Why every drain is acting up at once
Every fixture in your house drains into branch lines that merge into one main sewer line running out to the street. A clog in a single fixture’s branch affects only that fixture. But when the main line blocks, wastewater from the whole house has nowhere to go, so it backs up into whatever sits lowest.
That’s why the classic symptoms are cross-fixture: the tub gurgles when the toilet flushes, the floor drain backs up when the washer drains, or a downstairs shower fills with water nobody ran. Water appearing at your outdoor cleanout is the same story, escaping at the first opening it finds.
What usually causes it
Tree roots are the most common culprit, they enter through pipe joints and cracks and net everything that passes. Grease buildup, “flushable” wipes, collapsed or bellied pipe sections, and foreign objects round out the list. The cause matters, because it determines whether clearing the line is a fix or just a reprieve.
What to do right now
The goal is simple: stop adding water to a line that has nowhere to send it.
Stop all water use
No flushing, no showers, and critically no laundry or dishwasher cycles, those discharge large volumes fast.
Check the lowest fixtures
If dirty water is rising in a tub or floor drain, treat it as sewage: keep people and pets away.
Call for main line clearing
This is a cable-machine or hydro-jetting job at the main, not a plunger job at any fixture.
If it’s happened before, get a camera
A recurring main line clog has a cause, roots, a belly, a break. A camera inspection shows it, with a recording and a located depth, so you can fix the cause instead of renting relief.
“Fixtures clog one at a time. When the whole house backs up, the house is telling you where the problem is.”
The bottom line
A main line backup is sewage-adjacent by definition, act fast, stop the water, and get the line cleared today. Then decide with a camera, not a guess, whether this was a one-off clog or the first symptom of a line that needs real work.