Herriman Water Hardness & Quality Report (2026)

Herriman City Water Department serves approximately 50,000 residents in Herriman, Utah, within Salt Lake County, southwest of Salt Lake City. The utility blends local groundwater from city-owned wells — including the Stillman Well — with purchased surface water from the Jordan Valley Water Conservancy District (JVWCD). JVWCD supplies treated water primarily from the Provo River, Deer Creek Reservoir, and Jordan River diversions. Treatment occurs at JVWCD facilities including filtration and disinfection plants, with Herriman adding local processing such as chloramination.

The supply originates in the Jordan River watershed, encompassing the Provo River drainage from the Wasatch Front and high-elevation snowmelt in the Uinta-Wasatch-Cache National Forest. Local groundwater accesses the shallow unconsolidated Jordan Valley aquifer, while the region's geology features thick limestone and dolomite from Paleozoic formations — including the Deseret Limestone — and Mesozoic periods, with Quaternary valley-fill sediments amplifying mineral dissolution. JVWCD source waters also drain the Wasatch Range's Pennsylvanian Oquirrh Group limestone terrain. This pervasive carbonate geology imparts a very hard character through high mineral leaching from both groundwater and surface allocations.

Very hard water promotes heavy limescale buildup in pipes, water heaters, dishwashers, and washing machines — water heaters may fail two to three times faster without mitigation. Faucet aerators and showerheads clog quickly. Maintenance includes monthly vinegar descaling for fixtures, annual heater flushes, and magnetic descalers as supplemental aids. A whole-house water softener is strongly recommended; pair with iron filters if staining occurs. Herriman's 2021 Consumer Confidence Report confirms EPA compliance with no lead or copper violations. pH typically 7.5–8.2; routine tests show low levels of arsenic, nitrate, and disinfection byproducts within limits. The supply is safe, with naturally beneficial calcium and magnesium present.