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Water Quality: Why does the Las Vegas Valley have hard water?
Our water meets and/or exceeds every Federal and State water quality standard. The “hardness,” although not harmful, is due to the fact our water comes from the snow packed mountains of Colorado. As it works its way down the Colorado River and into Lake Mead it picks up a lot of naturally occurring minerals along the way. It is important to note that the U.S. Environmental Protection Agency (EPA) has not set a legal limit or standard for hardness in water. This is primarily because the constituents that contribute to hardness (generally calcium and magnesium ions) are not toxic; that is, they do not cause harmful health effects.
The Nevada Secondary Standard for hardness is 500 mg/L. The hardness of the City's water is 288 mg/L.
You can find further information in the Water Quality Report located on the City’s website.