Emergency Drain Backup: What to Do Right Now

If water or sewage is backing up into your home right now, read this page and follow the steps below. Then call (602) 858-7303 immediately. We answer 24 hours a day, 7 days a week, and dispatch emergency technicians across the entire Phoenix metro area. Average arrival time is 45 to 60 minutes.

Step 1: Stop Using All Water Immediately

This is the most important thing you can do right now. If your main sewer line is blocked, every drop of water you add to the system has nowhere to go — it backs up through the lowest drain in your home. That means:

Don't flush any toilets. Don't run any sinks. Don't start the dishwasher or washing machine. If the washing machine is mid-cycle, turn it off. If someone is in the shower, turn it off. Every gallon you add makes the backup worse and pushes more contaminated water into your living space.

The backup is usually coming from the lowest fixtures in your home — floor drains in the garage, laundry room, or basement (if you have one), or ground-floor showers and bathtub drains. These are the first places sewage will appear because gravity brings it to the lowest point it can reach when the main line is blocked.

Step 2: Find and Turn Off Your Main Water Shutoff

The main water shutoff valve stops all water from entering your home. In most Phoenix homes, it's in one of three locations:

Front of the house near the hose bib. Look for a round or oval valve handle near the front exterior wall, typically close to where the garden hose connects. Turn it clockwise until it stops.

In the garage. Some Phoenix homes, especially those built in the 1990s and later, have the main shutoff in the garage, usually on the wall closest to the street. Look for a brass or red-handled valve on a pipe coming through the wall or floor.

Near the water meter at the street. If you can't find the shutoff at the house, the city water meter is at the property line near the street, in a concrete or plastic box at ground level. The homeowner shutoff valve is on the house side of the meter. You may need a meter key (a T-shaped tool) to access it, but in an emergency, a pair of pliers works on most valve types.

Turning off the main water shutoff prevents any new water from entering your plumbing system. This buys you time and prevents the backup from getting worse while you wait for our emergency technician to arrive.

Step 3: Do NOT Use Chemical Drain Cleaners

This is critical. During an active backup, pouring chemical drain cleaners (Drano, Liquid-Plumr, sulfuric acid solutions, or anything similar) down the drain will not help and creates serious problems:

If the main line is blocked, the chemicals sit in the pipe and don't reach the clog. They mix with the standing wastewater and create a toxic chemical hazard in your home. When our technician arrives and opens the cleanout or accesses the line, they're now working with caustic chemicals in an already-contaminated environment. Chemical drain cleaners also react dangerously with other household chemicals that may be in the wastewater — chlorine bleach plus drain cleaner, for example, produces chlorine gas.

We've responded to emergency calls where homeowners poured multiple bottles of drain cleaner into an actively backing-up system. The chemicals made the situation significantly more dangerous for everyone — the homeowners, our technicians, and anyone in the house. Please don't do this.

Step 4: Check if Multiple Drains Are Affected

This helps us diagnose the problem before we even arrive. Carefully check — without running any water — whether the backup is coming from one drain or multiple drains:

One drain backing up: The blockage is likely in that fixture's branch line or P-trap. This is usually less severe and can be cleared from the fixture itself. It's still an emergency if it's your only toilet or if water is overflowing onto the floor.

Multiple drains backing up or slow simultaneously: This almost certainly means your main sewer line is blocked. Every fixture in the house drains into the main line, so a blockage there affects everything. This is the more serious scenario and requires main-line equipment to clear.

Water comes up in one fixture when you use another: For example, flushing a toilet causes water to rise in the bathtub. This is a definitive sign of a main sewer line blockage. The flush water can't exit through the main line, so it backs up through the next available opening.

Tell us what you're seeing when you call (602) 858-7303 — it helps us dispatch the right equipment and gives the technician a head start on diagnosis.

Step 5: Protect Your Home and Family

While you wait for our technician (typically 45 to 60 minutes in the Phoenix metro):

Keep children and pets away from the affected area. Sewer backup water contains harmful bacteria including E. coli, salmonella, hepatitis A, and other pathogens. It's not just dirty water — it's a genuine health hazard. Don't let anyone walk through it barefoot or touch it with bare hands.

Wear shoes and gloves if you must enter the area. Rubber boots or waterproof shoes and rubber gloves. If you have a disposable N95 mask, wear it — sewer gas contains hydrogen sulfide, which is an irritant at low concentrations and a health risk at higher concentrations.

Open windows for ventilation. Sewer gas is heavier than air and accumulates at floor level. Open windows and exterior doors in the affected area to ventilate. If you have a box fan, point it toward an open window to push contaminated air out.

