This page covers the repair itself. If you haven’t shut the water off yet, the short checklist on our page about burst pipe repair in Potomac takes about two minutes and is worth doing before anything else.
What counts as an emergency?
Call right away if a pipe has split along its length, a joint has blown apart, or a supply line is spraying inside a wall, ceiling or crawl space. A slow drip under a sink is still worth fixing, but it can usually wait for a scheduled visit. A useful test: if closing a valve stops the water and nothing is getting wet, you have time. If you can’t stop it, or the water is already soaking drywall, flooring or insulation, it’s an emergency.
What the plumber does when they arrive
- Confirm the water is off. They’ll check the main shut-off and, if the valve is stuck or leaking, isolate the damaged branch another way.
- Find the break. Sometimes it’s obvious. When water is traveling along a joist or behind a wall, the visible wet spot can be several feet from the actual failure, so they may use a moisture meter or open a small access hole.
- Cut out the damaged section. A split pipe isn’t patched with tape or a clamp for the long term. The failed length comes out and new pipe goes in with proper fittings.
- Restore pressure and test. The line is brought back up slowly and checked for leaks at every new joint, then at the nearest fixtures.
- Look at what caused it. One burst in an otherwise sound system is a repair. Several pinholes or a crumbling run of old pipe points toward replacement, and a good plumber will say so plainly.
Why pipes burst in the first place
- Freezing. Water expands as it turns to ice, and the pipe usually fails where the ice blocks the line, not always where it froze. See our page on frozen pipe repair for what to do before a split happens.
- Age and corrosion. Older copper develops pinholes. Galvanized steel rusts from the inside and narrows. Polybutylene, used in many homes from roughly the late 1970s to the mid-1990s, has a poor failure record.
- High water pressure. Household pressure is normally in the range of 40 to 60 psi. Sustained pressure above 80 psi stresses joints, fixtures and appliances. A plumber can check it with a gauge in a couple of minutes, and our Merry Go Round Farm page shows how to check it yourself.
- Water hammer. The bang you hear when a valve shuts quickly sends a shock through the pipe, and over years it loosens fittings.
- Ground movement or a damaged line. Underground lines can shift or get nicked during digging, which matters most for the main water line.
What affects the price. We don’t quote prices because the plumbing company that comes out sets them. The main factors are how hard the break is to reach (an exposed basement pipe versus one behind a finished ceiling), the pipe material, how much pipe has to be replaced, and whether the visit is after hours. Ask for an estimate in writing before work begins, and ask whether drywall, flooring or paint repair is included. It usually isn’t.
Plumber or WSSC Water: who do you call?
In Potomac the split is fairly clear. WSSC Water is responsible for the water main in the street and the connection up to your property line. You are responsible for the service line from the property line to the house and for every pipe inside it. If water is bubbling up in the street or at the meter vault, call WSSC Water’s emergency line at 301-206-4002. If the leak is on your side, you need a plumber, and that’s the call we connect.
The clock on water damage
Standing moisture in building materials can start supporting mold within a day or two, so drying matters nearly as much as the repair. Take photos and video of the damage before you move anything, keep receipts, and call your insurer early. Many homeowners policies cover sudden, accidental pipe bursts but not damage from a leak that went unnoticed for weeks, so the details of your policy matter. In bigger multi-story homes (the notes on our Avenel page are written with these in mind), a break upstairs can reach several rooms below before anyone notices, so the first look should include the ceilings underneath. And if the water is in a basement and you’re not sure it’s a pipe at all, the Lake Potomac page explains how to tell a pipe from groundwater.
When a repair isn’t enough
If the plumber finds the same material failing in more than one place, or if this is the second or third leak in a year, a patchwork of repairs can cost more over time than a planned pipe replacement. If the burst is in the line that carries water from the street, see main water line repair. For a leak that has already come through a ceiling, our page on ceiling pipe leaks covers the extra steps.
Questions people ask
How long does an emergency burst pipe repair take?
Can I fix a burst pipe myself with a clamp or tape?
Is a burst pipe covered by homeowners insurance?
Do I need to turn off the water heater?
Related services
Frozen Pipe Repair
Thawing frozen lines and fixing the splits ice leaves behind.
Main Water Line Repair
The line that carries water from the street into your house.
Ceiling Pipe Leak Repair
Water coming through a ceiling from a pipe above.
Wall Pipe Leak Repair
Hidden leaks inside walls: damp drywall, stains, sound of running water.
A note on this guide. This page is general information, last reviewed October 2026. It can’t replace a plumber looking at your actual pipes, and Burst Pipe Fix Pros does not perform plumbing work.