Urban Wastewater Management (UWM)

The 72,368 MLD Problem: India’s Urban Wastewater Crisis

On November 28, 2025, residents of Patna reported sewage mixing with the municipal drinking water supply, leading to an outbreak of cholera that affected over 2,000 people in one week. This is not an isolated incident. Despite generating approximately 72,368 Million Litres Per Day (MLD) of urban wastewater, India’s treatment capacity hovers around 28%–44%. The gap between generation and treatment is no longer just a number—it’s an acute, systemic failure threatening public health, economic productivity, and environmental sustainability in cities nationwide.

The Core Policy Instrument: Fragmented Governance

Urban Wastewater Management (UWM) in India sits at the intersection of infrastructure, governance, and technology, but the institutional framework is fractured. Urban Local Bodies (ULBs) carry primary responsibility under the 74th Constitutional Amendment, yet they lack both autonomy and resources to address the crisis. Central schemes like the AMRUT (Atal Mission for Rejuvenation and Urban Transformation) focus disproportionately on urban water supply, sidelining sewage management. Budgetary allocations for wastewater treatment under central missions remain meagre compared to the scale of the problem.

Where infrastructure exists, physical separation between sewerage and drinking water networks is rare. Approximately 55% of urban households are not connected to a sewer network; they rely on septic tanks or pit latrines, which often leak untreated waste into groundwater. In cities like Ghaziabad and Kanpur, ageing pipelines exacerbate the risk of seepage, as corroded water-supply systems fail to maintain integrity under rapidly growing population pressures. The infinite churn of urbanisation is outpacing incremental infrastructure upgrades.

The Case For Decentralised and Technological Solutions

Proponents of decentralized wastewater treatment systems (DEWATS) argue that these localized units hold tremendous potential in reducing the burden on centralised sewerage infrastructure. Compact treatment facilities installed at residential complexes, industrial parks, and high-density urban settlements can enable partial recycling and sidestep the risk of cross-contamination. Pilot successes under the AMRUT program in Surat and Pune indicate a 30% reduction in dependency on centralised pipelines when DEWATS are implemented judiciously.

Technological interventions such as real-time monitoring, IoT sensors, and AI, as highlighted in the 2025-26 CPCB (Central Pollution Control Board) guidelines, offer energy-efficient alternatives to traditional treatment systems. For example, predictive AI can identify leak-prone sections in overburdened networks before contamination occurs. While the Centre has allocated ₹3,200 crore to strengthen urban water infrastructure under AMRUT 2.0, much depends on ULBs adopting such advanced methods at district and ward levels.

Economic mechanisms like the “polluter pays principle” and creating a market for treated wastewater—selling it for industrial cooling or construction—could improve cost recovery for sewerage projects. Cities that have enforced sewerage charges have seen higher levels of accountability and infrastructure upgrades. Bengaluru alone raised nearly ₹125 crore in sewerage tax during FY 2024-25, a promising indicator of fiscal sustainability.

The Case Against Current Frameworks

Despite these optimistic projections, there are significant downsides that policy champions ignore or understate. First, decentralized treatment systems like DEWATS often lack rigorous oversight. Small-scale operators rarely comply with environmental discharge standards, especially in informal urban settlements. The risk of untreated sewage leaking into public water reservoirs persists unless ULBs enforce stringent verification frameworks.

The institutional limitations of ULBs are a glaring bottleneck. A majority of ULBs lack technical staff to even map existing sewer pipelines effectively, let alone supervise DEWATS or monitor cross-contamination. Without state support, municipal corporations continue to fall back on ad hoc measures, like diverting untreated effluent directly into rivers—an irony as “Namami Gange” funds simultaneously flow to clean the Ganga.

Moreover, the economic constraints are foundational. High Non-Revenue Water (NRW) losses—accounts of water supplied but unbilled—cripple the ability to maintain and extend wastewater infrastructure. Unrealistic user tariffs and inconsistent collection mechanisms further discourage private players from participating in wastewater projects. The result? Only half-hearted implementation of ambitious schemes, with no substantive urban gains.

Lessons From Singapore: Integrated Governance and Technology

Singapore presents a telling contrast to India’s urban wastewater challenges. It turned its wastewater into an asset through NEWater, a public-private initiative that treats sewage to potable quality using advanced membrane technologies and UV disinfection. Today, NEWater contributes 40% of Singapore's total water needs. Unlike India’s fragmented governance model, Singapore operates under the unified oversight of PUB (Public Utilities Board), which integrates water supply and sewage treatment seamlessly. The city-state has also mandated dual plumbing systems for recycled water use in all new developments, ensuring low contact risk and high reuse efficiency.

However, replicating Singapore’s model in India would require colossal reforms in governance, infrastructure modernization, and sustained public investment. India’s UWM crisis cannot be resolved with standalone technological interventions—it demands systemic overhaul.

Where Things Stand

The path forward for India’s UWM lies in balancing decentralised solutions with integrated institutional reforms. Addressing governance fragmentation—allocating specific sewerage-related mandates to ULBs and building their technical capacity—is non-negotiable. While technological optimism like IoT sensors appears promising, its success largely depends on the organisational willingness to adopt and standardize practices. Economic constraints, particularly in smaller municipalities, will continue to hinder progress unless treated wastewater markets are scaled up.

Ultimately, the largest risk is political economy inertia. Infrastructure investment in sanitation rarely garners the attention of electoral stakeholders, pushing it perpetually to the backburner. Whether India’s cities mitigate waterborne diseases and environmental degradation will hinge on how seriously political actors take UWM as an integral issue—not just an event-driven emergency response.

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