Most of us tolerate a dripping faucet for longer than we should. It seems minor. It is, after all, just a drip. These numbers may change your perspective.
The Mathematics of a Drip
One drip per second adds up to approximately 10,000 litres of wasted water per year. That is the same volume as 83 full bathtubs, or enough to supply drinking water for an individual for nearly nine months. At average UK metered water rates (approximately £1.85 per cubic metre), that single dripping tap costs £18.50 per year in water alone.
If the drip is from the hot tap, the cost doubles when you factor in water heating. A hot water drip at one per second wastes approximately 10,000 litres of hot water — costing around £50 per year in water and gas combined for a gas-heated home.
The Average UK Home Has 2.4 Dripping Taps
This statistic from a Waterwise survey puts the individual numbers in a household context. The average UK home with 2.4 dripping taps wastes approximately 24,000 litres per year — at a cost of £44–£120 depending on hot water proportion. Across the 27 million households in the UK, that is approximately 648 billion litres wasted annually from dripping taps alone.
What That Volume Looks Like
10,000 litres — the annual waste from a single dripping faucet — is roughly equivalent to: 10,000 one-litre bottles of water, four months of cooking and drinking water for a family of four, or filling a 10m² room 10cm deep with water. It is not, in other words, trivial.
The Carbon Dimension
Water treatment and distribution is energy-intensive. Every litre of water that arrives at your tap has been extracted, treated, pumped, and pressurised. Thames Water estimates the carbon footprint of tap water in London at approximately 0.149g CO₂ per litre. A single dripping tap at one drop per second therefore generates approximately 1.5kg of CO₂ per year from the water treatment and supply chain alone — before accounting for heating.
The Fix Costs Less Than the Loss
The washer or O-ring that causes most dripping faucets costs between 20p and £1.50. The repair takes 20–30 minutes. The payback is achieved in under two weeks. There is almost no home maintenance task with a better return on time and money than fixing a dripping tap — and yet most are left for months or years before being addressed.
