PFAS in Montana drinking water
40 community water systems tested
5%
of tested systems detected PFOA or PFOS
(2/40)
(2/40)
Water systems
PFAS value per system, 2023–2025. EPA limit — 4 ppt (0.004 µg/L) for PFOA and PFOS, set in 2024. Systems that detected PFOA or PFOS
are highlighted and listed first. “Not detected” means the contaminant was measured but
not found.
| System | City | Population | PFAS (ug/L) |
|---|---|---|---|
| KALISPELL PUBLIC WORKS | KALISPELL | 25,000 | 0.0066 ug/L |
| ALPINE VILLAGE WUA | WHITEFISH | 125 | 0.0041 ug/L |
| BILLINGS CITY OF | BILLINGS | 114,000 | Not detected |
| MISSOULA WATER | MISSOULA | 68,200 | Not detected |
| GREAT FALLS CITY OF | GREAT FALLS | 60,000 | Not detected |
| BOZEMAN CITY OF | BOZEMAN | 56,000 | Not detected |
| BUTTE SILVERBOW WATER DEPT | BUTTE | 33,000 | Not detected |
| HELENA WATER SYSTEM | HELENA | 32,091 | Not detected |
| BILLINGS HEIGHTS CO WATER DIST OF | BILLINGS | 12,000 | Not detected |
| BELGRADE CITY OF | BELGRADE | 10,460 | Not detected |
| WHITEFISH CITY OF | WHITEFISH | 10,418 | Not detected |
| HAVRE CITY OF | HAVRE | 9,921 | Not detected |
| WEST YELLOWSTONE TOWN OF | WEST YELLOWSTONE | 9,899 | Not detected |
| MILES CITY CITY OF | MILES CITY | 9,565 | Not detected |
| MALMSTROM AIR FORCE BASE | GREAT FALLS | 8,850 | Not detected |
| FLATHEAD COUNTY WATER AND SEWER | KALISPELL | 7,775 | Not detected |
| LIVINGSTON CITY OF | LIVINGSTON | 7,500 | Not detected |
| ANACONDA WATER DEPARTMENT | ANACONDA | 6,750 | Not detected |
| LAUREL MUNICIPAL WATER SYSTEM | LAUREL | 6,339 | Not detected |
| BIGFORK COUNTY WATER AND SEWER | BIGFORK | 6,100 | Not detected |
| LEWISTOWN CITY OF | LEWISTOWN | 5,923 | Not detected |
| LOCKWOOD WATER AND SEWER DISTRICT | BILLINGS | 5,900 | Not detected |
| HAMILTON CITY OF | HAMILTON | 5,660 | Not detected |
| POLSON CITY OF | POLSON | 5,300 | Not detected |
| SIDNEY CITY OF | SIDNEY | 5,000 | Not detected |
| LIBBY CITY OF | LIBBY | 4,892 | Not detected |
| GLENDIVE CITY OF | GLENDIVE | 4,873 | Not detected |
| TOWN OF BROWNING | 4,671 | Not detected | |
| COLUMBIA FALLS CITY OF | COLUMBIA FALLS | 4,450 | Not detected |
| DILLON CITY OF | DILLON | 4,300 | Not detected |
| RIVER ROCK COUNTY WATER AND SEWER DIST | BELGRADE | 4,200 | Not detected |
| BIG SKY COUNTY WATER AND SEWER DIST 363 | BIG SKY | 4,132 | Not detected |
| SHELBY CITY OF | SHELBY | 3,970 | Not detected |
| HARDIN CITY OF | HARDIN | 3,500 | Not detected |
| SUN PRAIRIE VILLAGE COUNTY | GREAT FALLS | 1,800 | Not detected |
| PHANTOM HILLS WATER SYSTEM | MISSOULA | 810 | Not detected |
| PINESDALE TOWN OF | PINESDALE | 800 | Not detected |
| FAIRFIELD TOWN OF | FAIRFIELD | 718 | Not detected |
| BIG PINES TRAILER COURT | MISSOULA | 78 | Not detected |
| BLACK ROCK ESTATES SUBDIVISION | BILLINGS | 75 | Not detected |