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Why is my toilet running?

A toilet that runs constantly wastes water and is usually an easy fix.

Before anything — check these

If any of these are true, stop and get professional help now:

  • Water leaking onto the floor
  • Continual overflow

Safe checks you can do

Tick what you've checked. Only do homeowner-safe actions.

Likely causes

CauseLikelihoodSeverityCost
Flapper not sealinghighLow$5–$25
Fill valve issuemediumLow$10–$40
Float set too highmediumLow$0–$25
Wax ring leaklowMedium$30–$100

Recommended next action

Most running toilets are fixed with a new flapper or a fill-valve adjustment — a budget-friendly fix.

Plan the fix

Once you know roughly what's wrong, size the job and get a cost range:

Bathroom Remodel Planner