Adharwadi Wastewater Treatment Plant, Kalyan-Dombivli, Maharashtra

Adharwadi wastewater treatment plant is located in Kalyan-Dombivli, a city in the Thane district of Maharashtra, India. The plant serves a population of approximately 167,030 people, classifying it as a large agglomeration under Indian urban wastewater management standards. It is situated along the Kalyan-Murbad Road, within the Ulhas River basin. As a large-scale facility, Adharwadi is expected to meet the treatment standards set by the Central Pollution Control Board (CPCB) under the Water (Prevention and Control of Pollution) Act, 1974. Plants of this scale in India typically employ secondary treatment technologies such as activated sludge or sequencing batch reactors to comply with discharge norms. The treated effluent from Adharwadi is likely discharged into the Ulhas River, which flows through the region and eventually drains into the Arabian Sea via the Vasai Creek. The Ulhas River supports local agriculture and provides water for domestic and industrial use downstream. The plant plays a critical role in protecting the river's water quality and the ecological health of the Thane Creek and coastal waters.

The Adharwadi plant discharges into the Ulhas River, which flows through the Thane region and empties into the Arabian Sea via Vasai Creek. The river supports diverse aquatic life and is used for irrigation and drinking water supply downstream. The plant's operations help mitigate pollution in this ecologically sensitive watershed, which is influenced by industrial and urban runoff from the Mumbai metropolitan area.