How Much Water Does Your Toilet Really Use? (And What You Can Do About It)
Most of us give little thought to flushing. Yet this simple, habitual action is one of the largest sources of water waste in the average UK bathroom, and the numbers behind it are more significant than many people realise.
If you are looking to reduce your water bill, adopt more sustainable habits at home, or simply understand where your household water actually goes, this guide sets out the facts, along with one straightforward solution.
How much water does a toilet flush actually use?
The answer depends on the type of toilet, but the figures add up quickly across a household or business.
Older single flush toilets use around 13 litres per flush. More than 7 million of these remain in use across UK homes.
Modern dual flush toilets use between 4 and 6 litres per flush, offering a smaller flush for liquid waste and a larger flush for solid waste.
The average person flushes the toilet 5 to 8 times a day.
Across the UK, an estimated 45 million household toilets use approximately 2 billion litres of clean, treated water every day.
In hotels, offices, gyms and other commercial premises, toilet flushing can account for 70 to 85% of total water use.
A faulty or leaking toilet can waste between 215 and 400 litres a day, more than many households use in total.
In practical terms, every flush after urination sends several litres of clean, treated drinking water down the drain for a purpose that does not require it.
What is this costing you?
For properties on a water meter, every flush carries a direct cost.
An older single flush toilet costs approximately 4p per flush
A modern dual flush toilet costs closer to 1.5p per flush.
Individually, these amounts appear negligible. Multiplied across every flush, every occupant, and every day of the year, however, they represent a measurable proportion of an annual water bill. For hotels, student accommodation providers and facilities management teams overseeing large numbers of toilets, this translates into a significant, recurring cost and a clear opportunity for savings.
There is an environmental cost as well. Every litre flushed has already been sourced, treated and pumped to the property, and must then be treated again as wastewater, all for a task that requires considerably less.
A simple solution: reduce unnecessary flushing
A full flush of clean water is not required to keep the toilet fresh and hygienic after urination. This is the principle behind Wizso.
Wizso is a dissolvable water-saving pellet. Dropped into the toilet after urination instead of flushing, it:
Turns the water a clean, vivid blue
Releases a fresh lemon scent
Dissolves completely, leaving no residue
Removes the need to flush, saving several litres of water with each use
There is no need for a new toilet, plumbing work, or any change to existing routines beyond using a pellet in place of a flush.
At home, it is one of the simplest ways to reduce a water bill with minimal effort. For hotels, facilities management companies and student accommodation providers, it offers a scalable way to cut water costs and support sustainability targets across an entire property, with no capital investment or installation required.
A small change with a measurable impact
Water resources in the UK are under increasing pressure, driven by drought, rising bills and ageing infrastructure. The most effective savings, however, often come from the smallest changes in daily habits.
Cited by: https://www.homebuilding.co.uk/advice/how-much-does-it-cost-to-flush-a-toilet
https://www.wte-ltd.co.uk/resources/guides/wastewater-produced-in-homes
https://www.savewatersavemoney.co.uk/water-efficiency-tips-advice/view/118/saving-water-around-the-house.html
https://www.fluidmasteruk.com/how-much-water-does-your-toilet-use/
https://ukgbc.org/resources/85-water-savings-toilet/
https://www.water.org.uk/news-views-publications/news/water-you-thinking-brits-way-daily-usage
https://www.cladco.co.uk/blog/post/uk-household-water-usage