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 Chislehurst]
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Description of the Sample | Bexley Well | Orpington Well | North Orping-Well | Short-lands No. 1 | Short-lands No. 2 | Eyns-ford Well | Eyns-ford Bore | Horton Kirby | Wilmington No. 1 | Wilmington No. 2 | Darenth Well | Darenth Bore Hole | Thames derived |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
No. of Samples Plate Counts (Average per ml.] | 321 | 251 | 215 | 161 | 92 | 231 | 121 | 241 | 236 | 225 | 239 | 209 | — |
Colonies counted on Agar: 37° C. (20-24 hours) | 0.2 | 0.04 | 1.2 | 0.04 | 0.1 | 0.03 | 0.02 | 0.1 | 0.8 | 0.1 | 0.2 | 1.6 | - |
22° C. (3 days) | 4.3 | 102.0 | 53.4 | 4.9 | 2.2 | 15.0 | 81.0 | 27.7 | 57.4 | 14.5 | 7.5 | 14.8 | — |
Coliform test. Percentage samples negative in 100 ml.: Coliform | 99.10 | 94.82 | 3.26 | 100.0 | 100.0 | 97.40 | 99.17 | 96.27 | 88.98 | 88.80 | 94.98 | 95.69 | - |
E. Coliform | 100.0 | 99.60 | 26.51 | 100.0 | 100.0 | 99.57 | 99.17 | 98.76 | 99.58 | 99.56 | 100.0 | 99.04 | — |
Number of Samples | 252 | 256 | 221 | 256 | 256 | 234 | 124 | 246 | 255 | 255 | 255 | 255 | 3438 |
Plate Counts (Average per ml.) Colonies counted on Agar: 37°C. (20-24 hrs.) | 0.02 | 0.03 | 0.7 | 0.2 | 0.2 | 0.02 | 0.04 | 0.2 | 0.1 | 0.1 | 0.4 | 0.4 | 6.4 |
22°C. (3 days) | 4.3 | 16.0 | 21.2 | 3.6 | 3.6 | 11.3 | 1.2 | 27.0 | 2.8 | 2.8 | 5.4 | 5.4 | — |
Coliform test Percentage samples negative in 100 ml.: Coliform | 100.0 | 100.0 | 99.10 | 100.0 | 100.0 | 97.44 | 100.0 | 99.59 | 98.82 | 98.82 | 100.0 | 100.0 | 99.33 |
E. Coliform | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 100.0 | 99.91 |