PALMYRA WWTP - Secondary Treatment Plant in Palmyra, Indiana

PALMYRA WWTP is a municipal wastewater treatment facility located on McCracken Road Northeast in Palmyra, Harrison County, Indiana. The plant serves a population of approximately 1,475 residents, placing it in the small-agglomeration category under U.S. regulatory frameworks. The facility provides secondary treatment, which is the standard level required by the U.S. Clean Water Act for municipal plants of this scale. With a designed capacity of 529.96 volume units and a current discharge volume of 492.10, the plant operates below its design capacity. As a U.S. facility, it operates under a National Pollutant Discharge Elimination System (NPDES) permit issued by the Indiana Department of Environmental Management, ensuring compliance with effluent limits. The treated effluent is discharged into a local water body that ultimately drains into the Ohio River watershed. The Ohio River is a major tributary of the Mississippi River, supporting diverse aquatic life and providing drinking water for millions downstream. The plant's location inland and away from coastal areas reduces direct marine impact.

The plant discharges into a receiving water body within the Ohio River basin, which flows into the Mississippi River and eventually the Gulf of Mexico. The Ohio River watershed supports a variety of fish species and is an important migratory corridor for waterfowl. Secondary treatment helps reduce organic pollutants and suspended solids, protecting downstream water quality and aquatic habitats.