Windsor Water Hardness & Quality Report (2026)

Windsor, Colorado, in Weld and Larimer Counties — a major north Colorado Front Range rapidly growing community (Windsor is one of Colorado's fastest-growing communities — a primarily residential community on the Weld–Larimer County line between Fort Collins and Greeley, which has grown dramatically since the 2000s as a bedroom community for both the Fort Collins tech and CSU community and the north Colorado oil and gas industry workers), a diverse Weld County community with a significant agricultural professional, oil and gas industry, and young family population, home of Windsor Lake (a significant recreation lake in the Windsor community), and a community increasingly shaped by Colorado's north Front Range suburban expansion — draws its municipal water supply from the Cache la Poudre River (Horsetooth Reservoir) via the Northern Colorado Water Conservancy District. Water hardness in Windsor measures 67.5 mg/L — classified as moderately soft.

Windsor's moderate softness reflects the Cache la Poudre River watershed's calcareous-poor Rocky Mountain geology. The Cache la Poudre River (Rocky Mountain National Park headwaters — draining Precambrian Front Range granite and gneiss, calcareous-poor) supplies Horsetooth Reservoir (Northern Colorado Water Conservancy District). Treatment produces the moderate 67.5 mg/L.

With hardness at 67.5 mg/L, Windsor residents enjoy moderately soft water. Town of Windsor Water Division consistently delivers water meeting all Colorado CDPHE and EPA Safe Drinking Water Act requirements.