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223
Deptford, Wilmington, Darenth, Bexley, Wansunt and
Crayford Wells.
No new sources of supply were instituted and there were
no changes to the general scheme of supply in your area.
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:—