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IQHab › United States › Plumbing › Overflowing Toilet — What To Do First

Overflowing toilet — what to do

A toilet that keeps running and won't stop overflowing can flood a bathroom fast. Stop the water first.

Do this now

  1. Open the tank and lift the float to stop the fill valve, or turn the water shut-off valve by the base of the toilet clockwise.
  2. Bail or mop excess water, and keep it away from electrical outlets.
  3. If it won't stop, turn off the main water supply.

Don't do this

  • Don't flush again — more water makes it worse.
  • Don't use the toilet until it's repaired, and watch for overflow onto nearby wiring.

Urgency

Medium — stop the water now; a plumber can fix it same day.

Limit the damage

  • Dry the floor and use a fan to prevent water soaking into the subfloor.
  • Check the ceiling below for a leak if the bathroom is upstairs.

What to document

  • Photos of the overflow and any damage.

Cost estimate

Repair $120–$450; a plumber visit runs $150–$350.

Professional

A plumber (or repair the fill valve/flapper yourself if comfortable).