For this matter, I would like to advise you to please go through the Consent to Operate issued by MPCB to your company, where it must be clearly defined what kind of wastes are allowed from your company. If your company is producing any wastewater that may be hazardous as per environmental laws, MPCB or PCMC will definitely object to draining it out other than through standard methods. According to the norms set by MPCB, it has to be properly disposed of or recycled by in-house wastewater treatment facilities like ETP/STP. It would not be permissible to drain out through local drainage systems.
I would like to advise you to please go through the details of your permissions/consents by such authorities and try to make the necessary arrangements for its drainage. Nowadays, MPCB or such competent authorities are stricter in enforcing environmental laws. Hence, take proper steps for wastewater disposal in consultation with your management.
I hope this will help you...
Regards,