Broomfield Water Hardness & Quality Report (2026)

The City of Broomfield Utilities Department provides drinking water to residents in Broomfield, Colorado, located in Broomfield County between Denver and Boulder. Water sources include treated supplies purchased from Denver Water and raw water from the Northern Colorado Water Conservancy District's Colorado-Big Thompson (C-BT) Project and Windy Gap system. C-BT water is stored in Carter Lake near Berthoud, transported via a 33-mile pipeline to Broomfield's Water Treatment Plant, and held in the Matthew D. Glasser Reservoir before distribution to residents.

The supply draws from watersheds in the Front Range of the Colorado Rockies, encompassing the Upper Colorado River headwaters for the C-BT system and rivers in the South Platte Basin for Denver Water, including the Blue, Williams Fork, Fraser, South Boulder, Ralston, and Bear Creeks. Underlying geology features Precambrian igneous and metamorphic rocks at high elevations, overlain by Paleozoic limestones, dolomites, and shales, plus Cretaceous sandstones. This limestone-influenced terrain imparts a moderately mineralised character to the snowmelt-dominated surface water through natural carbonate dissolution and rock weathering.

As moderately hard water, Broomfield's supply promotes moderate scale buildup in water heaters, dishwashers, washing machines, and faucets, leading to reduced efficiency, spots on glassware, and soap scum. Regular maintenance — deliming heaters annually, installing scale-inhibiting filters, and using vinegar soaks for showerheads — helps manage deposits. A water softener is often recommended for households with hard water concerns. Broomfield's 2022 Water Quality Report confirms compliance with all EPA and Colorado standards; pH is maintained between 8.5 and 9.1 in the distribution system for corrosion control, and bromodichloromethane was detected above health guidelines in some samples.