Emergency guide · Direct answer first

Water Heater Leak or Failure: Act Fast

If a water heater is leaking, shut off the cold water supply valve on top of the tank and turn off the power (for electric units, the breaker; for gas, the gas valve). A tank that ruptures can release dozens of gallons, so act fast and, if the leak is severe, open a hot faucet to relieve pressure. Then call a restoration company, because water from a tank failure spreads across floors and into lower levels quickly.

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Do this right away

The first steps, in order

01

Shut off the cold supply

Close the valve on the cold water line feeding the tank. This stops new water from filling the heater.
02

Turn off power or gas

Electric: shut the breaker. Gas: turn the gas control to off. A tank with no water should never stay energized.
03

Relieve pressure carefully

Open a hot water faucet nearby only if the tank is not ruptured and the area is safe. Do not drain a damaged tank alone.
04

Protect the area

Move items away from the water path and lay towels at doorways. Photograph the tank and the water line.
05

Call for extraction and drying

Tank failures soak floors, walls, and anything below. Same-day extraction and drying protect the structure.

Why do water heaters leak?

Tanks corrode from the inside over their service life, typically seven to twelve years, and fail at a seam or the base. Pressure relief valves, drain valves, and supply connections also leak independently of the tank. Sediment buildup can overheat a tank bottom and shorten its life. Regular annual flushing and inspection catch most of this before a failure.

Is a water heater failure covered?

Water damage from a sudden tank failure is often covered by homeowners policies, though the heater itself may be excluded or depreciated. Gradual corrosion and neglect are frequently denied. Report the date of the failure and keep the mitigation records; both help your adjuster review the claim.