North Dakota Drinking Water Compliance Records
305 water systems serving 706,282 people. 769 historical EPA violation records in the Q2 2026 snapshot.
TapScore Compliance-History Grades
A
271
89%
B
23
8%
C
6
2%
D
4
1%
F
1
0%
305
Water Systems
706,282
Population Served
769
Historical Records
127
Health-Based (All Years)
Systems With the Most Recent EPA Records
FORBES CITY OF
53 served52 historical records17 recent
D
CATHAY CITY OF
43 served36 historical records16 recent
D
MAXBASS CITY OF
84 served23 historical records8 recent
F
OBERON CITY OF
105 served12 historical records6 recent
D
MERCER CITY OF
94 served15 historical records6 recent
C
ALMONT CITY OF
122 served20 historical records5 recent
C
FLAXTON CITY OF
66 served10 historical records5 recent
D
ROSS CITY OF
97 served27 historical records4 recent
C
STATE LINE WATER COOP INC
405 served5 historical records4 recent
C
KARLSRUHE CITY OF
82 served31 historical records3 recent
C
Large Systems With No Recent Records
FARGO CITY OF
120,762 served4 historical records
A
BISMARCK CITY OF
72,417 served0 historical records
A
GRAND FORKS REGIONAL WTP
57,339 served1 historical record
A
MINOT CITY OF
48,743 served3 historical records
A
WEST FARGO CITY OF
34,858 served0 historical records
A
WILLISTON CITY OF
26,426 served5 historical records
A
DICKINSON CITY OF
25,679 served4 historical records
A
MANDAN CITY OF
21,769 served0 historical records
A
JAMESTOWN CITY OF
15,427 served1 historical record
A
SOUTH CENTRAL RWD NORTH BURLEIGH
10,400 served0 historical records
A
Largest Water Systems in North Dakota
| Water System | Grade | Population | Historical Records |
|---|---|---|---|
| FARGO CITY OF | A | 120,762 | 4 |
| BISMARCK CITY OF | A | 72,417 | 0 |
| GRAND FORKS REGIONAL WTP | A | 57,339 | 1 |
| MINOT CITY OF | A | 48,743 | 3 |
| WEST FARGO CITY OF | A | 34,858 | 0 |
| WILLISTON CITY OF | A | 26,426 | 5 |
| DICKINSON CITY OF | A | 25,679 | 4 |
| MANDAN CITY OF | A | 21,769 | 0 |
| JAMESTOWN CITY OF | A | 15,427 | 1 |
| SOUTH CENTRAL RWD NORTH BURLEIGH | A | 10,400 | 0 |
| SOUTHWEST WATER AUTHORITY | A | 8,537 | 0 |
| WAHPETON CITY OF | A | 7,766 | 1 |
| NORTH PRAIRIE RWD-SYSTEM 1&2 | A | 7,748 | 0 |
| DEVILS LAKE CITY OF | A | 7,141 | 1 |
| VALLEY CITY CITY OF | A | 6,585 | 0 |
| WATFORD CITY CITY OF | A | 6,390 | 1 |
| EAST CENTRAL REGIONAL WD-GF | A | 5,995 | 1 |
| STUTSMAN RURAL WATER DISTRICT | A | 5,550 | 0 |
| GREATER RAMSEY WATER DISTRICT | A | 5,280 | 0 |
| NORTHWEST RURAL WATER DISTRICT | A | 5,102 | 1 |
Contaminants in North Dakota
Lead in North DakotaArsenic in North DakotaNitrate in North DakotaFluoride in North DakotaPFOS in North DakotaPFOA in North DakotaTHMs in North DakotaHAA5 in North Dakota
Cities in North Dakota
FARGO(1)BISMARCK(8)MINOT(6)GRAND FORKS(1)DICKINSON(6)WEST FARGO(1)WILLISTON(5)MANDAN(5)JAMESTOWN(2)DEVILS LAKE(5)VALLEY CITY(7)KINDRED(6)WAHPETON(2)WATFORD CITY(3)THOMPSON(2)GRAFTON(2)CAVALIER(3)BOTTINEAU(5)ABERCROMBIE(2)HILLSBORO(2)LANGDON(3)MANTADOR(2)LINCOLN(1)FESSENDEN(2)LISBON(2)GILBY(1)GARRISON(2)TIOGA(2)LAKOTA(2)TURTLE LAKE(4)BEULAH(1)RUGBY(1)FINLEY(3)CASSELTON(1)PETERSBURG(1)KENMARE(3)HAZEN(1)CARRINGTON(1)RAY(2)HORACE(5)MAYVILLE(1)OAKES(1)HARVEY(1)BOWMAN(1)FULLERTON(3)CROSBY(1)PARK RIVER(1)ELLENDALE(1)NEW ROCKFORD(1)SURREY(1)LARIMORE(1)ALEXANDER(1)MAPLETON(1)ROLLA(1)WASHBURN(1)HETTINGER(1)SHARON(2)STANLEY(1)CANDO(1)LINTON(1)VELVA(1)BURLINGTON(1)BELFIELD(1)WALHALLA(1)LAMOURE(2)COOPERSTOWN(1)BEACH(1)WISHEK(1)NEW SALEM(1)NORTHWOOD(1)KILLDEER(1)HANKINSON(1)ENDERLIN(2)LA MOURE(1)TRENTON(1)DRAYTON(1)GLEN ULLIN(1)NAPOLEON(1)MOHALL(1)UNDERWOOD(1)HATTON(1)DUNSEITH(1)MILNOR(2)GWINNER(1)ASHLEY(1)HEBRON(1)MOTT(1)HARWOOD(1)STEELE(1)WILTON(1)EDGELEY(2)LIDGERWOOD(1)ELGIN(1)PORTLAND(1)MINTO(1)NEW ENGLAND(1)PEMBINA(1)CENTER(1)RICHARDTON(1)FORMAN(1)