How to know if a pipe burst

Three tells expose a burst pipe: noise, a stain, or a meter dial that refuses to rest. Hear liquid moving behind closed taps, or catch the dial creeping with the house empty, and you should assume a split. Everything here sits under the leaks and burst pipes section, written for Santa Monica and the Westside.

The order never changes. Cut the water, protect what is wet, then arrange the repair. Jump to whichever step you are on.

What does a burst pipe look, sound and smell like?

Seven symptoms cover almost every case. One alone deserves a look. Two at once nearly always mean water is leaking from the line before it ever reaches a fixture. Fast failures are obvious within minutes, whereas slow splits often surface first as a bigger bill than usual.

• Noise: hissing, trickling behind a wall, or a faint drumming when no fixture is in use.
• A restless meter: the little triangle or low-flow wheel turns while the house is idle.
• Soft surfaces: paint blisters, drywall goes spongy, a tea-colored stain widens on a ceiling.
• A warm spot underfoot: on a concrete slab, this can mean a hot line is leaking beneath you; see slab leak repair costs.
• Thin streams: taps weaken because part of the flow leaves the pipe early.
• Smell: earthy and damp, strongest beside one wall or cabinet.
• Bill shock: if the bill is the clue, the water bill explainer helps decode it.

Can the water meter prove it in two hours?

Yes, for supply pipes. Stop all water use inside and out. Jot down the meter figure. Return in two hours without having used any, and compare. A different number says the pipes are losing water. The EPA describes the same method. Drain pipes leak outward at low pressure, so this check will not reveal them.

Prepare first: pause the ice maker and sprinklers, and ask everyone not to flush. A phone snapshot of the dial, before and after, removes doubt. When the number has moved, shut the valve where the pipe enters your house and watch the dial again. A dial that has stopped puts the leak on your side of the house valve. If the dial still turns, suspect the stretch between the meter and your property, which the water utility serving your address handles, not a plumber.

What if the burst is below the floor?

With a raised floor, crawl under with a flashlight and look for drips, dark soil, or insulation drooping wet. With a concrete slab, there is nothing to see, so lean on warm floor patches, nighttime running sounds and the meter result.

Raised foundations with a small access hatch outside are common among older Westside houses. Wear boots and gloves, and never crawl into water near wiring. Back out and phone a plumber if the ground is saturated or you catch a gas odor.

Concrete hides the pipe entirely, so a plumber listens with an acoustic microphone or traces heat with a thermal camera. The process is called leak detection; the leak detection cost guide lists typical prices.

Water is spraying right now: where do I start?

Close the water at the main, cut power to wet areas, open the lowest tap, then contain and photograph. Moving fast limits the damage, because flow keeps adding to the repair bill. Here is a sequence that works in a panic.

1. The shutoff lives by the meter or against the house wall; a clockwise turn closes it. Stiff, aged valves may need steady pressure; mention it if yours will not budge.
2. Flip breakers for rooms where water touches outlets or appliances, and stay out of puddles until that is done.
3. Open the tap furthest downhill to relieve the line. A water heater that lost its supply should be switched off at its gas control or breaker.
4. Mop, wet-vac, and open windows. Warm damp drywall can grow mold fast.
5. Photograph rooms and belongings before you touch anything. The burst pipe insurance guide explains what an adjuster usually wants.

Smelling gas overrides all of this. Leave the building, and then, from the sidewalk, SoCalGas takes the call at 1-800-427-2200.

Can a leaking pipe be sealed without replacing it?

For a few hours or days, yes. Epoxy putty, a rubber sleeve with hose clamps, or a bolt-on repair collar will hold a pinhole in sound pipe. They are stopgaps, not repairs. Where metal has corroded thin, a patch just moves the weak point a few inches along.

With the water off and the pipe wiped dry, follow the directions on the putty or sleeve. PVC drains can be bridged by a flexible coupling with stainless bands. Pressure pushes against any patch, so keep the water off until a plumber has looked.

Galvanized steel from older homes corrodes from the inside along its whole length, so one patched hole is rarely the last. Before paying for repeat fixes, check galvanized pipe replacement.

How long does pipe bursting take?

The phrase has two meanings. Trenchless pipe bursting pulls new plastic pipe through an old sewer line, breaking the old pipe outward; for a house lateral, contractors often describe a day or two after pits are dug. Mending a burst supply pipe may take an afternoon.

Access is the swing factor. A split in an exposed crawl space is a short job. The same split behind tile or under a slab requires opening, drying and closing the surface. A realistic time window comes only after the plumber sees the spot, and check whether the estimate lists wall and floor repair.

Reasons for splits are covered in why pipes burst, with ideas in burst pipe prevention.

Common questions

Will the visit eat up my day?

A short copper or PEX section commonly takes two to four hours, counting shutoff and pressure testing. A buried or walled-in pipe runs longer. After looking at the damage the plumber should name a window, and any big change should be put on the estimate before it happens.

What should I settle before agreeing to the work?

Type the contractor's license number into the state board's lookup. Learn whether you are paying a set price or an hourly rate, who handles a permit, and if drywall and flooring are in scope. Deposits on home improvement jobs are capped by state law: a tenth of the price or $1,000, with the lower number winning.

Must someone stay home?

An adult needs to open the door, show where the water shuts off and where the damage is, and accept the finished job. Between those moments, someone you trust can stand in. Renters should loop in the landlord, who may have to approve access.