Sewage Backup in Your Home: What Arizona Homeowners Should Do

By Noah Miller, founder of AZ Water Damage Help · Published October 16, 2026

Few things are worse than dirty water coming up through a tub or floor drain. A sewage backup is not just a mess. It is a health hazard that can spread bacteria through your home. This guide covers the warning signs, the first steps to take and what proper cleanup looks like in Arizona.

What are the warning signs of a sewer backup?

A main sewer line usually gives warnings before it backs up. The key sign is several drains acting up at once, especially the lowest drains in the house. One slow sink is often a local clog. Many slow drains point to the main line.

• Dirty water rising from a floor drain, tub or shower
• Gurgling toilets or drains
• Sewer smell inside the home
• Several drains clogging at once
• Water coming up when you run the washer or dishwasher
• Water or wet soil around the sewer cleanout in the yard

What should you do first when sewage backs up?

Stop adding water to the system, protect people and pets, and get help. Every flush, shower or load of laundry pushes more sewage into your home until the blockage is cleared.

1. Stop using water. Do not use sinks, toilets, the washer or the dishwasher.
2. Keep people out. Keep children, pets and anyone with a weak immune system away from the area.
3. Protect yourself. Do not touch sewage without gloves and boots. Wash your hands well after any contact.
4. Cut power if safe. Turn off power to wet areas at the breaker only if you can reach it without stepping in water.
5. Air it out. Open windows if the weather allows, and close doors to the rest of the house.
6. Take photos. Document the water, the drains it came from and damaged items for your insurer.
7. Make two calls. Call a plumber for the blockage and a cleanup crew for the damage.

What should you NOT do after a sewage backup?

Some common reactions make a sewage backup worse or less safe. Avoid these until a professional has looked at the damage.

• Do not pour chemical drain cleaner into a backed-up line.
• Do not mix bleach with other cleaners. Some mixes create toxic fumes.
• Do not use a household vacuum or shop vac on sewage. It can spread germs into the air.
• Do not run the HVAC fan if the air handler is near the affected area.
• Do not try to dry soaked carpet or drywall and keep it. These items usually must be removed.
• Do not throw out damaged items before your adjuster sees them or you have photos.

Why does sewage need professional cleanup?

Under the IICRC S500 standard, sewage is Category 3 (black) water. It contains bacteria and viruses. Carpet, pad and drywall it soaks usually must be removed. Hard floors and framing are cleaned with disinfectants, dried and checked. Proper cleanup protects your family and supports your insurance claim.

Here is what a professional sewage backup cleanup usually includes:

Steps in professional sewage backup cleanup

Step	What happens
Protect and contain	Crew wears protective gear and closes off the area
Extract	Sewage water is pumped and extracted
Remove	Porous materials it touched, like carpet, pad and lower drywall, are removed and disposed of safely
Clean and disinfect	Hard floors, framing and surfaces are cleaned and disinfected
Dry	Air movers and dehumidifiers dry the structure, with moisture readings
Odor control	Remaining odor is treated before rebuilding

Can you clean up a small sewage spill yourself?

A very small toilet overflow on tile can be cleaned with gloves and disinfectant. Anything that soaks carpet, drywall or spreads across rooms should be handled by professionals. If you are unsure, it is safer to have it checked than to leave contamination behind walls or under flooring.

What causes sewer backups in Arizona homes?

Most backups come from a blockage in the main line. Grease poured down the kitchen drain hardens in the pipe. So-called flushable wipes, paper towels and feminine products do not break down. Tree and shrub roots can push into older sewer lines looking for water, which is common in a dry climate.

Heavy monsoon storms can also overload drains and sewer systems for a short time. Our monsoon water damage checklist covers how to prepare. Some homes in rural parts of Pinal and Pima County use septic systems, which can back up when the tank is full or the drain field fails.

How to lower your risk

• Keep grease, wipes and paper towels out of drains and toilets.
• Know where your outdoor sewer cleanout is.
• Have a plumber camera-inspect an older sewer line, especially with large trees nearby.
• Pump a septic tank on the schedule your septic pro recommends.
• Ask your plumber whether a backwater valve makes sense for your home.

Does insurance cover sewage backup in Arizona?

Many Arizona homeowners policies exclude sewer backup unless you added a sewer or water backup endorsement. Check your policy for that rider now, before you need it. If you have it, document the damage, call your insurer quickly and keep every receipt. Read does Arizona homeowners insurance cover water damage for more.

Sewage cleanup usually costs about $3,000 to $10,000 or more because of the extra safety work. See our water damage restoration cost guide for all the ranges.

We handle sewage cleanup in Coolidge, Eloy, Arizona City, Casa Grande and across our Arizona service areas.

Frequently asked questions

Sources

• IICRC (Institute of Inspection, Cleaning and Restoration Certification)
• EPA: Mold
• Arizona Department of Insurance and Financial Institutions

Related guides

• Burst Pipe in Your Arizona Home? What to Do in the First Hour
• How Much Does Water Damage Restoration Cost in Arizona? (2026)
• How Fast Does Mold Grow After Water Damage in Arizona?
• Monsoon Water Damage Checklist for Arizona Homeowners

Water damage services

• Sewage backup cleanup
• Emergency water removal
• Mold after water damage
• Insurance claim help