Burst Pipe in the House: What to Do Right Now
A burst pipe can release many gallons a minute, so the first move is simple and everything: shut off the water. Every minute the main is open is more water in your walls and floors.
Stop the flow, kill power to any wet area, then get the water out and dried before it soaks into structure and starts mold.
If this is unsafe or getting worse right now, don't wait — call and we'll route you straight to an independent local pro.
What to do in the first 5 minutes
- Shut off the main water valve immediately — it's usually where the water line enters the house: in the basement, a utility closet, near the water heater, or in a ground box by the street. Turn it fully clockwise.
- If water is near outlets, wiring, or the electrical panel, shut off power to that area at the breaker — but don't stand in water to do it.
- Open the lowest faucets in the house to drain remaining pressurized water out of the burst line.
- Move furniture, rugs, electronics, and valuables away from the water and blot or vac up what you safely can.
- Photograph the damage for insurance, then call a local water-damage crew to extract and dry the structure before mold sets in.
Do not do this
- Never touch electrical outlets, cords, or the panel while standing in or near water — shut power off from a dry spot first.
- Never keep using the water supply once you know a pipe has burst — leave the main off until it's repaired.
- Don't ignore water inside walls or ceilings; a sagging or bulging ceiling can collapse and should clear the area below it.
- Don't use a regular vacuum on water — only a wet/dry (shop) vac is safe for standing water.
What's likely going on
Frozen pipe that burst
Water expands as it freezes and splits the pipe; the flood often hits when it thaws. Common in exterior walls, crawlspaces, and unheated areas during cold snaps.
Corrosion and old pipe
Aging galvanized or copper lines corrode and thin until they fail. Older homes are most at risk, and a burst here often signals more pipe near the end of its life.
Excess water pressure
Pressure above roughly 80 psi, or water-hammer shocks, stresses joints and fittings until one lets go. A pressure-reducing valve is the usual fix.
Failed joint, fitting, or supply line
A cracked fitting or a burst braided supply line under a sink or behind a toilet is a frequent, sudden cause. Only a plumber can confirm and repair the failure point.
Diagnose it now
What it typically costs
The plumbing repair itself is separate from the cleanup. Professional water extraction and drying runs roughly $3–$4 per square foot for clean supply water; if it stays wet past about 72 hours, mold remediation commonly adds $1,100–$3,400. Shutting the main off quickly and drying fast is what keeps costs down. A crew will scope the exact figure on site.
Frequently Asked Questions
Where is my main water shutoff valve?
Follow the water line to where it enters the house — commonly in the basement or crawlspace, a utility or laundry closet, near the water heater, or in an in-ground box near the street. Turn it fully clockwise to stop all water to the house.
What do I do right after a pipe bursts?
Shut off the main water valve first, then kill power to any wet area from a dry spot, open low faucets to drain the line, and move valuables clear. Then call a water-damage crew to extract and dry before mold starts.
Will my ceiling collapse from a burst pipe?
A ceiling that's sagging, bulging, or dripping is holding trapped water and can give way. Keep people out from underneath, and if it's safe, place a bucket and relieve a small drip with a pinhole — but don't stand under a bulging area.
The service that handles this
Guidance only — independent local providers assess and price their own work. Last reviewed 2026-07.
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