Nevada Tap Water Quality
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Overview
Nine in ten Nevadans drink Colorado River water from Lake Mead, treated by the Southern Nevada Water Authority for the Las Vegas Valley, or Truckee River water treated by TMWA in Reno. Both operations are heavily monitored and fully compliant, with SNWA's drought engineering (including the 'third straw' intake) nationally known.
The water is very hard and mineral-rich, the state's top consumer complaint but not a safety issue. Outside the metros, some rural basins carry naturally occurring arsenic (the Fallon area is well documented) and uranium, and small systems treat or blend accordingly.
Common Contaminants in Nevada
Lake Mead water runs 250-300 mg/L hardness: softeners are common, safety is unaffected
Naturally elevated in several rural basins (Fallon, Fernley historically); affected systems installed treatment after the 2006 arsenic rule
The Henderson industrial site once fed perchlorate into Lake Mead; remediation cut levels dramatically and current water meets all standards
Violations & Compliance
The metro systems are consistently compliant. Rural arsenic drove a wave of small-system treatment installs; monitoring violations in tiny systems remain the most common enforcement item.
Water Hardness in Nevada
Very hard, typically 250–300 mg/L. Lake Mead's Colorado River water puts Las Vegas among the hardest big-city supplies in America; Reno's Truckee River water is notably softer.
Hardness affects taste, limescale, and soap — not safety. Compare levels across all cities or read the water hardness guide.
City Water Reports in Nevada
Frequently Asked Questions
Sources & References
The safety rating and guidance on this page draw on the following sources. See our full methodology.
- •US EPA Safe Drinking Water Act regulations
- •EWG Tap Water Database
- •The utility's most recent Consumer Confidence Report (CCR)
- •WHO Guidelines for Drinking-water Quality