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SECTION D:
Sanitary Circumstances of the Area
WATER SUPPLY
The Borough has a dual source of supply. The northern part is supplied by
the Colne Valley Water Company and the central and southern portion by the Metropolitan
Water Board.
The Colne Valley water is derived from deep wells sunk into the chalk and
before distribution to the consumers the water is under constant supervision of
a chemical and bacteriological staff which carries out examinations in modern
laboratories situated at the works.
The water supplied by the Metropolitan Water Board is selected Thames water
which has been subjected to purification by storage in which time it is freed of
the bulk of organisms. It is filtered through rapid and then slow filters, attaining
a degree of purity which compares favourably with the general supplies in
Great Britain, but as a further safeguard terminal chlorination is applied which
ensures a first class water in every respect. Samples of water are examined
bacteriologically, chemically and for taste and other special purposes on every
day.
The supply to all areas was satisfactory in quality and quantity.
Number of dwelling houses supplied from public water mains:-
(a) Direct to houses 44,942
(b) by means of standpipes Nil
Number of population supplied from public water mains:-
(a) Direct to houses 150,720
(b) by means of standpipes Nil
Natural flouride content of water supplies:-
Colne Valley Water Company: Fluoride content - Nil
Metropolitan Water Board : Fluoride content - 0.25 parts per million.
The water supplied to Hendon is deficient in fluoride and dental decay is
more prevalent here than in those areas where the element is present in optimum
quantity.
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