How Do I Shut off My Home's Water Supply in an Emergency?

The main shutoff valve is the single point that stops all water entering your home. It is typically located where the water line comes through the foundation, often in a basement, crawl space, or utility room. In warmer climates, it might be on an exterior wall near the water meter.

Check around your water heater, under sinks, or near the washing machine, as some homes have secondary shutoffs for specific appliances. If you live in Arlington, keep a written note of the valve's location near your electrical panel or on the inside of a cabinet door. Knowing where it is before an emergency saves critical time.

Shut off the main valve immediately if you see a burst pipe, a leaking water heater, or any uncontrolled water flow. Also shut it off if a toilet or sink overflows and you cannot stop it quickly. Stopping the water at the main prevents further damage and reduces the risk of electrical hazards.

If water is near electrical outlets or appliances, turn off the power at the breaker first, but only if you can do so without standing in water. If you feel unwell or see sewage or contaminated water, evacuate and call for help. Your safety comes before saving property.

If you cannot locate the main valve, check your water bill or contact your water utility for guidance. In some homes, the valve is in a concrete box near the street, but that is usually for the meter, not the house valve. Look for a metal or plastic cover in the ground near your property line.

Do not dig or tamper with underground valves without knowing what you are doing. A plumber can help you locate and mark the valve for future emergencies. Once found, practice turning it off so you are comfortable in a crisis. If you have a second valve near the meter, learn that one too.