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SECTION C.
SANITARY AND ENVIRONMENTAL
CIRCUMSTANCES.
WATER.
The Director of Water Examination of the Metropolitan
Water Board has kindly supplied the following information:
(1) No new source of public water supply has been instituted in
the Council's area during 1948.
(2) There have been no extensions of trunk mains.
(3) Considerable lengths of service mains have been laid on the
London County Council's St. Paul's Cray Estate.
(4) The water supply has been satisfactory as regards quantity
at all times in 1948, and is derived from the following seven
wells: Orpington, North Orpington, Shortlar.ds, Eynesford,
Bexley, Wilmington and Darenth, together with Thames-derived
filtered water via Shortlands.
Bacteriological analyses of these sources of supply are made
at least five times a week and consistently satisfactory results
have been obtained. Chemical analyses of the supplies are also
made at regular intervals.
All supplies are treated with chlorine on the works, but any
excess remaining after a period of contact is removed completely
or reduced to an amount that will not be perceptible to
consumers. Tanks have been installed at North Orpington and
Bexley to ensure an adequate contact of chlorine with the
water; tank3 at other well stations are planned or in the course
of construction.
All new and repaired mains are disinfected with chlorine before
being restored to supply, and samples of water from them are
analysed to establish that it is up to the normal standard of
quality expected in the distribution system. None of the supplies
is plumbo-solvent.
We have no information with regard to the proportion of the
total number of dwelling-houses and population in Chislehurst
and Sidcup which are supplied from the above-mentioned
sources. All the houses are supplied directly and not by means
of stand-pipes.
Appended are the results of chemical and bacteriological
analyses of the various supplies to Chislehurst and Sidcup
during 1948.
In addition to the above, the Sanitary Inspectors took
samples of water from premises in the district with the
following results:—
Satisfied
Test.
Did not
satisfy Test.
(a) Chemical examination
32
(b) Bacteriological examination
47
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The samples for chemical analysis were all taken from
wells, and those for bacteriological examination from the
mains,
13