Applied for CTE to build STP on Spurtank Road: CMWSSB The Chennai Metro Water Supply and Sewerage Board (CMWSSB) says it has applied for CTE (Consent to Establish) for its modular sewage treatment plant (STP) on Spurtank Road. Share Via Email | A+A A- By Express News Service CHENNAI: The Chennai Metro Water Supply and Sewerage Board (CMWSSB) says it has applied for CTE (Consent to Establish) for its modular sewage treatment plant (STP) on Spurtank Road. Responding to an article titled ‘Cleanup drive to cause more pollution in Cooum river’, the board stated, “From 2019, the application has been under scrutiny at TNPCB and the same queries were raised by all officials due to discontinuity.”