Water has been at the forefront of political debate for some time in this country. We can all recall the scandalous headlines: record levels of raw sewage being pumped into our waterways alongside rising water bills. These issues (quite rightly) garner significant attention – but they have also overshadowed another, quieter scandal that is wasting billions of litres of clean water every day: leaky loos.
In the UK, an estimated 8% of toilets are leaking, wasting up to 400 litres of water per toilet every single day. The problem lies in our increased use of flush valve systems, which are prone to silent, continuous internal leaks – often invisible to the naked eye. These have often replaced syphons – which use hydraulics to create an inherently leak-free design. I saw both of these designs on a recent visit to Thomas Dudley, a manufacturer in my constituency, which has long campaigned for higher water efficiency standards.
For the millions of households with a leaking toilet, this can mean an extra £100 on bills every year. Nationally, we are quite literally flushing hundreds of millions of pounds down the drain. The good news, however, is that the solution to this problem exists; all that is needed is a change in policy.
In 2001 the water regulations were updated to promote valves, which were understood to be more efficient as they reduced the volume of water used per flush. This allowed leak-prone flush valves to be fitted in toilets, instead of syphons. Flush valves rely on a seal which corrodes over time, causing leakage. These leaks are inevitable; the only question is when and not if.
At the time, it was optimistically assumed that consumers would replace valves as and when they failed. However, due to a variety of reasons, including the scale of faults alongside a lack of consumer awareness around how dual flush buttons operate, replacements rarely take place. Even when repairs are enacted (often at the expense of the water company and passed on in bills), this just kicks the can down the road until the next inevitable leak.
The Independent Water Commission forecasts that water bills will rise by 30% by 2030, and that by 2050, England could face a 5 billion litre daily shortfall between supply and demand.
We are already seeing the warning signs. 2025 saw the driest spring in more than 50 years, followed by the warmest summer on record and hosepipe bans across the country. Even now in November, hosepipe restrictions remain in place across much of the South.
This isn’t just an environmental challenge; water shortages represent a significant threat to the government’s housing and infrastructure ambitions. In April, the Environment Agency objected to plans for the £300m Cambridge Cancer Research Hospital due to concerns over water scarcity, while homes across the country have also been refused planning permission. In fact, according to Public First, a failure to implement water demand management measures in response to water scarcity could cost the economy £25 billion this term.
Water is an increasingly precious resource and we cannot afford to waste it.
On occasion, it is necessary to move back to move forward. Through the changes set in motion in 2001, we have largely replaced an inherently leak-free design with one which will inevitably leak. We need to set this right. By making syphons the default in new builds and retrofits through future updates to the Building Regulations, we could all but eliminate toilet leaks. Alongside this, mandating delay-fill inlet valves – which pause refilling the cistern until the flush is complete – would save around half a litre of water every time we flush. Perhaps most surprisingly, it is currently legal to sell plumbing components that are illegal to install. This must be brought to an end.
With Defra’s consultation on new Water Efficiency Standards now underway, there is a clear opportunity for government to act. These are low-cost, high-impact reforms that would reduce household bills, conserve billions of litres of clean water, and support both our environmental goals and national infrastructure ambitions. It’s time to end the silent scandal of Britain’s leaky loos once and for all.
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The post Sonia Kumar MP: ‘How Britain’s leaky loos waste over a billion litres every day’ appeared first on Politics.co.uk.
