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 1966
[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
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 CI | 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 -North of River | 207 | 0.031 | 0.087 | 3.9 | 1.26 | 289 | 78 | 5 | 24.9 | 4.9 | 32 | 1.6 | 7 | 68 | 0.20 | 0.01 | 0.1 | 15 | 7.9 | 570 | ||
| Lee Bridge | 52 | 0.022 | 0.105 | 4.5 | 1.34 | 333 | 106 | 7 | 35.0 | 7.1 | 43 | 2.9 | 6 | 109 | 0.20 | 0.04 | 0.4 | 18 | 8.1 | 690 | ||
| Ferry Lane | 38 | 0.069 | 0.075 | 2.3 | 0. 83 | 353 | 115 | 39 | 1.9 | 11 | 0.1 | 9 | 7.3 | 740 | ||||||||
| Chingford Mill | 3 | 0.097 | 0. 073 | 2.1 | 0.76 | 304 | 82 | 8 | 31 | 14 | 110 | 0.2 | 9 | 7.7 | 590 |