How to Shut Off the Main Water Valve in an Emergency

In the event of a burst pipe, appliance failure, or sudden leak, shutting off your home’s main water valve immediately can prevent extensive flooding and costly damage. Acting fast isolates the problem, giving you time to assess the situation and call for professional help.

Why Shut Off the Main Valve?

Turning off the water at its source minimizes water intrusion into walls, floors, and personal belongings. It also protects appliances and plumbing fixtures, helping you avoid expensive restoration and mold remediation.

Step 1: Locate the Valve

Your main shut-off valve is typically found:

• Near the water meter—in a garage, utility closet, or basement
• At the front exterior of your home, where the water line enters
• In a crawl space or utility room, especially in older properties

Step 2: Turn the Valve Clockwise

Using your hand or an adjustable wrench (if the valve is stiff), rotate the handle clockwise until it stops. Most modern homes use a ball or gate valve; if yours has a packing nut, apply a little plumber’s grease to the threads to keep it from seizing.

Step 3: Verify the Shut-Off

Open a nearby faucet to confirm no water flows. If water continues, double-check the valve or head over to our Emergency Plumbing Services page for immediate assistance.

When to Seek Professional Help

If you can’t locate the valve, it’s corroded, or leaks persist after turning it off, contact our licensed pros through Emergency Plumbing Services right away.

For detailed info on your local water system, check the San Antonio Water System.

Regularly test your shut-off valve during routine maintenance, and keep a wrench or handle nearby so you’re always ready in an emergency.