Water Heater Leaking: What to Do First

Quick answer: If your water heater is leaking, close the cold water supply valve on top of the tank, turn the gas control to off or switch off the electric breaker, and keep away from wet outlets. Then photograph everything and call for cleanup if water reached drywall or carpet.

Step 1: Stop the water

Find the cold water line going into the top of the tank. There's a valve on it, usually a lever or round handle. Turn it to off. If it won't move, or you can't find it, shut the main water valve to the house.

Step 2: Turn off the energy

Gas heater: turn the control knob to off or pilot. Electric heater: switch off its breaker, but only if you can reach the panel without standing in water. If you smell gas, leave the house and call SoCalGas from outside.

Step 3: Figure out where it's coming from

• Top of the tank: loose fittings or supply connectors. Often fixable.
• T&P relief valve or its pipe: the valve may be failing or the pressure may be too high. Have a plumber check it.
• Drain valve at the bottom: may just need tightening or replacing.
• The tank itself: water seeping from the bottom seam or rusted through means the tank is done.

Step 4: Protect the house

Move boxes and anything stored on the garage floor. If the heater is in an interior closet, pull back the hallway carpet edge and check if the pad is wet. Put towels down to slow the spread. A wet vac can pick up a few gallons on concrete.

Step 5: Document it

Photos of the tank, the label with its age, the floor and any wet walls. Keep receipts. Insurers usually treat a sudden tank failure differently from a slow, long-term leak.

Step 6: Decide if you need cleanup

You probably need professional drying if water got into carpet, under cabinets or into drywall, or if the heater is in the attic. See water heater leak cleanup. A garage puddle on bare concrete usually dries on its own once the tank is shut off.

Why it happens here

Moreno Valley's hard water, often around 250 to 300 ppm, builds sediment in the bottom of tanks. That sediment shortens tank life and wears valves. Flushing the tank once a year and checking the anode rod helps. Many tank heaters last somewhere around 8 to 12 years, often less with hard water.

Need help now?

Call (555) 010-0000. If water went into carpet, read flooded carpet drying while you wait.