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
Waltham Forest 1971
[Report of the Medical Officer of Health for Waltham Forest]
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METROPOLITAN WATER BOARD - WATER EXAMINATION DEPARTMENT
AVERAGE RESULTS OF THE CHEMICAL EXAMINATION OF WATER SUPPLIED TO THE LONDON BOROUGH OF WALTHAM FOREST DURING 1971
Milligrammes per litre (unless otherwise stated)
| Description of the Sample | Number of Samples Day of the month | Ammoniacal Nitrogen | Albuminoid Nitrogen | Nitrate Nitrogen | Oxygen abs, from KMn04 4 hrs. at 27°.-C. | B.O.D. 5 days at 20°. C. | Hardness (total) CaC03 | Hardness (non-carbonate) CaC03 | Magnesium as Mg | Sodium as Na | Potassium as K | Chloride as CL | Phosphate as P04 | Silicate as Si02 | Sulphate as S04 | Natural Fluoride as F | Surface-active material as Manoxol OT | Turbidity units | Colour (Burgess units) | PH value | Electrical Conductivity (micromhos) | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| (1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | (10) | (11) | (12) | (13) | (14) | (15) | (16) | (17) | (18) | (19) | (20) | (21) | (22) | (23) |
| Thames-derived | 364 | 0.029 | 0.084 | 6.1 | 1.04 | - | 281 | 90 | 5 | 23.5 | 5.1 | 34 | 2.3 | 10 | 64 | 0.15 | 0.02 | 0. 1 | 13 | 7.8 | 580 | |
| Lee Bridge | 52 | 0.014 | 0.096 | 6.7 | 1.14 | - | 297 | 99 | 6 | 31.0 | 6.4 | 39 | 3.2 | 10 | 78 | 0.20 | 0.03 | 0.2 | 15 | 7.9 | 620 | |
| Chingford Mill | 4 | 0.20 | 0.021 | 0.2 | 0.27 | 276 | 64 | 27 | 0.45 | 0.1 | 6 | 7.4 | 560 | |||||||||
| Coppermills | 49 | 0.020 | 0.105 | 6.8 | 1.16 | - | 304 | 109 | 6 | 31.0 | 6.4 | 43 | 3.4 | 10 | 78 | 0.20 | 0.03 | 0.1 | 12 | 7.6 | 630 |