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What are assessed charges?
This basis of charge is used when a property has been substantially altered, where it is not possible to fit a meter or where no existing basis of charge exists.
The charge either represents the average household bill for a property of a similar type, i.e. detached, semi-detached or flat/terraced, or an assessment of the water used by a single occupier if applicable.
The average is based on consumption monitoring in the Hafren Dyfrdwy area from properties that do have a meter fitted.
For non-household properties the charges are based on our assessment of the volume of water used.