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SANITARY CIRCUMSTANCES
WATER SUPPLY
I am indebted to Dr. E. Windle Taylor, Director of Water Examination
of the Metropolitan Water Board, for the following information.
The supply for Hornsey area has been satisfactory both in quantity and
quality during the year. The supply came from two main sources:-
(a) River Thames derived water stored in Queen Mary reservoir and
treated at the Board's filtration works at Ashford Common via
Fortis Green.
(b) Water from the New River derived from the River Lea and from wells
and treated at the Board's filtration works at Stoke Newington and
at Hornsey.
Samples are collected on five days of every week, or more often if required,
at each stage of the purification process as well as samples from the
distribution system, and tests include physical, chemical and microbiological
examinations.
All new and repaired mains are chlorinated before being restored to use
and samples of water from them are tested to ensure that its quality is up to
that normally supplied.
The water supply is in all cases direct to dwelling houses; none is
supplied by means of a stand-pipe. The water supplied to this area is not
plumbo-solvent.
Bacteriological Results of Water Passing into
Supply after Chlorination
Plate counts Coliform test
(Average per ml.) Percentage samples
Colonies counted on negative in 100 ml.
agar 37°C.
(20-24 hrs.) Coliform E. coli
River Thames 772 16.3 99.88 100.0
New River 514 4.8 99.61 100.0
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