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 1968
[Report of the Medical Officer of Health for Waltham Forest]
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BACTERIOLOGICAL RESULTS - YEARLY AVERAGES, 1968
| Source of supply | BEFORE TREATMENT | AFTER TREATMENT | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Agar plate count per ml. | Coliform count | Escherichia coli count | Agar plate count per ml. | Coliform count | E. coli count | |||||||
| Number of samples | 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. | Number of samples | 20-24 hours at 37° C. | 3 days at 22c C. | Per cent. samples negative in 100 ml. | Per cent. samples negative in 100 ml. | |
| Lee Bridge (Lee-derived) | 507 | 21.2 | 99.41 | 99.80 | ||||||||
| Ferry Lane | 15 | 5.9 | 100.0 | 100.0 | ||||||||
| Chingford Mill | 241 | 0.1 | 7 | 99.59 | - | 99.59 | - | 246 | 0.1 | 8 | 100.0 | 100.0 |
| Thames-derived, North of River | 1,720 | 12.1 | 99.94 | 99.94 | ||||||||
| Coppermill | 156 | 30.7 | 1 00.0 | 100.0 | ||||||||