Evans Water Hardness & Quality Report (2026)

Evans, Colorado, in Weld County — a northern Front Range city adjacent to Greeley on the South Platte River, one of the fastest-growing communities in Colorado's northeastern urban corridor, a key agricultural-industrial gateway city at the South Platte-Poudre River confluence zone — receives its municipal water from the Central Weld County Water District or the City of Greeley Water utility, which draws from the South Platte River and the Colorado-Big Thompson (CBT) Project supply through Horsetooth Reservoir in Fort Collins or the CBT distribution system. Weld County's water supply integrates Front Range mountain snowmelt and local South Platte River flow.

The moderately hard 119 mg/L hardness and TDS of 261.6 mg/L reflect the South Platte-Front Range supply's moderate carbonate geological contribution. The South Platte River drains the Front Range — Precambrian gneiss and granite (the Pikes Peak Granite and Idaho Springs Formation — soft crystalline terrain) — but also traverses the Colorado Piedmont, which is underlain by the Cretaceous Pierre Shale and Niobrara Chalk (calcareous marine shale and limestone). Agricultural return flows from the Weld County corn and sugar beet farming corridor also add moderate dissolved minerals to the lower South Platte. The CBT supply adds western-slope Rocky Mountain water that picks up carbonate contributions during its transit through Front Range formations.

At 119 mg/L, Evans' water is moderately hard — comfortable for Front Range household use. Scale builds in kettles and appliances over months, the dishwasher benefits from rinse aid, and faucet aerators need periodic cleaning. Quarterly descaling of heating appliances is appropriate. The PFAS level of 4.2 ppt is modest for the Weld County Front Range — Evans' agricultural and light industrial character, the South Platte corridor's limited direct military PFAS sources, and the CBT supply's managed watershed produce a moderate PFAS background.