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 1952
[Report of the Medical Officer of Health for Chislehurst]
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Average Results of the Chemical and Bacteriological Examination of the Water Supply to Chislehurst and Sidcup during 1952.
Parts per Million (unless otherwise stated)
| Orpington Well | North Orpington Well | Shortlands Well | Eynsford Well | Bexley Well | Wilmington Well | Darenth Well | Thames derived filtered water | |
|---|---|---|---|---|---|---|---|---|
| Number of samples | 4 | 4 | 8 | 2 | 1,714 | |||
| Ammoniacal Nitrogen | 0.004 | 0.010 | 0.007 | 0.004 | 0.011 | 0.013 | 0.013 | 0.027 |
| Albuminoid Nitrogen | 0.03.5 | 0.035 | 0.025 | 0.033 | 0.037 | 0.026 | 0.025 | 0.093 |
| Oxidised Nitrogen—Nitrite | — | — | — | — | — | — | — | — |
| Oxidised Nitrogen—Nitrate | 6.9 | 4.9 | 4.3 | 6.2 | 7.3 | 5.3 | 3.7 | |
| Chlorides as CI. | 15.4 | 13.9 | 18.6 | 14.9 | 16.1 | 19.5 | 14.8 | 24.6 |
| Oxygen abs. from Permanganate 3 hrs. at 27° C. | 0.05 | 0.05 | 0.19 | 0.09 | 0.07 | 0.12 | 0.08 | 1.05 |
| Turbidity in terms of Silica | — | — | — | — | — | — | — | 0.2 |
| Colour, M.M. brown 2 ft. tube, Burgess's Tintometer | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 12 |
| Hardness (Total) | 284 | 267 | 282 | 266 | 282 | 291 | 254 | 256 |
| Hardness Non-carbonate | 43 | 36 | 61 | 41 | 50 | 54 | 29 | 62 |
| pH Value | 7.3 | 7.3 | 7.4 | 7.3 | 7.3 | 7.2 | 7.3 | 7.8 |
| Magnesium | 2.6 | 2.5 | 5.8 | 3.2 | 3.6 | 3.7 | 4.0 | 5.5 |
| Silica as Si02 | 12 | 14 | 16 | 14 | 17 | 19 | 14 | 10 |
| Fluorides F | 0.03 | 0.04 | 0.05 | 0.04 | 0.05 | 0.06 | 0.03 | — |
| Oxygen Saturation % | — | — | — | — | — | — | — | — |
| B.O.D. 5 days at 65°F | — | — | — | — | — | — | — | — |
| Conductivity | 450 | 425 | 450 | 450 | 475 | 475 | 425 | 475 |