The Maharashtra Pollution Control Board has sent a show-cause notice to the Kalyan-Dombivli, Ulhasnagar, Ambernath and Badlapur municipal corporations on Tuesday for not following the Supreme Court's instructions on sewage treatment plants (STP). The SC has ordered municipal corporations to get the sewage treated before it is discharged into rivers. These corporations have allegedly been discharging chemicals and untreated sewage into the rivers directly, polluting them. The MPCB has asked them to state the reasons for not following the instructions or they will take strict action.

The principal secretary, environment department had directed that a committee be formed to verify the compliance of these corporations. The committee visited several locations under these corporations and found many issues.