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 1973
[Report of the Medical Officer of Health for Waltham Forest]
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OF WATER SUPPLIED TO THE LONDON BOROUGH OF WALTHAM FOREST
| BEFORE TREATMENT | AFTER TREATMENT | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Agar plate count per ml. | Coliform count | Eschericia coli count | Agar plate count per ml. | Col iform count | E. coli count | |||||||
| Source of supply | Number of samples | 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. | Number of samples | 20-24 hours at 37° C. | 3 days at 22° C. | Percent. samples negative in 100 ml. | Percent. samples negative in 100 ml. |
| Chingford Mill | 246 | 0.2 | 3 | 1 00.0 | - | 100.0 | - | 238 | 0.2 | 3 | 100.0 | 100.0 |
| Thames-derived | 8.064 | 43.4 | - | 30.78 | 15.7 | 53.58 | 4.1 | 3,858 | 9.9 | - | 99.92 | 100.0 |
| Coppermills | 1 ,356 | 1 10.1 | - | 27.58 | 17.0 | 53.24 | 3.4 | 255 | 10.0 | - | 100.0 | 100.0 |
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