What is PFAS?
Water suppliers
PFAS value per supplier, 2023–2025. EPA limit — 4 ppt (0.004 µg/L) for PFOA and PFOS, set in 2024. Suppliers that detected PFOA or PFOS
are highlighted and listed first. “Not detected” means the contaminant was measured but
not found.
| Supplier | City | Population | PFAS (ug/L) |
|---|---|---|---|
| Kalispell Public Works | Kalispell | 25,000 | 0.0066 µg/L |
| Alpine Village Wua | Whitefish | 125 | 0.0041 µg/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 | 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 |