Water Quality · Nevada
Best Water Quality Counties in Nevada 2026
Ranked by EPA drinking water health violations.
Top 10 — Water Quality in Nevada
Score reflects water quality only — not overall county quality.
All Nevada Counties — Water Quality Rankings
16 counties ranked by water quality score. Overall Score shown for context.
| # | County | Water Quality Score | Overall Score |
|---|---|---|---|
| 1 | Elko County, NV | 86 | 42.7 |
| 2 | Lincoln County, NV | 86 | 74.7 |
| 3 | Pershing County, NV | 86 | 72.3 |
| 4 | Storey County, NV | 86 | 53.9 |
| 5 | Clark County, NV | 64.4 | 31.3 |
| 6 | White Pine County, NV | 52.9 | 59.8 |
| 7 | Lyon County, NV | 47.3 | 42.4 |
| 8 | Mineral County, NV | 43.5 | 47.9 |
| 9 | Humboldt County, NV | 38.6 | 42.6 |
| 10 | Douglas County, NV | 37.7 | 50.2 |
| 11 | Washoe County, NV | 35.4 | 34.2 |
| 12 | Churchill County, NV | 30.6 | 42.1 |
| 13 | Lander County, NV | 29.6 | 39.6 |
| 14 | Eureka County, NV | 23.3 | 44.9 |
| 15 | Esmeralda County, NV | 14.6 | 67 |
| 16 | Nye County, NV | 14.5 | 36.1 |