SLTMA Colebrook STP - Advanced Wastewater Treatment in South Londonderry Township, Pennsylvania

SLTMA Colebrook STP is a municipal wastewater treatment facility located in South Londonderry Township, Lebanon County, Pennsylvania. The plant serves a small population of 397 residents, reflecting its role in a rural or suburban community within the Susquehanna River basin. The plant provides advanced treatment, which goes beyond the secondary treatment standard required by the US Clean Water Act. Advanced treatment typically includes nutrient removal (nitrogen and phosphorus) or other tertiary processes. The plant has a designed capacity of 151.42 volume units and discharges a similar volume, indicating it operates near its design capacity. The treated effluent from the plant ultimately drains into the Susquehanna River watershed, which flows into the Chesapeake Bay. As part of the Chesapeake Bay Program, plants in this region are often subject to nutrient reduction requirements to protect the bay's ecosystem. The advanced treatment level helps reduce nutrient loading to the sensitive estuary.

The plant discharges into the Susquehanna River basin, which flows into the Chesapeake Bay, the largest estuary in the United States. The Chesapeake Bay is ecologically sensitive, supporting diverse aquatic life including blue crabs, oysters, and migratory fish. Nutrient pollution from wastewater is a key concern, and advanced treatment helps mitigate algal blooms and hypoxia in the bay.