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SECTION D:
Sanitary Circumstances of t.lie Area
Water Supply
The Borough has a dual source of supply. ''Tie northern part is supplied by the
Colne Valley Water Company and the central and southern portion by the Metropolitan
Water Board.
Hie 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 working day.
The supply to all areas was satisfactory in quality and quantity.
Number of dwellinghouses supplied from public water mains:-
(a) Direct to houses 44,490
(b) by means of standpipes Nil
Number of population supplied from public water mains:-
(a) Direct to houses 151,850
(b) by means of standpipes Nil
Natural fluoride content of water supplies:-
Colne Valley Water Company: Fluoride content - Nil
Metropolitan Water Board: Fluoride content - 0.15 parts per million.
The water supplied to Hendon is deficient in fluroide and dental decay is more
prevalent here than in those areas where the element is present in optimum quantity.
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