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 1971
[Report of the Medical Officer of Health for Waltham Forest]
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BACTERIOLOGICAL RESULTS - YEARLY AVERAGES, 1971
| Source of supply | BEFORE TREATMENT | AFTER TREATMENT | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Number of samples | Agar plate count per ml. | Coliform count | Escherichia coli count | Number of samples | Agar plate count per ml. | Coliform count | E. coli count | |||||
| 20-24 hours at 37° C. | 3 days at 22° C. | Percent, samples negative in 100 ml. | Count per 100 ml. | Percent, samples negative in 100 ml. | Count per 100 ml. | 20-24 hours at 37° C. | 3 days at 22° C. | Percent, samples negative in 100 ml. | Percent, samples negative in 100 ml. | |||
| Lee Bridge | 2,698 | 59.7 | 35.29 | 11.3 | 59.30 | 2.1 | 278 | 27.4 | 99.64 | 100.0 | ||
| Chingford Mill | 250 | 0.1 | 12 | 99.20 | - | 100.00 | - | 254 | 0.1 | 8 | 100.0 | 100.0 |
| Thames-derived | 8,154 | 53.9 | 40.37 | 12.2 | 54.91 | 5.1 | 3,901 | 8.4 | 99.51 | 99.97 | ||
| CoppermilIs | 693 | 14.5 | 34.63 | 10.4 | 52.67 | 2.7 | 240 | 9.9 | 100.0 | 100.0 | ||