Move valuables out of the path of water. If the backup is spreading, move furniture, rugs, electronics, and anything you don't want contaminated. Sewer water ruins fabric, damages wood, and corrodes electronics. The faster you move things, the less you lose.

Don't try to clean up the water yet. Proper sewage cleanup requires specific procedures and often professional restoration services. The priority right now is stopping the backup (which means clearing the blockage) — cleanup comes after. If you try to mop up or shop-vac while the backup is active, more water will just replace what you remove.

Step 6: Check Your Cleanout (If You Can Find It)

Most Phoenix homes have a sewer cleanout — a 4-inch capped pipe that provides direct access to the main sewer line. It's typically located in one of these places:

In the front yard near the foundation. In the backyard near the kitchen wall. In the garage floor. Near the property line toward the street.

If you can find your cleanout and safely access it, you can try removing the cap. Sometimes this relieves pressure in the system by giving the backed-up water an alternative exit point — it flows out of the cleanout rather than backing up into the house. Be prepared: opening the cleanout may release a surge of water. Have towels or a bucket nearby, or stand to the side.

Important: do not attempt to clear the line yourself through the cleanout. A main sewer line blockage requires a professional cable machine or hydro jetter. Attempting to clear it with a garden hose, a hardware store snake, or any other makeshift tool is unlikely to work and may push the blockage further into the line or damage the pipe.

Health Hazards of Sewage Backups

A sewer backup is not just a plumbing problem — it's a health hazard. Sewer water (classified as Category 3 or "black water" by the Institute of Inspection, Cleaning and Restoration Certification) contains:

Bacteria: E. coli, salmonella, campylobacter, shigella, and other pathogens that cause gastrointestinal illness, skin infections, and respiratory problems. Exposure can happen through direct contact, inhalation of contaminated air, or contact with surfaces that sewage has touched.

Viruses: Hepatitis A, norovirus, rotavirus, and adenoviruses. These can survive on contaminated surfaces for days and are infectious at very low doses.

Parasites: Giardia and cryptosporidium, both of which cause severe gastrointestinal illness and can be present in municipal sewage.

Hydrogen sulfide gas: The "rotten egg" smell associated with sewage. At low concentrations, it's an irritant to eyes and respiratory tract. At high concentrations (possible in enclosed spaces with significant backup), it can cause dizziness, nausea, and in extreme cases, loss of consciousness. This is why ventilation is important.

Any porous material that sewer water has contacted — carpet, padding, drywall, insulation, upholstered furniture, mattresses — is considered contaminated and typically needs professional cleaning or replacement. Non-porous surfaces (tile, concrete, finished wood) can be disinfected. After our technician clears the blockage, we can recommend restoration companies in the Phoenix area that specialize in sewage damage cleanup.

What Causes Emergency Backups in Phoenix

The most common causes of emergency drain backups in the Phoenix metro area are:

Tree root intrusion. Roots from mesquite, palo verde, ficus, and olive trees grow into the main sewer line through deteriorated pipe joints. Once the root mass fills enough of the pipe, a heavy-use event (holiday cooking, laundry day, a house full of guests) pushes more water through the line than the restricted opening can handle, and the backup occurs. Root backups are most common in established neighborhoods — Arcadia, Encanto, Coronado, Willo, Scottsdale — where mature trees and older clay pipes coexist.

Collapsed or offset pipe. Clay and cast-iron sewer pipes in Phoenix homes built before 1980 are past their intended service life. Soil movement, root pressure, and decades of corrosion can cause sections to crack, collapse, or shift out of alignment. When this happens, the pipe can't carry water and the backup is sudden and complete. A camera inspection after clearing the immediate blockage reveals the structural failure.

Heavy grease buildup. Kitchen grease accumulates in the main sewer line over years, combining with hard water mineral deposits. During a high-use event — Thanksgiving dinner is the classic example — the accumulated grease finally blocks the pipe completely. Grease backups are among the most common calls we get on holidays.

Monsoon storm infiltration. During heavy monsoon storms (July through September), storm water enters the sewer system through cracked pipes, damaged cleanout caps, and groundwater infiltration. The surge can overwhelm a main line that was already partially restricted by roots, scale, or grease, triggering a backup even though the homeowner hasn't changed their water use.

Call Now

If you're dealing with an active drain backup, you've read enough. Call (602) 858-7303 right now. A live person will answer, we'll ask a few quick questions about what's happening, and we'll dispatch the nearest available emergency technician to your home. We're available 24 hours a day, 7 days a week, across the entire Phoenix metro area.