Practical guide
How to find the main water shutoff
Look for an accessible valve near the service entry and stop if it appears damaged.
Where to look
The main valve is often near the point where the water service enters the building. In many houses this may be in the basement toward the front wall, but installations vary.
Do not force anything
A stuck, corroded, unfamiliar valve or one near a hazard should not be forced. A wrong move can worsen a leak.
After shutting it off
Check whether flow decreases, inform occupants, and wait for professional direction before restoring water. This page offers general orientation, not a building-specific procedure.
If water continues to flow, see emergency plumbing and describe what is visible without dismantling the installation.