Sun City Water Hardness & Quality Report (2026)

Sun City, Arizona, in Maricopa County northwest of Phoenix — the original master-planned active adult retirement community in the United States (Sun City was developed by Del Webb in 1960 — the first large-scale purpose-built retirement community in the US, launching the concept of the age-restricted active adult retirement community), a major Arizona retirement destination known for its golf courses, recreation centers, and age-55+ community, and a significant historical and demographic landmark in American urban development — draws its municipal water supply from the Salt River Valley Alluvial Basin and CAP via the EPCOR Water Arizona. Water hardness in Sun City measures 314 mg/L — classified as very hard.

Sun City's very hard supply reflects the northwest Maricopa County desert alluvial geology and Colorado River CAP supply. The Salt River Valley Alluvial Basin at Sun City draws from: the Quaternary desert alluvial fan deposits from the White Tank Mountains (calcareous caliche-cemented desert alluvial fans — extreme evaporative concentration); the CAP Colorado River import (the Colorado River at approximately 280–310 mg/L). EPCOR applies limited softening, producing the very hard 314 mg/L.

At 314 mg/L, Sun City residents face severe hard water challenges. Water softeners are essentially a standard fixture. EPCOR Water Arizona consistently delivers water meeting all Arizona ADEQ and EPA Safe Drinking Water Act requirements.