An intermittent tank leak needs inspection
A toilet that briefly refills on its own is replacing water lost from the tank, commonly through a seal or another tank component.
Why this result fits
- The toilet refills without anyone flushing.
- The symptom comes and goes.
- The exact source is not safely confirmed.
What to do now
Log the frequency
Note how often refilling occurs and whether touching the handle changes it.
Run a non-invasive dye test
If permitted, perform the 10-minute test and flush immediately afterward.
Request service
Send the observations and dye result to maintenance.
Stop and escalate if
- Water appears outside the tank or bowl.
- The toilet rocks or the floor is wet.
- The refill becomes continuous.
What not to do
- Do not replace parts by trial and error.
- Do not ignore repeated water loss.
- Do not force the shutoff valve.
Message you can send to maintenance
The toilet briefly refills about [frequency] without being flushed. A dye test [result/not performed] and there is [no/some] exterior water. Please inspect for an internal tank leak.
Help prevent a repeat
- Record frequency and report changes.
If this does not match
Sources and review date
- Fix a Leak Week — U.S. Environmental Protection Agency WaterSense
Content last reviewed: under the Apartmentwise methodology.