What To Do When Your Pipes Burst

Last Revised: 10/9/2026

A burst pipe doesn't give you much warning, and once it happens, every minute matters. This isn't the moment to search around for the right answer — so here it is, upfront: what to shut off, what to check, and what to do before help arrives.

If you're reading this because you suspect a pipe is frozen but hasn't burst yet, our guide on how to tell if your pipes are frozen covers the signs and safe thawing steps — this article picks up from where that one leaves off, for when it's already happened.

Quick distinction, since the right response depends on it: a burst pipe fails suddenly and visibly, with a sharp pressure drop across the house. A slow leak builds gradually and can hide behind a wall for weeks. A frozen-but-not-yet-burst pipe shows up as reduced flow at one fixture with no water visible yet. If you're not sure which one you're dealing with, the steps below are still the right starting point — they're written for the "water is visibly escaping right now" scenario.

Signs Your Pipes Have Burst

• Visible water — pooling on the floor, dripping from a ceiling, or dampness on a wall where there shouldn't be any.
• Water stains or sagging on ceilings or walls, which often means water has been accumulating behind the surface before it became visible.
• A sudden drop in water pressure across the house, not just one fixture — that points to a leak somewhere in the main line rather than a single clogged faucet.
• Hissing or dripping sounds inside a wall or floor, even without visible water yet.
• An unexplained spike in your water bill, which can be the first sign of a slow leak before it becomes a full burst.
• Mold, mildew, or a musty smell developing somewhere new, especially in a basement or near plumbing walls.

What Causes Pipes to Burst?

Understanding the cause doesn't change what you do right now, but it does help you prevent the next one:

• Freezing. Ice expanding inside a pipe builds pressure that the pipe material can't withstand. This is the single most common cause heading into a Pennsylvania winter — see our guide on spotting and safely thawing a frozen pipe before it gets to this point.
• Water pressure that's too high. Normal residential water pressure runs 40-80 psi, with 45-65 psi considered the comfortable middle. Plumbing code (IPC 604.8 / UPC 608.2) caps static pressure at 80 psi and requires a pressure-reducing valve above that — pipes, fittings, and appliances all take on unnecessary stress above this range over time.
• Corrosion and age. Older galvanized steel and some copper lines corrode from the inside out, thinning the pipe wall until it can no longer hold pressure.
• Tree root intrusion. This is a sewer-line and underground-line issue specifically — roots seek out the moisture in aging or already-cracked sewer pipes and can crack them further over time. It's a different (though related) problem from a burst supply pipe inside your home.
• Severe, long-term clogs. A clog that goes unaddressed can put sustained backpressure on a pipe.

What to Do Immediately After a Burst Pipe

The first and most important step is shutting off your main water valve. Everything else follows from there:

1. Shut off your main water valve. This comes before calling anyone. Most main valves are a ball valve (quarter-turn the lever until it's perpendicular to the pipe) or a gate valve (turn the round wheel clockwise until it stops). If you don't already know where yours is, our guide to finding and using your main water shutoff valve is worth reading today, not during the emergency — but if you can see the burst and there's a closer fixture or appliance shutoff, closing that first buys you time while you locate the main.
2. Check for electrical risk before you do anything else in the room. If standing water has reached outlets, power strips, or an electrical panel, shut off power to that area at the breaker — but only if you can clearly identify the right breaker and reach the panel without stepping in water. If you're not sure which breaker, or the panel itself is wet, don't guess: leave the room and wait for a professional instead of flipping switches near water.
3. Call a licensed emergency plumber. The sooner a professional is on the way, the sooner the source gets fixed instead of just contained.
4. Drain remaining water from the pipes. Open the lowest faucet in the house (cold first, then hot, with your water heater turned off) to relieve any remaining pressure in the lines.
5. Start removing standing water once it's safe to do so — a wet/dry vac, towels, or a sump pump for larger amounts. The faster water is removed, the less chance of mold setting in.
6. Document everything, then call your insurance company. Photos and video of the damage, before you move or discard anything, make your claim significantly smoother. Call your insurer the same day — most policies expect you to take reasonable steps to limit further damage, and starting the claim early tends to go better than waiting.
7. Protect what you can. Move furniture, rugs, and anything irreplaceable — especially items stored in a basement — to a dry area.

Leave the house and call 911 before doing any of the above if: you smell gas, a ceiling is visibly sagging or bulging under the weight of trapped water, or the electrical panel itself is flooded. Those situations are a structural or life-safety risk first, and a plumbing problem second.

Temporary Fixes (Until the Plumber Arrives)

These aren't repairs — they're ways to slow a leak down while you wait, and only worth attempting once the water is shut off and it's safe to work on the pipe:

• A pipe repair sleeve or clamp, sized to fit over the damaged section, can significantly reduce leaking.
• A rubber pad, wood block, and C-clamp work as a makeshift version of the same idea if you don't have a repair sleeve on hand.

Either way, treat this as a stopgap. Keep the main water off while you apply either fix — don't restore pressure to test it — and don't turn the water back on at all until a plumber has actually inspected the pipe. A pipe that's burst once, under pressure, needs a proper repair, not just a patch left in place.

What a Burst Pipe Actually Costs

Worth knowing upfront: the Insurance Information Institute puts the average U.S. homeowner's claim for water damage and freezing at over $12,500 (2017-2021 data), and roughly 1 in 60 insured homes files a water-damage claim in a given year. The steps above — shutting off water fast, documenting damage, and getting a professional out quickly — are the biggest levers you have over where your specific claim lands in that range.

Related reading:

• How to Tell If Your Pipes Are Frozen (and What to Do Next)
• How Do I Shut Off My Main Water Line Valve?
• What Should I Do in a Water Leak Emergency? (Faucets, Appliances & More)
• The Homeowner's Winter Plumbing Prep Checklist

Mattioni Is Here When a Pipe Bursts

Here's the plan, in order:

1. Shut off the main water valve. Every minute counts.
2. Check for electrical risk, then call us. We answer emergency calls because burst pipes don't wait for business hours.
3. We get there fast, fix it right, and help you understand exactly what happened so it doesn't happen again.

The Mattioni family has handled emergency plumbing calls across Chester County and Southeastern PA for over 75 years. Schedule emergency burst pipe repair online, or call us now — we're here for you, any time, day or night.