Frozen pipe repair in Potomac, MD

The frozen stage is the best time to act, because a pipe that has only frozen hasn’t necessarily failed yet. Many of the burst pipes that plumbers see are the same pipes, a few hours later, once the ice melts and the crack starts leaking. If it has already split, our page on emergency burst pipe repair picks up from there.

How to tell a pipe is frozen

• A tap that gives only a trickle or nothing, usually when it’s the only one affected.
• Frost or a visible bulge on an exposed pipe.
• Strange sounds, such as banging or gurgling, when you try the tap.
• Water that suddenly stops after a night of hard cold, particularly in a kitchen or bathroom on an outside wall.

What you can safely try first

1. Open the cold tap nearest the frozen section. WSSC Water gives the same advice: leave it fully open so melting water has somewhere to go, and so you can see when flow returns.
2. Shut off the main valve if you see any crack, drip or bulge. If the pipe has split, thawing it will release the water.
3. Warm the pipe gently. A hair dryer, a heating pad wrapped around the pipe, or warm towels all work. Start at the tap end and work back toward the frozen section.
4. Raise the room temperature. Open cabinet doors under sinks on outside walls so warm room air reaches the pipes.

When to stop and call

• The pipe is visibly split, bulging, or dripping.
• It’s behind a wall, under a slab, in a crawl space you can’t safely reach, or you can’t tell where it is.
• You’ve tried gentle heat for an hour with no change.
• More than one fixture is affected, which can point to the main line or the meter.

What the plumber does

A plumber can thaw a pipe with equipment that heats it more evenly than a hair dryer, then inspect the length for cracks before water is restored. Where a pipe has split, that section is replaced. The plumber will often also look at why it froze: an uninsulated run in an exterior wall, a pipe in an unheated garage, a hose connection left attached, or a draft from a gap in the foundation.

Potomac winters and the main line

Sharp temperature drops cause trouble beyond your house. WSSC Water has reported that main breaks can show up a day or two after a hard cold, and that meters can freeze and cause an outage. If the whole house loses water at once and your neighbors have the same problem, it may be the system and not your pipes, so it’s worth a call to WSSC at 301-206-4002 before assuming you have a frozen line. Tree-heavy lots add a risk of their own, since a storm that knocks out power also knocks out the heat, a scenario the Potomac Woods page walks through. Houses that sit empty over a cold stretch are the ones most likely to be found frozen late, which is why we cover empty-house and outbuilding checklists on the Falconhurst and Great Falls Estates pages.

Preventing a repeat

• Disconnect hoses and shut off the indoor valve to outside spigots before the first freeze.
• Insulate pipes in garages, crawl spaces and exterior walls.
• During a hard cold snap, let a thin stream run from a tap on an exposed line, and keep the house heated, even when you’re away.
• Know where your main shut-off valve is before you need it.

If a pipe in your house keeps freezing, ask a plumber about rerouting or insulating it. Anyone looking for the nearest option can start with a burst pipe repair service in Potomac that connects callers with independent plumbers.

Questions people ask

Related services

• Emergency Burst Pipe Repair

  A split pipe or blown joint with water actively escaping.

• Wall Pipe Leak Repair

  Hidden leaks inside walls: damp drywall, stains, sound of running water.

• Main Water Line Repair

  The line that carries water from the street into your house.

• Pipe Replacement / Repiping

  Replacing worn-out or failing pipe, in part or the whole house.

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.