Water Quality · Wyoming
Best Water Quality Counties in Wyoming 2026
Ranked by EPA drinking water health violations.
Top 10 — Water Quality in Wyoming
Score reflects water quality only — not overall county quality.
All Wyoming Counties — Water Quality Rankings
23 counties ranked by water quality score. Overall Score shown for context.
| # | County | Water Quality Score | Overall Score |
|---|---|---|---|
| 1 | Washakie County, WY | 86 | 64.6 |
| 2 | Albany County, WY | 66.2 | 48.2 |
| 3 | Park County, WY | 59 | 57.8 |
| 4 | Sheridan County, WY | 58.4 | 50.1 |
| 5 | Campbell County, WY | 52.9 | 46.4 |
| 6 | Converse County, WY | 47.9 | 58.8 |
| 7 | Laramie County, WY | 46.7 | 40.1 |
| 8 | Hot Springs County, WY | 44.6 | 56.5 |
| 9 | Sweetwater County, WY | 43.8 | 50.1 |
| 10 | Natrona County, WY | 43.6 | 55.2 |
| 11 | Uinta County, WY | 40.2 | 52.4 |
| 12 | Weston County, WY | 40 | 59.2 |
| 13 | Big Horn County, WY | 37.6 | 62.6 |
| 14 | Sublette County, WY | 33.4 | 67.4 |
| 15 | Teton County, WY | 30.2 | 62.4 |
| 16 | Platte County, WY | 28.9 | 65.9 |
| 17 | Crook County, WY | 25.6 | 64.6 |
| 18 | Fremont County, WY | 25.6 | 49.2 |
| 19 | Lincoln County, WY | 10 | 65.1 |
| 20 | Johnson County, WY | 8.3 | 55.6 |
| 21 | Goshen County, WY | 6.3 | 53.7 |
| 22 | Carbon County, WY | 3.9 | 62.4 |
| 23 | Niobrara County, WY | 2 | 51.9 |