Nevada Water Quality
Drinking water data for all 17 counties.
Avg Water Score
48.5
State Grade
D
Counties with Data
16
of 17 total
All Nevada Counties
| County | Water Score |
|---|---|
| Elko County | 86.0 |
| Lincoln County | 86.0 |
| Pershing County | 86.0 |
| Storey County | 86.0 |
| Clark County | 64.4 |
| White Pine County | 52.9 |
| Lyon County | 47.3 |
| Mineral County | 43.5 |
| Humboldt County | 38.6 |
| Douglas County | 37.7 |
| Washoe County | 35.4 |
| Churchill County | 30.6 |
| Lander County | 29.6 |
| Eureka County | 23.3 |
| Esmeralda County | 14.6 |
| Nye County | 14.5 |
| Carson City | — |
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Frequently Asked Questions
Which county in Nevada has the best water quality?
Elko County has the highest water quality score in Nevada at 86.0/100 (Grade: A), based on EPA SDWIS data.
Which county in Nevada has the most water violations?
Nye County has among the lowest water quality scores in Nevada at 14.5/100. See the individual county page for detailed violation history.
Is the tap water safe to drink in Nevada?
Nevada has an average water quality score of 48.5/100 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 Nevada 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.