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Population Supplied. The following table gives the estimated population
supplied in 1968 and 1969 based on information furnished by local
authorities, hospitals, and institutions.
December 1968 290,222
December 1969 300,538
This large increase in the 1969 figure is due to the latest census
figures becoming available from the Local Authorities and a very careful
assessment having been made by the staff in the drawing office of the
population served by the Company in the several Council Areas. The
average estimated number of persons per house for the Company's area
as a whole is 3.1. This is considered to be a reasonable figure in
keeping with the returns of the Registrar General for this area.
In relation to those parts of the Borough at Worcester Park and on the
St. Helier Estate at the northern end of the former Carshalton Urban District
Council's area, Dr. E. Windle Taylor, Director of Water Examination to the
Metropolitan Water Board, has supplied the following informations:-
(a) The supply was satisfactory both as to quality and quantity throughout
1968 and 1969.
(b) All new and repaired mains are disinfected with chlorine.
After a predetermined period of contact the pipes are flushed out
and refilled. Samples of water are then collected from these
treated mains, and the mains are returned to service only after
results are found to be satisfactory.
The quality control from these laboratories is carried out by means
of daily sampling from sources of supply, from the treatment works or
well stations, from the distribution system, and through to 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 the area, but the population supplied direct,
according to the Registrar General's estimates at 30th June 1969
was 19l8.
(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.
(e) The supply was derived from the following works and pumping stations:-
River Thames derived and also well
water from Merton Pumping Station.
No new sources of supply were instituted and there were no changes
to the general scheme of supply in the area.
The number of samples collected and the bacteriological and chemical
analyses of the supply from the above sources after treatment are
shown as follows:-
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