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
Beckenham 1962
[Report of the Medical Officer of Health for Beckenham]
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AVERAGE RESULTS OF THE CHEMICAL EXAMINATION OF WATER SUPPLIED TO THE BOROUGH OF BECKENHAM DURING 1962
Milligrammes per litre (unless otherwise stated)
| Description of Samples | Thames-derived Southern Group | Shortlands | West Wickham | Orpington |
|---|---|---|---|---|
| Number of Samples | 156 | 10 | 3 | 4 |
| Ammonia Nitrogen | 0 .042 | 0.013 | 0.016 | 0.014 |
| Albuminoid Nitrogen | 0 .076 | 0 .024 | 0.013 | 0.020 |
| Oxidised Nitrogen—Nitrite | — | — | — | — |
| Oxidised Nitrogen—Nitrate | 4.0 | 4.4 | 5.2 | 6.4 |
| Chlorides as Cl | 31 | 18 | 13 | 15 |
| Oxygen abs. from Permanganate (4 hrs. at 27°C.) | 1.12 | 0.08 | 0.06 | 0.08 |
| Turbidity Units | 0.2 | — | — | 0.1 |
| Colour mm. brown 2 ft. Tube (Burgess's Tintometer) | 12 | — | — | — |
| Hardness (Total) | 265 | 282 | 266 | 286 |
| Hardness (non-carbonate) | 58 | 54 | 20 | 34 |
| pH Value | 7.8 | 7.2 | 7.3 | 7.2 |
| Phosphate as P04 | 1.3 | — | — | — |
| Silicate as SiO2 | 10 | — | — | — |
| Surface active material as Manoxol | 0.12 | — | _ | — |
| Sulphate as S04 | 61 | — | — | — |
| Natural Fluoride as F | 0.25 | — | — | — |
| Magnesium as Mg. | 6 | — | — | — |
| Free CO2 | — | — | — | — |
| Electrical Conductivity micromhos | 550 | 530 | 480 | 520 |