Carmel T SD 5 STP Hillsdale - Advanced Wastewater Treatment in Town of Carmel, New York

Carmel T SD 5 STP Hillsdale is an advanced wastewater treatment facility located in the Town of Carmel, Putnam County, New York. Serving a small population of 250 residents, this plant plays a role in managing local wastewater in the Hudson Valley region. The plant provides advanced treatment, which goes beyond secondary treatment to remove additional nutrients and contaminants. With a designed capacity of 102.21 million gallons per year and an annual discharge volume of 79.49 million gallons, it operates under the regulatory framework of the U.S. Clean Water Act, which requires NPDES permits for discharges into surface waters. The treated effluent from the plant is discharged into a local water body that ultimately drains into the Hudson River watershed. The Hudson River estuary supports diverse aquatic life and is an important ecological corridor. The plant's advanced treatment helps protect downstream water quality in this sensitive watershed.

The plant discharges into a tributary of the Hudson River, which flows south to New York Harbor and the Atlantic Ocean. The Hudson River estuary is a critical habitat for migratory fish such as striped bass and American shad, and its health depends on nutrient management from upstream wastewater facilities. Advanced treatment at this plant reduces nutrient loading, supporting the ecological balance of the watershed.