What is NOT ok to put in the sewer system?
It is illegal to pour any hazardous chemicals into the sewer system. Proper disposal of such chemicals should be dealt with according the laws of the Sanitation Division. It is not illegal for residents, but not recommended that you flush greases down your drains as this can cause blockages in your private sewer system and in the sewer main. Commercial properties in the food industry have to install grease traps in order to prevent grease problems in the main.
