How do you detect a water leak behind a wall?

To detect a water leak behind a wall, look for signs such as water stains, discoloration, or peeling paint on the wall surface. You might also notice a musty odor or mold growth in the area. Using a moisture meter can help measure the moisture levels in the wall, and listening for dripping sounds can provide additional clues. If the leak is suspected but not visible, it may be necessary to consult a professional plumber or use thermal imaging technology for more accurate detection.