South Dakota Drinking Water Compliance Records
463 water systems serving 879,933 people. 5,785 historical EPA violation records in the Q2 2026 snapshot.
TapScore Compliance-History Grades
A
374
81%
B
49
11%
C
38
8%
D
1
0%
F
1
0%
463
Water Systems
879,933
Population Served
5,785
Historical Records
600
Health-Based (All Years)
Systems With the Most Recent EPA Records
WARD
41 served22 historical records19 recent
C
PROVO AREA WATER SYSTEM
25 served88 historical records11 recent
D
ROCK RIDGE COURT
74 served62 historical records9 recent
C
BOX ELDER
14,000 served75 historical records8 recent
F
TOLSTOY
36 served18 historical records7 recent
C
LESTERVILLE
115 served12 historical records5 recent
C
NISLAND
206 served84 historical records5 recent
C
CORONA
69 served29 historical records4 recent
C
BUFFALO GAP
126 served89 historical records4 recent
C
HENRY
256 served10 historical records4 recent
C
Large Systems With No Recent Records
SIOUX FALLS
216,462 served2 historical records
A
RAPID CITY
72,009 served3 historical records
A
BROOKINGS MUNICIPAL UTILITIES
23,377 served3 historical records
A
WATERTOWN MUNICIPAL UTILITIES
23,230 served3 historical records
A
WEB WATER DEVELOPMENT ASSOCIATION
20,750 served0 historical records
A
YANKTON
15,411 served6 historical records
A
HURON
14,263 served3 historical records
A
PIERRE
14,091 served2 historical records
A
SPEARFISH
13,803 served2 historical records
A
MINNEHAHA COMMUNITY WATER CORP
13,435 served2 historical records
A
Largest Water Systems in South Dakota
| Water System | Grade | Population | Historical Records |
|---|---|---|---|
| SIOUX FALLS | A | 216,462 | 2 |
| RAPID CITY | A | 72,009 | 3 |
| ABERDEEN | C | 27,989 | 4 |
| BROOKINGS MUNICIPAL UTILITIES | A | 23,377 | 3 |
| WATERTOWN MUNICIPAL UTILITIES | A | 23,230 | 3 |
| WEB WATER DEVELOPMENT ASSOCIATION | A | 20,750 | 0 |
| MITCHELL | B | 15,651 | 5 |
| YANKTON | A | 15,411 | 6 |
| HURON | A | 14,263 | 3 |
| PIERRE | A | 14,091 | 2 |
| BOX ELDER | F | 14,000 | 75 |
| SPEARFISH | A | 13,803 | 2 |
| MINNEHAHA COMMUNITY WATER CORP | A | 13,435 | 2 |
| BY WATER DISTRICT | A | 13,320 | 2 |
| MID-DAKOTA RURAL WATER | A | 11,833 | 0 |
| VERMILLION | A | 11,695 | 3 |
| RAPID VALLEY SANITARY DISTRICT | A | 11,408 | 4 |
| BRANDON | B | 11,048 | 7 |
| HARRISBURG | A | 10,297 | 3 |
| ELLSWORTH AFB | A | 9,100 | 1 |
Contaminants in South Dakota
Lead in South DakotaArsenic in South DakotaNitrate in South DakotaFluoride in South DakotaPFOS in South DakotaPFOA in South DakotaTHMs in South DakotaHAA5 in South Dakota
Cities in South Dakota
SIOUX FALLS(9)RAPID CITY(67)ABERDEEN(34)WATERTOWN(2)PIERRE(4)BROOKINGS(4)MITCHELL(2)DELL RAPIDS(2)SPEARFISH(28)YANKTON(3)HURON(3)MILLER(7)BOX ELDER(1)AVON(2)TABOR(2)ARLINGTON(6)VERMILLION(2)BRANDON(1)BLACK HAWK(47)HARRISBURG(1)ELLSWORTH AFB(1)STURGIS(10)MURDO(4)MILBANK(2)WINNER(2)BERESFORD(3)CLEAR LAKE(2)TEA(2)BRITTON(7)LAKE ANDES(3)EGAN(4)WAKONDA(3)TORONTO(1)MADISON(1)EAGLE BUTTE(2)WORTHING(2)BELLE FOURCHE(3)PIEDMONT(27)HOT SPRINGS(9)PARKER(2)HAMILL(1)GOODWIN(1)CLARK(3)LEAD(6)DAKOTA DUNES(1)MOBRIDGE(2)HARTFORD(1)KIMBALL(2)FLORENCE(3)EMERY(2)CANTON(1)NORTH SIOUX CITY(1)CHAMBERLAIN(2)FULTON(1)LENNOX(1)SISSETON(1)FLANDREAU(2)NEWELL(3)REDFIELD(2)VOLGA(1)FORT PIERRE(1)RIDGEVIEW(1)ELK POINT(1)SPRINGFIELD(1)PHILIP(2)CUSTER(1)WEBSTER(1)MARTIN(2)WHITEWOOD(5)PARKSTON(1)WAGNER(1)HILL CITY(3)BATESLAND(2)GROTON(1)DEADWOOD(6)CROOKS(1)FREEMAN(1)SALEM(1)BALTIC(1)PLATTE(1)GARRETSON(1)GREGORY(1)AURORA(1)GETTYSBURG(1)LEMMON(1)NEW UNDERWOOD(4)FAULKTON(4)ORAL(1)DE SMET(1)TYNDALL(1)SCOTLAND(2)IPSWICH(1)VALLEY SPRINGS(1)CENTERVILLE(1)WESSINGTON SPRINGS(1)MARION(1)ELKTON(2)MINA(1)HOWARD(1)GARDEN CITY(4)