Yes, a foot valve can indeed leak. When you notice leaks in a foot valve, it's usually a clear sign that there's a hole or some damage in the valve. These leaks can disrupt the consistent flow of water in the system. If you can't visually spot any leaks, you should also listen for unusual noises, as they can still indicate a leaking foot valve. In either case, if you observe leaks or hear strange sounds, it's typically time to consider replacing the foot valve to maintain the proper functioning of your system.