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that such food must remain sealed and not be removed from his premises
until seen by the Public Health Inspector is the only method of ensuring
that imported food is properly controlled.

4. WATER SUPPLIES
It is the duty of the Local Authority to ascertain the sufficiency and
wholesomeness of water supplies in the district. The Metropolitan Water Board
supply the whole of the district and report on their supplies as follows:-
'1. (a) The supply was satisfactory both as to quality and quantity
throughout 1971.
(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 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, 1971 was 54,620.
(ii) No houses were permanently supplied by standpipe.
(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:- Lee Bridge Works and, during the summer,
Coppermills Works. Well water from Chingford Mill and
Waltham Abbey pumping stations.
No new sources of supply were instituted and there were no
changes to the general scheme of supply in your area.
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