What to Do When Your Pipe Bursts at 2am

You wake up to the sound of running water and step into a puddle. A pipe has burst. Acting quickly limits the damage, so work through these steps in order.

Step 1: Shut Off the Water at Your House Valve

Stopping the water comes first. The Red Cross says to turn off the water at the main valve when pipes are damaged, then call a plumber.

In many Southern California homes, the house valve is outside. LADWP says it is usually near the front hose faucet (or the outdoor faucet closest to your water meter), in line with the meter. It can also be at the side or back of the house, or in the garage (Western Municipal Water District).

• Round wheel (gate valve): turn it clockwise until it stops. Do not force it.
• Straight lever (ball valve): turn it a quarter turn so the lever sits across the pipe instead of along it (SFPUC).

Do not turn the utility's valve in the street-side meter box unless your water provider allows it. Some providers let only their own staff operate it (Trabuco Canyon Water District rules). If you cannot find or close your house valve, call your water provider's emergency number, which is on your bill. LADWP's is 1-800-DIAL-DWP (1-800-342-5397), and LADWP says it takes emergency calls around the clock.

In a condo or apartment, ask your HOA or building manager where your valve is before you need it. For more detail, see how to shut off your home's main water valve.

Step 2: Keep Away From Water Near Electricity

Water that reaches outlets, cords, appliances, or the electrical panel can cause a dangerous shock.

• Stay out of standing water that may be touching outlets, cords, or appliances until the power is confirmed off (ESFI).
• Only switch off breakers if you can reach the panel with dry hands while standing on a dry floor, without walking through water (ESFI, Red Cross).
• If you cannot reach the panel safely, stay out and call your electric utility or a qualified electrician.
• Do not touch wet outlets, switches, or light fixtures, and stay out from under a ceiling that is sagging with water, a hazard the Red Cross warns about.
• Have an electrician check anything electrical that got wet before you use it again.

Step 3: Drain the Water Left in the Pipes

Closing the valve stops new water, but the pipes are still full. Open the hot and cold sides of a faucet at the lowest point in the house, such as a ground-floor tub, so the remaining water drains there instead of out of the break.

Step 4: Contain the Water and Start Drying

Use towels and buckets to soak up water and keep it from spreading toward carpet, wood floors, and other rooms. Move furniture and belongings out of the wet area.

A wet/dry vacuum helps, but only if you can run it without standing in water and plug it into a GFCI outlet (the kind with test and reset buttons), which ESFI recommends wherever water and electricity can meet. Then start drying: the EPA says to dry water-damaged areas and items within 24 to 48 hours to help prevent mold.

Step 5: Document Everything for Insurance

Before you clean up too much, take photos and video of the broken pipe, wet floors, water lines on walls, stained ceilings, and damaged belongings.

The California Department of Insurance advises reporting water damage to your insurer right away and taking reasonable steps to prevent more damage, since a policy may not cover damage you could have stopped. Save receipts for anything you buy to protect the home, hold off on major permanent repairs until the adjuster has seen the damage, and keep damaged items until the adjuster says you can discard them.

Step 6: Call a Licensed Plumber

Once the water is off and the area is safe, call a licensed plumber. Tell them where the break is, what the pipe looks like (copper, gray metal, or plastic), that the water is off, and whether water reached outlets, the panel, or a ceiling. Night and weekend visits usually cost more.

What Burst Pipe Repairs Typically Cost

These are typical estimated ranges for licensed plumbers in LA and Orange County, not quotes. Your price depends on where the break is and how hard it is to reach.

Work	Typical estimated range
After-hours or weekend service call to assess the problem	$100 to $250
Spot repair of a single damaged pipe section (1 to 3 feet)	$200 to $600
Leaking pipe section behind a wall or under a cabinet	$250 to $650
Major emergency repair, such as a burst pipe	$500 to $1,500
Slab leak repair (reaching a pipe under the concrete slab)	$1,500 to $4,000
Rerouting the line around the slab through walls or attic	$2,500 to $5,500

After-hours and weekend calls typically add about $75 to $150. Drywall, flooring, and ceiling repairs are separate from the plumbing work. See pricing, or slab leak repair if the break is under the slab.

Why Pipes Burst in Southern California

Burst pipes are not only a cold-weather problem. Two causes worth knowing:

Aging galvanized steel pipe. Older homes may still have galvanized steel supply lines, which rust from the inside. LADWP says galvanized pipe typically lasts about 20 years before rust shows up, and well-made pipe about 40. Rusty water from your own plumbing can mean the pipes are corroding and may eventually leak. High water pressure. Excess pressure strains joints, valves, and fixtures. Section 608.2 of the California Plumbing Code requires a pressure regulator when static water pressure is above 80 psi. If yours has never been tested, or your regulator is old, ask a plumber to check it.

Prevention Tips

1. Know your pipe material. Per the EPA, new copper looks like a penny, galvanized steel is gray (darker with age) and a magnet sticks to it, and PEX plastic tubing can be red, blue, white, or black.
2. Plan a repipe if you have old galvanized pipe and expect to stay in the home. The repiping cost guide covers typical ranges.
3. Add water leak sensors near the water heater, under sinks, and behind the washer.
4. Find and tag your shutoff valve now, and make sure everyone at home knows where it is. If it will not turn, do not force it (IWVWD); have a plumber service or replace it.

Not sure what you are looking at? Upload a photo to PlumberNearMe.ai for a free AI diagnosis and a typical cost range.

Sources

• American Red Cross: Checking Your Home's Utilities
• American Red Cross: Disaster Cleanup and Repair for Your Home
• LADWP: Water Quality FAQs
• LADWP: Report Water Outage
• Western Municipal Water District: How to Turn Off Your Water
• SFPUC: Home Water Shutoff Valve
• Trabuco Canyon Water District: Rules and Regulations (PDF)
• Indian Wells Valley Water District: Locate Your Water Shutoff Valve
• ESFI: Flooding and Disaster Safety
• ESFI: Flood Electrical Safety
• ESFI: Home Safety
• EPA: A Brief Guide to Mold, Moisture and Your Home
• California Department of Insurance: Residential Property Claims Guide
• 2025 California Plumbing Code, Section 608.2
• EPA: Know Your Plumbing (PDF)