South Dakota tap water quality
513 community water systems
1.4%
exceed lead action level
(7/507 systems)
(7/507 systems)
1.8%
PFOA/PFOS detected
(1/55 systems)
(1/55 systems)
Largest water systems
Lead is the LCR 90th-percentile result; a value above 0.015 mg/L exceeds the
EPA action level. “—” means no lead sample is on file for that system.
| System | City | Population | Lead (p90) |
|---|---|---|---|
| SIOUX FALLS | SIOUX FALLS | 216,462 | 0.0060 mg/L |
| RAPID CITY | RAPID CITY | 72,009 | 0.0050 mg/L |
| ABERDEEN | ABERDEEN | 27,989 | 0.0045 mg/L |
| BROOKINGS MUNICIPAL UTILITIES | BROOKINGS | 23,377 | 0.0140 mg/L |
| WATERTOWN MUNICIPAL UTILITIES | WATERTOWN | 23,230 | 0.0030 mg/L |
| WEB WATER DEVELOPMENT ASSOCIATION | ABERDEEN | 20,750 | 0.0040 mg/L |
| MITCHELL | MITCHELL | 15,651 | 0.0035 mg/L |
| YANKTON | YANKTON | 15,411 | 0.0020 mg/L |
| HURON | HURON | 14,263 | 0.0060 mg/L |
| PIERRE | PIERRE | 14,091 | 0.0047 mg/L |
| BOX ELDER | BOX ELDER | 14,000 | 0.0040 mg/L |
| SPEARFISH | SPEARFISH | 13,803 | 0.0060 mg/L |
| MINNEHAHA COMMUNITY WATER CORP | DELL RAPIDS | 13,435 | 0.0057 mg/L |
| BY WATER DISTRICT | AVON | 13,320 | 0.0020 mg/L |
| MID-DAKOTA RURAL WATER | MILLER | 11,833 | 0.0043 mg/L |
| VERMILLION | VERMILLION | 11,695 | 0.0027 mg/L |
| RAPID VALLEY SANITARY DISTRICT | RAPID CITY | 11,408 | 0.0070 mg/L |
| BRANDON | BRANDON | 11,048 | 0.0032 mg/L |
| HARRISBURG | HARRISBURG | 10,297 | 0.0040 mg/L |
| ELLSWORTH AFB | ELLSWORTH AFB | 9,100 | 0.0037 mg/L |
| PINE RIDGE WATER SYSTEM | 7,482 | 0.0029 mg/L | |
| TEA | TEA | 7,381 | 0.0036 mg/L |
| STURGIS | STURGIS | 7,020 | 0.0060 mg/L |
| KYLE WATER SYSTEM | 6,526 | 0.0027 mg/L | |
| KINGBROOK I RURAL WATER SYSTEM | ARLINGTON | 6,455 | 0.0070 mg/L |
| RANDALL COMMUNITY WATER DISTRICT | LAKE ANDES | 6,248 | 0.0050 mg/L |
| BROOKINGS-DEUEL RURAL WATER SYSTEM | CLEAR LAKE | 6,200 | 0.0070 mg/L |
| MADISON | MADISON | 6,191 | 0.0030 mg/L |
| LINCOLN COUNTY RURAL WATER SYSTEM | SIOUX FALLS | 5,965 | 0.0050 mg/L |
| BIG SIOUX COMMUNITY WATER SYSTEM | EGAN | 5,800 | 0.0030 mg/L |
| BROWN-DAY-MARSHALL RWS | BRITTON | 5,673 | 0.0030 mg/L |
| BELLE FOURCHE | BELLE FOURCHE | 5,617 | 0.0076 mg/L |
| SICANGU MNI WICONI RURAL WATER SYSTEM | 5,610 | 0.0017 mg/L | |
| ROSEBUD RURAL WATER SYSTEM | 5,500 | 0.0026 mg/L | |
| SOUTH LINCOLN RURAL WATER SYSTEM | BERESFORD | 5,250 | 0.0039 mg/L |
| GRANT-ROBERTS RURAL WATER SYSTEM | MILBANK | 5,050 | 0.0067 mg/L |
| TRIPP COUNTY WATER USER DISTRICT | HAMILL | 4,860 | 0.0050 mg/L |
| CLAY RURAL WATER SYSTEM | WAKONDA | 4,780 | 0.0046 mg/L |
| WR/LJ - MNI WICONI | MURDO | 4,720 | 0.0050 mg/L |
| BLACK HAWK WATER USER DISTRICT | BLACK HAWK | 4,500 | 0.0050 mg/L |
| SIOUX RURAL WATER SYSTEM | GOODWIN | 4,280 | 0.0067 mg/L |
| TM RURAL WATER DISTRICT | PARKER | 4,250 | 0.0040 mg/L |
| EAGLE BUTTE | EAGLE BUTTE | 4,000 | 0.0046 mg/L |
