88 cities covered
Wyoming water quality, by city
Wyoming cities of 10,000+
| City | Disinfectant | Hardness | Lead | PFAS | Radon |
|---|---|---|---|---|---|
| Cheyenne | Chlorine | 2.9 gpg | 15 ppb | Not detected | High |
| Casper | Chloramine | 19.1 gpg | 1 ppb | Not detected | High |
| Gillette | Chlorine | No data | 2 ppb | Not detected | High |
| Laramie | Chlorine | No data | 1.3 ppb | Not detected | High |
| Rock Springs | Chlorine | No data | 3 ppb | Not detected | High |
| Sheridan | Chlorine | 1.6 gpg | Not detected | Not detected | High |
| Evanston | Chlorine | No data | 0.7 ppb | Not detected | High |
| Green River | Chlorine | 11.7 gpg | 2 ppb | Not detected | High |
| Riverton | Chlorine | No data | 3 ppb | PFOS | High |
| Jackson | Chlorine | 9.5 gpg | 1 ppb | Detected | High |
| Cody | Chloramine | No data | Not detected | Not detected | High |
Smaller Wyoming towns
77 more covered towns, each with its own page.
- Afton
- Albin
- Alpine
- Baggs
- Bar Nunn
- Basin
- Bear River
- Big Piney
- Buffalo
- Burlington
- Burns
- Byron
- Chugwater
- Clearmont
- Cokeville
- Cowley
- Dayton
- Deaver
- Diamondville
- Douglas
- Dubois
- East Thermopolis
- Edgerton
- Elk Mountain
- Encampment
- Evansville
- Fort Laramie
- Frannie
- Glendo
- Glenrock
- Greybull
- Guernsey
- Hanna
- Hudson
- Hulett
- Kaycee
- Kemmerer
- La Barge
- LaGrange
- Lander
- Lingle
- Lovell
- Lusk
- Lyman
- Marbleton
- Medicine Bow
- Meeteetse
- Midwest
- Mills
- Moorcroft
- Mountain View
- Newcastle
- Pavillion
- Pine Bluffs
- Pine Haven
- Pinedale
- Powell
- Ranchester
- Rawlins
- Rock River
- Rolling Hills
- Saratoga
- Shoshoni
- Sinclair
- Star Valley Ranch
- Sundance
- Superior
- Ten Sleep
- Thayne
- Thermopolis
- Torrington
- Upton
- Wamsutter
- Wheatland
- Worland
- Wright
- Yoder
What the data shows across Wyoming
Chlorine or chloramine
10 of 88 covered cities use chloramine in at least part of the system: Casper, Cody, Powell, Bar Nunn, Lovell, Byron and 4 more. Most cheap shower filters barely affect chloramine; look for vitamin C or catalytic carbon media.
Shower filters that handle chloramineHardness
3 of 5 cities with a hardness reading have hard or very hard water. Readings run from 1.6 grains per gallon in Sheridan (soft) to 19.1 in Casper (very hard).
Softener or filter?Lead
6 cities' utilities reported a 90th-percentile lead result of 5 ppb or more: Cheyenne, Torrington, Star Valley Ranch, Baggs, Fort Laramie and Chugwater. Lead comes from service lines and plumbing, so a home test is the reading that counts.
PFAS
EPA's nationwide sampling found PFAS above a 2024 EPA limit, in at least one sample, in the water serving Riverton, and below the limits in 1 more.