Montana Water Quality
792 water systems serving 789,179 people. 19,012 total violations on record.
Safety Grade Distribution
A
319
40%
B
155
20%
C
266
34%
D
21
3%
F
31
4%
792
Water Systems
789,179
Population Served
19,012
Total Violations
1,210
Health-Based
Most Contaminated Systems
FISHERMANS VILLAGE SUBDIVISION
25 served327 violations316 recent
F
CASITAS DEL RIO
216 served169 violations169 recent
C
B & M ZOO SUBDIVISION
25 served150 violations150 recent
C
DENTON TOWN OF
255 served166 violations130 recent
F
MCDONALD TRAILER CT
75 served193 violations115 recent
D
COUNTRY HAVEN ESTATES WHISPERING PINES
100 served115 violations115 recent
C
BAKER CITY OF
1,858 served168 violations107 recent
C
GORE HILL COUNTY WATER DIST
500 served101 violations99 recent
C
TEN MILE AND PLEASANT VALLEY WUA
750 served109 violations98 recent
D
NORTH VALLEY COUNTY WATER AND SEWER DIST
450 served92 violations86 recent
C
Cleanest Water Systems
BILLINGS CITY OF
114,000 served0 violations
A
MISSOULA WATER
68,200 served25 violations
A
GREAT FALLS CITY OF
60,000 served5 violations
A
BOZEMAN CITY OF
56,000 served0 violations
A
KALISPELL PUBLIC WORKS
25,000 served51 violations
A
BELGRADE CITY OF
10,460 served7 violations
A
WHITEFISH CITY OF
10,418 served0 violations
A
LIVINGSTON CITY OF
7,500 served17 violations
A
BIGFORK COUNTY WATER AND SEWER
6,100 served2 violations
A
LOCKWOOD WATER AND SEWER DISTRICT
5,900 served1 violations
A
Largest Water Systems in Montana
| Water System | Grade | Population | Violations |
|---|---|---|---|
| BILLINGS CITY OF | A | 114,000 | 0 |
| MISSOULA WATER | A | 68,200 | 25 |
| GREAT FALLS CITY OF | A | 60,000 | 5 |
| BOZEMAN CITY OF | A | 56,000 | 0 |
| BUTTE SILVERBOW WATER DEPT | C | 33,000 | 10 |
| HELENA WATER SYSTEM | F | 32,091 | 18 |
| KALISPELL PUBLIC WORKS | A | 25,000 | 51 |
| CO WATER DIST OF BILLINGS HEIGHTS | C | 12,000 | 3 |
| BELGRADE CITY OF | A | 10,460 | 7 |
| WHITEFISH CITY OF | A | 10,418 | 0 |
| HAVRE CITY OF | F | 9,921 | 28 |
| WEST YELLOWSTONE TOWN OF | B | 9,899 | 54 |
| MILES CITY CITY OF | F | 9,565 | 18 |
| MALMSTROM AIR FORCE BASE | C | 8,850 | 18 |
| FLATHEAD COUNTY WATER AND SEWER | B | 7,775 | 9 |
| LIVINGSTON CITY OF | A | 7,500 | 17 |
| ANACONDA WATER DEPARTMENT | B | 6,750 | 2 |
| LAUREL MUNICIPAL WATER SYSTEM | C | 6,339 | 6 |
| BIGFORK COUNTY WATER AND SEWER | A | 6,100 | 2 |
| LEWISTOWN CITY OF | B | 5,923 | 64 |
Contaminants in Montana
Cities in Montana
BILLINGS(37)MISSOULA(75)BOZEMAN(27)GREAT FALLS(18)KALISPELL(70)HELENA(38)BUTTE(2)BELGRADE(13)WHITEFISH(7)MILES CITY(5)HAVRE(5)WEST YELLOWSTONE(4)ANACONDA(4)MALMSTROM AIR FORCE BASE(1)COLUMBIA FALLS(27)BIGFORK(17)LIVINGSTON(5)GLENDIVE(5)LAUREL(5)EAST HELENA(18)HAMILTON(10)POLSON(10)LEWISTOWN(4)BIG SKY(12)LIBBY(8)DILLON(7)SIDNEY(3)DEER LODGE(2)CUT BANK(9)SHELBY(3)GLASGOW(3)CULBERTSON(2)LOLO(5)HARDIN(2)RONAN(4)ROUNDUP(3)CONRAD(3)EUREKA(4)STEVENSVILLE(7)TROY(3)OREM(4)MANHATTAN(7)COLSTRIP(1)FORSYTH(1)RED LODGE(3)THOMPSON FALLS(3)TOWNSEND(3)PABLO(1)BAKER(3)COLUMBUS(4)LAKESIDE(7)CHOTEAU(3)THREE FORKS(1)MALTA(2)HINGHAM(1)BIG TIMBER(2)PLAINS(1)PLENTYWOOD(1)BLACK EAGLE(2)LINCOLN(4)WEST GLACIER(3)ENNIS(2)FORT BENTON(2)SEELEY LAKE(1)CHESTER(6)VIRGINIA CITY(1)WHITEHALL(1)CLANCY(9)BOULDER(1)CHINOOK(2)PHILIPSBURG(1)FORT SMITH(3)FORT HARRISON(1)HARLOWTON(3)GARDINER(5)HUNGRY HORSE(1)DARBY(2)ABSAROKEE(1)SUPERIOR(1)WHITE SULPHUR SPRINGS(2)ASHLAND(2)SOMERS(2)SCOBEY(1)CIRCLE(2)FAIRVIEW(1)SUNBURST(4)DALLAS(3)BRADY(2)HARLEM(2)VALIER(4)BRIDGER(2)PINESDALE(1)ST IGNATIUS(2)POWER(3)WARM SPRINGS(1)BELT(2)CASCADE(2)GALLATIN GATEWAY(2)FAIRFIELD(1)HUNTLEY(2)