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
Chislehurst 1956
[Report of the Medical Officer of Health for Chislehurst]
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Parts per million (unless otherwise stated). BACTERIOLOGICAL RESULTS
| Bexley Well | Horton Kirby Well | Orpington Well | N. Orpington Well | Shortlands Wells | Eynsford Wells | Wilmington Wells | Darenth Wells | Thames derived filtered water | |
|---|---|---|---|---|---|---|---|---|---|
| Number of samples | 467 | 289 | 251 | 146 | 499 | 278 | 366 | 421 | 7066 |
| Plate Count (Average per millilitre) Colonies counted on Agar: 37°C. (20-24 hours) | 0.2 | 0.7 | 0.3 | 4.7 | 0.01 | 0.1 | 0.3 | 0.02 | |
| Bact. coli test: | |||||||||
| Percentage samples negative in 100 ml. | 1000 | 98.3 | 99.6 | 13.7 | 100.0 | 100.0 | 96.5 | 99.5 | 61.2 |
| Average number per 100 ml | — | 0.03 | 0.02 | 17.86 | — | — | 0.09 | 0.01 | 4.43 |
| Number of samples | 257 | 243 | 256 | 149 | 255 | 283 | 244 | 255 | 3736 |
| Plate Count (Average per millilitre) Colonies counted on Agar: 37°C. (20-24 hours) | — | — | — | — | — | — | — | — | 5.0 |
| Bact. coli test: Percentage samples negative in 100 ml. | 1000 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 99.9 |
| Average number per 100 ml | — | — | — | — | — | — | — | — | 0.002 |