Hints from the Health Department. Leaflet from the archive of the Society of Medical Officers of Health. Credit: Wellcome Collection, London
[Report of the Medical Officer of Health for Orpington]
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Result of the Bacteriological Examination of the Water Supplied to Orpington during the Year 1957.
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 | Coliform Test Percentage samples negative in 100 ml. | No. of Samples | Plate Count (Average per ml.) Colonies counted on agar | Coliform Test Percentage samples negative in 100 ml. | ||||||
Coliform | E. Coli | Coliform | E. Coli | |||||||
37°C. (20-24 hrs.) | 22°C. (3 days) | 37°C. (20-24 hrs.) | 22°C. (3 days) | |||||||
Orpington Wells | 251 | 0.04 | 102.0 | 94.82 | 99.0 | 256 | 0.03 | 16.0 | 100.0 | 1000 |
N. Orpington Wells | 215 | 1.2 | 53.4 | 3.26 | 26.51 | 221 | 0.7 | 21.2 | 99.10 | 1000 |
Jewels Wood Well | 98 | 0.04 | 3.3 | 97.96 | 100.0 | 101 | 0.1 | 72.2 | 100.0 | 1000 |
Sundridge Well | 265 | 110.2 | 101.5 | 98.49 | 100.0 | 256 | 0.1 | 30.5 | 100.0 | 1000 |
Westerham Well | 249 | 0.1 | 3.0 | 9960 | 100.0 | 255 | 0.1 | 12.5 | 96.47 | 1000 |
Lullingstone Well | 237 | 0.04 | 14.0 | 98.73 | 99.58 | 242 | 0.02 | 7.7 | 97.93 | 100.0 |
Eynsford Bore | 121 | 0.02 | 81.0 | 99.17 | 99.17 | 124 | 0.04 | 1.2 | 100.0 | 1000 |
Eynsford Wells | 231 | 0.03 | 15.0 | 97.40 | 99.57 | 234 | 0.02 | 11.3 | 97.44 | 100.0 |
Shortlands No. 1 | 161 | 0.04 | 4.9 | 100.0 | 100.0 | 256 | 0.2 | 3.6 | 100.0 | 100.0 |
Shortlands No. 2 | 92 | 0.1 | 2.2 | 100.0 | 100.0 | 256 | 0.2 | 3.6 | 100.0 | 100.0 |
Horton Kirby Well | 241 | 0.1 | 27.7 | 96.27 | 98.76 | 246 | 0.2 | 27.0 | 99.59 | 100.0 |
Thames derived | – | – | – | – | – | 3,438 | 6.4 | – | 99.33 | 99.91 |