Should I shut off my water during a plumbing emergency?
Short answer
Yes, whenever water is escaping and you cannot isolate it at the fixture. Closing the main shutoff is the fastest way to limit damage, and it does not interfere with a plumber's diagnosis.
Last updated
Where to find the main shutoff
- In the meter box near the street (may need a meter key)
- On the exterior wall where the supply line enters
- In a garage, utility room, or under a sink for fixture-level stops
How to close it
Turn a gate valve handle clockwise until it stops; turn a ball valve lever a quarter turn so it sits perpendicular to the pipe. If a valve is seized, do not force it — call the utility or a plumber.
Related questions
Do I need to shut off the water heater too?
Yes if the main supply is off for more than a short period, to avoid heating with reduced water in the tank.
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