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 1951
[Report of the Medical Officer of Health for Orpington]
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TABLE VIII.
AVERAGE RESULTS OF THE CHEMICAL AND BACTERIOLOGICAL EXAMINATION OF THE WATER SUPPLY TO ORPINGTON FOR THE YEAR 1951.
PARTS PER MILLION (unless otherwise stated).
| Description of the Sample | No. of Samples | Ammo-niacal Nitrogen | Albuminold Nitrogen | Oxidised Nitrite | Nitrogen Nitrate | Chlorides as C1 | Oxygen abs. from Permanganate 3 hrs. at 80°F. | Colour m.m. brown, 2 ft. tube Burgess's Tintometer | Hardness (Total) | Hardness non-carbonate | pH Value | Silica as Sio$ | Conductivity |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Orpington Well | 2 | 0.000 | 0.016 | — | 8.5 | 16.0 | 0.090 | 0 | 292 | 52 | 7.3 | 13 | 475 |
| North Orpington | 2 | 0.004 | 0.020 | _ | 5.3 | 13.8 | 0.100 | 0 | 269 | 34 | 7.4 | 15 | 425 |
| Jewels Wood | 2 | 0.004 | 0.016 | — | 3.0 | 10.0 | 0.190 | 0 | 249 | 27 | 7.4 | 12 | 375 |
| Sundridge | 4 | 0.015 | 0.027 | — | 2.8 | 17.4 | 0.070 | 0 | 219 | 40 | 7.5 | 17 | 350 |
| Eynsford | 4 | 0.014 | 0.032 | — | 4.2 | 14.3 | 0.062 | 2 | 264 | 35 | 7.3 | 15 | 425 |
| Shortlands | 6 | 0.005 | 0.022 | — | 5.1 | 16.3 | 0.050 | 0 | 295 | 77 | 7.3 | 17 | 450 |
| Bexley | 6 | 0.009 | 0.053 | — | 5.8 | 17.3 | 0.160 | 0 | 295 | 61 | 7.3 | 17 | 450 |
BACTERIOLOGICAL RESULTS.
| No. of samples | Plate Count (Average per millilitre) Colonies counted on Agar | Bact. coli Test | |||
|---|---|---|---|---|---|
| 22 C. (3 days) | 37 C. (20-24 hrs.) | Percentage of samples negative in 100 ml. | Average number of Bact. coli per 100 ml. | ||
| Orpington | 249 | 108.7 | 9.7 | 99.6 | 0.008 |
| North Orpington | 250 | 104.8 | 5.7 | 100-0 | Nil |
| Jewels Wood | 47 | 2.3 | 0.6 | 100.0 | Nil |
| Sundridge | 255 | 0.9 | 0.5 | 99.6 | 0.008 |
| Eynsford | 352 | 181.6 | 42.0 | 99.2 | 0.017 |
| Shortlands | 256 | 7.8 | 0.1 | 100.0 | Nil |
| Bexley | 247 | 2.0 | 0.5 | 99.6 | 0.004 |