Technology
Thane-Borivali Tunnel Cuts Water Use With Treated Sewage Innovation
The project reuses treated sewage instead of fresh water for concrete work while Borivali maintains cooler temperatures near its national park.
How we reported this
Borivali recorded temperatures 2-3°C lower than the rest of Mumbai in 2026 because of its location next to a 100-square-kilometer national park. The Thane-Borivali Tunnel project now reuses treated sewage water for concrete casting and saves 1,000 kiloliters of potable water every day.
Why the tunnel method matters now
Mumbai construction sites still draw large volumes of city water for mixing concrete. The tunnel approach replaces that draw with treated sewage, directly cutting demand on the municipal supply. The same national park buffer that keeps Borivali cooler also gives the area room to test these methods without adding heat-island pressure.
Green Technologies at the Western Express Highway site in Borivali East lists the tunnel water-reuse system among its documented projects. Residents and contractors can see the daily 1,000-kiloliter figure on the company’s project summaries rather than relying on general estimates.
Local installations already delivering numbers
Bhoomi Green CHS in Borivali East fitted a 74 kWp solar array in 2017. The system cuts the society’s annual electricity bill by roughly Rs 11.7 lakh and is projected to avoid 2,276 tons of carbon emissions across ten years. BPCL’s Mumbai Refinery, also in Borivali, added 1 MW of solar capacity that includes panels spanning ANIK Nallah and paired it with rainwater harvesting to trim 365 tons of CO2 each year.
CBSE schools in Borivali East have followed with rooftop solar, LED lighting upgrades and energy-efficient building designs that reduce daytime grid draw. These examples sit within the same neighbourhood cluster served by Metro Lines 2A and 7, so commuters can reach the sites without extra vehicle trips.
Contractors and housing societies can review the tunnel water-reuse specification and the 74 kWp installation records directly from the listed project pages. The same approach applies to any new concrete pour or rooftop array in Borivali East: check the daily water volume saved or the annual kilowatt-hour output before signing the work order.