What You Should Never Put Down the Drain with a Septic System

A septic system relies on a delicate balance of bacteria to break down waste. Many everyday household items disrupt that balance — or cause physical blockages — that can lead to expensive repairs.

Never flush these items

"Flushable" wipes are not actually safe for septic systems. They don't break down in the tank the way toilet paper does. The same goes for feminine hygiene products, paper towels, dental floss, cotton swabs, and medications. These all cause blockages or harm the bacterial environment.

Avoid these down the kitchen sink

Cooking grease and oil should never go down the drain — they solidify in the tank and pipes, causing serious blockages. Coffee grounds, eggshells, and starchy or fibrous food scraps should be composted or thrown away rather than put through a garbage disposal.

Household chemicals to limit

Bleach, drain cleaners, antibacterial soaps in large quantities, and paint or solvents all kill the bacteria your tank needs. You don't have to eliminate these entirely, but minimize use and never dump large quantities at once.

The simple rule

If in doubt, throw it in the trash. Your septic system is designed for human waste and toilet paper. Everything else is a gamble.