How to Shut Off Water During a Plumbing Emergency

Editorially reviewedBy the Home Services Resource Center Editorial TeamLast reviewed: June 2026

This guide is written to help homeowners understand common plumbing repair, installation, water heater, drain, and emergency considerations. It is educational and is not a substitute for an on-site evaluation by a licensed plumber. HSRC does not perform work directly, set contractor pricing, or guarantee availability — services and response times vary by location and provider.

Quick Answer

Locate the main water shutoff before you need it. Most are near where the water line enters the home — in a basement, utility room, garage, or outside in warm climates. Most fixtures also have local shutoff valves under sinks and behind toilets.

Key Takeaways

Know your main shutoff location now
Most toilets and sinks have local valves
Turning off the heater prevents added damage
Practice the shutoff once a year

Where to find the main shutoff

In basements: near the front foundation wall. In slab homes: in the utility room or garage. In warm climates: outside near the meter.

Fixture-level shutoffs

Under each sink, behind each toilet, and at the water heater.

Practice

Turn the main shutoff on and off once a year to ensure it operates and doesn't seize.

Ready for the next step?

Get connected with a local licensed plumber, or call the plumbing line.

Get Matched With a Local Plumber Call for Plumbing Help

Frequently asked questions

What if I can't find the main shutoff?

Check near the water meter. If still unclear, your municipal water provider can show you. A plumber can also install a clearly labeled valve.