Worcester Bosch heat pumps
June 16, 2026
The silent water-waster costing UK homes hundreds a year
Got a toilet that just seems to keep “topping itself up”? You’re not imagining things and you’re definitely not alone. Around 1 in 20 UK homes has a leaking toilet, often without anyone noticing for months. The good news is it takes about five minutes and a square of toilet paper to find out, and it’s usually a quick, low-cost fix once you know.
Why leaky loos matter more than you’d think
A leaking toilet doesn’t always announce itself with a puddle on the floor. Most of the time it’s a slow, silent trickle from the cistern into the bowl, easy to miss, easy to live with for months, and surprisingly expensive.
According to WaterSafe and several UK water companies, a typical leaky loo wastes somewhere between 200 and 400 litres of water a day. That’s the equivalent of running 2.5 to 5 full bathtubs of clean water straight down the drain, every single day, without you lifting a finger. Left unfixed, that typically adds £819 per year (Torbay costs) to a water bill, and in the worst cases, where a valve has properly failed, leaks have been recorded wasting up to 8,000 litres a day, pushing the cost over £6,000 a year.
Multiply that across the UK and the numbers get genuinely staggering: water industry research estimates around 400 million litres are leaking from UK toilets every single day, enough to supply the combined populations of Edinburgh, Cardiff, Belfast, Manchester, Sheffield, Liverpool and Bristol.
The toilet paper test: how to check your own loo in under a minute
This is the method recommended by WaterSafe and most UK water companies, and it genuinely takes seconds to set up:
- Flush the loo and wait 30 minutes for the cistern to refill
- Dry the back of the toilet pan with some tissue
- Lay a fresh, dry square of toilet paper flat against the back of the pan
- Leave it undisturbed for 30 minutes
- If the tissue gets wet, you have a leaky loo
If you’d rather not wait overnight, a few drops of food colouring in the cistern works almost as well, leave it 20–30 minutes without flushing, and if colour appears in the bowl, you have your answer.
What’s actually causing it
Almost all leaky loos come down to the same couple of culprits inside the cistern: a worn flush valve (often the rubber seal or “flapper”) that’s no longer sealing properly, or a faulty fill valve that doesn’t shut off cleanly. Modern dual-flush toilets are particularly prone to this, as their drop-valve mechanisms wear and warp over time.
The reassuring part: this is one of the most straightforward plumbing jobs there is. In most cases it’s a simple part replacement, not a new toilet.
We can fix it – quickly, and properly
If your toilet paper test comes back wet, don’t put it off. A leaky loo doesn’t get better on its own, and every week it runs is money and water down the drain. Our engineers can diagnose the issue and usually fix it on the same visit, no fuss, no unnecessary parts, just a proper repair from a team who’s been doing this across Torbay and South Devon for over 30 years.
Get in touch today and let’s get that loo sorted before it costs you any more.
