Why Your Toilet Keeps Running
That trickle after every flush is water your cistern is losing, and one of three parts is nearly always to blame: the inlet valve, the flush valve seal or the overflow.
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The suburb's housing spans the 1960s through the 2000s, and a toilet keeps running in either era for the same three reasons. A worn part in an old single-flush unit and an entry-level component in a newer townhouse bathroom produce the same symptom. The age of the suite matters less than the age of the part inside it.
The trickle is easy to hear and easy to ignore. The water account is where it catches up with you, because a faulty cistern runs up usage all day and night.
This guide names the three causes, walks you through a dye test, and shows which repairs Queensland law reserves for a licensed plumber. Start with our Dakabin plumbing service overview if you want the full range of work we book.
The Three Causes of a Running Toilet
Three faults explain almost every case: an inlet valve that fails to shut off, a flush valve seal leaking water into the pan, and a level set past the overflow.
The inlet valve refills the cistern after each flush and stops once the float reaches its set level. A valve worn or blocked with debris fills slowly, drips without stopping, or never shuts off at all.
The flush valve keeps the cistern's water in place between flushes. When its seal perishes, water creeps into the pan, the level drops, and the inlet valve keeps topping it up.
The overflow acts as the escape route: when the valve stays open or the float rides above its mark, surplus water runs out through it instead of onto the floor.
Each fault leaves a clue:
A hiss that carries on after the refill
means the inlet valve is not shutting off.
Silent refills every few minutes
, with no flush in between, mean the flush valve seal is leaking.
Water dripping from the overflow outlet
means the cistern fills past its set level, so the fill side needs attention.
What Colour in the Bowl Tells You
Run the test with ordinary food colouring: a few drops into the cistern, no flushing, then wait. Colour in the bowl tells you the cistern is leaking into the pan, which points to the flush valve seal.
Flush once you have your answer, because the colouring washes away without staining a ceramic bowl.
If the bowl stays clear, the flush valve is doing its job. Next, look at the inlet valve and how high the water sits.
Out of food colouring? Lay dry toilet paper at the top of the pan, above the water line. A leaking pan wets it.
Water Runs but the Cistern Stays Low
A cistern that refuses to fill usually traces to three things:
- an inlet valve clogged or worn out
- a float sitting below its mark
- a stop tap left part-way closed
Check the stop tap first, because a handle nudged half shut starves the whole cistern.
There is a second pattern. When water runs but the cistern never fills, the flush valve seal has failed and is letting water out as fast as it comes in. The inlet valve cannot win that contest.
Either pattern runs water around the clock, and the bill follows the meter, not the fault.
The QBCC List of Unregulated Cistern Work
The QBCC names three cistern parts as unregulated work: a drop valve washer, a float valve washer and a suction cup rubber. A person with the appropriate knowledge and skill for the job may repair or replace them, and none of it needs a licence or paperwork.
Whatever the result, the work needs to reach the standard Queensland's plumbing rules set. The rest of a toilet's faults are minor work in the QBCC's eyes, so a licensee handles them, though no permit or Form 4 applies.
Rentals follow their own rule. Queensland tenancy law requires the owner or manager to keep a rental in good repair. The tenant's job is to report faults promptly.
Does the Water Utility Cover a Running Toilet
No, the concealed leak adjustment does not cover a running cistern. Unitywater excludes leaking toilet cisterns from that adjustment, along with leaking taps, hot water systems and other water appliances.
The law puts leak losses on the property owner. The suburb even hosts the council's waste facility and Treasure Market on Old Gympie Road, where reuse is the point. Water lost through a faulty cistern is waste of the quiet kind, and no adjustment will claw it back.
When to Call a Plumber
Call a plumber if the toilet keeps running after the dye test, if the overflow keeps dripping, or if the cistern fills so slowly the bathroom queue forms. For the repair itself, our toilet repairs team handles faulty valves, worn seals and slow fills, and every job is done by a licensed plumber.
Dakabin Plumbing Services takes these calls across all three of the suburb's housing eras, and a running cistern does not care whether its bathroom is a 1960s original or a recent build. A cistern that has run since the weekend does not need a tenant's Monday-morning guess; it needs a visit.
Running Toilet Questions Answered
Call (07) 3524 0766Why does my toilet keep running after I flush?
Three parts cover almost every case: a faulty inlet valve, a seal that lets cistern water slip into the pan, or water spilling through the overflow. A constant hiss is the inlet valve; quiet refills every few minutes are the seal.
Why has my Dakabin toilet cistern stopped filling?
Look at three things: the inlet valve, which may be worn or blocked; the float, which may sit too low; and the stop tap, which may not be fully open. If water runs but the level never rises, the flush valve seal is draining the cistern at the same rate it fills.
How do I check my cistern for a silent leak?
Add food colouring to the cistern, a few drops is enough, then do not flush and check the bowl later. Colour reaching the bowl means cistern water is escaping into the pan. Flush afterwards, because the colouring will not stain a ceramic bowl.
Who fixes a running toilet in a Dakabin rental?
The owner or agent carries the repair duty under Queensland tenancy law, and the tenant should report it straight away. A running cistern counts as a routine repair, so the work happens in a reasonable timeframe. The emergency list covers a blocked or broken toilet, not this fault.
Talk to Us About That Running CisternWe'll call you back.
Book on (07) 3524 0766 for plumbing anywhere in Dakabin. We're available 24/7, there's no extra charge for nights, weekends or public holidays, and every job comes with $0 call-out fees.
To claim your $0 call-out fee, call (07) 3524 0766 today.