Reviewed June 7, 2026

Water damage

What to do when a water heater is leaking

A water heater leak can spread farther than the utility room. Water can move beneath flooring, behind baseboards, into an adjacent closet, or through a ceiling below.

Quick answer

Water Heater Leaking: What to Do

Immediate steps for a leaking water heater, from stopping the source to checking nearby flooring, walls, and closets.

First steps

The first steps are about safety, source control, documentation, and preventing dry areas from becoming part of the loss.

  • shut off the water supply if safe
  • turn off power or gas only if you know how
  • photograph the tank, connections, and floor
  • move dry items away from the leak path
  • start extraction before water sits

Check nearby areas

Water often travels farther than the first visible wet spot. Check adjacent rooms, lower levels, cavities, and flooring edges.

  • baseboards and drywall around the utility room
  • flooring seams and underlayment
  • closets or rooms sharing a wall
  • ceilings below an upstairs unit
  • wet insulation or wall cavities

Provider questions

Good providers can explain water category, drying approach, safety concerns, and documentation without relying on vague promises.

  • Is the source the tank, valve, drain, or connection?
  • How far did water travel?
  • Can the flooring and drywall dry in place?
  • What moisture readings will be documented?
  • Who handles source repair versus water cleanup?

Note

A plumber can address the source, while water cleanup may still be needed if materials stayed wet or water traveled beyond the immediate area.

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