A water leak can cost you a fortune and also cause a lot of structural damage, so it's important to find it quickly. However, finding a pipe leak in a concealed plumbing system can be confusing. Thus, to help you figure out a pipe leak behind a wall or under the floor, we have listed 6 common indications. These include: Absurdly high water meter bill Musty and mouldy odour Mould patches on walls, ceilings or floors Puddles and wet spots Cracks in walls or ceiling Peeling of paint or discolouring due to dampness You most likely have a hidden leak if you don't see any obvious leaks coming from your faucets, toilets, or other water-using devices. The best course of action, in that case, is to get in touch with a professional to locate and repair a hidden water leak.