MANSON WWTP - Calhoun County, Iowa Wastewater Treatment Plant

MANSON WWTP is a municipal wastewater treatment facility located in Lincoln Township, Calhoun County, Iowa. It serves a population of approximately 1,844 residents, reflecting a small community scale typical of rural Iowa. As a US-based plant, MANSON WWTP operates under the Clean Water Act and is regulated through the National Pollutant Discharge Elimination System (NPDES) permit program, administered by the Iowa Department of Natural Resources. For small agglomerations like this, secondary treatment is the standard requirement, ensuring removal of organic matter and suspended solids before discharge. The plant's treated effluent is discharged into local surface waters that drain into the Des Moines River basin, ultimately reaching the Mississippi River. This watershed supports agricultural runoff management and aquatic habitats, making proper treatment essential for downstream water quality in the Mississippi River system.

The plant discharges into tributaries of the Des Moines River, which flows southeast to the Mississippi River. This watershed is part of the larger Mississippi River basin, supporting diverse aquatic life and providing water for irrigation and recreation. The region's agricultural landscape means nutrient management is a key ecological concern to prevent downstream eutrophication.