Granger Lagoon Wastewater Treatment Plant, Sweetwater County, Wyoming

Granger Lagoon is a wastewater treatment facility located in Sweetwater County, Wyoming, United States. It serves a small population of 139 residents, reflecting its role as a local-scale treatment system in a rural area of the state. The plant provides secondary treatment, a standard level required by the U.S. Clean Water Act for municipal wastewater. With a designed capacity of 378.54 cubic meters per day and an average daily discharge of 75.71 cubic meters, the facility operates well within its capacity. As a U.S. plant, it operates under an EPA NPDES permit issued by the Wyoming Department of Environmental Quality, which sets effluent limits to protect water quality. The treated effluent is discharged into a local water body, likely a stream or river within the Green River Basin, which ultimately drains into the Colorado River system. This watershed supports diverse aquatic life and is an important water resource for the arid Western U.S. The plant's secondary treatment helps reduce nutrient and organic pollutant loads, protecting downstream ecosystems.

The plant discharges into a local watercourse within the Green River Basin, part of the larger Colorado River watershed. This arid region relies on limited surface water for agriculture, recreation, and wildlife. The treated effluent contributes to base flow, supporting aquatic habitats and migratory bird corridors in the high desert environment.