Suffolk Co SCSD 3 SOUTHWEST Wastewater Treatment Plant, Town of Babylon, New York

Suffolk Co SCSD 3 SOUTHWEST is a major wastewater treatment facility located at 600 Bergen Avenue in the Town of Babylon, Suffolk County, New York. Serving a population of 400,100, it is classified as a large agglomeration under US regulatory frameworks. The plant is situated in a densely populated suburban area on Long Island, near the south shore. As a large municipal plant, it is subject to stringent effluent limitations under the US Clean Water Act and is permitted through the National Pollutant Discharge Elimination System (NPDES) program, administered by the New York State Department of Environmental Conservation. Plants of this scale typically employ advanced secondary or tertiary treatment to meet water quality standards, especially given the sensitive coastal environment. The plant's discharge ultimately reaches the Atlantic Ocean via the Great South Bay or nearby coastal waters. The receiving waters are ecologically significant, supporting diverse marine life and serving as habitat for fish, shellfish, and migratory birds. The facility plays a critical role in protecting the region's water quality and public health.

The plant discharges into the Great South Bay, a shallow lagoon separated from the Atlantic Ocean by barrier islands. This bay is part of the larger South Shore Estuary Reserve, which provides critical habitat for finfish, shellfish, and waterfowl. The area is ecologically sensitive due to its role in nutrient cycling and as a nursery for marine species. Downstream, waters flow through inlets to the Atlantic Ocean, impacting coastal ecosystems along the New York Bight.