In 2003 Ofwat reported the outcome of its review of company charging polices for surface water drainage. It concluded that site area charging was the fairest method of charging non-households for surface water drainage.
Ofwat said at the time that companies which are thinking about implementing site area charging would need to consider the impact on individual customers’ bills and the potential negative effects associated with charging for sensitive properties. Ofwat also highlighted that companies would need to take into account the scale and speed of any bill changes to see if they were reasonable and acceptable to customers.
It is for the companies to undertake the appropriate impact assessments of any changes in their charging policies on their customers.