Suffolk Co SCSD22 Hauppauge STP - Hauppauge, New York Wastewater Treatment Plant

Suffolk Co SCSD22 Hauppauge STP is a municipal wastewater treatment plant located in Hauppauge, Suffolk County, New York. It serves a small population of 1,307 residents in the Town of Smithtown area. The plant is situated on Veterans Memorial Highway and operates as part of Suffolk County's wastewater infrastructure. The plant provides secondary treatment, which is the standard level required under the US Clean Water Act for municipal facilities. Its designed capacity is 764.65 units, with a current discharge volume of 370.97 units, indicating it operates below capacity. As a US facility, it is regulated under the National Pollutant Discharge Elimination System (NPDES) permit program, administered by the New York State Department of Environmental Conservation. The plant's treated effluent is discharged into local waterways that ultimately drain to the Long Island Sound, an ecologically significant estuary. The proximity to the coast (within 10 km) means the discharge can influence coastal water quality and marine habitats. The plant plays a role in protecting the region's aquatic ecosystems from untreated sewage.

The plant discharges into the Nissequogue River watershed, which flows into the Long Island Sound. The Sound is a vital estuary supporting diverse marine life, including shellfish, finfish, and migratory birds. The plant's coastal location means its effluent can affect nearshore water quality and habitats, making treatment performance important for local ecology.