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36
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 52 of raw waters and 118 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.
The Corporation resolved that routine testing of consumers'
water samples by the Health Department should concentrate more
on bacteriological than chemical analysis. Accordingly, from
the commencement of the year 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 numbers of examinations
thus performed were:
Bacteriological 322
Chemical 18
As far as the Croydon derived water was concerned the
results were consistently of the highest standard, but during the
latter half of the year some anomalous reports were received
regarding the water supplied by the Metropolitan Water Board.
Although these did not suggest that the M.W.B. water was cither
than pure and wholesome, and entirely fit for public and domestic
usage, the deviations from normal were considered sufficient to