Main Sewer Line Backing Up at an Office, Store or Commercial Building

It starts small: a toilet that drains slowly, a floor drain that gurgles, a sink that backs up when someone flushes. Then several fixtures in the building overflow at once, usually the lowest ones first. Staff are sent home or the restrooms are closed, and the question is how fast the line can be cleared.

When more than one fixture is affected, the blockage is almost never in a fixture. It's in the main building sewer, the pipe that carries everything out to the city main or the property line. Common causes are paper and wipes, grease, scale, roots and a damaged or sagging section of pipe.

We locate the cleanout, the access point that lets us reach the main without opening a fixture. We cable or jet from there and see what comes back. A clean flush of water after clearing tells us the line is open.

Then we camera the line. That's the step that separates a one-time stoppage from a recurring one. On camera we can see roots coming through a joint, a section that has dropped and holds water, a break, or buildup along the pipe wall, and we can show you the footage. If a problem keeps coming back, the camera is how you find out why instead of paying for the same clearing repeatedly.

If there's no accessible cleanout, we tell you. Adding one is often part of the fix.

First we stop the symptom: cable or hydro-jet the line so the building is working again. For heavy buildup, jetting cleans the pipe wall and not just a hole through the blockage.

If the camera shows damage, we write a proposal with what we saw and the options, which could be spot repair, replacing a section, or scheduled cleaning if the line is sound but prone to buildup. Larger repairs need your written approval before work starts, and your work order's not-to-exceed limit stays in force. Digging near a public main or in the right of way can involve permits and utility marking, and we'll tell you what applies.

Tell dispatch which fixtures are affected, which ones back up first and whether sewage is on the floor. Keep people out of any area with sewage, and don't run water or flush while the line is blocked, because it all ends up on the floor.

Know where your cleanouts are, and if you've had a camera inspection or a past stoppage, tell us. Ask your landlord or property manager who owns the line between the building and the main, because that decides who approves the repair. The ownership boundary differs by city, and the code page linked here shows how.

If more than one fixture in your house backs up, or a tub gurgles when the toilet flushes, it's the main line and a camera job. Stop using water and call.