Wyoming Water Quality
Drinking water data for all 23 counties.
Avg Water Score
36.6
State Grade
F
Counties with Data
23
of 23 total
All Wyoming Counties
| County | Water Score |
|---|---|
| Washakie County | 86.0 |
| Albany County | 66.2 |
| Park County | 59.0 |
| Sheridan County | 58.4 |
| Campbell County | 52.9 |
| Converse County | 47.9 |
| Laramie County | 46.7 |
| Hot Springs County | 44.6 |
| Sweetwater County | 43.8 |
| Natrona County | 43.6 |
| Uinta County | 40.2 |
| Weston County | 40.0 |
| Big Horn County | 37.6 |
| Sublette County | 33.4 |
| Teton County | 30.2 |
| Platte County | 28.9 |
| Crook County | 25.6 |
| Fremont County | 25.6 |
| Lincoln County | 10.0 |
| Johnson County | 8.3 |
| Goshen County | 6.3 |
| Carbon County | 3.9 |
| Niobrara County | 2.0 |
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Frequently Asked Questions
Which county in Wyoming has the best water quality?
Washakie County has the highest water quality score in Wyoming at 86.0/100 (Grade: A), based on EPA SDWIS data.
Which county in Wyoming has the most water violations?
Niobrara County has among the lowest water quality scores in Wyoming at 2.0/100. See the individual county page for detailed violation history.
Is the tap water safe to drink in Wyoming?
Wyoming has an average water quality score of 36.6/100 based on EPA Safe Drinking Water Act compliance data. Individual county scores vary — check your specific county's page for detailed information.
What contaminants are found in Wyoming water supplies?
Drinking water quality varies by county and water system. The EPA Safe Drinking Water Information System (SDWIS) tracks violations for contaminants like lead, nitrates, bacteria, and disinfection byproducts. See individual county pages for specific contaminant and violation history.
Data Source
Water quality data sourced from the EPA Safe Drinking Water Information System (SDWIS) via the ECHO enforcement database. Scores reflect compliance history and health-based violation counts.
Disclaimer: This data is informational only. It is not health, legal, or professional advice. For concerns about your specific water supply, contact your local water utility.