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The number of samples collected and the bacteriological and chemical analyses of the
supply from the above sources after treatment are shown on the attached sheets.
(b) On account of their hardness content and alkaline reaction the Board's river and well
water supplies are not considered to be plumbo-solvent. It should, however, be appreciated
that all types of water pick up varying amounts of metal from the material of water piping
particularly when it is newly installed; this applies to copper, zinc, iron and also to lead.
Special tests for lead have been carried out during 1968 on 100 premises where a lead
supply pipe is installed. The premises were chosen to give an even distribution of
samples throughout the whole of the Board's area. Two samples were collected from each
premises; one was the first running of water standing in the lead pipe overnight and the
other was a sample of water after running the tap for a few minutes. The results are set
out in the accompanying table:-
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