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At present there are six sewage treatment plants-
1) Vrishabhavathi valley on Mysore Road
2) Koramangala Chellaghatta valley .
3) Hebbal STP.
4) Yelahanka water treatment plant at yelahanka
5) At Madivala
6) At Kempambudhi Lake

The Original treatment capacity of Vrishabhavathi plant 123 MLD. until now the plant was treating the sewage to secondary standards only. This plant comprises two clarifiers, four digesters and twenty sludge drain beds. A laboratory is also attached to this treatment plant to test the effluents. The plant is expanded to 180 MLD capacity and is also upgraded to treat the sewage to secondary standards. The treatment process is trickling filter s.

The existing capacity of the Koramangala and Chellaghatta valley sewage treatment plant is 163 MLD. The plant has been upgraded to treat the sewage to the secondary standards by activated sludge process. The plant consists of three primary clarifiers, three secondary clarifiers and four numbers of digestors and forty numbers of sludge drying beds. A lab is also attached.

It is normally anticipated that 80% of water supplied is likely to flow back in the form of sewage into the sewerage system.

Million Litres per day

Sl No	Particulars	Existing Level	Standard Level
1.	Water supply	860	679
2.	Sewerage flow @ 80% of the water supply	438	543
3.	Treatment capacity of the primary sewage plant	408	543

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