Las Vegas hard water: how hard is it?
Las Vegas tap water is very hard: about 16 grains per gallon (280 ppm) on average. That number comes from the Las Vegas Valley Water District's 2026 water quality summary (PDF, opens in new tab).
Las Vegas water hardness
Grains per gallon, from the Las Vegas Valley Water District 2026 summary. Sacramento river water shown for comparison.
Why is Las Vegas water so hard?
Most of the valley's water comes from Lake Mead, on the Colorado River. On its long trip through the desert Southwest, the river picks up calcium and magnesium from the rock and soil. Those minerals are what "hardness" means. They are still in the water when it reaches your tap.
Live in Henderson or North Las Vegas? Those cities run their own water systems, so check their reports for your exact number.
What 16 grains per gallon means at home
- White crust on faucets, shower heads and glass shower doors
- Cloudy spots on dishes, even after the dishwasher
- Scale building up inside your water heater, which makes it work harder
- Soap and shampoo that do not lather well
Tip: set your dishwasher's hardness setting to match. At 16 gpg, most dishwashers want their highest setting and rinse aid.
Do you need a water softener in Las Vegas?
At 16 grains per gallon, most homes notice a real difference with a softener. It is one of the hardest-water cities in the country. A softener removes the calcium and magnesium for the whole house. A reverse osmosis system at the kitchen sink is a separate choice, for drinking water.
Before you buy, get your own tap tested. The average is 16 gpg, but the number at your house is the one that sizes the system. Wondering about price? See what a water softener costs.
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Book my free water testCommon questions
Is Las Vegas water hard?
Yes. The Las Vegas Valley Water District reports an average total hardness of 280 ppm, or 16 grains per gallon. Anything over 10.5 grains per gallon is considered very hard.
How many grains per gallon is Las Vegas water?
About 16 grains per gallon on average, per the district's 2026 water quality summary. Your exact number can differ a little by neighborhood.
Is Las Vegas tap water safe to drink?
Hardness is not a safety issue. It is calcium and magnesium, which cause scale and spots. For safety results, read the district's full water quality report.
Keep reading
DataWater hardness by cityHow hard the tap water is in US cities, from each utility report.
City dataPhoenix water hardness: what the city report says10 to 17.6 grains per gallon. Hard to very hard.
GuideHow much does a water softener cost installed?Installed price ranges, running costs, and what drives the price.
GuideDo I need a water softener with city water?It depends on your city. Here is how to decide.