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
Orpington 1964
[Report of the Medical Officer of Health for Orpington]
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25.
Average Results of the Chemical Examination of the waters supplied to the Orpington Urban District Council
MILLIGRAMMES PER LITRE (unless otherwise stated)
| Description of the Sample | Sundridge Well | Lullingstone Well | Eynsford Well | Horton Kirby Well | Orpington Yell | North Orpingto Well |
|---|---|---|---|---|---|---|
| No. of Samples | 15 | 8 | 8 | 8 | 4 | 8 |
| Ammoniacal Nitrogen | 0.005 | 0.005 | 0.001 | 0.003 | 0.007 | 0.006 |
| Albuninoid Nitrogen | 0.020 | 0.014 | 0.018 | 0.022 | 0.015 | 0.016 |
| Nitrate Nitrogen | 3.2 | 4.0 | 4.2 | 4.8 | 6.9 | 4.8 |
| Chlorides as C1. | 18 | 15 | 16 | 19 | 16 | 14 |
| Oxygen abs from KMn04 4 hrs. at 27°C. | 0.06 | 0.09 | 0.08 | 0.04 | 0.12 | 0.06 |
| Turbidity units | Nil | Nil | Nil | Nil | Nil | Nil |
| Colour (Burgess) scale | Nil | Nil | Nil | Nil | Nil | Nil |
| Hardness (total) | 214 | 254 | 260 | 264 | 284 | 268 |
| Hardness (non- Carbonate) | 42 | 24 | 28 | 40 | 36 | 24 |
| pH Value | 7.4 | 7.3 | 7.3 | 7.3 | 7.1 | 7.2 |
| (Phosphate as P04 | ||||||
| Silicate as Si02 | ||||||
| Sulphate as SO 4 | -........ | |||||
| Magnesium as Hg. | ||||||
| Natural Fluoride as F. | 0.15 | 0.15 | 0.2 | 0.15 | 0.1 | 0.1 |
| Free C02 | ||||||
| Surface-active material as Manaxol OT | . | |||||
| B.O.D, 5 days at 20oC. | ||||||
| Electrical Conductivity (micromhos) | 410 | 450 | 470 | 480 | 510 | 480 |