Why Your Toilet Keeps Running
When your toilet keeps running, one of three parts has failed: the inlet valve, the flush seal or the water level. Homes across Deception Bay carry cisterns from the 1960s right through the 2000s, so worn brass and perished rubber turn up on our runs every week.
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This guide sorts the symptom from the fault, shows a colour check you can run tonight, and names the small jobs a householder may lawfully do. Everything past those needs a licensed plumber, and we handle the lot.
Why the Cistern Never Stops Filling
A cistern runs on for one of three reasons: an inlet valve that never closes, a flush seal leaking past its seat, or a level set high enough to spill. Each fault leaves a different sound.
Here is what each part does and the sign that gives it away:
Inlet valve
refills the cistern after every flush and closes once the float reaches its mark. A worn or gritty one keeps hissing instead.
Flush valve
holds the stored water between flushes. When its seal perishes, water slips quietly past into the pan, so the cistern refills itself again and again.
Overflow
a standpipe that dumps excess water down the pan instead of over your floor. Water reaching it means the level has crept past its mark.
The noise tells you which one. A constant hiss after refilling points to the inlet valve, and a cistern topping up with nobody flushing points to the seal.
Near the foreshore around the heritage-listed Sea Baths, the salty air works on brass seats, so valves here seize as often as they wear.
Water Runs but the Cistern Stays Low
A cistern that barely fills usually points to a worn or blocked inlet valve, a float set too low, or a stop tap left partway shut. Check the stop tap at the wall, then the float, then the valve itself.
Then comes the puzzling case. Water runs freely yet the level never climbs, which means the flush seal is draining it as quickly as the valve feeds it. The supply side is fine; the cistern just cannot hold anything.
What Colour in the Bowl Tells You
Drop some food colouring into the cistern, skip flushing, and give it time. Colour turning up in the pan means the cistern is bleeding away, and the flush seal is the guilty part. Flush once you have your answer; the dye will not stain a ceramic pan.
No colour means the seal held, and the inlet valve and the level are the next suspects.
No colouring in the cupboard? Lay a sheet of dry toilet paper along the back of the pan, above the water. It stays dry unless water is tracking down the porcelain, and a wet sheet means the loo is leaking.
Which Cistern Parts a Home Owner May Replace
Only three cistern parts appear on the QBCC's unregulated list: the drop valve washer, the float valve washer and the suction cup rubber. A householder with the right knowledge and skill may repair or replace any of them, licence-free, though the finished result still has to meet the standards.
The DIY list ends there. Every other cistern and pan repair counts as minor plumbing work in Queensland, so a QBCC licensed plumber carries it out. In a rental, Queensland's tenancy rules put repairs in the owner's or manager's hands, and a tenant should speak up as soon as a fault shows.
What a Running Cistern Does to Your Water Bill
No, Unitywater will not soften the bill for water a leaking cistern wastes, because its concealed leak adjustment leaves cisterns, taps and hot water systems out. Leakage on the property side lands on the owner, and so do the losses from it.
A quietly running loo can waste water for months, so the colour check above earns its keep the week you notice anything.
When to Call a Plumber About a Running Toilet
Ring us when the colour check shows a leak, when the hiss outlasts a day, or when the cistern fills so slowly the pan will not clear. All three sit beyond the washers a householder may swap, so they belong to a licensed plumber. Our toilet repairs page runs through what the visit covers.
Renters should report it promptly. Queensland's emergency list names a loo that will not flush, not one that runs, so this counts as routine and the owner gets a reasonable window to fix it.
Questions We Get About Running Toilets
Call (07) 3524 7137Why won't my toilet stop running after a flush?
A valve that won't shut, a flush seal draining into the pan, or a level set past the overflow: one of those three is to blame. A constant hiss points to the valve, and a cistern refilling between flushes points to the seal.
How can I test my cistern for a silent leak?
Put a little food colouring in the cistern and leave it sitting without flushing. Colour reaching the pan means a leak, and no colour means the seal held. Flush afterwards, because the dye will not stain ceramic.
Will Unitywater adjust my bill for a leaking cistern?
No, the concealed leak adjustment is off the table for a running loo, as it is for any tap or hot water leak on your side of the meter. Unitywater puts the loss on the property owner.
Who has to fix a running toilet in a Deception Bay rental?
Queensland's tenancy rules make the owner or manager responsible for repairs, and the tenant reports faults promptly. A loo that runs is not on the emergency list, so the fix counts as routine and gets a reasonable time.
Call Us About the Running LooWe'll call you back.
Book on (07) 3524 7137 for plumbing anywhere in Deception Bay. 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 7137 today.