Where Is Your Main Sewer Cleanout? Homeowner Guide

If you’ve ever wondered, “Where is the main sewer cleanout?”—you’re not alone. Most homeowners only search for it after a slow drain, gurgling sounds, or a full backup. Knowing where the cleanout is before a problem starts can speed up repairs and reduce damage to floors, walls, and landscaping.

A main sewer cleanout is an access point that lets plumbers insert a drain snake or mechanical auger into the main line. Depending on your home’s plumbing layout and local building practices, it’s often near where your house connects to the sewer, either inside or outside the building.