STP Kalyani II - Wastewater Treatment Plant in Kalyani City, West Bengal, India

STP Kalyani II is a municipal wastewater treatment plant located in Kalyani City, within the Kolkata Metropolitan Area in the Nadia district of West Bengal, India. The plant serves an estimated population of 40,087, classifying it as a medium-sized agglomeration under Indian urban wastewater management standards. As a plant operating in India, it falls under the regulatory framework of the Central Pollution Control Board (CPCB) and the West Bengal Pollution Control Board. Indian environmental norms require secondary treatment for wastewater before discharge into inland surface waters. The plant's operational status indicates it is actively treating sewage from the surrounding urban area. The treated effluent from STP Kalyani II is likely discharged into local water bodies that drain into the Hooghly River, a distributary of the Ganges. The Hooghly River flows through the Kolkata region and ultimately empties into the Bay of Bengal. This river system supports diverse aquatic life and is critical for water supply and agriculture in the region.

STP Kalyani II discharges treated wastewater into local streams that feed the Hooghly River, a major distributary of the Ganges. The Hooghly River flows southward through the Sundarbans delta before reaching the Bay of Bengal. This watershed supports a rich ecosystem, including fish species and migratory birds, and is vital for the livelihoods of millions in West Bengal. Proper treatment helps reduce nutrient and pathogen loads entering this sensitive riverine environment.