Masontown Municipal Authority Catts Run Wastewater Treatment Plant, Pennsylvania

The Masontown Municipal Authority Catts Run wastewater treatment plant is located in Masontown, Fayette County, Pennsylvania, serving a population of 2,002. The facility operates under the regulatory framework of the US Clean Water Act, which requires secondary treatment for municipal wastewater discharges. The plant provides secondary treatment, a standard biological process that removes organic matter and suspended solids. With a designed capacity of 719.23 million gallons per year, the facility operates at full capacity based on reported discharge volumes. As a small municipal plant, it is subject to EPA National Pollutant Discharge Elimination System (NPDES) permitting requirements administered by the Pennsylvania Department of Environmental Protection. The treated effluent is discharged into Catts Run, a tributary of the Monongahela River, which flows into the Ohio River and ultimately the Mississippi River system. The plant plays a key role in protecting local water quality in the Monongahela River basin, supporting aquatic life and downstream communities.

The plant discharges into Catts Run, a small stream that flows into the Monongahela River in southwestern Pennsylvania. The Monongahela River joins the Allegheny River to form the Ohio River, part of the Mississippi River watershed. This region supports diverse aquatic species and is important for recreation and drinking water supplies downstream. The secondary treatment helps reduce nutrient and pollutant loads to the river system.