Water quality · Nevada
Water quality in Nevada
Of the 4 Nevada ZIPs matched to an EPA SDWIS community water system, none reports a health-based violation in the last 3 years. SDWIS reports the system serving the county, never an address-level test, and never private wells.
Last verified 2026-09-24 · methodology
Water quality by ZIP code in Nevada
The largest community water system EPA lists for each ZIP's county, and its health-based violations in the last 3 years.
| ZIP | Largest system | Health-based violations |
|---|---|---|
| 89101Las VegasClark County | LAS VEGAS VALLEY WATER DISTRICT | None |
| 89501RenoWashoe County | TRUCKEE MEADOWS WATER AUTHORITY | None |
| 89701Carson CityCarson City | CARSON CITY PUBLIC WORKS | None |
| 89509Reno (Southwest)Washoe County | TRUCKEE MEADOWS WATER AUTHORITY | None |
County-level figures from EPA SDWIS, joined to each ZIP by county. None of them is a measurement at a specific address.
What lands here
Pages show the largest community water system on record for the ZIP's county, its PWSID and population served, and its health-based and total violations in the last 3 years. Lead and copper sampling results are not shown; your utility's annual water quality report (CCR) has them.
Source & refresh
EPA SDWIS. Refreshed quarterly (federal mandate). Primary source →
Nevada top concern
Wildfire, water-supply (Colorado River allotment)
Nevada's wildfire risk concentrates in the western Sierra foothills (Reno, Carson City, Lake Tahoe). Las Vegas water supply tied to declining Lake Mead Colorado River allotment. EPA SDWIS shows arsenic challenges in some rural systems.
See Nevada state page for the full state-level rollup across all 12 dimensions.
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