Danbury Water Pollution Control Facility (WPCF) - Connecticut Wastewater Treatment

Danbury Water Pollution Control Facility (WPCF) is a municipal wastewater treatment plant serving approximately 41,513 residents in Danbury, Connecticut, United States. Located on Filtration Plant Road near Beaver Brook, the facility is part of the city's wastewater infrastructure under the Western Connecticut Planning Region. As a plant serving a medium-sized agglomeration, Danbury WPCF operates under the U.S. Clean Water Act, which requires secondary treatment as a minimum standard for municipal wastewater facilities. The plant's designed capacity is 1.00 million gallons per day, and it is subject to National Pollutant Discharge Elimination System (NPDES) permitting administered by the Connecticut Department of Energy and Environmental Protection (CT DEEP). Treated effluent from the plant discharges into Beaver Brook, a tributary of the Still River, which flows into the Housatonic River and ultimately reaches Long Island Sound. The Housatonic River watershed supports diverse aquatic life and provides drinking water for downstream communities, making effective wastewater treatment critical for protecting water quality in the region.

Danbury WPCF discharges into Beaver Brook, which flows into the Still River, a tributary of the Housatonic River. The Housatonic River drains into Long Island Sound, an ecologically productive estuary supporting fisheries, migratory birds, and marine habitats. The watershed is sensitive to nutrient loading and requires advanced treatment to prevent eutrophication and protect downstream ecosystems.