Mendon WWTP and Sewer System - Secondary Treatment Plant in Mendon, Ohio

Mendon WWTP and Sewer System is a municipal wastewater treatment facility located in Mendon, Ohio, a small village in Mercer County. The plant serves a population of approximately 700 residents, providing essential wastewater treatment for the community. As a secondary treatment facility, it meets the standard requirements for domestic wastewater treatment in the United States. The plant has a designed capacity of 378.54 million liters per day and currently treats an average daily flow of 340.69 million liters, indicating efficient utilization of its infrastructure. Under the U.S. Clean Water Act, the plant operates under a National Pollutant Discharge Elimination System (NPDES) permit, which sets limits on effluent quality to protect receiving waters. Secondary treatment typically involves biological processes to reduce organic matter and suspended solids. The treated effluent is discharged into a local water body, likely a tributary of the Wabash River or the St. Marys River, which ultimately drains into the Ohio River and then the Mississippi River system. The plant plays a key role in protecting downstream water quality and aquatic ecosystems in the region.

The plant discharges into a local stream that is part of the Wabash River watershed, which flows into the Ohio River and eventually the Mississippi River. This region supports diverse aquatic life, including fish and macroinvertebrates, and the plant's secondary treatment helps reduce nutrient and organic pollution that could otherwise cause eutrophication or oxygen depletion downstream.