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109
after heavy rain. In all cases the examinations showed that the
raw water was suitable for treatment.
The bacteriological examinations of the treated waters showed
that these waters were of uniformly excellent quality.
(b) Chemical Analyses.
The arrangements for chemical analyses are similar to those
for bacteriological examinations. The total numbers of samples
analysed in the Water Department's laboratory and by the
consultant were 63 of raw waters and 109 of treated waters going
into supply.
The results of the chemical analyses were uniformly satisfactory.
The waters are not liable to have plumbo-solvent action.
The whole of the population and dwelling-houses within the
area of supply are supplied from public water mains direct to the
houses.
Testing of Samples by the Health Department.
At least five samples each week have been submitted to the
area Public Health Laboratory at Park Hospital, Lewisham, for
bacteriological examination. The premises from which the
samples are taken are selected to cover each week the different
sources of supply of the several areas of the borough. In addition,
a monthly chemical analysis is carried out by the Public
Analyst, who is furnished with copies of the reports of the
bacteriologist.
During the year under review the total number of examinations
thus performed were :
Bacteriological
Chemical
274
12