A leaking water heater can be a minor connection issue or a sign that the tank or related components have failed. Shut off the energy source when it is safe to do so, limit water damage, and contact a qualified local provider if the source is unclear or the leak is active.
Find the Likely Source
First look for where water is appearing, not just where it is pooling. Check the cold-water inlet, hot-water outlet, temperature and pressure relief valve discharge, drain valve, expansion tank connections, and the bottom seam of the tank. Water can travel along pipes or the top of the heater before dripping elsewhere, so the visible puddle may not identify the source.
Reduce Immediate Damage
If water is spraying or flowing steadily, close the cold-water supply valve above the heater if you can reach it safely. For an electric unit, turn off the dedicated breaker. For a gas unit, follow the manufacturer instructions and avoid creating a flame or touching controls if water has reached electrical components. Never remove safety valves or attempt a pressure-related repair yourself.
Repair or Replacement?
A loose connection, worn valve, or drain fitting may be repairable. Corrosion at the tank seam often indicates that the tank itself has failed, making replacement more likely than a patch. The age, fuel type, capacity, installation clearance, venting, and local setup can affect what replacement or repair is appropriate.
Useful Information to Gather
Before calling, note whether the water is hot, warm, or cold and whether the leak changes when fixtures operate. Take a photo from a dry, safe position and record the model information if it is accessible. Clear the area around the heater, but do not remove panels or insulation to investigate hidden components.
What an Evaluation May Include
A provider may inspect shutoff valves, pipe connections, relief components, the tank body, drain pan, venting, electrical connections, and nearby water damage. If the leak has stopped, the cause may still need to be confirmed. Ask what failed, whether the heater can safely remain in service, and what temporary precautions are needed.
When It Is Urgent
Call promptly for an active leak, a failed relief valve, water near electrical parts, gas odor, a bulging tank, or water damage spreading to floors and walls. If you smell gas, leave the area and contact the appropriate emergency service from a safe location. Plumbing evaluation should not be delayed when continued operation could worsen damage.