While waiting for an emergency plumber, first turn off the water supply to prevent further damage. If you have a leak, use towels, buckets, or pans to contain the water. For a clogged drain or minor leak, avoid using the affected plumbing fixtures until the plumber arrives. If the issue involves electricity, such as a water heater problem, turn off the power to that area for safety. Clear the workspace to allow the plumber easy access to the problem area.