Henderson Water Hardness & Quality Report (2026)

The City of Henderson Water Utility serves over 320,000 residents across neighborhoods including Green Valley, Anthem, and Seven Hills in Clark County, Nevada. The primary source is surface water from Lake Mead, fed by the Colorado River, accounting for approximately 90% of supply, with 10% from Las Vegas Valley groundwater wells. The City of Henderson Water Treatment Plant processes 15% of the drinking water (up to 15 million gallons per day), while 85% is supplied by the Southern Nevada Water Authority from facilities including the Alfred Merritt Smith and River Mountains Water Treatment Facilities.

The Colorado River watershed spans from the Rocky Mountains through arid basins, traversing Paleozoic and Mesozoic limestone formations, gypsum beds, and ancient marine sedimentary deposits that concentrate minerals as water flows downstream to Lake Mead. Groundwater from the deep Las Vegas Valley aquifer, embedded in basin-fill alluvial sediments and volcanic rocks, adds further calcium and magnesium mineralization. This geology creates a supply rich in dissolved minerals, yielding a distinctly hard profile without significant softening from glacial or granitic sources.

Very hard water places significant strain on household systems, causing scale damage to water heaters, dishwashers, washing machines, and plumbing fixtures, reducing efficiency and lifespan. Maintenance tips include regular flushing of water heaters, installing drain screens, and vinegar soaks for faucets. A water softener is highly recommended to prevent scaling and extend appliance life. Notable contaminants include arsenic (average 2 ppb), chromium-6 (average 57 ppt), disinfection byproducts, heavy metals, and radioactive elements, with some exceeding health advocacy guidelines, though EPA regulatory limits are met. Treatment involves conventional coagulation, filtration, and disinfection at SNWA and city facilities.