3 | 1 |
| Campbell County | 3 | 21,395 | 1 | 0 |
| Charles Mix County | 11 | 11,201 | 3 | 0 |
| Clark County | 5 | 8,041 | 3 | 0 |
| Clay County | 3 | 16,751 | 1 | 0 |
| Codington County | 8 | 35,758 | 5 | 1 |
| Corson County | 4 | 893 | 2 | 0 |
| Custer County | 8 | 3,231 | 3 | 2 |
| Davison County | 5 | 22,602 | 2 | 0 |
| Day County | 10 | 31,825 | 1 | 0 |
| Deuel County | 4 | 11,938 | 2 | 0 |
| Dewey County | 5 | 7,000 | 1 | 0 |
| Douglas County | 5 | 14,817 | 3 | 0 |
| Edmunds County | 8 | 23,727 | 1 | 1 |
| Fall River County | 9 | 6,407 | 5 | 1 |
| Faulk County | 7 | 21,954 | 2 | 0 |
| Grant County | 4 | 8,681 | 1 | 0 |
| Gregory County | 6 | 7,070 | 1 | 0 |
| Haakon County | 3 | 2,049 | 1 | 0 |
| Hamlin County | 6 | 7,145 | 4 | 0 |
| Hand County | 3 | 13,380 | 0 | 0 |
| Hanson County | 3 | 3,814 | 2 | 0 |
| Harding County | 1 | 346 | 0 | 0 |
| Hughes County | 7 | 27,283 | 0 | 0 |
| Hutchinson County | 5 | 17,405 | 3 | 0 |
| Hyde County | 3 | 13,031 | 1 | 0 |
| Jackson County | 5 | 3,785 | 1 | 0 |
| Jerauld County | 2 | 1,107 | 1 | 1 |
| Jones County | 2 | 6,098 | 1 | 1 |
| Kingsbury County | 6 | 5,672 | 2 | 0 |
| Lake County | 6 | 15,582 | 1 | 0 |
| Lawrence County | 38 | 20,670 | 11 | 1 |
| Lincoln County | 9 | 38,160 | 1 | 0 |
| Lyman County | 5 | 7,620 | 1 | 1 |
| Marshall County | 10 | 7,962 | 3 | 0 |
| McCook County | 8 | 12,939 | 2 | 0 |
| McPherson County | 3 | 21,997 | 2 | 1 |
| Meade County | 43 | 45,704 | 15 | 2 |
| Mellette County | 3 | 11,003 | 2 | 1 |
| Miner County | 3 | 3,652 | 1 | 1 |
| Minnehaha County | 15 | 260,702 | 4 | 1 |
| Moody County | 8 | 9,776 | 1 | 1 |
| Oglala Lakota County | 12 | 24,493 | 10 | 1 |
| Pennington County | 58 | 120,855 | 16 | 0 |
| Perkins County | 3 | 1,936 | 1 | 0 |
| Potter County | 3 | 1,544 | 2 | 0 |
| Roberts County | 14 | 16,499 | 4 | 2 |
| Sanborn County | 3 | 4,301 | 1 | 1 |
| Spink County | 11 | 24,229 | 5 | 0 |
| Stanley County | 2 | 2,140 | 0 | 0 |
| Sully County | 3 | 12,956 | 0 | 0 |
| Todd County | 3 | 9,450 | 2 | 2 |
| Tripp County | 4 | 8,280 | 1 | 0 |
| Turner County | 10 | 27,538 | 4 | 1 |
| Union County | 9 | 23,997 | 0 | 0 |
| Walworth County | 4 | 24,777 | 2 | 0 |
| Yankton County | 9 | 29,929 | 5 | 0 |
| Ziebach County | 3 | 6,684 | 2 | 0 |
Largest systems
| System | Main county | People served | Main source | Health-based violations, 10 years | Unresolved | Lead lines |
|---|---|---|---|---|---|---|
| Sioux Falls | Minnehaha County | 216,462 | Surface water | 0 | 0 | 15 |
| Rapid City | Pennington County | 72,009 | Surface water | 0 | 0 | 106 |
| Aberdeen | Brown County | 27,989 | Surface water | 6 | 0 | 1,128 |
| Brookings Municipal Utilities | Brookings County | 23,377 | Groundwater | 1 | 0 | 45 |
| Watertown Municipal Utilities | Codington County | 23,230 | Groundwater | 1 | 0 | 0 |
| Web Water Development Association | Brown County and 9 other counties | 20,750 | Surface water | 0 | 0 | 0 |
| Mitchell | Davison County | 15,651 | Purchased surface water | 0 | 0 | 219 |
| Yankton | Yankton County | 15,411 | Groundwater | 4 | 0 | 0 |
| Huron | Beadle County | 14,263 | Purchased surface water | 0 | 0 | 151 |
| Pierre | Hughes County | 14,091 | Surface water | 0 | 0 | 0 |
| Box Elder | Pennington County and 1 other county | 14,000 | Groundwater | 9 | 0 | 0 |
| Minnehaha Community Water Corp | Minnehaha County and 2 other counties | 13,435 | Groundwater | 0 | 0 | 0 |
| By Water District | Hutchinson County and 6 other counties | 13,320 | Surface water | 2 | 0 | 0 |
| Spearfish | Lawrence County | 12,193 | Groundwater | 0 | 0 | 7 |
| Mid-Dakota Rural Water | Hand County and 3 other counties | 11,833 | Surface water | 0 | 0 | 2 |
