What to Do Immediately After a Burst Pipe

If a pipe bursts, you must shut off the main water valve immediately, open all faucets to drain the pressurized lines, isolate your water heater if necessary, and call for professional extraction. These steps stop the flooding at the source and reduce the volume of water forced into your structure by Phoenix's high municipal water pressure.

Step 1: Shut Off the Main Water Valve

Locate and close your main shutoff valve immediately to stop the flow of water into your home. In Phoenix, this is usually found in a concrete box near the street or on the side of your house where the main service line enters. Turn the valve clockwise until it stops (gate valve) or perpendicular to the pipe (ball valve).

For full guidance on finding your valve and what to do if it's stuck, see our complete guide to water shutoff. Do not waste time looking for a local shutoff behind a sink or toilet if the main line or a wall pipe has failed; go straight to the main supply.

Step 2: Drain the Water Still in Your Pipes

Water remains in your pipes under significant pressure even after the main valve is closed. If you do not drain the system, this residual water will continue to spray or leak out of the burst point until the entire home's plumbing is empty.

To relieve this pressure, open every faucet in the house—both hot and cold—and flush all toilets several times. Start with the faucets at the lowest point of the property (like an outdoor spigot) to allow gravity to assist in draining the upper floors. This clears the pressurized column of water, stopping the leak at the burst point much faster than if the lines remained closed.

Step 3: If the Burst Pipe Is on the Hot Water Line

If the failure is on a hot water pipe, you have an additional 40 to 50 gallons of water stored in your water heater that could potentially leak into your home. You must shut off the water heater and open the hot-water taps to drain the tank.

Turn off the power at the breaker panel (for electric heaters) or turn the gas control valve to "Off" or "Pilot" (for gas heaters). Then, close the cold-water inlet valve located on top of the heater. By draining the hot water lines through your faucets, you prevent the tank from emptying itself through the burst pipe, and you protect the heating elements from burning out once the water level drops.

Step 4: Cut Power to the Affected Area if It's Safe

Water and electricity are a fatal combination. If water is pooling near outlets, running down inside walls containing wiring, or reaching appliances, you must shut off the electricity to those specific zones at the main breaker panel.

Safety Warning: Only attempt to operate the breaker panel with completely dry hands while standing on dry footing. Never enter standing water that may be in contact with electrical sources. If the water has reached the panel or you cannot reach it safely, evacuate the home and wait for the fire department or a professional restoration crew.

Step 5: Temporarily Slow the Leak (Don't Try to Fix It)

Once the pressure has been relieved and the flow has slowed to a drip, you can attempt to manage the remaining leakage. Wrap the damaged section of pipe tightly with rags, use heavy-duty waterproof tape, or apply a pipe repair clamp if one is available in your emergency kit.

State clearly: this is a temporary measure to reduce further water damage until a licensed plumber and restoration professional arrive. Do not attempt to cut into the plumbing or perform a permanent repair yourself. Improper repairs can lead to secondary failures, and many insurance carriers require professional documentation of the original failure point to process a claim.

Step 6: Extract Standing Water and Protect Belongings

If it is safe to do so, move furniture, electronics, and valuables out of the affected area. Begin removing standing water using a wet/dry shop vacuum or by mopping if the area is small. Every minute that water sits in contact with your flooring, baseboards, and drywall increases the risk of permanent structural damage and microbial growth.

For the complete first-hours checklist, including how to document the damage for your records and how to work with your provider, see our First 24 Hours Guide. Do not delay the extraction process; clean water from a pipe burst can degrade into a hazardous "Category 2" source in as little as 24-48 hours in the Arizona heat.

Why Do Pipes Burst? (It's Usually Not Freezing in Phoenix)

Freezing temperatures are the leading cause of burst pipes across the United States, but freezing is rarely the cause of burst pipes in Phoenix. While we do see occasional overnight frosts, the pipes in our region are generally buried or insulated enough to withstand them. The real culprits in the Valley are much more consistent and aggressive.

Extreme Water Pressure: Phoenix municipal water pressure is notoriously high. While residential plumbing is designed for a maximum of 80 PSI, street pressure in many parts of the Phoenix metro area—including Scottsdale, Mesa, and Glendale—commonly reaches 90 to 120 PSI or higher. Phoenix city code requires a Pressure Reducing Valve (PRV) for this reason, but these valves eventually fail. When they do, the constant high-pressure stress on pipe joints, valves, and appliance hoses leads to sudden, violent bursts.

Hard-Water Mineral Corrosion: Arizona's water is among the hardest in the nation. Over time, calcium and magnesium deposits build up inside your pipes, causing "pitting" corrosion. This eats through copper and galvanized steel from the inside out, weakening the pipe walls until they can no longer hold the pressure.

Thermal Expansion: The extreme heat of the Arizona summer causes both the ground and the pipes themselves to expand and contract. In older homes with aging plumbing, this physical stress eventually causes joints to pull apart or brittle sections of pipe to crack.

If you are dealing with a failure in a specific city, visit our Phoenix service page or Mesa service page for local response details.

Is a Burst Pipe Covered by Homeowners Insurance?

Sudden and accidental pipe bursts are typically covered by standard homeowners insurance policies. The policy usually covers the cost of water extraction, structural drying, and the repair of damaged materials like drywall and flooring.

However, coverage typically excludes damage resulting from long-term, unaddressed maintenance issues. If a pipe has been leaking slowly for months due to known corrosion and you failed to fix it, the carrier may deny the claim. For more details on budgeting for these emergencies, see our Arizona Water Damage Cost Guide.

How to Help Prevent a Burst Pipe in the Future

Preventing a future emergency in the desert requires proactive plumbing management. We recommend:

• Pressure Testing: Have a plumber test your home's static water pressure. If it's over 75 PSI, ensure your Pressure Reducing Valve (PRV) is functioning correctly. PRVs typically last 7-10 years.
• Water Softening: Install a high-quality water softener to reduce the mineral scale that causes internal pipe corrosion.
• Pipe Evaluation: If your home was built before 1990, have your galvanized or steel plumbing inspected for signs of external corrosion or internal narrowing.

Key Takeaways

• Act Immediately: A burst pipe is a high-volume emergency that requires instant source control to prevent structural failure.
• Limit Damage: Shutting off the main water valve and draining the lines yourself can significantly reduce the total volume of water lost.
• Phoenix High Pressure: Local municipal pressure (90-120+ PSI) makes bursts more destructive than standard leaks; professional extraction is mandatory.
• Prevent Mold: Call for professional moisture removal within the first few hours to ensure water is extracted from wall cavities and subfloors.