Montana tap water quality
818 community water systems
3.8%
exceed lead action level
(30/800 systems)
(30/800 systems)
5%
PFOA/PFOS detected
(2/40 systems)
(2/40 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) |
|---|---|---|---|
| BILLINGS CITY OF | BILLINGS | 114,000 | 0.0118 mg/L |
| MISSOULA WATER | MISSOULA | 68,200 | 0.0062 mg/L |
| GREAT FALLS CITY OF | GREAT FALLS | 60,000 | 0.0090 mg/L |
| BOZEMAN CITY OF | BOZEMAN | 56,000 | 0.0077 mg/L |
| BUTTE SILVERBOW WATER DEPT | BUTTE | 33,000 | 0.0120 mg/L |
| HELENA WATER SYSTEM | HELENA | 32,091 | 0.0052 mg/L |
| KALISPELL PUBLIC WORKS | KALISPELL | 25,000 | 0.0127 mg/L |
| BILLINGS HEIGHTS CO WATER DIST OF | BILLINGS | 12,000 | 0.0060 mg/L |
| BELGRADE CITY OF | BELGRADE | 10,460 | 0.0034 mg/L |
| WHITEFISH CITY OF | WHITEFISH | 10,418 | 0.0114 mg/L |
| HAVRE CITY OF | HAVRE | 9,921 | 0.0050 mg/L |
| WEST YELLOWSTONE TOWN OF | WEST YELLOWSTONE | 9,899 | 0.0066 mg/L |
| MILES CITY CITY OF | MILES CITY | 9,565 | 0.0042 mg/L |
| MALMSTROM AIR FORCE BASE | GREAT FALLS | 8,850 | 0.0051 mg/L |
| FLATHEAD COUNTY WATER AND SEWER | KALISPELL | 7,775 | 0.0050 mg/L |
| LIVINGSTON CITY OF | LIVINGSTON | 7,500 | 0.0056 mg/L |
| ANACONDA WATER DEPARTMENT | ANACONDA | 6,750 | 0.0088 mg/L |
| LAUREL MUNICIPAL WATER SYSTEM | LAUREL | 6,339 | 0.0182 mg/L |
| BIGFORK COUNTY WATER AND SEWER | BIGFORK | 6,100 | 0.0050 mg/L |
| LEWISTOWN CITY OF | LEWISTOWN | 5,923 | 0.0050 mg/L |
| LOCKWOOD WATER AND SEWER DISTRICT | BILLINGS | 5,900 | 0.0078 mg/L |
| HAMILTON CITY OF | HAMILTON | 5,660 | 0.0060 mg/L |
| POLSON CITY OF | POLSON | 5,300 | 0.0060 mg/L |
| SIDNEY CITY OF | SIDNEY | 5,000 | 0.0090 mg/L |
| LIBBY CITY OF | LIBBY | 4,892 | 0.0180 mg/L |
| GLENDIVE CITY OF | GLENDIVE | 4,873 | 0.0120 mg/L |
| TOWN OF BROWNING | 4,671 | 0.0030 mg/L | |
| COLUMBIA FALLS CITY OF | COLUMBIA FALLS | 4,450 | 0.0080 mg/L |
| NORTH STAR ZOOT WATER | BOZEMAN | 4,323 | 0.0085 mg/L |
| DILLON CITY OF | DILLON | 4,300 | 0.0050 mg/L |
| RIVER ROCK COUNTY WATER AND SEWER DIST | BELGRADE | 4,200 | 0.0168 mg/L |
| BIG SKY COUNTY WATER AND SEWER DIST 363 | BIG SKY | 4,132 | 0.0092 mg/L |
| SHELBY CITY OF | SHELBY | 3,970 | 0.0066 mg/L |
| HARDIN CITY OF | HARDIN | 3,500 | 0.0090 mg/L |
| LOLO WATER AND SEWER DIST | LOLO | 3,315 | 0.0054 mg/L |
| GLASGOW CITY OF | GLASGOW | 3,253 | 0.0060 mg/L |
| CUT BANK CITY OF | CUT BANK | 3,105 | 0.0040 mg/L |
| POPLAR, CITY OF | 3,025 | 0.0090 mg/L | |
| DRY PRAIRIE RURAL WATER AUTHORITY | CULBERTSON | 3,005 | 0.0049 mg/L |
| WOLF POINT CITY OF | 3,000 | 0.0030 mg/L | |
| DEER LODGE CITY OF | DEER LODGE | 2,900 | 0.0039 mg/L |
| LAME DEER WATER SYSTEM | 2,605 | 0.0070 mg/L | |
| FORT BELKNAP AGENCY WATER SYSTEM | 2,600 | 0.0046 mg/L | |
| CONRAD WATER DEPT | CONRAD | 2,500 | 0.0040 mg/L |
| RONAN CITY OF | RONAN | 2,483 | 0.0059 mg/L |
| BIG MOUNTAIN WATER COMPANY | WHITEFISH | 2,435 | 0.0120 mg/L |
| COLSTRIP CITY OF | COLSTRIP | 2,350 | 0.0088 mg/L |
| RAE WATER AND SEWER DIST 313 | BOZEMAN | 2,325 | 0.0045 mg/L |
| FORSYTH CITY OF | FORSYTH | 2,260 | 0.0050 mg/L |
