Sprague WPCF - Secondary Wastewater Treatment Plant in Baltic, Connecticut

Sprague WPCF is a municipal wastewater treatment facility located in Baltic, Connecticut, within the town of Sprague. The plant serves a population of approximately 2,000 residents and is classified as a small-scale treatment facility in the Southeastern Connecticut Planning Region. The plant provides secondary treatment, which is the standard level required by the US Clean Water Act for municipal wastewater. With a designed capacity of 1,514.16 thousand cubic meters per year and an actual discharge volume of 870.65 thousand cubic meters, the facility operates below its full capacity. As a US plant, it is regulated under the National Pollutant Discharge Elimination System (NPDES) permit program, administered by the Connecticut Department of Energy and Environmental Protection. The treated effluent is discharged into a local water body that ultimately drains into the Thames River watershed, which flows into Long Island Sound. This coastal estuary supports diverse aquatic life and is an important ecological and recreational resource for the region. The plant's operations help protect water quality in the downstream environment.

The plant discharges into a tributary of the Thames River, which flows south into Long Island Sound, a major estuary on the Atlantic coast. The Sound supports diverse marine life, including shellfish, finfish, and migratory birds, and is a critical habitat for several species. The plant's secondary treatment helps reduce nutrient and pollutant loads, contributing to the ecological health of this sensitive coastal ecosystem.