Prescott Valley Water Hardness & Quality Report (2026)

Prescott Valley, Arizona, in Yavapai County — the largest community in the Quad-City Prescott area (adjacent to Prescott, Chino Valley, and Dewey), one of the fastest-growing communities in Arizona, a major outdoor recreation, retirement, and mountain community in the central Arizona Bradshaw Mountain region, and a rapidly growing exurban Phoenix metro north suburb in the Prescott metropolitan statistical area — draws its municipal water supply from the Big Chino and Little Chino Sub-basins via the Town of Prescott Valley Water Division. Water hardness in Prescott Valley measures 167 mg/L — classified as hard.

Prescott Valley's hard supply reflects the Yavapai County Prescott Valley basin-fill calcareous geology. The Big Chino and Little Chino Sub-basins — the Verde River headwater basins — are hosted in: the Quaternary–Tertiary calcareous basin-fill alluvium (eroded from the central Arizona Highlands calcareous Precambrian and Paleozoic carbonate terrain); the Precambrian calcareous limestone and dolomite of the Yavapai Province (the Central Arizona Highlands Proterozoic calcareous marble and calcareous gneiss — the basement calcareous formations of central Arizona); and Tertiary calcareous volcanic tuffs of the Prescott region. The basin-fill calcareous alluvium dissolution produces the hard 167 mg/L.

At 167 mg/L, Prescott Valley residents face regular hard water challenges. Monthly descaling with citric acid solution is standard maintenance. Town of Prescott Valley Water Division consistently delivers water meeting all Arizona ADEQ and EPA Safe Drinking Water Act requirements.