Systems with unresolved health-based violations
33 systems| System | Main county | People served | Main source | Health-based violations, 10 years | Unresolved | Lead lines |
|---|---|---|---|---|---|---|
| Mountain Plains 2 Homeowners Assoc | Lawrence County | 268 | Groundwater | 2 | 5 | 0 |
| Vivos Xpoint | Fall River County | 40 | Groundwater | 1 | 4 | No inventory |
| St. Francis | Todd County | 2,450 | Groundwater | 2 | 3 | No inventory |
| Sicangu Mni Wiconi Rural Water System | Mellette County and 1 other county | 5,610 | Purchased surface water | 1 | 2 | No inventory |
| Rosebud Rural Water System | Todd County | 5,500 | Groundwater | 2 | 2 | No inventory |
| Red Cloud School | Oglala Lakota County | 501 | Groundwater | 1 | 2 | 0 |
| Crazy Horse School | Jackson County | 428 | Purchased surface water | 3 | 2 | 0 |
| Flandreau School | Moody County | 375 | Purchased groundwater | 0 | 2 | 0 |
| Jobee Acres | Brown County | 108 | Purchased surface water | 2 | 2 | 0 |
| North Hermosa Wud | Custer County | 40 | Purchased groundwater | 1 | 2 | 0 |
| Wessington Springs | Jerauld County | 895 | Groundwater | 1 | 1 | 0 |
| Woonsocket | Sanborn County | 618 | Groundwater | 1 | 1 | 0 |
| Presho | Lyman County | 472 | Purchased surface water | 0 | 1 | 0 |
| Lakeside Estates | Brown County | 460 | Purchased surface water | 0 | 1 | 0 |
| Leola | McPherson County | 434 | Purchased surface water | 2 | 1 | 0 |
| Weston Heights Homeowners Associatio | Meade County | 412 | Groundwater | 1 | 1 | 0 |
| Chancellor | Turner County | 266 | Purchased groundwater | 1 | 1 | 0 |
| Henry | Codington County | 256 | Purchased groundwater | 2 | 1 | 0 |
| Valley View Estates | Minnehaha County | 230 | Groundwater | 1 | 1 | 0 |
| Nisland | Butte County | 206 | Groundwater | 2 | 1 | 0 |
| Pine Hills Park | Meade County | 200 | Purchased groundwater | 4 | 1 | 0 |
| Hosmer | Edmunds County | 164 | Purchased surface water | 1 | 1 | 0 |
| Peever Flats Water System | Roberts County | 129 | Purchased groundwater | 1 | 1 | 0 |
| Buffalo Gap | Custer County | 126 | Groundwater | 6 | 1 | 38 |
| Pleasant Valley Estates | Brown County | 105 | Purchased surface water | 0 | 1 | 0 |
| Canova | Miner County | 89 | Groundwater | 3 | 1 | 0 |
| Shamrock Colony | Clark County | 75 | Groundwater | 1 | 1 | 0 |
| Rock Ridge Court | Custer County | 74 | Groundwater | 1 | 1 | 0 |
| Corona | Roberts County | 69 | Purchased groundwater | 0 | 1 | 0 |
| Happy Holiday Water Association | Pennington County | 35 | Groundwater | 1 | 1 | No inventory |
| Boulder Colony | Edmunds County | 26 | Groundwater | 1 | 1 | No inventory |
| Provo Area Water System | Fall River County | 25 | Groundwater | 5 | 1 | 0 |
| Darlington Estates | Pennington County | 25 | Groundwater | 3 | 1 | No inventory |
Counties come from the counties EPA lists each system serving, matched to 2024 Census counties; where EPA lists none, from the county coded in the system's ID, its service area map, or its mailing address. A county holding at least a fifth of a system's service area map is added when at least a fifth of that map lies in those counties. Towns are the ones EPA lists and the Census places such a map covers, always inside those counties. In New England, where EPA's town names a whole Town, it is not matched to the village of the same name. A system is not listed in a county holding less than a fifth of its map, or in a county or town its map reaches when the map lies mostly outside the counties EPA lists, so a page can leave out a system that serves part of the area. Methodology and limitations