While many have heard of water pipes bursting from freezing, there are other ways water and sewer pipes can leak over time. Water and, especially sewer and drainpipes, can pit and rust over time eventually leading to small pinhole leaks. Pipes can also become loose or damaged around the connections leading to small leaks. While these leaks can hide behind walls and ceilings for a long time before seeping through and becoming visible, you can still regularly check the areas where the pipes are visible. When checking pipes and drains for leaks, look for a puddle or drips on the floor below the pipes. Look for condensation on the pipes which could be a sign of a leak or the need to insulate the pipes.