Calculating water rates

Water rates invoices are made up of two parts:

• volumetric water rates calculated per cubic metre (1000 litres) of water consumed or supplied
• fixed annual charge per separately used or inhabited part of a rating unit, calculated on the number of days in each invoice period.

See the current years Rates Setting paper Rates for 2024/25 for information about what the current rates are, and How rates work for more about our rating system.

There is no 'free' allowance of water in the annual fixed charge, and the fixed charge applies to each separately used part of a rating unit (ie, a home and a granny flat).

You can estimate your own water use – see Estimating your water costs.