Overview
Greencastle Franklin STP serves approximately 4,821 people in Antrim Township, Pennsylvania. The plant operates under the US Clean Water Act, which mandates secondary treatment for municipal wastewater facilities.
Greencastle Franklin STP is a municipal wastewater treatment plant located in Antrim Township, Franklin County, Pennsylvania. It serves a population of about 4,821 residents in the rural community near the Maryland border. As a US facility, the plant is subject to the Clean Water Act and National Pollutant Discharge Elimination System (NPDES) permitting. For plants serving fewer than 10,000 people, secondary treatment is typically required, which removes at least 85% of biochemical oxygen demand and suspended solids. The plant discharges treated effluent into a local waterway that ultimately drains into the Potomac River watershed and then to the Chesapeake Bay. Its operation helps protect downstream aquatic ecosystems and supports water quality in the Chesapeake Bay estuary.
Environmental context
The plant's treated effluent flows into a tributary of the Potomac River, which drains into the Chesapeake Bay, the largest estuary in the United States. The Chesapeake Bay watershed supports diverse aquatic life, including blue crabs, striped bass, and oysters, and is sensitive to nutrient pollution. The plant's discharge contributes to local water quality management in this ecologically significant region.
Frequently asked questions
Greencastle Franklin STP is located on Grant Shook Road in Worleytown, Antrim Township, Franklin County, Pennsylvania, near the Maryland border.
The plant serves approximately 4,821 people in the Antrim Township area.
The plant discharges treated effluent into a local waterway that flows into the Potomac River watershed, ultimately reaching the Chesapeake Bay.
As a US municipal wastewater plant, it operates under the Clean Water Act and is regulated via an NPDES permit issued by the Pennsylvania Department of Environmental Protection.
For small communities under 10,000 people, US regulations typically require secondary treatment, which removes at least 85% of organic matter and suspended solids.
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