How to Shut Off the Main Water Supply
Shut off your main water valve fast during a leak or burst pipe by locating it near the water meter and turning it fully closed. Knowing this location in advance saves critical time during an emergency.
Every property has a main shut-off valve controlling water to the entire building, separate from smaller isolation valves under individual sinks or toilets. Finding it before an emergency happens means you’re not searching for it while water is actively flooding a room.
Step-by-Step: How to Shut Off the Water
- Locate the main valve — Find the main shut-off valve, usually near the water meter, in a garage, utility area or an exterior box at the property boundary.
- Identify the valve type — A gate valve has a round handle turned counterclockwise to close; a ball valve has a lever turned a quarter turn until it sits crosswise to the pipe.
- Turn off the valve — Close the valve fully — turn a gate valve until it stops, or turn a ball valve lever 90 degrees.
- Open a tap to relieve pressure — Open the nearest tap to release remaining pressure in the pipes and confirm the water supply is off.
- Call for emergency repair — With the water off, contact an emergency plumber to repair the leak or burst pipe before turning the supply back on.
Find Your Valve Before You Need It
Locate and test your main shut-off valve now, rather than during an emergency. A valve that hasn’t been turned in years can seize, so a yearly test keeps it working when it matters.
When to Call a Plumber
Once the water is off, a burst pipe or major leak needs prompt repair before restoring supply. 24/7 emergency plumber service responds quickly to stop the damage and complete the repair safely.