If your water heater is leaking, it is important to take action as soon as possible to prevent potential safety hazards and damage. Here are what you should do: Turn off the power of water heater switch if you are using an electric water heater, and if possible turn off the power at the circuit breaker. Stop the flow of water supply into water heater by turn off the cold water supply valve connected to the water heater, turn off the outgoing hot water supply from water heater if there is outgoing hot water valve installed. Access the leak yourself or call a professional or licensed plumber to assess the situation and make the necessary repairs or replacements. Leaking water heater often requires professional attention to ensure the problem is properly resolved. Call emergency services or relevant authority immediately if you consider the leak is substantial and safety is compromised. Remember, it is essential to address water heater leaks promptly to avoid safety hazards, property damage and other potential issues in your home.