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SECTION D:
SANITARY CIRCUMSTANCES OP 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 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 45,381
(b) by means of standpipes Nil
Number of population supplied from public water mains:-
(a) Direct to houses 150,200
(b) by means of standpipes Nil
Natural fluoride content of water supplies:-
Colne Valley Water Company: Fluoride content-less than
0.1 parts per million
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.
12.