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

Waltham Forest 1970

[Report of the Medical Officer of Health for Waltham Forest]

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Table: BACTERIOLOGICAL RESULTS - YEARLY AVERAGES, 1970OF WATER SUPPLIED TO THE LONDON BOROUGH OF WALTHAM FOREST

BACTERIOLOGICAL RESULTS - YEARLY AVERAGES, 1970

OF WATER SUPPLIED TO THE LONDON BOROUGH OF WALTHAM FOREST

Source of supplyBEFORE TREATMENTAFTER TREATMENT
Number of samplesAgar plate count per ml.Collform countEscherichia coll countNumber of samplesAgar plate count countCollform countE. coll count
20-24 hours at 37° C.3 days at 22°C.Per cent, samples negative In 100 ml.Count per 100 ml.Per Cent, samples negative in 100 ml.Count per 100 ml.20-24 hours at 37° C.3 days at 22° C.Per cent, samples negative In 100 ml.Per cent, samples negative In 100 ml.
Lea Bridge2,70976.7-32.851 1.854.602.942928.9-99.5399.77
Chingford Mill2470.1999.60-99.60-2510.14100.0100.0
Th ames-derived8,25931.9•37.9117.353.584.73,7108.0-99.9299.97
Coppermills72350.0-23.5212.540.945.225712.5-98.44100.0