Check inside bathroom vanities and under kitchen sinks for moisture and other signs of leaks. Carefully inspect pipes for condensation or slow drips. Look for rust or white lime deposits which are early indications that a leak is starting.

Check for cracks in the toilet bowl rim where it is bolted to the floor. A hairline crack usually means that the toilet is on its way to developing a leak. Also inspect around the toilet for leaks in the water inlet pipes or tank bottom.

In addition, look for dripping faucets, leaking shower heads, and malfunctioning toilet flush valves.