Tucson, AZ
Tucson Water's main system is classed "hard to very hard"; its 2024 Annual Water Quality Report puts hardness around 228 mg/L (about 13.3 grains per gallon).
10 verified pros
Phoenix, AZ
Phoenix's 2025 Water Quality Report gives total hardness of 172 to 302 ppm, or 10 to 17.6 grains per gallon.
3 verified pros
Las Vegas, NV
The Las Vegas Valley Water District tells customers to set softeners for 280 ppm, or 16 grains per gallon.
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San Antonio, TX
SAWS says the water it supplies typically runs 15 to 20 grains per gallon.
4 verified pros
El Paso, TX
El Paso Water's chemical analysis puts average hardness at about 175 mg/L (about 10.2 grains per gallon). The utility calls it moderately hard to hard.
3 verified pros
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