Columbine Water Hardness & Quality Report (2026)

Columbine, Colorado, in Jefferson County southwest of Denver in the South Jefferson County foothills corridor — sharing its name with the tragic 1999 high school shooting — receives its municipal water from Denver Water, the regional water authority serving the Denver metropolitan area. Denver Water draws from an extensive South Platte River reservoir system including Antero Reservoir, Eleven Mile Reservoir, Cheesman Reservoir, and Chatfield Reservoir, plus trans-mountain diversion tunnels bringing Blue River water from the western slope. This comprehensive mountain water system delivers consistently high-quality supply throughout the Denver metro area.

The moderate 151 mg/L hardness and TDS of 383 mg/L reflect Denver Water's South Platte mountain watershed character. The upper South Platte reservoirs drain the Colorado Front Range — an ancient terrain of Precambrian Pikes Peak Granite, Proterozoic gneiss and schist, and Paleozoic marine limestone (Manitou Limestone, Ordovician Harding Sandstone contacts) in the foothills transition zone. Pure crystalline granite and metamorphic terrain produces very soft water, but the Paleozoic marine carbonate remnants in the foothills and the glacial and alluvial sediment contacts in the mountain valley systems add moderate hardness to the finished supply. Denver Water's treatment moderates hardness through the delivery system.

At 151 mg/L, Columbine's water is moderately hard — a typical and manageable Denver metropolitan supply profile. Scale accumulates in kettles and coffee machines over two to three months, the dishwasher benefits from rinse aid to minimize glassware spotting, and faucet aerators need periodic cleaning. Quarterly descaling of heating appliances is the practical cadence for Jefferson County households. The low PFAS level of 5.2 ppt reflects Denver Water's pristine mountain watershed origins — a favorable result for this Jefferson County community.