Kamarhati Mathkol near Belgachia Metro Car Shed Wastewater Treatment Plant, Baranagar

Kamarhati Mathkol near Belgachia Metro Car Shed is a wastewater treatment plant located in Gorabazar, Baranagar, within the Kolkata Metropolitan Area in West Bengal, India. The plant serves a population of 267,248, classifying it as a large agglomeration under Indian urban wastewater management standards. It is situated in the densely populated North 24 Parganas district, near the Hooghly River. As a large-scale plant, it is expected to provide at least secondary treatment under India's environmental regulations, which align with the National River Conservation Plan and the Water (Prevention and Control of Pollution) Act of 1974. The plant's operational status indicates it is actively managing wastewater from the surrounding urban area, contributing to the reduction of pollution in local water bodies. The treated effluent from the plant likely discharges into the Hooghly River, a distributary of the Ganges, which flows into the Bay of Bengal. This river supports diverse aquatic life and is a critical water source for millions. The plant plays a key role in protecting the Hooghly River ecosystem from untreated sewage, especially given the high population density of the Kolkata Metropolitan Area.

The plant's treated wastewater is expected to enter the Hooghly River, a major distributary of the Ganges, which flows through West Bengal before emptying into the Bay of Bengal. The Hooghly River supports a rich ecosystem, including fish species and migratory birds, and is vital for agriculture and drinking water. The plant helps mitigate pollution in this ecologically sensitive river, reducing the risk of eutrophication and protecting downstream habitats in the Sundarbans delta.