Burst pipe: what to do in the first 10 minutes

Ten minutes is a useful target because most of the damage from a broken supply line comes from how long it runs, not how badly it broke. A household line delivers a steady stream until someone closes a valve. The steps below are in the order that limits damage fastest.

Minutes 0 to 2: where do you shut off the water?

Go straight to the main shutoff valve for the house. In a house built on a concrete slab with no basement, the main usually comes up out of the ground near the front of the house or in the garage, close to where the line from the street enters. Look for a gate valve with a round handle or a ball valve with a lever. A lever is closed when it sits crosswise to the pipe.

If you cannot find it or it will not turn, go to the water meter. Fallbrook Public Utility District, for instance, tells customers the meter is usually near the front of the lot facing the street. Meter valves often need a meter key or a wrench, and some utilities would rather you call them than force the valve, so use it only if the house valve fails.

If the leak is clearly at one fixture, the small stop valves under sinks and behind toilets, or the cold inlet valve on top of the water heater, can isolate it without shutting off the whole house.

Minutes 2 to 4: is it safe to be in the room?

• Electricity. Do not walk through water that is touching outlets, power strips, extension cords or appliances. If you can reach the breaker panel while standing on a dry floor, switch off the circuits for the wet area. If reaching the panel means standing in water, leave the power on and call SDG&E or an electrician.
• Ceilings. A sagging ceiling holding water can come down. Keep people out from under it and, if it is safe, put a bucket under the low point.
• Gas. If you smell gas at any point, stop. Leave the house first, then call 911 and the gas utility from a safe place. In Oceanside and the San Diego County towns that is SDG&E at 1-800-611-7343. In Murrieta, Temecula, Wildomar and San Clemente it is SoCalGas at 1-800-427-2200. Your utility is shown on your gas bill; all-electric homes and propane users should call 911 and their propane supplier. Our gas smell guide goes through this in more detail.

Minutes 4 to 6: drain the pressure out of the lines

With the main closed, open the lowest faucet in the house, such as a tub spout or an outside hose bib, and an upstairs faucet if you have a second floor. That empties the water still sitting in the pipes so less of it comes out of the break. If the main will be off for more than a short time, set a gas water heater to its pilot or vacation setting, or turn off the breaker for an electric one, so it is not heating with the supply cut off.

Minutes 6 to 8: is the leak yours or the utility's?

Where the water comes from decides who pays and who you call. The City of Oceanside tells homeowners that water and sewer service lines on their property are theirs to repair and pay for. Fallbrook Public Utility District draws the line at the meter: leaks on the property side belong to the customer, and leaks at the meter, in the street or at a hydrant belong to the district. Other agencies use similar splits, so read your utility's rules if it is unclear.

Useful utility numbers from local sources:

• City of Oceanside Water Utilities: (760) 435-3900, option 4 during the day or option 1 after hours, for main breaks and leaking hydrants.
• Vista Irrigation District: (760) 597-3100 for emergencies after hours, weekends and holidays.
• San Dieguito Water District (parts of Encinitas): after-hours emergencies (760) 633-2922.
• City of San Clemente utilities hotline for water leaks and sewer overflows: 949-366-1553. Homeowners in San Clemente served by Santa Margarita or South Coast Water District should call that district instead.
• Fallbrook Public Utility District: (760) 728-1125. Rainbow Municipal Water District: (760) 728-1178. Elsinore Valley MWD (Wildomar): (951) 674-3146.

Minutes 8 to 10: document and start drying

Before you move much, take photos and a short video of the break, the water on the floor and anything damaged. Then start removing water.

• Pull rugs, boxes and furniture out of the wet area and set wood furniture legs on foil or blocks.
• Mop or wet-vacuum standing water once the power to that area is off.
• Open cabinet doors and closets so air reaches wet surfaces, and run fans and a dehumidifier if the circuits are safe.
• Save the broken fitting or section of pipe if a plumber removes it. An insurer or adjuster may ask about it.

The EPA's mold remediation guidance frames water damage response around drying within 24 to 48 hours. Its table says wet carpet should be extracted and dried with fans and dehumidifiers, and that drywall can sometimes be dried in place if it is not swollen and the seams are intact, but otherwise should be cut out and replaced. Large or hidden wet areas are where a water damage drying company earns its fee.

On insurance, the National Association of Insurance Commissioners explains that homeowners policies generally cover damage from a sudden and accidental discharge from the plumbing system, and that a freeze-related burst may not be covered if the insurer finds the owner neglected reasonable steps to prevent it. Call your insurer early, and ask specifically about the cost of opening walls or floors to reach the pipe.

Why do pipes burst in a mild climate?

Hard freezes are uncommon near the coast, so in Oceanside and Encinitas a burst line is more often a failed braided supply hose, a corroded fitting, a split at a water heater connection, or a pipe that has been leaking under a slab. Inland around Fallbrook, Murrieta and Temecula, an occasional cold night can still catch an exposed hose bib or an irrigation line. The prevention steps NAIC cites for cold weather are simple: disconnect garden hoses, insulate exposed pipes in garages and exterior walls, and open sink cabinets on the coldest nights.

What happens after the first 10 minutes?

A plumber will find the break, decide whether a spot repair is enough, and pressure-test the system before the water goes back on. For a single failed fitting, burst pipe repair in Oceanside is usually a same-visit job. If the break is in a wall or under the slab, electronic leak detection can locate it before anyone starts cutting. Repeated failures across a house point toward repiping, which the City of Oceanside permits as a residential re-pipe.

Permit rules matter in the inland cities too. Murrieta's building department treats replacing a defective concealed pipe as new work that needs a permit and inspection, and it requires an emergency repair to have a permit application filed by the next working business day. If you are dealing with a burst pipe in Murrieta, ask the plumber to handle that filing.

Not sure whether to pay for a night or weekend call? If the water is off and nothing is wet near electricity, you may be able to wait for regular hours; our guide on when to call an emergency plumber covers the tradeoffs. If water is still running, or you cannot shut it off, call an emergency plumber now. Homes along the SR-78 corridor can also reach after-hours plumbers in Vista.