CheckPFAS

By State · MT

PFAS in Montana water

Based on EPA UCMR 5 testing of 28 public water systems with PFAS detected in Montana.

See Montana on the national heatmap
Systems tested in state
28
With PFAS detected
28
Above EPA limits
2 (7%)

State totals reflect systems with at least one PFAS detection in UCMR 5 (the canonical EPA dataset). The 6,151 national total includes ~123 additional systems in US territories and on tribal lands not browsable as state pages.

Most contaminated in Montana

2 Montana water systems tested above EPA PFAS limits. The most severe is KALISPELL PUBLIC WORKS, where PFOS measured 6.6 ppt — 1.6× the federal limit.

See KALISPELL PUBLIC WORKS → National rankings →

State context

How PFAS shows up in Montana

Industrial context

Montana's PFAS exposure is limited compared to industrial states; primary sources are AFFF impacts at the former Malmstrom AFB (Great Falls) and the Montana Air National Guard fire-training site.

Regulatory stance

Montana follows the federal EPA framework with no state-level MCL.

Notable sites

Malmstrom AFB is on the DoD's PFAS investigation list.

Editorial summary compiled from public DoD, EPA, and state agency disclosures. Not a comprehensive site inventory — for the authoritative list of PFAS investigation locations in Montana, consult your state environmental agency.

Most Commonly Detected PFAS in Montana

Systems with detections · EPA UCMR 5 (2023–2025)

lithium 24 systems
PFBS 2 systems
PFOS 2 systems
PFHxS 1 system
PFBA 1 system

Check your Montana ZIP code

Get specific results for your neighborhood's water utility.

Browse Montana by city

5 cities

City overviews aggregate every utility and ZIP code in the area. Don't see your city? Use the ZIP lookup above — every Montana ZIP has a result.

  1. Missoula 2 utils · 7 ZIPs
  2. Billings 6 utils · 6 ZIPs
  3. Great Falls 2 utils · 4 ZIPs
  4. Kalispell 1 util · 3 ZIPs
  5. Helena 1 util · 2 ZIPs

Water Systems in Montana (28)

Water System ↕ PWSID PFAS Detected ↕ Above MCL ↕ Risk
KALISPELL PUBLIC WORKS
Groundwater
 MT0000259 2 1
High Risk
ALPINE VILLAGE WUA
Groundwater
 MT0003229 1 1
High Risk
MALMSTROM AIR FORCE BASE
Surface Water
 MT0000515 2 0
Low Level
BILLINGS CITY OF
Surface Water
 MT0000153 1 0
Low Level
CO WATER DIST OF BILLINGS HEIGHTS
Surface Water
 MT0000155 1 0
Low Level
LOCKWOOD WATER AND SEWER DISTRICT
Surface Water
 MT0000156 1 0
Low Level
DILLON CITY OF
Groundwater
 MT0000201 1 0
Low Level
FAIRFIELD TOWN OF
Groundwater
 MT0000212 1 0
Low Level
GLENDIVE CITY OF
Surface Water
 MT0000229 1 0
Low Level
HAMILTON CITY OF
Groundwater
 MT0000234 1 0
Low Level
HARDIN CITY OF
Surface Water
 MT0000235 1 0
Low Level
HELENA WATER SYSTEM
Surface Water
 MT0000241 1 0
Low Level
BIGFORK COUNTY WATER AND SEWER
Groundwater
 MT0000262 1 0
Low Level
LAUREL MUNICIPAL WATER SYSTEM
Surface Water
 MT0000270 1 0
Low Level
MILES CITY CITY OF
Surface Water
 MT0000291 1 0
Low Level
MISSOULA WATER
Groundwater
 MT0000294 1 0
Low Level
SHELBY CITY OF
Groundwater
 MT0000328 1 0
Low Level
SIDNEY CITY OF
Groundwater
 MT0000330 1 0
Low Level
HAVRE CITY OF
Surface Water
 MT0000524 1 0
Low Level
GREAT FALLS CITY OF
Surface Water
 MT0000525 1 0
Low Level
LIVINGSTON CITY OF
Groundwater
 MT0000573 1 0
Low Level
BIG SKY COUNTY WATER AND SEWER DIST 363
Groundwater
 MT0002385 1 0
Low Level
PINESDALE TOWN OF
Groundwater
 MT0002926 1 0
Low Level
WEST YELLOWSTONE TOWN OF
Groundwater
 MT0003136 1 0
Low Level
UNIVERSITY OF MONTANA
Groundwater
 MT0004204 1 0
Low Level
MONTANA STATE UNIVERSITY BILLINGS
Surface Water
 MT0004788 1 0
Low Level
ROCKY MOUNTAIN COLLEGE
Surface Water
 MT0004796 1 0
Low Level
BLACK ROCK ESTATES SUBDIVISION
Groundwater
 MT0004881 1 0
Low Level

Click any row to see ZIP-level details. Click PWSID to see the full utility page.

Test your water

How to get your Montana water tested for PFAS

EPA UCMR 5 tested 28 public water systems in Montana — but at the utility entry point, not your tap. Aging pipes and indoor plumbing can change what reaches your home, and private wells aren't covered by UCMR 5 at all. To find out what's actually in your water, test it with a certified lab.

  1. 01

    How PFAS water testing works

    EPA Method 537.1 in plain English — what a certified lab actually measures

    →
  2. 02

    Order a certified mail-in test kit

    PFAS mail-in kits from about $85 (Cyclopure, Tap Score)

    →
  3. 03

    On a private well in Montana?

    Wells aren't covered by EPA testing — your own testing guide

    →

Montana testing resources

State agency
Montana Department of Environmental Quality (DEQ), Public Water Supply Bureau · state PFAS page
PFAS limits
Montana follows the federal EPA limits and is adopting the 2024 federal standards into rule.
State help
DEQ sampled 19 public systems in 2022; no ongoing free residential well-testing program.

Compiled from official Montana state sources. Programs and eligibility change — confirm current details with the agency.