Arendtsville Municipal Authority Wastewater Treatment Plant, Butler Township, Pennsylvania

The Arendtsville Municipal Authority wastewater treatment plant is located in Butler Township, Adams County, Pennsylvania, United States. It serves a small population of 848 residents, reflecting its role as a local facility for the community. The plant employs advanced treatment processes, exceeding the secondary treatment standards required by the US Clean Water Act. With a designed capacity of 529.96 thousand cubic meters per year and a current discharge volume of 302.83 thousand cubic meters per year, the facility operates under the National Pollutant Discharge Elimination System (NPDES) permit program, which regulates discharges to surface waters. The treated effluent is discharged into local waterways that ultimately drain into the Chesapeake Bay watershed. The plant's advanced treatment helps protect downstream aquatic ecosystems and contributes to the restoration efforts of the Chesapeake Bay, a large estuary of ecological and economic importance.

The plant discharges into streams within the Susquehanna River basin, which flows into the Chesapeake Bay. The Chesapeake Bay is a major estuary that supports diverse aquatic life, including blue crabs, oysters, and migratory fish. Nutrient removal from advanced treatment helps reduce algal blooms and hypoxia in the bay, supporting its ecological health.