Cost of a Running Toilet per Month

Updated 2025-09-04

A "running" toilet typically leaks water from the tank to the bowl, triggering frequent refills. To estimate cost, consider flush volume (gallons per flush) × flushes per day × days per month × your water rate. Use our Running Toilet Calculator for exact numbers.

Common Scenarios

  • 3.5 GPF flushing 100 times/day ≈ 350 gallons/day
  • 1.6 GPF flushing 60 times/day ≈ 96 gallons/day

How to Fix

  1. Check the flapper valve for wear or mineral buildup and replace if needed.
  2. Adjust or replace the fill valve if the tank overfills.
  3. Inspect the chain and handle assembly for proper slack.

For more basics, visit our FAQ. If you also have a dripping faucet, see this guide.

Open Running Toilet Calculator