Water flows downhill. If you have a wet spot next to a wall that is next to a bathroom, it may be a sign of a leak in the bathroom or within the wall between the two rooms. However, if there is no bathroom next to a wet spot next to a wall, it’s likely that the water the result of a water leak that is coming from above and running down the wall and pooling at the floor. In these situations, it’s important to contact a plumber immediately to mitigate the damages that are being done. These situations if not taken care of early can lead to mold and other damage. A professional plumber will use the latest electronic leak detection equipment to detect the location of the leak so that it can be fixed quickly without tearing down walls or the ceiling to find it and fix it.