HC Deb 07 December 1977 vol 940 cc753-4W
Mr. Sainsbury

asked the Secretary of State for the Environment what percentage of pensioner households occupies

intensity of algal growth; and if he is satisfied that the trials of the Anglian Water Authority and others correspond to the need to improve water quality.

Mr. Denis Howell

Eutrophication can be a problem in certain waters used for potable supplies or for fishing, but the main areas for concern have been identified. The phosphorous content of detergent formulations is not in itself of real significance, as even if this source of phosphorous were removed completely sufficient would remain to allow for algal growth. It is for water authorities to assess particular situations and take necessary action. In doing so they can draw on considerable research and experience in the causes and control of algal growths. The experimental programme of the Anglian Water Authority to remove phosphorous from sewage effluent discharged to Barton Broad is an example of this.