OSKALOOSA SW STP - Oskaloosa, Iowa Wastewater Treatment Plant

OSKALOOSA SW STP is a municipal wastewater treatment facility located in Oskaloosa, Mahaska County, Iowa. The plant serves a population of about 4,784 residents, classifying it as a small to medium-sized treatment facility under U.S. Environmental Protection Agency (EPA) guidelines. As a U.S. facility, the plant operates under the Clean Water Act and is subject to National Pollutant Discharge Elimination System (NPDES) permitting. For plants of this scale, secondary treatment is typically required to meet effluent limitations for biochemical oxygen demand and total suspended solids. Regulatory standards ensure adequate treatment for the community served. The plant discharges treated wastewater into local streams that flow into the Des Moines River, a tributary of the Mississippi River. The Mississippi River basin supports diverse aquatic life and provides drinking water for millions. The plant's operations contribute to protecting water quality in this important watershed.

The plant discharges into tributaries of the Des Moines River, which flows southeast to join the Mississippi River. The Mississippi River basin is a major ecological corridor supporting fish, migratory birds, and diverse aquatic habitats. Downstream waters eventually reach the Gulf of Mexico, where nutrient loading from upstream sources can contribute to hypoxic zones. Effective treatment at this plant helps reduce nutrient and pollutant loads to the river system.