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
Orpington 1956
[Report of the Medical Officer of Health for Orpington]
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Parts per million (unless otherwise stated)
BACTERIOLOGICAL RESULTS
| No. of Samples | Before Chlorination | After Chlorination (Water Passing into Supply) | ||||||
|---|---|---|---|---|---|---|---|---|
| Plate Count (Average per ml.) Colonies counted on agar 37°C. 20-24 hrs. | Bact. coli Test | No. of Samples | Plate Count (Average per ml.) Colonies counted on agar 37°C. 20-24 hrs. | Bact. coli Test | ||||
| Percentage samples negative 100 ml. | Average number per 100 ml. | Percentage samples negative 100 ml. | Average number per 100 ml. | |||||
| Orpington Wells | 251 | 0.3 | 99-6 | 0.02 | 256 | — | 100.0 | — |
| N. Orpington Wells.. | 146 | 4.7 | 13-7 | 17.86 | 149 | — | 100.0 | — |
| Jewels Wood Well .. | 160 | 0.04 | 99-4 | 0.01 | 163 | — | 100.0 | — |
| Sundridge Well | 282 | 0.5 | 1000 | — | 250 | — | 100.0 | — |
| Westerham Well | 226 | 0.7 | 1000 | — | 230 | — | 100.0 | — |
| Lullingstone Well .. | 196 | 0.1 | 1000 | — | 202 | — | 100.0 | — |
| Eynsford Wells | 278 | 0.1 | 1000 | — | 283 | — | 100.0 | — |
| Shortlands Wells .. | 499 | 0.01 | 1000 | — | 255 | — | 100.0 | — |
| Horton Kirby Well.. | 239 | 0.7 | 98-3 | 0.03 | 243 | — | 100.0 | — |
| Thames derived | 7066 | — | 61-2 | 4.43 | 3736 | 5.0 | 99.9 | 0.002 |