How to Shut Off Your Main Water Valve
Every homeowner should know how to quickly shut off their home's water supply. In an emergency, this knowledge can prevent thousands of dollars in water damage.
Finding Your Main Shut-Off Valve
Common Locations:
- Basement: Near the front foundation wall, often where the water line enters
- Crawl Space: Along the wall closest to the street
- Ground Level (warm climates): Near the water heater or in the garage
- Near the Street: In a covered box (water meter box) near the curb
Types of Shut-Off Valves
Gate Valve (Round Handle)
Turn clockwise (right) several rotations until fully closed. These older valves may be stiff if not used regularly.
Ball Valve (Lever Handle)
Turn the lever 90 degrees so it's perpendicular to the pipe. This fully closes the valve.
Step-by-Step Instructions
- Locate the valve before an emergency
- Test it by turning it clockwise—don't fully close unless needed
- Keep the area accessible—don't store items in front of it
- Label it so family members can find it easily
What to Do If the Valve Won't Turn
- Apply penetrating oil (like WD-40) and wait 15 minutes
- Use an adjustable wrench for better grip
- Turn slowly and gently—forcing can break the valve
- If it still won't budge, call a plumber to replace it
The Street Shut-Off (Last Resort)
If your indoor valve fails, use the street shut-off:
- Locate the water meter box near the curb
- Use a meter key or large adjustable wrench
- Turn the valve 90 degrees to shut off
Note: In some areas, only utility workers can legally operate the street valve.
Maintenance Tips
- Test your shut-off valve every 6 months
- Keep a flashlight near the valve location
- Teach all adult family members where it is
- Consider upgrading old gate valves to ball valves
Need help with your plumbing system? Connect with local plumbers who can inspect your shut-off valves and ensure they're working properly.