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98
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 74 of raw waters and 125 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 beer submitted to the
area Public Health Laboratory, 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 260
Chemical 13