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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Average Results of the Chemical and Bacteriological Examination of the water supplied to the Chislehurst and Sidcup Urban District Council during 1955.
Parts per Million (unless otherwise stated).
| Horton Kirby Well | Orpington Well | North Orpington Well | Short-lands Well | Eyns-ford Well | Wilmington Well | Darenth Well | Thames derived filtered water | |
|---|---|---|---|---|---|---|---|---|
| Number of samples | 2 | 4 | 4 | 10 | 5 | 7 | 8 | 1663 |
| Ammoniacal Nitrogen | Nil | Nil | 0.003 | 0.002 | 0.001 | 0.006 | Nil | 0.014 |
| Albuminoid Nitrogen | 0.015 | 0.019 | 0.019 | 0.020 | 0.019 | 0.024 | 0.018 | 0.085 |
| Oxidised Nitrogen—Nitrite | — | — | — | — | — | — | — | — |
| Oxidised Nitrogen—Nitrate | 5.0 | 7.5 | 5.4 | 4.5 | 4.1 | 7.1 | 5.5 | 3.8 |
| Chlorides as Cl | 16.0 | 15.0 | 13.0 | 17.0 | 16.0 | 21.0 | 16.0 | 26.0 |
| Oxygen abs. from Permanganate 4 hrs. at 27°C. | 0.08 | 0.08 | 0.07 | 0.08 | 0.10 | 0.12 | 0.06 | 1.04 |
| Turbidity in terms of Silica | 0.4 | 0.3 | Nil | Nil | 0.1 | 0.1 | Nil | 0.2 |
| Colour, m.m. brown 2 ft. tube, Burgess's Tintometer | Nil | 3 | Nil | Nil | Nil | Nil | Nil | 12 |
| Hardness (Total) | 254 | 282 | 265 | 272 | 254 | 286 | 270 | 258 |
| Hardness Non-Carbonate | 39 | 50 | 35 | 70 | 34 | 56 | 40 | 65 |
| pH Value | 7.3 | 7.2 | 7.2 | 7.1 | 7.3 | 7.2 | 7.2 | 7.8 |
| Phosphate as P.O4 | 0.10 | 0.06 | 0.06 | 0.05 | 0.06 | 0.04 | 0.05 | 0.50 |
| Sulphates as S04 | 18 | 13 | 8 | 41 | 11 | 15 | 13 | 49 |
| Dissolved Oxygen | — | — | — | — | — | — | — | — |
| Oxygen Saturation % | — | — | — | — | — | — | — | — |
| B.O.D. 5 days at 65°F. | — | — | — | — | — | — | — | — |
| Conductivity | 425 | 425 | 425 | 450 | 400 | 450 | 450 | 450 |