Roxborough Water Hardness & Quality Report (2026)

The Roxborough Water and Sanitation District (RWSD) provides drinking water to customers in Jefferson County, Colorado. Their supply primarily comes from surface diversions in the nearby foothills, treated at local facilities to meet federal and state standards. RWSD manages the distribution for this semi-rural community located northwest of Denver. The water originates in the upper Ralston Creek and North Turkey Creek watersheds within the Front Range. Precipitation here infiltrates Paleozoic bedrock, which is dominated by sandstone and limestone sequences from the Pennsylvanian Fountain Formation and underlying Mississippian strata. These formations impart a moderately mineralized profile due to natural leaching of alkaline earth metals from sedimentary layers. The geology fosters a stable but mineral-laden chemistry, shaped by the erosion of ancient mountain belts into foothill aquifers and streams.

At moderately hard levels, homeowners may notice soap scum in showers, scale buildup in dishwashers and water heaters, and reduced lather from detergents. Appliances like coffee makers and washing machines can be affected, with mineral deposits potentially shortening their lifespan if left unaddressed. Regular vinegar rinses, magnetic descalers, or cartridge filters can help mitigate these effects; a whole-home softener is an optional but recommended addition for heavy users seeking to preserve appliance efficiency without over-softening the water. RWSD maintains a neutral pH for corrosion control, and recent testing shows lead and copper levels well below action limits. No significant PFAS detections were reported in recent monitoring; the primary concerns are occasional turbidity from runoff, which is managed through coagulation, sedimentation, filtration, and chlorination. The treatment process ensures safe, clear water year-round, with annual Consumer Confidence Reports detailing all parameters.