Penermon Lagoon Wastewater Treatment Plant, Penermon, Missouri

Penermon Lagoon is a municipal wastewater treatment facility located on County Road 718 in Penermon, Stoddard County, Missouri. The plant serves a small population of 64 people, reflecting its role in a rural community. As a lagoon-based system, it provides secondary treatment, which is typical for small agglomerations in the United States. The facility has a designed capacity of 105.99 million gallons per year and currently discharges approximately 30.28 million gallons annually. Under the US Clean Water Act, such plants are regulated through National Pollutant Discharge Elimination System (NPDES) permits issued by the Missouri Department of Natural Resources. These permits set effluent limits to protect water quality in receiving streams. The plant's treated effluent ultimately drains into the Mississippi River watershed, contributing to the broader hydrological network of the central United States. The facility's operation supports local sanitation and environmental health in the rural Mississippi Delta region.

Penermon Lagoon discharges into local waterways that flow into the Mississippi River basin, a major drainage system supporting diverse aquatic life and migratory birds. The region's flat terrain and agricultural land use mean that nutrient management is important to prevent downstream impacts on the Gulf of Mexico, where excess nutrients contribute to seasonal hypoxic zones. The plant's secondary treatment helps reduce organic pollutants and suspended solids before discharge.