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 1958
[Report of the Medical Officer of Health for Orpington]
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Parts per million (unless otherwise stated)
BACTERIOLOGICAL RESULTS
| Before Chlorination | After Chlorination (Water Passing into Supply) | |||||||
|---|---|---|---|---|---|---|---|---|
| Plate Count (Average per ml.) Colonies counted on agar | Conform Test Percentage samples negative in 100 ml. Coliform E. Coli | Plate Count (Average per ml.) Colonies counted on agar | Coliform Test Percentage samples negative in 100 ml. Coliform E. Coli | |||||
| 37 °C (20-24 hrs.) | 22°C. (3 days) | 37°C. (20-24 hrs.) | 22°C. (3 days) | |||||
| Orpington Well | 0.1 | 16.0 | 94.78 | 99.60 | 0.1 | 20.4 | 100.0 | 100.0 |
| N. Orpington Well | 2.9 | 32.2 | 1.32 | 14.54 | 1.8 | 23.3 | 99.57 | 100.0 |
| Shortlands No. 1 | 0.1 | 1.9 | 97.39 | 99.13 | 0.1 | 5.5 | 100.0 | 100.0 |
| Shortlands No. 2 | 0.1 | 13.0 | 96.60 | 97.96 | ||||
| Shortlands No. 3 | 0.1 | 4.0 | 97.91 | 99.16 | ||||
| Jewels Wood Well | 0.2 | 4.3 | 94.34 | 94.97 | 0.1 | 8.7 | 99.39 | 100.0 |
| Sundridge No. 4 | 0.8 | 24.7 | 98.56 | 99.28 | 0.04 | 3.0 | 98.81 | 100.0 |
| Westerham Well | 0.3 | 15.0 | 99.20 | 100.0 | 0.1 | 5.5 | 94.14 | 100.0 |
| Lullingstone Well | 0.1 | 4.3 | 100.0 | 100.0 | 0.1 | 6.6 | 97.09 | 100.0 |
| Eynsford Well | 0.4 | 65.5 | 75.00 | 96.25 | 01. | 40.0 | 98.86 | 100.0 |
| Eynsford Bore | 0.1 | 45.7 | 93.48 | 99.28 | 0.03 | 11.4 | 100.0 | 100.0 |
| Horton Kirby Well | 0.4 | 8.3 | 93.03 | 96.31 | 0.3 | 16.7 | 99.60 | 100.0 |
| Thames derived | — | — | — | — | 9.7 | — | 99.07 | 99.88 |