Northglenn Water Hardness & Quality Report (2026)

Northglenn, Colorado, in Adams County north of Denver — a major north Denver suburban community, a planned community developed primarily in the 1960s–1970s as part of the Denver north suburban expansion, adjacent to Thornton and Westminster in the rapidly growing Adams County north Denver corridor, and a diverse Adams County community with a significant Latino-American population — draws its municipal water supply via the Northglenn Utilities receiving water from Denver Water and the Colorado–Big Thompson Project. Water hardness in Northglenn measures 150.5 mg/L — classified as hard.

Northglenn's moderate-to-hard supply reflects the Denver metro area's blended supply characteristics. The South Platte River watershed (Denver Water source) carries water from: the Colorado Rocky Mountains (Precambrian calcareous-poor Pike's Peak Granite and Boulder Batholith); the Colorado Plateau calcareous sediment blended with Colorado–Big Thompson Project transmountain diversions. The Denver Basin receiving waters accumulate moderate hardness from the Rocky Mountain carbonate and semi-arid Great Plains geology. Northglenn's north Denver distribution zone produces the moderate 150.5 mg/L.

At 150.5 mg/L, Northglenn residents face moderate-to-hard scale challenges. Monthly cleaning with citric acid solution is recommended. Northglenn Utilities consistently delivers water meeting all Colorado CDPHE and EPA Safe Drinking Water Act requirements.