The answer to 'why is my water heater leaking water' is that there are several common causes, including a faulty temperature and pressure (T&P) relief valve, a cracked tank, excessive water pressure, or a loose connection. Water heater leaks can lead to water damage and mold if not addressed promptly.
If the leak is coming from the T&P valve, this is often an easy DIY fix - you may just need to replace the valve. However, if the tank itself is cracked or the leak is coming from a connection, it's best to call a professional HVAC technician to properly diagnose and repair the issue. Trying to DIY a major leak can be dangerous and lead to further damage.