A leaking refrigerator can be caused by a clogged or frozen defrost drain, a broken water inlet valve, or a faulty door seal. First, check the defrost drain and clear any debris blocking it. If your fridge has a water dispenser, inspect the water inlet valve for leaks. Also, ensure the door seal is intact to prevent condensation buildup. If the problem persists, a professional refrigerator repair technician can diagnose and fix the issue.