Stormwater Pollution Prevention Help keep pollutants such as trash, pet waste, pesticides, and motor oil out of our storm drains, which flow to our sewer system and our bay and ocean. Used Cooking Oil Disposal Never pour your oil down a drain. Reuse it or place in green compost bin. What Not to Flush The only things that should be flushed down a toilet are the three Ps: poop, paper (toilet paper, that is), and pee. Pretreatment Program If you are concerned with preventing pollution from your business or construction site, visit Pretreatment for permitting options and other needs. Get a Free Calendar Every year we offer a new calendar filled with pollution prevention, conservation and sustainability tips.