BUTLER STP - Secondary Wastewater Treatment Plant in Butler, Kentucky

BUTLER STP is a municipal wastewater treatment plant located in Butler, Pendleton County, Kentucky, United States. The facility serves a population of approximately 800 residents and operates under secondary treatment standards, which is the minimum required by the US Clean Water Act for municipal plants. The plant has a designed capacity of 1,347.60 m³/day and currently discharges 189.27 m³/day of treated effluent. As a secondary treatment facility, it uses biological processes to reduce organic matter and suspended solids before discharge. The plant is regulated under the US EPA National Pollutant Discharge Elimination System (NPDES) permit program, which sets effluent limits and monitoring requirements. The treated wastewater is discharged into a local waterway that ultimately drains into the Ohio River basin. The Ohio River is a major tributary of the Mississippi River, supporting diverse aquatic life and providing drinking water for millions. The plant's location inland and its small population served contribute to a lower environmental footprint compared to larger coastal facilities.

The plant discharges into a tributary of the Ohio River, 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 birds. The plant's secondary treatment helps protect downstream water quality by reducing nutrient and pollutant loads.