Mumbai’s municipal administration is moving to convert a long-overlooked urban byproduct into a potential revenue source, as it advances a plan to commercially supply treated wastewater from one of its coastal treatment facilities. The initiative signals a shift towards resource recovery in urban infrastructure, with implications for water conservation, municipal finances, and construction practices across the city.
At the centre of the proposal is the sale of treated wastewater from the Colaba sewage treatment plant, where a portion of processed water is currently released into the sea due to limited demand. By creating a structured treated wastewater reuse market, the civic body aims to redirect this surplus towards non-potable applications such as construction activity, landscaping, and maintenance operations. Municipal officials indicate that a defined quantity of treated water will be supplied at a concessional rate to intermediaries, who will in turn distribute it to infrastructure and real estate projects, including large-scale tunnelling works in South Mumbai. The pricing has been positioned competitively against privately sourced non-potable water, which is already used informally across the construction sector.
The Colaba facility has a significantly higher processing capacity than its current utilisation for advanced treatment, allowing for expansion of supply if demand stabilises. Civic engineers note that the cost of further purification to non-drinking standards remains relatively low, making the model financially viable if scaled effectively. The treated wastewater reuse strategy is also expected to partially offset operational expenses of sewage treatment infrastructure, which typically rely heavily on municipal budgets. However, the plan has triggered debate within civic circles about optimal allocation of treated water. Several elected representatives and urban planners argue that the first priority should be internal municipal use, including road cleaning, fire services, public gardens, and transport depots. They contend that deploying reclaimed water across these functions could significantly reduce reliance on potable water, especially in a city that faces seasonal supply stress.
Environmental experts view the initiative as a step in the right direction but caution that governance frameworks must ensure equitable distribution and transparency. In many global cities, wastewater reuse forms a critical component of circular urban systems, reducing freshwater extraction and improving resilience to climate variability. Mumbai, with its dense population and coastal geography, stands to benefit from such integrated water management practices. The proposal also underscores a broader transition in how Indian cities are approaching infrastructure assets — not merely as service providers but as systems capable of generating economic value while delivering environmental outcomes. Yet, its success will depend on sustained demand, regulatory clarity, and public confidence in the safety and utility of reclaimed water.
As Mumbai continues to invest in sewage treatment upgrades, the next phase will likely focus on expanding tertiary treatment capacity and building distribution networks. Whether the current initiative evolves into a citywide treated wastewater reuse ecosystem will hinge on how effectively policy, pricing, and public infrastructure align in the months ahead.
BMC Plans To Monetise Treated Wastewater Supply
