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1. (a) The supply was satisfactory both as to (i) quality, and
(ii) quantity throughout 1972.
(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 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 distributing 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, 1972,
was 54,920.
(ii) No houses were permanently supplied by stand-pipe.
(d) No artificial fluoride is being 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
Mainly river-derived water from Coppermilis; with
some well water from Chingford Pumping Station from
time to time, and a little from Waltham Abbey Pumping
Station.
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
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.
/Water
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