When several drains back up at the same time, the clog is almost always in a pipe they share, such as a branch line or the main sewer line leaving the home. A clog in one sink only affects that sink, so multiple backups point to something further down the system.
How Drain Lines Connect
Each fixture has its own small drain, but those drains join together into larger pipes. Eventually everything flows into one main line that carries waste to the city sewer. A blockage in that main line affects every fixture above it, often starting with the lowest drains.
Common Causes of Shared Line Clogs
Several things can block a main or branch line:
- Grease poured down the kitchen sink that hardens over time
- Wipes, paper towels, and hygiene products flushed down toilets
- Tree roots growing into older sewer pipes through small cracks
- Sagging or broken sections where waste collects
Clues That Point to the Main Line
Watch for water rising in a tub or shower when you flush a toilet. Gurgling sounds from drains you are not using are another sign. Backups that are worst in a basement or ground floor also suggest the main line.
What to Do in the Meantime
Stop running the dishwasher, washing machine, and showers. Every gallon has to go somewhere, and it may come up through the lowest drain. Do not keep plunging fixtures, which can push water out of other drains. In an apartment building, tell the super, since other units may be affected.
A shared line problem usually needs professional tools. Opening the shared line and checking why it clogged helps stop it from happening again. Backups like this are often a good reason to review the condition of your home’s drain system as a whole. Call JPR Plumbing at (833) 603-1840.