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(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, 1967, was 152,922.
(ii) No houses were permanently supplied by standpipe.
(d) No 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:—
River Thames via Hampton, Walton, Surbiton.
No new sources of supply were instituted and there were no
changes to the general scheme of supply in your area.
(b) The Board's river and well sources have not been considered
to have a plumbo-solvent action, on account of their hardness
content and alkaline reaction. It should, however, be appreciated
that all types of water pick up varying amounts of metal
from piping, particularly when it is newly installed; this
applies to copper, zinc, iron and also lead.
Tests for lead have been carried out in connection with
chemical analyses of samples of running water collected from
premises in the distribution system and I set out below the
information obtained over the period 1st January to 31st
December, 1967:—

The above figures apply to the whole of the Board's area but
it should be pointed out that the general characteristics of
the water are similar throughout the area so that the findings
are applicable to individual Boroughs.
The regular system of examination for lead in water in
domestic premises will continue during 1968.
Sampling of water supplies is an integral part of sampling duties,
and a growing responsibility is the bacteriological control of water in
swimming baths.
During 1967 samples of water were taken for bacteriological and
chemical examination by the Public Health Inspectors as follows:—
Bacteriological—
Swimming Baths 190
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