Willimantic WPCF - Wastewater Treatment Plant in Willimantic, Connecticut

Willimantic WPCF is a municipal wastewater treatment facility located at 15 Main Street in Willimantic, Connecticut, within the Southeastern Connecticut Planning Region. The plant serves a population of about 19,657 residents, classifying it as a medium-sized agglomeration under US regulatory standards. As a US facility, Willimantic WPCF operates under the Clean Water Act and is subject to National Pollutant Discharge Elimination System (NPDES) permits issued by the Connecticut Department of Energy and Environmental Protection. These permits set effluent limits to protect water quality in the receiving water body. The plant's designed capacity is 1.00 million gallons per day, indicating its scale of operations. The plant discharges treated wastewater into the Willimantic River, which flows into the Shetucket River and then the Thames River, ultimately reaching Long Island Sound. This watershed supports diverse aquatic life and is an important ecological corridor in southeastern Connecticut. The plant's performance is critical to maintaining water quality in this downstream system.

Willimantic WPCF discharges into the Willimantic River, a tributary of the Shetucket River, which flows into the Thames River and empties into Long Island Sound. The watershed supports diverse aquatic species and provides habitat for migratory fish. The plant's discharge must meet NPDES permit limits to protect downstream water quality and the ecological health of Long Island Sound.