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86
WATER
I am indebted to the Water Engineer, W.C. Knill, Esq.,
B. Sc., M. I.C. E., M. I. Mech. E., M. I.W.E., for the following data:-
The Water Supply is drawn from deep wells in the Chalk.
These wells are situated at Surrey Street, Stroud Green, Waddon,
Selhurst and Addington. The water from all of the wells is
treated by the addition of chlorine and in the case of the water
from Surrey Street and Waddon, ammonia is added after chlorination.
Owing to the occasional occurrence of turbidity in the
raw water from the Addington Well, this water is filtered before
chlorination. A portion of the northern side of the Borough is
supplied with water which is purchased in bulk from the
Metropolitan Water Board.

The water supply has been satisfactory in quality and
quantity. The supply is piped throughout the area.
(a) Bacteriological Examinations
Regular bacteriological examinations were made of the raw
water and the water going into supply after treatment.
496 raw water samples and 1146 treated water samples were
thus examined during the year by the Chemist and Bacteriologist
on the staff of the Water Undertaking. In addition 12 samples
of raw water and 32 samples of treated water were subjected to
bacteriological examination by the Consultant Bacteriologist to
the Water Undertaking. Further samples were submitted by the
Medical Officer of Health for examination by the Public Health
Laboratory Service.
The results of the bacteriological examination of the raw
waters were typical of waters pumped from the Chalk, some of
them showing the normal deterioration in quality which occurs
after heavy rain. In all cases the examinations showed that the
raw water was suitable for treatment.
The bacteriological examinations of the treated waters