Lewistown Boro STP - Wastewater Treatment Plant in Lewistown, Pennsylvania

Lewistown Boro STP is a municipal wastewater treatment plant located in Lewistown, Mifflin County, Pennsylvania. The facility serves a population of around 17,083 residents, classifying it as a medium-sized agglomeration under US regulatory standards. As a US-based plant, it operates under the Clean Water Act and is subject to National Pollutant Discharge Elimination System (NPDES) permits issued by the Pennsylvania Department of Environmental Protection. The plant discharges treated effluent into the Juniata River watershed, which flows into the Susquehanna River and ultimately reaches the Chesapeake Bay. This makes the plant's performance important for downstream water quality and the health of the Chesapeake Bay ecosystem.

The plant discharges into the Juniata River, a tributary of the Susquehanna River, which flows into the Chesapeake Bay. The Chesapeake Bay is the largest estuary in the United States and supports diverse aquatic life, including blue crabs, oysters, and migratory fish. Nutrient loading from wastewater treatment plants in the watershed is a key concern for bay health, and plants like Lewistown Boro STP are subject to nutrient reduction requirements under the Chesapeake Bay Total Maximum Daily Load (TMDL).