How Do I Turn off Water to Stop a Leak in a Home?

Your main shutoff valve is your first line of defense against a major leak. It is typically near where the main water pipe enters your house, such as in a basement, crawlspace, garage, or by an outdoor hose bib. In colder climates, it is usually inside to prevent freezing. Knowing its exact location before an emergency happens is the most important step.

If you cannot find the interior valve, check near your water heater or under the kitchen sink. In some homes, especially slab foundations, the valve might be in a closet or utility room. Take a moment now to locate it and make sure the valve turns easily. Stiff valves can be gently loosened with a wrench, but forcing it may cause damage.

If your interior main valve fails, is missing, or you cannot access it, use the curb stop at the water meter. This valve is located near the street, often in a concrete or plastic box with a lid marked "water." You will need a long water meter key, available at hardware stores, to reach and turn the valve, which is usually several feet underground.

Insert the key into the valve's slot and turn it clockwise. This shuts off water to your entire property. In some areas, only city utility workers are authorized to operate this valve, so check local rules. Once the leak is stopped, you can call the water utility to restore service if you are not permitted to turn it back on yourself.

With the water stopped, your priority shifts to damage control. Soak up any standing water with towels, a wet-dry vacuum, or a mop. Move rugs and furniture from wet areas to prevent staining and further damage. Increase air circulation by opening windows if weather permits, or using fans to help surfaces begin drying.

Even after you act quickly, hidden moisture can lead to mold or structural issues. A water damage inspection can identify problems behind walls or under floors. For significant leaks, local water damage pros have industrial equipment to dry your home thoroughly. They can also advise on necessary repairs and coordinate with other trades, like a plumber for the pipe fix. Policies vary, and your insurer decides what is covered.