What the City of Los Angeles says about drains
LA Sanitation tells residents never to pour cooking grease down a sink or garbage disposal, because it solidifies inside pipes. Instead, it says, scrape food leftovers into the trash and pour cooled grease into a sealed container in the black trash bin.
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LA Sanitation also explains what poured grease does: fats, oils and grease that go down household drains cool, solidify and stick to the inside walls of sewer pipes, and over time the buildup restricts wastewater flow until it causes sewer overflows in homes.
The Los Angeles Department of Water and Power (LADWP) says a rotten-egg or sewage smell at the sink is usually sewer gas formed by bacteria in the household drain, not an odor in the water. Those bacteria, it says, live on food, soap, hair and other organic matter in the drain.
For rental properties, the Los Angeles Housing Department tells owners to make sure the property does not have defective drainage, plumbing leaks, or damaged or inoperable plumbing fixtures.