| PABLO LAKE COUNTY WATER AND SEWER DIST | PABLO | 2,175 | 0.0050 mg/L |
| EAST HELENA CITY OF | HELENA | 2,114 | 0.0050 mg/L |
| TROY CITY OF | TROY | 2,100 | 0.0098 mg/L |
| MONTANA STATE PRISON | DEER LODGE | 2,100 | 0.0050 mg/L |
| STEVENSVILLE TOWN OF | STEVENSVILLE | 2,090 | 0.0050 mg/L |
| CROW AGENCY WATER SYSTEM | 2,057 | 0.0022 mg/L | |
| ROCKY BOY'S RURAL WATER | 2,000 | 0.0029 mg/L | |
| TOWNSEND CITY OF | TOWNSEND | 2,000 | 0.0108 mg/L |
| RED LODGE WATER DEPT | RED LODGE | 2,000 | 0.0087 mg/L |
| EASTGATE VILLAGE SEWER AND WATER | EAST HELENA | 2,000 | 0.0038 mg/L |
| EUREKA TOWN OF | EUREKA | 1,995 | 0.0088 mg/L |
| FAIRMONT HOT SPRINGS RESORT | ANACONDA | 1,965 | 0.0059 mg/L |
| THOMPSON FALLS CITY OF | THOMPSON FALLS | 1,950 | 0.0050 mg/L |
| ROUNDUP WATER DEPARTMENT | ROUNDUP | 1,900 | 0.0194 mg/L |
| COLUMBUS TOWN OF | COLUMBUS | 1,900 | 0.0089 mg/L |
| THREE FORKS CITY OF | THREE FORKS | 1,900 | 0.0050 mg/L |
| BAKER CITY OF | BAKER | 1,858 | 0.0116 mg/L |
| MALTA CITY OF | MALTA | 1,800 | 0.0050 mg/L |
| MANHATTAN TOWN OF | MANHATTAN | 1,800 | 0.0078 mg/L |
| SUN PRAIRIE VILLAGE COUNTY | GREAT FALLS | 1,800 | 0.0060 mg/L |
| ASSINIBOINE & SIOUX RURAL WATER SYSTEM | 1,726 | 0.0080 mg/L | |
| HILL COUNTY WATER DISTRICTS | HAVRE | 1,720 | 0.0057 mg/L |
| PLENTYWOOD WATER DEPARTMENT | PLENTYWOOD | 1,700 | 0.0097 mg/L |
| PLAINS TOWN OF | PLAINS | 1,700 | 0.0130 mg/L |
| CHOTEAU CITY OF | CHOTEAU | 1,691 | 0.0079 mg/L |
| BIG TIMBER CITY OF | BIG TIMBER | 1,650 | 0.0077 mg/L |
| SEELEY LAKE WATER DISTRICT | SEELEY LAKE | 1,575 | 0.0240 mg/L |
| TWO MEDICINE WATER - EAST GLACIER | 1,504 | 0.0030 mg/L | |
| FORT BENTON CITY OF | FORT BENTON | 1,500 | 0.0066 mg/L |
| VIRGINIA CITY WATER DEPT | VIRGINIA CITY | 1,500 | 0.0050 mg/L |
| WHITEHALL TOWN OF | WHITEHALL | 1,500 | 0.0050 mg/L |
| ROCKY BOY AGENCY WATER SYSTEM | 1,442 | 0.0068 mg/L | |
| ENNIS TOWN OF | ENNIS | 1,400 | 0.0052 mg/L |
| BOULDER CITY OF | BOULDER | 1,400 | 0.0070 mg/L |
| PHILIPSBURG TOWN OF | PHILIPSBURG | 1,360 | 0.0120 mg/L |
| EL MAR ESTATES MSLA CO WATER | FRENCHTOWN | 1,350 | 0.0042 mg/L |
| CHINOOK CITY OF | CHINOOK | 1,300 | 0.0078 mg/L |
| VA MEDICAL CENTER HELENA | FORT HARRISON | 1,275 | 0.0220 mg/L |
| BLACK EAGLE CASCADE COUNTY WATER SEWER | BLACK EAGLE | 1,233 | 0.0038 mg/L |
| LAKESIDE WATER SYSTEM | LAKESIDE | 1,225 | 0.0060 mg/L |
| FOREST PARK WATER RSID 24 | GLENDIVE | 1,200 | 0.0053 mg/L |
| HELENA LEISURE LLC | HELENA | 1,200 | 0.0040 mg/L |
| HUNGRY HORSE CO WATER AND SEWER DISTRICT | HUNGRY HORSE | 1,135 | 0.0050 mg/L |
| ABSAROKEE WATER AND SEWER DIST | ABSAROKEE | 1,100 | 0.0058 mg/L |
| SUPERIOR TOWN OF | SUPERIOR | 1,100 | 0.0050 mg/L |
| CMRWA MUSSELSHELL JUDITH RURAL WATER SYS | HARLOWTON | 1,100 | — |
| HARLOWTON CITY OF | HARLOWTON | 1,050 | 0.0090 mg/L |
| ST MARY HEADQUARTERS AND CG | WEST GLACIER | 1,030 | 0.0098 mg/L |
| SCOBEY CITY OF | SCOBEY | 1,026 | 0.0083 mg/L |
| WHITE SULPHUR SPRINGS CITY OF | WHITE SULPHUR SPRINGS | 1,000 | 0.0090 mg/L |
| FAIRVIEW TOWN OF | FAIRVIEW | 1,000 | 0.0050 mg/L |