Several drains back up at once when there is a clog in a pipe they share, usually the main sewer line or a branch line serving one part of the home. Grease, wipes and paper products, tree roots, sagging or damaged pipes, and storms that overload city sewers are the common causes.
Find the Pattern
Walk around and note which drains are affected. A bathroom where the sink and tub are both slow suggests a clog in that bathroom’s branch line. If a basement floor drain or ground floor shower fills up when someone flushes upstairs, the main line is the likely culprit. Gurgling and sewer smells are additional clues.
What Clogs Shared Lines
Most main line clogs build slowly. Grease from cooking cools and sticks to the pipe. Wipes and paper towels catch on it and pile up. In older homes, roots can push through small cracks, and pipes that have settled develop low spots where debris collects. Very heavy rain can also slow drainage into city sewers.
Multi-Family Homes
In buildings with several units, drains feed into shared stacks. If neighbors are dealing with the same thing, let the landlord or management know so the right section can be cleared.
What to Avoid While You Wait
Hold off on the washing machine and dishwasher, which send a lot of water down at once. Avoid plunging over and over, which can push water up through another drain. Skip chemical cleaners, which rarely reach a main line clog and make the water hazardous to handle.
Watch the lowest drain in the home. If it starts to fill, stop using water entirely.
A shared line clog needs professional equipment. The shared drain can be snaked open, and a camera can show why it happened. Afterward, better drain habits around the house can help prevent a repeat. Call JPR Plumbing at (833) 603-1840.