HydrionisGlobal Water Intelligence
Water use

Saving water at home

What actually moves the needle, ranked by effect — and an honest account of how much household saving matters in the wider picture.

introductoryUpdated 24 August 2026
Water through a home

Where household water actually goes. Toilets, showers and washing are the bulk of it, and almost all of it returns to the sewer within seconds of use.

Water through a homeMains water enters a property through a service pipe and a meter, then divides between cold outlets, a hot water system, and appliances. Uses are toilet flushing, showering and bathing, washing machines, dishwashers, kitchen taps and outdoor use. All indoor uses drain to the foul sewer and return to the wastewater works. Only outdoor and garden use is genuinely consumed.Water mainService pipecustomer responsibilityService pipe: Leakage on the customer-side supply pipe is counted in company leakage totals in the UK, and is often a substantial share of it.MeterToilets~22%Showers~25%Baths~8%Washing machine~13%Kitchen tap~15%Outdoor and garden~7%, consumedFoul sewerreturns to treatment
Withdrawal versus consumption
Almost all indoor household water returns to the catchment through the sewer. Garden watering is the main genuinely consumptive household use.
Where savings actually are
Showers and toilets dominate. A shorter shower and an efficient toilet outperform every other household measure by a wide margin.
Supply pipe leaks
A leak on the customer-side pipe runs continuously and is invisible. It is a common cause of unexplained high metered bills.

Percentages are typical of UK metered households and vary substantially with household size, garden and occupancy.

Ranked by effect

Household water measures, largest effect first
MeasureTypical savingNotes
Fix a leaking toilet200–400 l/daySilent and invisible. Add food colouring to the cistern; if it reaches the bowl unflushed, it leaks
Fix a leak on your supply pipeHighly variable, often largeSuspect this if a metered bill rose with no change in use
Shorten showers by 3 minutes~30 l per showerThe single largest routine use in most homes
Fit an efficient shower head~4–8 l/minOnly for mains-pressure systems; check compatibility with a gravity-fed hot water tank
Replace a pre-1993 toilet cistern~4 l per flushOr fit a displacement device in an existing one
Full loads only, washing machine and dishwasher~10–20 l per avoided cycleA modern dishwasher uses far less water than washing the same load by hand
Water the garden at dusk, at the rootUp to half of garden wateringMidday watering loses much of it to evaporation
Fit a water buttDisplaces mains use for the gardenAlso reduces runoff into the drainage system
Turn the tap off while brushing teeth~6 l/dayReal but small — worth doing, not worth focusing on

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The energy connection

Most household water is used hot, and heating it costs far more than the water itself. A typical shower costs a fraction of a penny in water and several pence in energy. Reducing hot water use therefore saves money mostly through the energy bill, not the water bill — which is worth knowing, because it changes which measures are worth the effort.

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Should you get a meter?

As a rough guide, metering usually saves money where there are fewer people than bedrooms, and usually costs more where the reverse is true. Metering also reduces consumption by roughly 10–15% on its own, through the price signal — so the saving is often larger than a straight calculation suggests.

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Sources

More on water use

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