To eliminate drain flies, clean drains thoroughly by removing organic build-up, and use enzyme-based cleaners or boiling water to kill larvae. Fixing leaks and maintaining clean drains will prevent them.

Drain flies thrive in drains with organic matter buildup. Cleaning your drains with enzyme-based products or pouring boiling water down the drains will help kill larvae and eliminate breeding grounds. Fixing leaky pipes and maintaining clean, dry areas around drains will prevent future infestations. For severe problems, professional drain cleaning services may be necessary.