How to Tell If a Pipe Burst (And What to Do Next)

Some burst pipes announce themselves with a ceiling coming down. Most don't. The majority of pipe failures start as hidden leaks inside walls, under slabs, or in crawl spaces — running silently for days or weeks while the damage compounds. Here's how to recognize both kinds, confirm your suspicion, and act fast enough to matter. Water actively flowing right now? Skip to the shutoff steps below, then call (888) 245-6962 — free, 24/7.

The Obvious Signs

Water where it shouldn't be — pooling, dripping through ceilings, running down walls
The sound of running water when every fixture is off — hissing, rushing, or dripping inside a wall
A sudden drop in water pressure at faucets and showers, especially on one floor or one side of the house
No water at all from certain fixtures — a fully severed pipe upstream

The Hidden Signs (These Are the Expensive Ones)

A water bill that jumped with no change in habits — often the very first clue of a slab or underground leak
Water stains, bubbling paint, or sagging drywall on ceilings and walls — water traveling from a leak somewhere upstream
Warm spots on the floor (hot-water slab leak) or unexplained damp patches of carpet
Musty smells or new mold in one area — moisture is feeding it from somewhere
The water meter test — your confirmation tool: turn off every fixture and appliance that uses water, then watch the meter. If the dial or leak indicator still moves, water is flowing somewhere in the system. Note the reading, wait 30–60 minutes touching nothing, and check again. Movement = leak. Then close the house's main shutoff and re-test: if the meter stops, the leak is inside the house; if it keeps moving, it's in the service line between meter and house.

Why Pipes Burst

Freezing is the famous one — water expands as ice, splits the pipe, and the flood arrives at thaw, when the ice plug melts and the split opens up. But pipes also fail from age and corrosion (galvanized steel and old copper), water pressure that's too high, clogs that build pressure behind them, shifting foundations (the slab-leak engine of Texas and Arizona), and simple mechanical failure at joints and fittings. If your home is 30+ years old with original plumbing, hidden leaks are a when, not an if.

What to Do Next: The First Hour

Shut off the main water valve. It's usually where the supply enters the house — basement wall, crawl space, garage, or at the meter box outside. Every household adult should know this valve's location before the emergency.
For a hot-water pipe, also close the valve on top of the water heater.
Open the lowest faucets in the house to drain remaining pressure and redirect water out of the walls.
Kill electricity to affected areas if water is anywhere near outlets, fixtures, or appliances — at the breaker, with dry hands, standing on dry ground.
Document everything — photos and video of active water, damage, and the source once found. Your claim depends on it.
Call (888) 245-6962 for emergency water damage response, and call a plumber for the pipe repair itself. (These are two different jobs: the plumber fixes the pipe; the restoration pro extracts the water and dries the structure so the wet building doesn't become a moldy one.)
Call your insurance company. Sudden pipe bursts are among the most commonly covered water losses on homeowners policies — but insurers expect prompt mitigation, so don't wait on drying to "see how bad it is."

Don't Skip the Drying

Here's the mistake that turns a plumbing bill into a renovation: fixing the pipe and mopping the floor, while the water that went into the walls, insulation, and subfloor stays there. Drywall wicks water upward, wet insulation never dries on its own, and mold starts within 24–48 hours. Professional structural drying — extraction, air movers, dehumidification, and moisture-meter verification over several days — is what actually ends a pipe burst. See what the full restoration process involves and what it costs.

Prevent the Next One

Insulate pipes in exterior walls, attics, and crawl spaces; keep heat at 55°F+ and cabinet doors open during hard freezes; let vulnerable faucets drip when temperatures dive; replace rubber washing machine hoses with braided steel; and check your home's water pressure (over ~80 psi stresses everything — a $10 gauge tells you).

Suspect a burst or hidden leak right now? Call (888) 245-6962 — free, 24/7 — and get an IICRC-certified water damage pro moving while you call the plumber.