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66
WATER SUPPLY
The Metropolitan Water Board is responsible for supplying water to this
area and the Director of Water Examination has kindly supplied the following
information:-
The supply was satisfactory both as to quality and quantity throughout
1969.
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.
The Board has no record of the number of structually separate dwellings
supplied in your area, but the population supplied direct according to the
Registrar General's estimate at 30th June, 1969, was 238,530.
No houses were permanently supplied by standpipe.
No artificial fluoride was added, and where the fluoride content is indicated
in the analyses it represents the naturally occurring fluoride in the
water.
The supply was derived from the following works and pumping stations:-
River Thames - derived, repumped at Cricklewood and Battersea
New River - derived from Stoke Newington works
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 source after treatment are shown on page
67.
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. Surveys carried
out between 1966 and 1968 on analyses of water from consumers' premises confirmed
this statement.