Overview
Colaba wastewater treatment plant in Mumbai, Maharashtra, India serves approximately 274,600 people. The facility is operational and located within 50 km of the coast, discharging into the Arabian Sea.
Colaba wastewater treatment plant is a municipal facility located in the Colaba neighborhood of Mumbai, Maharashtra, India. Serving an estimated 274,600 people, it is one of several plants managing wastewater from India's largest city. The plant is situated in a densely populated coastal urban area, reflecting the scale of infrastructure needed for this megacity. As a plant serving a large agglomeration, it operates under India's environmental regulations, including the Water (Prevention and Control of Pollution) Act of 1974 and the National Green Tribunal guidelines. Indian wastewater treatment standards typically require secondary treatment for plants of this scale, with some facilities incorporating tertiary treatment for reuse or sensitive discharge zones. The plant's designed capacity is 1.00 million liters per day, indicating a significant treatment volume. The treated effluent from Colaba plant ultimately discharges into the Arabian Sea via local drainage networks. The coastal waters of Mumbai support diverse marine life and are important for local fisheries. The plant plays a critical role in reducing pollution loads to the marine environment, helping to protect coastal ecosystems and public health in the Mumbai harbor area.
Environmental context
The Colaba plant discharges into the Arabian Sea through Mumbai's coastal drainage system. The receiving waters are part of the highly urbanized Mumbai coast, which supports estuarine and marine habitats. The area is ecologically sensitive due to its role as a nursery for fish and crustaceans, and the plant's treatment performance directly affects water quality in the nearshore zone and the broader coastal ecosystem.
Frequently asked questions
The Colaba wastewater treatment plant is located in the Colaba neighborhood of Mumbai, Maharashtra, India, at Nanabhai Moos Marg (Upper Colaba Road), Dhobi Ghat, Colaba, A Ward, Zone 1.
The Colaba plant serves approximately 274,600 people, making it a large agglomeration facility in the Mumbai metropolitan area.
The treated wastewater from the Colaba plant is discharged into the Arabian Sea via the local coastal drainage network. The plant is located within 50 km of the coast, and its effluent contributes to the marine discharge in the Mumbai harbor area.
The Colaba plant operates under India's Water (Prevention and Control of Pollution) Act of 1974 and rules set by the National Green Tribunal. For large agglomerations like this, secondary treatment is typically required, with possible tertiary treatment for reuse or sensitive areas.
In India, wastewater treatment plants serving large populations (over 100,000) are generally required to provide at least secondary treatment, often with nutrient removal. Some facilities also incorporate tertiary treatment for water reuse or to meet stringent discharge standards for coastal waters.
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