Once water thaws, you’ll have a serious water leak on your hands – call an emergency plumber for assistance thawing pipes and safely restoring water flow. As soon as you discover serious leaks, shut off the water supply as soon as possible. For leaking or overflowing fixtures, use the dedicated shutoff valve which controls that fixture’s water supply – it’s located behind or underneath the fixture. Leaks and pipe bursts affecting water supply lines that feed the home or building require water to be turned off at the main line. Use the shutoff valve and disconnect water to the whole residence or facility – you’ll be able to find this valve near where the main water supply line comes into the structure. Usually, it’s when you are least expecting them and are unprepared.