All water systems in South Dakota
703 systems
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Sioux Falls Sioux Falls · Minnehaha County |
216,462 | 0 | 0 | |
|
Rapid City Rapid City · Pennington County |
72,009 | 0 | 0 | |
|
Aberdeen Aberdeen · Brown County |
27,989 | 1 | 0 | |
|
Brookings Municipal Utilities Brookings · Brookings County |
23,377 | 0 | 0 | |
|
Watertown Municipal Utilities Watertown · Codington County |
23,230 | 0 | 0 | |
|
Web Water Development Association Aberdeen · Brown County |
20,750 | 0 | 0 | |
|
Mitchell Mitchell · Davison County |
15,651 | 1 | 0 | |
|
Yankton Yankton · Yankton County |
15,411 | 0 | 0 | |
|
Huron Huron · Beadle County |
14,263 | 0 | 0 | |
|
Pierre Pierre · Hughes County |
14,091 | 0 | 0 | |
|
Box Elder Box Elder · Pennington County |
14,000 | 1 | 0 | |
|
Spearfish Spearfish · Lawrence County |
13,803 | 0 | 0 | |
|
Minnehaha Community Water Corp Dell Rapids · Lincoln County |
13,435 | 0 | 0 | |
|
BY Water District Avon, Tabor · Bon Homme County |
13,320 | 0 | 0 | |
|
Mid-Dakota Rural Water Miller, Pierre · Hand County |
11,833 | 0 | 0 | |
|
Vermillion Vermillion · Clay County |
11,695 | 0 | 0 | |
|
Rapid Valley Sanitary District Rapid City · Pennington County |
11,408 | 0 | 0 | |
|
Brandon Brandon · Minnehaha County |
11,048 | 0 | 0 | |
|
Harrisburg Harrisburg · Lincoln County |
10,297 | 0 | 0 | |
|
Ellsworth Afb Ellsworth Afb · Pennington County |
9,100 | 0 | 0 | |
|
Pine Ridge Water System County |
7,482 | 2 | 0 | |
|
Tea Tea · Lincoln County |
7,381 | 0 | 0 | |
|
Sturgis Sturgis · Meade County |
7,020 | 0 | 0 | |
|
Standing Rock Rural Water System County |
6,839 | 4 | 1 | |
|
Kyle Water System County |
6,526 | 1 | 0 | |
|
Kingbrook I Rural Water System Arlington · Brookings County |
6,455 | 0 | 0 | |
|
Randall Community Water District Lake Andes · Charles Mix County |
6,248 | 0 | 0 | |
|
Brookings-Deuel Rural Water System Clear Lake, Toronto · Brookings County |
6,200 | 0 | 0 | |
|
Madison Madison · Lake County |
6,191 | 0 | 0 | |
|
Lincoln County Rural Water System Sioux Falls · Lincoln County |
5,965 | 1 | 0 | |
|
Big Sioux Community Water System Egan · Brookings County |
5,800 | 0 | 0 | |
|
Brown-Day-Marshall Rws Britton · Brown County |
5,673 | 0 | 0 | |
|
Belle Fourche Belle Fourche · Butte County |
5,617 | 0 | 0 | |
|
Sicangu Mni Wiconi Rural Water System County |
5,610 | 3 | 1 | |
|
Rosebud Rural Water System County |
5,500 | 2 | 1 | |
|
South Lincoln Rural Water System Beresford, Worthing · Lincoln County |
5,250 | 1 | 0 | |
|
Wr/lj Mni Wiconi Murdo · Jones County |
5,185 | 0 | 0 | |
|
Grant-Roberts Rural Water System Milbank · Codington County |
5,050 | 0 | 0 | |
|
Tripp County Water User District Hamill, Winner · Gregory County |
4,860 | 0 | 0 | |
|
Clay Rural Water System Wakonda · Clay County |
4,780 | 0 | 0 | |
|
Black Hawk Water User District Black Hawk · Meade County |
4,500 | 0 | 0 | |
|
Sioux Rural Water System Goodwin, Watertown · Clark County |
4,280 | 0 | 0 | |
|
TM Rural Water District Parker, Sioux Falls · McCook County |
4,250 | 0 | 0 | |
|
Nps-Mount Rushmore National Memorial Keystone · Pennington County |
4,100 | 0 | 0 | |
|
Eagle Butte Eagle Butte · Dewey County |
4,000 | 3 | 0 | |
|
Dakota Dunes Cid Dakota Dunes · Union County |
3,700 | 0 | 0 | |
|
Dell Rapids Dell Rapids · Minnehaha County |
3,633 | 0 | 0 | |
|
Oglala Rws Pipeline County |
3,562 | 1 | 0 | |
|
Milbank Milbank · Grant County |
3,544 | 0 | 0 | |
|
Davison Rural Water System INC Mitchell · Aurora County |
3,485 | 0 | 0 |
About this data
Rules violated counts the rules a system was in violation of in the past three years, including monitoring and reporting lapses; one rule can carry several violations. Unresolved is the number of those rules still in violation at EPA's latest data refresh.
Source: the U.S. EPA's Enforcement and Compliance History Online system (ECHO), which publishes the federal Safe Drinking Water Information System. EPA's terms and values are shown as published. The South Dakota records are from EPA's data refresh of Oct 7, 2026; EPA refreshes this data quarterly, and states report to EPA with a lag of three to six months, so the newest violations may not appear yet. Retrieved from ECHO on Oct 11, 2026.