CheckPFAS

By State · WY

PFAS in Wyoming water

Based on EPA UCMR 5 testing of 18 public water systems with PFAS detected in Wyoming.

See Wyoming on the national heatmap
Systems tested in state
18
With PFAS detected
18
Above EPA limits
1 (6%)

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 Wyoming

1 Wyoming water system tested above EPA PFAS limits. The most severe is RIVERTON, CITY OF, where PFHxS measured 37.0 ppt — 3.7× the federal limit.

See RIVERTON, CITY OF → National rankings →

State context

How PFAS shows up in Wyoming

Industrial context

Wyoming has limited industrial PFAS exposure; primary sources are AFFF impacts at the former Francis E. Warren AFB fire-training site (Cheyenne).

Regulatory stance

Wyoming follows the federal EPA framework.

Notable sites

Francis E. Warren 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 Wyoming, consult your state environmental agency.

Most Commonly Detected PFAS in Wyoming

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

lithium 18 systems
PFHxS 2 systems
PFBA 2 systems
PFOS 1 system
PFHxA 1 system
PFPeA 1 system

Check your Wyoming ZIP code

Get specific results for your neighborhood's water utility.

Browse Wyoming by city

4 cities

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

  1. Cheyenne 1 util · 3 ZIPs
  2. Casper 2 utils · 3 ZIPs
  3. Gillette 1 util · 2 ZIPs
  4. Jackson 1 util · 2 ZIPs

Water Systems in Wyoming (18)

Water System ↕ PWSID PFAS Detected ↕ Above MCL ↕ Risk
RIVERTON, CITY OF
Groundwater
 WY5600047 9 2
High Risk
DOUGLAS, CITY OF
Groundwater
 WY5600137 2 0
Low Level
JACKSON, TOWN OF
Groundwater
 WY5600213 2 0
Low Level
CHEYENNE BOARD OF PUBLIC UTILITIES
MX
 WY5600011 1 0
Low Level
GILLETTE, CITY OF
Groundwater
 WY5600019 1 0
Low Level
MILLS, TOWN OF
GU
 WY5600036 1 0
Low Level
RAWLINS WATER SUPPLY, CITY OF
Surface Water
 WY5600045 1 0
Low Level
WARDWELL WATER & SEWER DISTRICT
Surface Water
 WY5600067 1 0
Low Level
TORRINGTON MUNICIPAL WS
Groundwater
 WY5600164 1 0
Low Level
WHEATLAND, TOWN OF
Groundwater
 WY5600187 1 0
Low Level
FIRST FIKE SUBDIVISION
Groundwater
 WY5600194 1 0
Low Level
NEWCASTLE, CITY OF
Groundwater
 WY5600256 1 0
Low Level
BLACK THUNDER COAL MINE
Groundwater
 WY5600360 1 0
Low Level
GREEN RIVER, CITY OF
Surface Water
 WY5601181 1 0
Low Level
ROCK SPRINGS, CITY OF
Surface Water
 WY5601182 1 0
Low Level
CASPER, CITY OF
GU
 WY5601415 1 0
Low Level
YNP-CANYON VILLAGE
Surface Water
 WY5680074 1 0
Low Level
YNP-OLD FAITHFUL
Surface Water
 WY5680085 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 Wyoming water tested for PFAS

EPA UCMR 5 tested 18 public water systems in Wyoming — 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 Wyoming?

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

    →

Wyoming testing resources

State agency
Wyoming Department of Environmental Quality, Water Quality Division (WDEQ) · state PFAS page
PFAS limits
Wyoming has no PFAS standards of its own and follows the federal EPA MCLs.
State help
Free WDEQ's PFAS Monitoring Assistance Program provides FREE PFAS testing to public water systems AND to private-well owners. Program details →

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