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 1961
[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 1961
Milligrammes per litre (unless otherwise stated)
| Description of Samples | Thames-derived Southern Group | Shortlands | West Wickham | Orpington |
|---|---|---|---|---|
| Number of Samples | 156 | 8 | 4 | 4 |
| Ammonia Nitrogen | 0. 041 | 0.019 | 0.015 | 0.018 |
| Albuminoid Nitrogen | 0. 076 | 0 .041 | 0 .036 | 0 .040 |
| Oxidised Nitrogen—Nitrite | — | — | — | — |
| Oxidised Nitrogen—Nitrate | 4.1 | 4.6 | 5.2 | 6.8 |
| Chlorides as CI. | 27 | 18 | 13 | 18 |
| Oxygen abs. from Permanganate (4 hrs. at 27°C.) | 1.06 | 0.04 | 0.10 | 0.18 |
| Turbidity Units | 0.2 | Nil | Nil | Nil |
| Colour mm. brown 2 ft. Tube (Burgess's Tintometer).. | 13 | Nil | Nil | Nil |
| Hardness (Total) | 262 | 284 | 272 | 300 |
| Hardness (non-carbonate) | 52 | 52 | 28 | 60 |
| pH Value | 7.9 | 7.2 | 7.2 | 7.2 |
| Phosphate as P04 | 1.0 | — | — | — |
| Silicate as SiO2 | 9 | — | — | — |
| Surface active material as Manoxol | 0.11 | — | — | — |
| Sulphate as SO2 | 50 | — | — | — |
| Natural Fluoride as F. | 0.20 | — | — | — |
| Magnesium as Mg. | 6 | — | — | — |
| Free CO2 | — | 30 | 32 | 38 |
| Electrical Conductivity micromhos | 525 | 525 | 475 | 550 |