DUNLAP STL Wastewater Treatment Plant, Dunlap, Iowa

DUNLAP STL is a municipal wastewater treatment plant located in Dunlap, Iowa, United States. The facility serves a small community of approximately 1,042 residents and operates under the regulatory framework of the U.S. Clean Water Act, which requires secondary treatment for municipal discharges. The plant provides secondary treatment, a standard level for small agglomerations in the United States. Its designed capacity is 567.81 cubic meters per day, matching the reported discharge volume, indicating consistent operation. As a U.S. facility, it is subject to National Pollutant Discharge Elimination System (NPDES) permitting, which sets effluent limits to protect water quality. The treated effluent is discharged into a local water body within the Missouri River basin. The plant plays a key role in protecting downstream water quality in this agricultural region, supporting aquatic life and recreational uses in the watershed.

The plant discharges into a tributary of the Missouri River, which flows into the Mississippi River and ultimately the Gulf of Mexico. The local watershed is predominantly agricultural, and the plant's secondary treatment helps reduce nutrient loads that could contribute to hypoxia in the Gulf. The facility supports the ecological health of the Missouri River basin by controlling organic pollutants and suspended solids.