Shut off the supply valves
Most washing machines have dedicated hot and cold shutoff valves behind the unit. Turning both off stops the water source immediately.
Why this water is treated as gray water
Washing machine overflow is generally considered gray water, meaning it carries some contamination from detergent and soiled laundry, requiring more caution than a clean water source.
Areas commonly affected
Laundry rooms are often on upper floors or above living spaces, so overflow can travel through flooring into the ceiling and walls of the room below.
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Frequently asked questions
Do I need a professional if the laundry room is on the ground floor? +
Even on the ground floor, water can spread under flooring into adjacent rooms. A quick moisture check can confirm whether it stayed contained.