When several drains back up at once, the clog is usually in the main drain or sewer line, not in a single fixture. That line carries water from every sink, tub, and toilet out of the home, so a blockage there affects them all.
How Your Drains Connect
Each fixture has its own small drain pipe. Those pipes join larger lines, which lead to the main line and then to the city sewer. A clog in a small pipe affects one fixture. A clog in the main line affects everything that drains into it.
Common Causes of Main Line Clogs
Grease, wipes, and paper towels can build up in the main line over time. Tree roots can grow into older sewer pipes through small cracks. Pipes can also sag or shift, which lets waste collect in low spots. During very heavy rain, city sewers can fill up, and that can push water back toward homes.
Signs to Watch For
The lowest drains in the home usually show problems first. That might be a basement floor drain or a ground-floor shower. You may notice water in the tub after flushing, or gurgling in a sink when the washing machine drains.
What to Do Now
Stop using water as much as you can. Do not keep flushing or running the washer. Chemical drain cleaners rarely reach a main line clog and can make the cleanup harder. If you see a cleanout cap, do not open it yourself when the line is full, since waste can spill out.
A plumber can clear the main line and may use a camera to look inside the pipe. That can show whether the clog came from buildup, roots, or a damaged section. We cover how a blocked main line gets cleared in more detail.
If multiple drains are backing up in your home, call JPR Plumbing at (833) 603-1840. Once the main line is clear, a review of the drains on every floor can confirm nothing else is slowing down.