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 1949
[Report of the Medical Officer of Health for Orpington]
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APPENDIX 6.
AVERAGE RESULTS OF THE CHEMICAL AND BACTERIOLOGICAL EXAMINATION OF THE WATER SUPPLY TO ORPINGTON URBAN DISTRICT 1949.
PARTS PER MILLION (unless otherwise stated).
| Description of the Sample | No. of Samples | Ammoniacal Nitrogen | Albuminoid Nitrogen | Oxidised Nitrogen | Chlorides as Cl | Oxygen abs. from Permanganate 3 hrs. at 80°F. | Turbidity in terms of Silica | Colour m m. brown, 2 ft. tube Burgess's Tintometer | Hardness (Total) | Hardness (Perm) | pH Value | Conductivity | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Nitrite | Nitrate | ||||||||||||
| Orpington Well | 4 | 0.000 | 0.025 | — | 7.5 | 16.1 | 0.05 | — | 0 | 283 | 83 | 7.1 | 450 |
| North Orpington | 3 | 0.007 | 0.022 | — | 4.5 | 15.7 | 0.17 | — | 0 | 281 | 62 | 7.1 | 400 |
| Jewels Wood | 2 | 0.008 | 0.014 | — | 2.8 | 11.5 | 0.03 | — | 0 | 257 | 49 | 7.2 | 375 |
| Sundridge | 5 | 0.039 | 0.017 | — | 2.2 | 16.8 | 0.15 | — | 0 | 226 | 79 | 7.3 | 350 |
| Eynesford | 3 | 0.005 | 0.025 | — | 3.7 | 15.3 | 0.06 | — | 0 | 271 | 76 | 7.2 | 425 |
| Shortlands | 5 | 0.001 | 0.038 | — | 4.7 | 22.3 | 0.40 | — | 5 | 261 | 95 | 7.3 | 450 |
| Bexley | 2 | 0.000 | 0.023 | — | 4.8 | 16.3 | 0.04 | — | 3 | 285 | 91 | 7.1 | 450 |
BACTERIOLOGICAL RESULTS.
| No. of samples | Percentage of samples negative to Bact. coli in 100 ml. | Bact. coli Test Bact. coli per 100 ml. | |
|---|---|---|---|
| Orpington | 254 | 100.0 | Nil |
| North Orpington | 237 | 100.0 | Nil |
| Jewels Wood | 115 | 100.0 | Nil |
| Sundridge | 254 | 100.0 | Nil |
| Eynesford | 367 | 100.0 | Nil |
| Shortlands | 255 | 99.2 | 0.016 |
| Bexley | 234 | 100.0 | Nil |