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98
The results of the bacteriological examination of the raw
waters were typical of waters derived from the Chalk, some of
which showed the normal deterioration in quality which occurs
after heavy rainfall. In all cases the results indicated that
the waters were suitable for treatment. Bacteriological examinations
of the treated waters indicated that these were of
uniformly satisfactory quality.
(b) Chemical Analysis.
The arrangements for chemical analyses are similar to those
for bacteriological examinations. The total numbers of samples
analysed in the laboratory of the Water Undertaking and by the
Consultants were 90 samples of raw waters and 121 of treated
waters going into supply. The results of these analyses were
uniformly satisfactory.
(c) Testing of Samples of Drinking Water by the Health Department
Samples are submitted weekly to the area Public Health
Laboratory, for bacteriological examination. The premises from
which samples are taken are selected to cover each week the
different sources of supply to the several areas of the Borough.
In addition, a sample is submitted each month for chemical
analysis which 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
performed were:-
Bacteriological 268
Chemical 12
(d) Unsatisfactory Samples
The Health Department is warned by telephone whenever preliminary
results of bacteriological tests show presumptive coli.
The Water Engineer is immediately notified. If there is no
apparent cause, simultaneous re-sampling by the Water and Health
Departments is performed. Further action depends on the findings
of these re-tests.