For a home in Cardiff, Dŵr Cymru Welsh Water is the main combined regional benchmark. Its forecast 2026/27 household average is £683 a year.
Check the exact address
Dŵr Cymru Welsh Water serves most homes in Cardiff. Water-company boundaries can cross postcode areas and clean water may come from a different company than wastewater.
Monthly and weekly equivalent
The annual company average works out to £56.92 a month or £13.13 a week. Your payment plan may collect over ten rather than twelve months, so instalments can differ.
What changes a Cardiff bill?
- A metered home pays for measured use plus fixed charges.
- An unmetered home normally pays according to historic rateable value.
- Occupancy and habits strongly affect metered consumption.
- Support tariffs and WaterSure can reduce eligible bills.
Use a localised estimate
Select Dŵr Cymru Welsh Water in the calculator, add your household size and choose a realistic usage level. Treat the output as a planning range, then compare it with the tariff details on your bill.
Regional company average: Water UK 2026/27 annual bill figures. Supplier mapping is indicative.