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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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 |