Adharwadi Wastewater Treatment Plant, Kalyan-Dombivli, Maharashtra

Adharwadi wastewater treatment plant is located in Kalyan-Dombivli, Maharashtra, India. It serves a population of approximately 107,000 people, classifying it as a medium-to-large agglomeration under Indian urban wastewater management norms. The plant is currently non-operational. As a non-operational facility, the plant does not currently provide treatment. Under India's regulatory framework, such plants are typically required to meet standards set by the Central Pollution Control Board (CPCB) for discharge into inland surface waters. For agglomerations of this scale, secondary treatment is generally mandated, with possible tertiary treatment if discharging into sensitive areas. The region drains into the Ulhas River and eventually into the Arabian Sea. The plant's non-operational status may pose environmental risks to local water bodies if untreated sewage is discharged. The surrounding area is densely populated and industrial, highlighting the importance of restoring operations to protect downstream ecosystems.

The plant is situated in the Ulhas River basin, which flows through the Thane district and empties into the Arabian Sea near Mumbai. The Ulhas River supports diverse aquatic life and is used for irrigation and domestic purposes downstream. The region experiences a tropical monsoon climate, with heavy rainfall from June to September. The non-operational status of the plant could contribute to pollution in the river and coastal waters, affecting local fisheries and water quality.