Water Supply

Despite water scarcity, Bengalureans let hundreds of litres of reject RO water down their drains every day without much thought. For every one litre of filtered water, RO (Reverse Osmosis) water purifiers waste 3.5 litres of water. But many Bengaluru households don't even require RO purifiers. “RO water purifiers have become a status symbol. Many residents do not know the purpose of the purifiers, let alone the water quality,” says Vinosh M Paul, independent water purifier sales and service technician in Bengaluru. So, do you need an RO unit?  What are RO water purifiers?  Reverse Osmosis (RO) is an advanced…

Amid the countless wheels lining its roads, the premises of the Rail Wheel Factory (RWF) in Bengaluru's Yelahanka is surprisingly verdant for a government foundry. A spider web-like system of interconnected stormwater drains and water points efficiently directs all water to the pump house or ponds, preventing any runoff. Their rooftop harvesting system allows immediate use of rainwater for production, ensuring zero wastage. Even during the peak of summer 2025, the two main wells, named Damodar and Kandaswamy—essential for production and fire emergencies—remain more than half-full, highlighting RWF’s water efficiency. Rail Wheel Factory uses power-saving ways in which it can…

When the residents of TZED Homes, a community in Whitefield, faced water shortages, they did not immediately resort to using tanker water. Instead, they opted for an unconventional solution — treating and reusing wastewater for potable purposes. It was a difficult decision, and even more challenging to convince all community members to accept. "Until four to five years ago, we could access water at a depth of just 80 feet. However, tankers extracting water from commercial borewells have significantly affected our aquifer," says Babu, a resident closely involved in water management in the community. But, their efforts have paid off…

Nearly 72% of Bengaluru gets contaminated water. Depending on whether residents get their water from borewells, tankers or from the Cauvery River, the quality varies from one area to another. According to a 2018 survey, 24% of Bengaluru households receive water from both borewells and Cauvery, with a hardness level above the prescribed limit of 200 milligrams per litre (mg/l).  Another study found Total Dissolvable Solids (TDS) range crossing 1,000 parts per million (PPM) per litre in Bengaluru, when the acceptable range is a maximum of 300 PPM. TDS refers to the amount of organic and inorganic material dissolved in…

This April 10th, the Bangalore Water Supply and Sewerage Board (BWSSB) announced a water tariff hike after a gap of 11 years. The Board also decided to increase the tariff by 3% on April 1st every year. For most households, the tariff hike would mean paying ₹20 to ₹30 more on their monthly water bills this year. While the middle class sees a slight increase, slum dwellers face exorbitant costs, highlighting a stark inequality in access to clean, affordable water across the city. Here is how the tariff hike will reflect in your water bill this May. For domestic users…

“I’ve seen tiny black worms in this water whenever we store it. But since we don’t have any other source, I strain and boil the water before use,” said Tulasi, mother of two, tediously filling her buckets with Cauvery water from the common tap in Vinayakanagara slum, TC Palya. She stores a drum of water for a week despite her doctor warning her not to store water for more than four days. “What option do I have? We get Cauvery water only once a week for three hours. We get muddy borewell water twice weekly, which we use for non-drinking…

“We had to take Cauvery connections as the common borewell tap went completely dry last summer. Even then, we cannot get a bucket of water without using motors,” said Hajira Bhanu, resident of Triveninagara slum in KR Pura. This slum — 'declared' or officially recognised by the Karnataka Slum Development Board (KSDB) — is comparatively developed. Yet the only water source for nearly 60 houses here is the Cauvery, which comes very faintly for less than three hours, twice a week. The residents have installed motors in their homes to draw water, which is considered illegal by the Bangalore Water…

There seems to be a perpetual water shortage in Mumbai, requiring the Brihanmumbai Municipal Corporation to continually seek new water sources. To fulfil Mumbai’s ever-growing demand for water, a new dam is in the pipeline. The State Wildlife Board has given their approval for the construction of the Gargai dam over 845 hectares of land in Palghar. The dam will provide 440 million litres of water per day (MLD). Environmentalists have expressed concern over the effects of this dam. This will lead to the displacement of 619 families. Moreover, 2.1 lakh trees will be cut to make way for the…

In a bustling neighbourhood of Andheri (West), a housing society's effort to recycle black water is a lesson in self-sufficiency. Evershine Cosmic Co-operative Housing Society, comprising 186 flats, has successfully handled sewage from its homes since 2016. The society has not only reduced its environmental impact but has also managed to use the treated water effectively. This eco-conscious approach has helped the housing society meet its diverse water needs. Not many housing societies in Mumbai operate their own sewage treatment plants (STP) mainly because this involves demanding work and overseeing every step of the process. Besides, with the Brihanmumbai Municipal…

Although Mumbai has sufficient groundwater, experts opine that it is depleting at a fast rate due to rapid urbanisation and massive construction projects. There's also a lack of clear groundwater regulations and systematic records of private borewells and dug wells.  This guide provides a comprehensive overview of the rules, processes, and penalties associated with digging a borewell and extracting groundwater in Mumbai. Getting permission for groundwater extraction What are the rules for digging a borewell and extracting groundwater in Mumbai? In Mumbai, borewell digging and groundwater management are regulated under the Maharashtra Groundwater (Development and Management) Act 2009. According to…