PFAS in Drinking Water


36% of Montana’s population served by public water supplies drink from systems tested during 2013-2015 under the Unregulated Contaminant Monitoring Regulation (UCMR3). All systems tested below the method reporting limit (MRL).

More information can be found at:

Below is the information for the Map.

MT0000235 City of Hardin HARDIN
MT0004313 Pipkin Commercial Subdivision BELGRADE
MT0004392 Cherry Creek Manuf. Home Park BILLINGS
MT0000328 City of Shelby SHELBY
MT0000590 Leisure Village MHP HLNA HELENA
MT0000165 Town of Bridger BRIDGER
MT0000155 County Water District of Billings Heights BILLINGS
MT0000161 City of Bozeman BOZEMAN
MT0000170 Butte Silverbow Water Department BUTTE
MT0000241 Helena Water System HELENA
MT0000259 Kalispell Public Worksn KALISPELL
MT0004204 University of Montana - Missoula MISSOULA
MT0000294 Mountain Water Company MISSOULA
MT0000525 City of Great Falls GREAT FALLS
MT0000153 City of Billings BILLINGS
Contaminants Tested (UCMR3) MRL μg/L
PFOS - Perfluorooctanesulfonic acid 0.04
PFOA – Perfluorooctanoic acid 0.02
PFNA- Perfluorononanoic acid 0.02
PFHxS- Perfluorohexanesulfonic acid 0.03
PFHpA- Perfluoroheptanoic acid 0.01
PFBS- Perfluorobutanesulfonic acid 0.09