Knowing where the main water shutoff is before an emergency can save time. Valve locations vary by home and plumbing layout.

Look in likely utility areas such as a basement, crawl space, utility room, or near where the water line enters the home.

If you are unsure which valve controls the supply, consult a plumber rather than guessing during an emergency.

Keep access to the valve clear and tell household members where it is.

Never enter a flooded area or approach electrical equipment to reach a valve.

When to contact a professional

If the source is unclear, the leak continues, or pipe access requires opening walls or floors, arrange an assessment from an appropriately qualified plumbing professional. Do not take risks around electrical hazards, structural damage, or contaminated water.

More resources

This article provides general educational information, not a remote diagnosis. Conditions vary by property and should be assessed by an appropriate professional.