Riverton Water Hardness & Quality Report (2026)

Riverton, Wyoming, in Fremont County — the Fremont County seat adjacent to Lander and Dubois on the Wind River in west-central Wyoming — receives its water from the City of Riverton Water Department, drawing from the Wind River through the west-central Wyoming distribution.

The moderately hard 89 mg/L hardness and TDS of 160.3 mg/L reflect the Fremont County Wind River supply's moderate character — the Precambrian Wind River Granite is largely insoluble crystalline basement, while the Eocene Wind River Formation contributes moderate calcareous mineral content from its calcareous lake and fluvial sediments in the Wind River Basin (compare Lander WY: 86/154 in Fremont County comparable; Dubois WY: 91/166 in Fremont County comparable; Riverton consistent moderate from the same Fremont County Wind River Precambrian granite supply). The Wind River watershed — Precambrian Wind River Granite (insoluble — primary dilutant), Eocene Wind River Formation (slightly calcareous — primary hardness contributor), and Quaternary Wind River alluvium (slightly calcareous — minor TDS).

At 89 mg/L with TDS 160, Riverton's water is moderately hard — mild scale buildup. Semi-annual descaling is appropriate. The PFAS level of 1.5 ppt is very low — an excellent result for Wyoming. Review the City of Riverton's annual water quality report.