Why Mumbai Is Using Sound Waves to Tackle Water Losses of Nearly One-Third

Mumbai is exploring advanced sound-based technology to detect underground water leaks as the city grapples with significant water losses, ageing pipelines and growing pressure on its water supply.

The Brihanmumbai Municipal Corporation (BMC) estimates that around 34% of the water supplied to the city is lost through leakages and theft, highlighting the need to modernise its distribution network.

The move comes as Mumbai faces water-supply constraints amid insufficient rainfall. The civic body has imposed a 10% water cut and is considering technology-led measures to conserve supplies and improve the efficiency of its distribution system.

Why Is Mumbai Losing So Much Water?

Mumbai’s extensive water distribution network stretches approximately 6,000 kilometres, with many pipelines ageing and vulnerable to damage. Leaks can remain undetected underground for long periods, allowing substantial quantities of treated water to escape before reaching households and businesses.

According to the BMC’s estimates, around 1,394 million litres of water are lost daily through leakages and theft. These losses place additional pressure on reservoirs and treatment facilities, particularly when rainfall is inadequate and demand remains high.

Illegal water connections and theft also contribute to the problem. As a result, the challenge is not simply producing enough water but ensuring that more of the available supply reaches consumers.

How Can Sound Waves Detect Underground Leaks?

The BMC is exploring Sound Navigation and Ranging (SONAR) technology and other leak-detection equipment to locate damaged sections of buried pipelines more accurately.

The principle behind acoustic leak detection is relatively straightforward: water escaping through a crack or hole creates vibrations and distinctive sounds as it moves under pressure. Specialised sensors can detect these signals and help engineers identify the likely location of a leak.

The process can help officials pinpoint problem areas without immediately excavating long stretches of road.

Traditional methods may require workers to investigate several locations before finding the source of a leak. Sound-based equipment can narrow the search area, potentially reducing unnecessary digging, traffic disruption and repair time.

Acoustic detection is not infallible, however. Background noise, pipe material, water pressure and the depth of underground infrastructure can affect accuracy. The technology must therefore be selected and tested according to local conditions.

BMC Plans to Accelerate Pipeline Replacement

Alongside leak detection, the civic body plans to increase the pace of replacing ageing water pipelines.

The BMC currently replaces approximately 60–70 kilometres of pipeline annually. It aims to raise that figure to between 250 and 300 kilometres a year, significantly expanding the scale of infrastructure renewal.

Replacing deteriorating pipes is important because detecting leaks alone will not solve the problem if damaged sections continue to fail.

A combination of modern detection equipment, targeted repairs and systematic pipeline replacement could help the city reduce water losses over time.

Why the Technology Matters Amid Mumbai’s Water Shortage

Water lost before reaching consumers represents both a resource and a financial cost. Treating and pumping water requires infrastructure, energy and public expenditure, making avoidable losses particularly expensive.

Reducing leakage could allow Mumbai to make better use of its existing water supply rather than relying exclusively on additional sources.

More effective leak detection could also help reduce the need for repeated road excavation and minimise disruption to residents and commuters.

However, the potential benefits will depend on how quickly the BMC adopts suitable equipment, identifies priority areas and completes repairs after leaks are detected.

Can Sound Waves Solve Mumbai’s Water Crisis?

Acoustic technology could become an important tool in Mumbai’s efforts to conserve water, but it is not a standalone solution.

The city will also need to modernise its distribution network, address illegal connections, improve monitoring and ensure that identified leaks are repaired promptly. Accurate water audits will be essential to determine how much water is lost through physical leakage compared with theft and other distribution inefficiencies.

With approximately one-third of its supplied water reportedly going missing, Mumbai faces a substantial opportunity to improve its water management.

The central challenge is turning leak detection into measurable savings. If the BMC combines effective technology with faster repairs and sustained infrastructure investment, more of the city’s treated water could reach the people who need it.