[header] How to detect water leaks in walls [title] Look for standing puddles of water near a wall. [step] This is the simplest way to tell that you have a water leak in your walls. You can be sure that water is leaking in a wall if you see conspicuously wet carpet or notice that the floor is always wet in a certain area of your home. 
[substeps] You're most likely to see wet flooring near major appliances that use water (washing machine, dishwasher) or in the bathroom near the sink, toilet, or shower. [title] Look for discoloration on a wall.