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74
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 1971.
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 the analytical 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 other abnormality is immediately
investigated.
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 estimate at 30th June, 1971, was
219, 240.
No houses were permanently supplied by standpipe.
No artificial fluoride is being added, and where the fluoride
content is indicated in the analysis it represents the naturally
occurring fluoride in the water.
The supply was derived from the following works and pumping
stations - River Thames - derived water from the Thames Valley Group.
New River - derived water 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
analysis of supply from the above sources after treatment are shown on
the attached sheets.
On account of their hardness content and alkali reaction the Boards
river and well water supplies are shown to be not 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.'