London's Pulse: Medical Officer of Health reports 1848-1972
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Hints from the Health Department. Leaflet from the archive of the Society of Medical Officers of Health. Credit: Wellcome Collection, London
Kingston upon Thames 1970
[Report of the Medical Officer of Health for Kingston-upon-Thames]
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128
WATER SUPPLY,
The following information has been kindly supplied by the
Director of Water Examinations, Metropolitan Water Board,
Yearly Average Bacteriological Results
Before Treatment.
Number of Samples 8,259
Agar plate count per ml. 20-24 hours at 37°C 31.9
Coliform Count -
Per cent, samples negative in 100 ml 37.91
Count per 100 ml 17.3
Escherichia coli count -
Per cent, samples negative in 100 ml 53.58
Count per 100 ml 4.7
After Treatment.
Number of Samples 3,710
Agar plate count per ml. 20-24 hours at 37°C 8.0
Coliform count - per cent samples negative in 100 ml. 99.92
E. Coli count - per cent. samples negative in 100 ml. 99.97