Commerce City Water Hardness & Quality Report (2026)

Commerce City, Colorado is supplied by the South Adams County Water and Sanitation District, which operates eleven shallow wells drawing from the alluvial aquifer connected to the South Platte River, three deep wells tapping the Arapahoe Formation, and receives treated surface water from Denver Water. The Klein Water Treatment Facility processes groundwater before blending with Denver Water's surface supply. The service area encompasses south Adams County and surrounding municipalities, with full compliance details available through the District's Consumer Confidence Report.

The South Platte River watershed spans diverse Cretaceous and Tertiary formations across the Colorado Front Range and plains. The alluvial aquifer and Arapahoe Formation — both of Cretaceous age — contain significant concentrations of calcium and magnesium-bearing minerals, particularly gypsum and limestone, that dissolve into groundwater as it percolates through these formations. Denver Water's surface supply originates from the Continental Divide watershed, including the South Platte River, Dillon Reservoir tributaries, and Fraser River drainage. The combination of deep Cretaceous aquifer water and surface runoff creates a very hard blended supply.

At very hard levels, residents should expect significant scale buildup in pipes, water heaters, dishwashers, and washing machines, rapidly reducing efficiency and shortening appliance lifespan. Water heaters require more frequent flushing and maintenance, and laundry and dishwasher performance noticeably diminishes. A water softener is strongly recommended to prevent costly repairs and extend appliance life, particularly for the hot water system. The District has detected 1,4-Dioxane above health guidelines in the supply and maintains compliance with EPA Safe Drinking Water Act standards through treatment at the Klein Water Treatment Facility. Residents should consult the District's most recent Consumer Confidence Report for complete contaminant data and lead and copper testing results.