Scottsdale Water Hardness & Quality Report (2026)

The City of Scottsdale Water Division supplies over 258,000 residents in Scottsdale, Arizona, within Maricopa County. Water sources include surface water from the Colorado River via the Central Arizona Project aqueduct, Salt River Project canal deliveries, and groundwater from the Salt River Valley aquifer. Treatment occurs at four plants: the 56th Street Water Campus for surface water, Indian Bend for groundwater, 24th Street for groundwater blending, and Chaparral for groundwater. The utility manages a service area spanning 184 square miles in the Phoenix metro region.

Water originates from the expansive Colorado River Basin watershed and Salt-Verde River system, flowing through arid Southwest canyons and basins. Groundwater taps the Salt River Valley aquifer within basin-fill sediments overlying older bedrock. The geology features limestone, caliche, and evaporite deposits from Paleozoic and Mesozoic marine environments that leach minerals into the supply as water percolates through fractured rock and alluvial soils, creating a characteristically hard supply with elevated dissolved solids from the desert's mineral-rich subsurface.

Very hard water leads to rapid scale buildup in pipes, water heaters, dishwashers, washing machines, and showerheads, reducing efficiency and shortening lifespan. Soap scum forms on fixtures, skin feels dry and itchy, and hair dulls. Monthly vinegar descaling of aerators, annual heater flushes, and low-flow fixture replacements are recommended; a whole-home water softener is strongly advised to prevent significant annual appliance damage. Water pH typically 7.5–8.5; lead and copper rule compliant via corrosion control; arsenic, chromium-6, and uranium have exceeded health guidelines in some tests; treatment includes conventional filtration, chloramination, fluoridation, and blending.