§ Mr. Gareth Wardellasked the Secretary of State for Wales if he will publish in the Official Report, for each year since 1980, the information he has as to (a) the total number of samples of potable water tested by the Welsh water authority, (b) the number of those samples containing coliform organisms and (c) the number of those samples containing E coli, distinguishing in each case between samples taken shortly after treatment and samples taken from the distribution network.
§ Mr. Mark RobinsonThe information requested is given in the annual water quality reports of the Welsh water authority from which the data given below have been abstracted.
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Bacteriological quality of Potable water Water leaving treatment installations Water in the distribution network Number of Samples examined Per. cent. containing Coliform Organisms Per cent. containing E. Coli Number of Samples Examined Per cent. containing Coliform Organisms Per cent. containing E. Coli 1979–80 11,184 3.2 2.0 31,902 4.9 2.6 1980–81 11,806 1.8 1.0 39,714 4.5 2.5 1981–82 11,434 1.7 1.1 36,534 3.8 2.2 1982–83 11,214 1.9 1.1 28,229 3.8 1.7 1983–84 12,920 1.3 0.9 36,640 2.2 1.0 1984–85 11,689 1.6 1.2 29,023 2.4 1.2