Immediately after a water pipe bursts, close the main water valve, then open a faucet on the lowest floor to drain the water still in the pipes. Stay away from any water near outlets or appliances, and start removing standing water as soon as it is safe to do so.
Close the Main
The main valve is usually near the water meter, often in the basement or a utility area. A round handle turns clockwise until it stops, and a lever turns a quarter turn so it sits across the pipe. If the valve is stiff, use steady pressure rather than force. If it will not close, call for help immediately. It is worth finding this valve now, before you ever need it.
Drain the Lines
Closing the main stops new water, but the pipes are still full. Opening a cold faucet on the lowest level lets that water leave through the sink instead of through the break. If the burst is on a hot water line, turn off the water heater too.
Watch for Electrical Hazards
Water that reaches cords, outlets, or appliances can carry current. Do not step into it. Switch off the wet rooms at the breaker panel only if you can reach the panel from a dry spot.
Start the Cleanup
Mop and towel up standing water, lift rugs, and move furniture and electronics to dry rooms. Once power is safe, run fans and open windows. Take photos of the damage and the broken pipe for insurance before throwing anything away.
Resist taping the pipe and turning the water back on. A patch can fail under full pressure.
Once the water is stopped, a plumber can cut out the split and fit new pipe. If your other pipes are the same age, a look at whether other lines need attention is a smart next step. Call JPR Plumbing at (833) 603-1840.