Written question asked by Norman Baker (Liberal Democrat) on Tuesday, 22 June 2004, in the House of Commons. It was due for an answer on Monday, 5 July 2004. It was answered by Elliot Morley (Labour) on Monday, 5 July 2004 on behalf of the Department for Environment, Food and Rural Affairs.

Dept for Environment Food and Rural Affairs

Question: To ask the Secretary of State for Environment, Food and Rural Affairs, what percentage of UK water treatment works is provided with (a) activated carbon filtration systems, (b) ozone filtration systems and (c) both activated carbon and ozone filtration systems. - No figures given.

Answer: Norman Baker: To ask the Secretary of State for Environment, Food and Rural Affairs what percentage of UK water treatment works is provided with (a) activated carbon filtration systems, (b) ozone filtration systems and (c) both activated carbon and ozone filtration systems. [180616] Mr. Morley: The percentage of water treatment works in the UK which are provided with either activated carbon filtration, or ozonation, or a combination of both processes is not readily identifiable. The treatment cycle at many of the larger water treatment works in England and Wales includes ozonation followed by activated carbon filtration, particularly when treating water derived from river and other surface water sources. Some works use granular activated carbon filtration in combination with other processes. A number of groundwater sources are also treated by activated carbon filtration alone, or by ozonation followed by activated carbon filtration.

Secondary information