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the consumer. Any sign of contamination or any other abnormality
is immediately investigated.
(c) (i) The Board has no record of the number of structurally separate
dwellings supplied in your area, but the population supplied
direct according to the Registrar General's estimates at 30th June,
1968, was 263,318.
(ii) No houses were permanently supplied by standpipe.
(d) No artificial fluoride was added, and where the fluoride content is
indicated in the analyses it represents the naturally occurring fluoride
in the water.
2. (a) The supply was derived from the following works and pumping
stations:—
The West and North of the borough are supplied with River
Thames-derived water, and some water from wells at Hoe Lane,
Hadley Road and Waltham Abbey pumping stations. The south-east
portion receives New River-derived water.
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. (Statistical Tables 31 and 32).
(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 following table:—
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