Oldenburg WWTP - Secondary Treatment Plant in Oldenburg, Indiana

Oldenburg WWTP is a municipal wastewater treatment facility located in Oldenburg, Indiana, United States. It serves a population of approximately 1,581 residents, classifying it as a small-scale treatment plant within the state's wastewater infrastructure. The plant provides secondary treatment, which is the standard level required by the U.S. Clean Water Act for municipal wastewater. With a designed capacity of 567.81 units and a matching discharge volume, the facility operates at full capacity. As a U.S. plant, it operates under the National Pollutant Discharge Elimination System (NPDES) permit program, which sets effluent limits to protect water quality. The treated effluent is discharged into local streams that are part of the Ohio River basin, ultimately draining into the Mississippi River and the Gulf of Mexico. The plant plays a key role in protecting the region's water resources from untreated sewage and nutrient pollution.

The plant discharges into tributaries of the Whitewater River, which flows into the Ohio River and then the Mississippi River before reaching the Gulf of Mexico. The local watershed supports diverse aquatic life and is used for recreation and drinking water downstream. Proper treatment helps prevent eutrophication and pathogen contamination in these waters.