The first hours, in order

Right away
Stop using all water: toilets, sinks, showers, dishwasher and washing machine. Tell everyone in the house.
First 10 minutes
If any supply line is leaking or a fixture is still filling, close the main water shutoff near where the line enters the house.
First 15 minutes
Move rugs, furniture and stored items away from the affected drain. Shut off power to outlets near standing water only if you can reach the panel safely and dry.
First 30 minutes
Photograph the backup, the affected fixtures, any wet flooring and the outdoor cleanout area.
First hour
Contact a licensed plumber to clear the line, and call your insurance carrier to ask how they want the damage documented.
After the line is clear
Ask for a camera inspection to find out why it backed up, and plan cleanup of contaminated materials.

Why the lowest fixture floods

Water in a blocked drain system rises until it finds the lowest opening. In a single-story slab home, that is usually a shower or tub on the side of the house nearest the lateral. Flushing an upstairs toilet or running a load of laundry can push more wastewater out of that opening within seconds.

This is why the most important thing a household can do is stop all water use until the line is cleared. Even a quick hand wash adds to the problem.

Do and don't

  • Do keep the bathroom door closed and ventilate with a window if possible
  • Do keep receipts for any cleanup supplies or emergency services
  • Don't pour chemical drain cleaner into a backed-up drain
  • Don't open a pressurized cleanout cap yourself
  • Don't run a wet-vac on sewage unless you can disinfect it afterward
  • Don't let anyone wade through sewage barefoot

Example: Saturday laundry backup

Illustrative example. Not a real job or customer.

In a slab-on-grade house, the washer drains and gray water rises in the hall shower, followed by a sewage smell.

  1. The household stops all water use and closes the bathroom.
  2. They photograph the shower and the outdoor cleanout area.
  3. A plumber clears the lateral from the cleanout and pulls out roots.
  4. The plumber runs a camera and finds roots entering at several joints near a front-yard tree.

The line flows again that day, and the household has footage to compare repair options rather than relying on repeated clearing.

Common questions

Can I use the toilet if I only flush once?

No. Any water added while the lateral is blocked goes back up into the house. Wait until the line has been cleared.

Who cleans up after a sewer backup?

Small gray-water spills can often be cleaned by the household. Larger sewage spills, or anything soaking into drywall or carpet, are often handled by water damage restoration specialists. Ask your insurer first.

Should I get a camera inspection after it is cleared?

Yes, especially if it is not the first backup. Clearing restores flow but does not show why the line failed.

General information for Whittier, not a quote or professional advice. In an emergency, call 911.