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 1955
[Report of the Medical Officer of Health for Chislehurst]
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BACTERIOLOGICAL RESULTS
| Horton Kirby Well | Orpington Well | N. Orpington Well | Shortlands Well | Eynsford Well | Wilmington Well | Darenth Well | Thames derived filtered water | |
|---|---|---|---|---|---|---|---|---|
| 140 | 249 | 226 | 499 | 311 | 470 | 398 | 7040 | |
| Plate Count (Average per millilitre) Colonies counted on Agar: 37°C. (20-24 hours) Bact. coli test: | 0.2 | 5.0 | 5.3 | 0.04 | 0.5 | 3.0 | 0.2 | — |
| Percentage samples negative in 100 ml. | 98.6 | 100.0 | 25.2 | 100.0 | 99.1 | 99.4 | 99.3 | 60.4 |
| Average number per 100 ml | 0.01 | — | 6.80 | — | 0.01 | 0.01 | 0.01 | 3.73 |
| 143 | 255 | 230 | 256 | 316 | 255 | 251 | 3561 | |
| 37°C. (20-24 hours) Bact. coli test: | — | — | — | — | — | — | — | 7.8 |
| Percentage samples negative in 100 ml. | 100.0 | 100.0 | 99.6 | 100.0 | 100.0 | 100.0 | 100.0 | 99.9 |
| Average number per 100 ml | — | — | 0.004 | — | — | — | — | 0.002 |