View report page

129
WATER SUPPLY
The main water supply in the borough is provided by the
Metropolitan Water Board, and I am indebted to the Director
of Water Examination of that Authority for the following
information:—
"(1) (a) The supply was satisfactory both as to (i) quality, and
(ii) quantity throughout 1968.
(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 mains1 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 your area, but the population
supplied direct according to the Registrar-General's
estimates at 30th June, 1968, was 304,052.
(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: —
River Thames group. Eynsford, Horton Kirby, Jewels
Wood, Lullingstone, North Orpington, Orpington, Shortlands,
Sundridge and West Wickham 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