Cottonwood Heights Water Hardness & Quality Report (2026)

Salt Lake City Public Utilities supplies water to Cottonwood Heights along with Holladay and other communities in Salt Lake County. Primary sources are high-quality mountain streams in the Wasatch Range, including City Creek, Parleys Creek, and Big Cottonwood Creek, treated at water treatment plants (WTPs). Supplemental groundwater comes from local wells and springs; a service area map is available at www.slc.gov/utilities.

The watershed spans the Wasatch Front, with streams draining from the Wasatch Range canyons into the Salt Lake Valley. The geology includes Pennsylvanian limestone and dolomite formations in the mountains — notably the Deseret Limestone and Humbug Formation — which impart a hard character to surface water through mineral dissolution. Groundwater is sourced from valley-fill aquifers in unconsolidated Quaternary sediments overlying older bedrock, picking up additional dissolved solids. The combination of limestone-rich mountain runoff and mineralized groundwater, amplified by the arid climate, results in a very hard supply prone to scale formation.

Very hard water in Cottonwood Heights leads to significant scale buildup in pipes, reducing water pressure and shortening appliance lifespans, especially water heaters, dishwashers, and washing machines. Faucets and showerheads develop white, chalky deposits, while dishes appear spotty and skin may feel dry. Routine maintenance including descaling fixtures, flushing water heaters, and installing a whole-home water softener is strongly recommended to protect plumbing. Salt Lake City's 2025 Consumer Confidence Report confirms compliance with all drinking water standards including lead and copper; treatment involves filtration and disinfection of surface water at WTPs. Residents can contact Salt Lake City Public Utilities at 801-483-6867 for details.