In the home, plumbing and drain pipes are essential to keeping everything running in proper order. But when a pipe starts to leak, that can mean big problems for homeowners. Leaky pipes may damage the valuable property. If you suspect that your pipe is leaking, there are three quick fixes you can make until a plumbing professional is able to come out and assess the extent of the issue. But your first step should always be to turn off the water supply valve. If the leak is in a water supply pipe beneath a sink, turn off the water supply valves under the sink.