Saint George Water Hardness & Quality Report (2026)

The St. George City Water Department serves approximately 100,000 residents across Washington County, Utah, including St. George (ZIPs 84770 and 84790) and surrounding areas such as Washington City. Primary sources are groundwater wells tapping the Navajo Sandstone Aquifer and Virgin River Valley aquifers; the utility manages over 50 wells across 150+ square miles. Key facilities include the Gunlock Treatment Plant, Bloomington Wells, and the Leeds Wells Complex. During peak demand, surface water from the Virgin River supplements supply via diversion weirs.

The supply originates in the Virgin River Watershed within the Colorado Plateau physiographic province. Groundwater flows through the vast Navajo Sandstone Aquifer (Jurassic), a massive eolian sandstone overlying Permian Kaibab Limestone and Coconino Sandstone — formations rich in calcite and dolomite. Karst dissolution and evaporite contacts release calcium, magnesium, and sulfate ions into the water. The region's tectonic uplift limits recharge from infrequent precipitation, allowing long rock-water residence times that concentrate minerals, resulting in a characteristically very hard supply.

Very hard water in St. George promotes heavy scale buildup in pipes, water heaters, dishwashers, tankless systems, washing machines, and showerheads, reducing efficiency by 10–30% and shortening appliance life. Faucets and fixtures accumulate mineral deposits rapidly, raising energy bills and maintenance costs. Whole-house water softeners with 1–1.5 gpg regeneration are strongly recommended; regular vinegar descaling and magnetic or electronic descalers can supplement treatment. Water is slightly alkaline (pH 7.5–8.2), meets EPA lead/copper rules, has no detectable PFAS, and is treated with chlorination, fluoridation at 0.7 mg/L, and corrosion control. Elevated sulfate (100–300 mg/L) is notable; annual CCR confirms compliance with all primary standards, with secondary standards exceeded for hardness and TDS only.