| DAKOTA DUNES CID | DAKOTA DUNES | 3,700 | 0.0070 mg/L |
| DELL RAPIDS | DELL RAPIDS | 3,633 | 0.0111 mg/L |
| OGLALA RWS PIPELINE | 3,562 | 0.0021 mg/L | |
| MILBANK | MILBANK | 3,544 | 0.0033 mg/L |
| DAVISON RURAL WATER SYSTEM INC | MITCHELL | 3,485 | 0.0042 mg/L |
| HARTFORD | HARTFORD | 3,396 | 0.0016 mg/L |
| HOT SPRINGS | HOT SPRINGS | 3,395 | 0.0054 mg/L |
| MOBRIDGE | MOBRIDGE | 3,261 | 0.0020 mg/L |
| CANTON | CANTON | 3,066 | 0.0050 mg/L |
| NORTH SIOUX CITY | NORTH SIOUX CITY | 3,042 | 0.0060 mg/L |
| LEAD | LEAD | 2,982 | 0.0021 mg/L |
| WINNER | WINNER | 2,921 | 0.0064 mg/L |
| KINGBROOK III RURAL WATER SYSTEM | ARLINGTON | 2,888 | 0.0036 mg/L |
| AURORA-BRULE RURAL WATER SYSTEM | KIMBALL | 2,750 | 0.0050 mg/L |
| KINGBROOK II RURAL WATER SYSTEM | ARLINGTON | 2,715 | 0.0098 mg/L |
| HANSON RURAL WATER SYSTEM | EMERY | 2,685 | 0.0030 mg/L |
| LENNOX | LENNOX | 2,571 | 0.0047 mg/L |
| WR/LJ - NORTH STANLEY COUNTY | MURDO | 2,492 | 0.0028 mg/L |
| SISSETON | SISSETON | 2,479 | 0.0104 mg/L |
| CHAMBERLAIN | CHAMBERLAIN | 2,473 | 0.0054 mg/L |
| ST. FRANCIS | 2,450 | 0.0018 mg/L | |
| FLANDREAU | FLANDREAU | 2,372 | 0.0040 mg/L |
| BERESFORD | BERESFORD | 2,359 | 0.0046 mg/L |
| VOLGA | VOLGA | 2,340 | 0.0040 mg/L |
| CLARK RURAL WATER SYSTEM | CLARK | 2,325 | 0.0037 mg/L |
| FORT PIERRE | FORT PIERRE | 2,236 | 0.0067 mg/L |
| REDFIELD | REDFIELD | 2,214 | 0.0118 mg/L |
| TRI-COUNTY RURAL WATER SYSTEM | EAGLE BUTTE | 2,190 | 0.0040 mg/L |
| WANBLEE EAST | 2,179 | 0.0028 mg/L | |
| ELK POINT | ELK POINT | 2,124 | 0.0060 mg/L |
| SPRINGFIELD | SPRINGFIELD | 2,108 | 0.0020 mg/L |
| CUSTER | CUSTER | 1,919 | 0.0056 mg/L |
| WEBSTER | WEBSTER | 1,728 | 0.0149 mg/L |
| WHITE HORSE CREEK WATER SYSTEM | 1,690 | 0.0013 mg/L | |
| LOWER BRULE RURAL WATER SUPPLY SYSTEM | 1,637 | 0.0020 mg/L | |
| PARKSTON | PARKSTON | 1,567 | 0.0131 mg/L |
| MARTIN | MARTIN | 1,500 | 0.0050 mg/L |
| MISSION WATER SYSTEM | 1,500 | 0.0030 mg/L | |
| WAGNER | WAGNER | 1,490 | 0.0030 mg/L |
| BUTTE-MEADE SWD-BEAN WELL | NEWELL | 1,481 | 0.0038 mg/L |
| WOLF CREEK SCHOOL | 1,450 | — | |
| CLAY RWS/SOUTH UNION | WAKONDA | 1,447 | 0.0059 mg/L |
| GROTON | GROTON | 1,380 | 0.0074 mg/L |
| CROOKS | CROOKS | 1,362 | 0.0036 mg/L |
| FORT THOMPSON WATER SYSTEM | 1,357 | 0.0019 mg/L | |
| MILLER | MILLER | 1,349 | 0.0122 mg/L |
| FREEMAN | FREEMAN | 1,329 | 0.0064 mg/L |
| SALEM | SALEM | 1,325 | 0.0097 mg/L |
| BALTIC | BALTIC | 1,271 | 0.0018 mg/L |
| PLATTE | PLATTE | 1,256 | 0.0179 mg/L |
| LAKOTA TECH HIGH SCHOOL | BATESLAND | 1,250 | 0.0019 mg/L |
| GARRETSON | GARRETSON | 1,228 | 0.0044 mg/L |
| GREGORY | GREGORY | 1,221 | 0.0064 mg/L |
| CLEAR LAKE | CLEAR LAKE | 1,218 | 0.0116 mg/L |
| BRITTON | BRITTON | 1,215 | 0.0040 mg/L |
| CHAPEL LANE WATER COMPANY | RAPID CITY | 1,200 | 0.0047 mg/L |
| AURORA | AURORA | 1,200 | 0.0050 mg/L |