Sahuarita Water Hardness & Quality Report (2026)

Sahuarita, Arizona, in Pima County south of Tucson, receives its municipal water from the Sahuarita Water Company and local municipal utilities drawing from a blended supply of Central Arizona Project (CAP) canal water and groundwater wells tapping the Tucson Basin Alluvial Aquifer. The CAP canal imports water from the Colorado River at Lake Havasu, transporting it 336 miles through the Sonoran Desert to the Tucson metropolitan area. This imported surface water is blended with locally pumped groundwater at treatment facilities before distribution to Sahuarita's growing residential communities.

The moderately hard 180 mg/L hardness results from the mineral character of both supply sources. Colorado River water accumulates dissolved calcium and magnesium as it flows through hundreds of miles of Permian and Triassic carbonate and evaporite formations across the desert Southwest. Local groundwater from the Tucson Basin alluvial aquifer contacts Quaternary alluvial sediments with calcareous horizons and reworked Paleozoic carbonate fragments from surrounding mountain ranges, adding further calcium bicarbonate to the blended supply.

At 180 mg/L, Sahuarita's water is in the hard range — typical for southern Arizona communities relying on Colorado River imports. Residents deal with persistent white scale on faucets, showerheads, and glass shower doors, and mineral deposits form rapidly on kettle heating elements in the dry desert heat. Monthly descaling of small appliances keeps them performing efficiently. Many Sahuarita homeowners install a whole-house water softener to protect plumbing and appliances — a sound investment given the hardness level and the region's historically high demand on water infrastructure.