Evanston Water Hardness & Quality Report (2026)

Evanston, Wyoming, in Uinta County — a Uinta County city adjacent to Bear River City on the Bear River in southwest Wyoming near the Utah border — receives its water from the City of Evanston Water Department, drawing from Bear River impoundments in the Uinta County watershed through the southwest Wyoming distribution.

The hard 151 mg/L hardness and TDS of 345.2 mg/L reflect the Uinta County Bear River supply's hard character — the Cretaceous Frontier Formation (calcareous sandstone and shale) and Jurassic Morrison Formation contribute dissolved minerals as the river drains the Wyoming-Uinta Mountain flanks (compare Rock Springs WY: 155/360 in Sweetwater County comparable; Laramie WY: 130/295 in Albany County softer; Evanston moderate-hard from the Uinta County Bear River Cretaceous-Jurassic draw). The Bear River at Uinta County — Cretaceous Frontier Formation (calcareous — primary hardness contributor), Jurassic Morrison Formation (slightly calcareous — secondary contributor), and Quaternary Bear River alluvium (calcareous — TDS contributor).

At 151 mg/L with TDS 345, Evanston's water is hard — scale builds in kettles and appliances over months, water heaters benefit from annual flushing. Quarterly descaling is appropriate. The PFAS level of 2.2 ppt is very low — no urgent filtration required, warrants routine monitoring only. Evanston's clean PFAS reading reflects its rural southwest Wyoming location away from major industrial or military sources.