Midwest Lagoon Wastewater Treatment Plant, Midwest, Wyoming

Midwest Lagoon is a municipal wastewater treatment facility located in Midwest, Natrona County, Wyoming. The plant serves a small population of 404 residents, reflecting the rural character of the region. It operates as a lagoon-based secondary treatment system, a common approach for small communities in the western United States. The plant has a designed capacity of 94.64 megaliters per year and currently treats approximately 75.71 megaliters annually, indicating operational capacity below design levels. As a secondary treatment facility, it meets the minimum federal standards under the US Clean Water Act, which requires secondary treatment for municipal wastewater discharges. The plant is subject to National Pollutant Discharge Elimination System (NPDES) permitting, administered by the Wyoming Department of Environmental Quality. The treated effluent from Midwest Lagoon discharges into local surface waters that ultimately drain into the North Platte River basin. The North Platte River flows through Wyoming and Nebraska, supporting agricultural irrigation, wildlife habitat, and recreational uses. The plant's location in a semi-arid region makes water quality protection particularly important for downstream ecosystems and water users.

Midwest Lagoon discharges into tributaries of the North Platte River, which flows eastward through Wyoming and Nebraska before joining the Platte River. The North Platte River basin supports diverse aquatic life, including native fish species and migratory birds along the Central Flyway. The semi-arid climate of central Wyoming means that stream flows are highly dependent on seasonal snowmelt, making the receiving waters sensitive to nutrient loading and other pollutants from wastewater discharges.