BWSSB to up sewage treatment capacity by 470 MLD in 26 new STPs by year-end
The Bangalore Water Treatment and Sewerage Board (BWSSB) is working towards adding 470 MLD capacity to treat sewage in 26 new Sewage Treatment Plants (STPs) by the end of 2025.
This would mean an addition of around 35% sewage treatment capacity to the existing 1,348.5 MLD capacity in 34 STPs, and take the city's treatment capacity to 1,818.5 MLD. The biggest of them all is coming at the Vrishabhavathi Valley, Mysuru Road, with a capacity of 150 MLD, followed by STPs at Hebbal and Horamavu of 60 MLD capacity each. Significantly, 14 of these new STPs with a combined capacity of 124 MLD are coming up in the 110 villages which are getting new water connections and Underground Drainage (UGD) lines.
'We are working towards completing these ongoing projects by December 2025. Many of the STPs in the 110 villages will be completed much before that as well,' said V. Ram Prasath Manohar, Chairman, BWSSB. 'Once these STPs are commissioned, our capacity to treat sewage will go up significantly. We are also investing in tertiary treatment of this water to ensure its use in the city for non-drinking purposes and filling lakes. This way we will conserve a lot of water,' he added.
However, there is not enough demand for treated water from the existing STPs itself. Sources said the demand for treated water has fallen compared to the summer of 2024, when there was a severe water crisis.
Gap in treatment capacity still remains
The city currently has infrastructure to draw up to 2,220 MLD water from the Cauvery river, of which around 1,800 MLD is being drawn. This is expected to go up as more new connections are given under the Cauvery V Stage. In addition, the usage of groundwateris tough to quantify, which means thateven with these 26 new STPs (adding to a total treatment capacity of 1,818.5 MLD), there will still be a big gap in the city's treatment capacity.
A survey taken up by the board after laying 1,538 km long UGD lines and building 14 STPs at a cost of ₹925 crore in 110 villages, shows that these areas still need over 400 km of UGD lines and 9 more STPs, which is estimated to cost around ₹850 crore. The board is expecting to take up these works under the World Bank's Karnataka Water Security and Resilience Programme, under which the international agency is giving a loan of ₹3,500 crore, and BWSSB is expected to get over ₹1,000 crore.
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