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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.
(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.
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
micro-biological 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 supplied to this area is not plumbo-solvent.
The water supply is in all cases direct to dwelling houses; none is
supplied by means of a stand pipe.
Chemical Examination
217 samples of filtered water derived from the River Thames and 238
from the New River were taken for chemical examination. All were
found to be satisfactory.
The natural fluoride content in water supplied to Hornsey is 0.15
parts per million.
Bacteriological Examination
Samples of water after chlorination, i.e. water passing into supply,
were taken for bacteriological examination, 213 from River Thames
derived water and 256 from New River derived water. The results proved
satisfactory.
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