Montoursville STP - Wastewater Treatment Plant in Upper Fairfield Township, Pennsylvania

Montoursville STP is a municipal wastewater treatment plant located at 565 Chapmans Round Top Road in Upper Fairfield Township, Lycoming County, Pennsylvania. The facility serves a population of about 6,141 residents in the Montoursville area, contributing to local sanitation and water quality management. As a US-based plant serving a small agglomeration, Montoursville STP is subject to the National Pollutant Discharge Elimination System (NPDES) permit program under the Clean Water Act. This regulatory framework requires secondary treatment as a baseline for municipal wastewater, with additional nutrient controls where necessary to protect receiving waters. The plant discharges treated effluent into a local waterway within the Susquehanna River basin, which ultimately drains to the Chesapeake Bay. This connection places the plant within a watershed of significant ecological importance, as the Chesapeake Bay is a large estuary supporting diverse aquatic life and commercial fisheries.

The plant's treated effluent enters a tributary of the West Branch Susquehanna River, which flows into the main stem Susquehanna River and eventually reaches the Chesapeake Bay. The Chesapeake Bay watershed is ecologically sensitive, supporting critical habitats for fish, crabs, and migratory birds. Nutrient loading from wastewater discharges in this basin is a key concern, driving regulatory requirements for phosphorus and nitrogen removal in many facilities.