Thirty-seven small STPs are needed along the Mithi. File pics

The state Comptroller and Auditor General (CAG) has slammed the BMC for not setting up sewage treatment plants along the Mithi river yet, leading to extreme pollution. The report tabled in the monsoon session cited a June 2006 IIT-B report that had suggested construction of 37 small STPs along with river to stop entry of untreated sewage.