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
Edmonton 1962
[Report of the Medical Officer of Health for Edmonton]
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Average RESULTS OF THE CHEMICAL EXAMINATION OF WATER SUPPLIED TO THE BOROUGH OF EDMONTON FOR THE YEAR 1962. MILLIGRAMMES PER LITRE (unless otherwise stated)
| Description of Sample | Number of Samples | Ammonia Nitrogen | Albuminoid Nitrogen | Oxidised Nitrogen | Chlorides as CI | Oxygen abs. from Permanganate. 4hrs at 27°C. | Turbidity Units | Colour m.m.brown 2 ft. Tube Burgess's Tintometer | Hardness (Total) | Hardness (non carbonate) | PH Value | Phosphate as P04 | Silicate as Si02 | Surface Active Material as Manoxol | Sulphate as so4 | Natural Fluoride as F. | Magnesium as Mg. | Electrical Conductivity. Micromhos | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Nitrite | Nitrate | ||||||||||||||||||
| New River derived | 104 | 0.043 | 0.058 | 5.5 | 38 | 0.58 | 0.1 | 7 | 302 | 64 | 7.9 | 0.70 | 11 | 0.10 | 63 | 0.25 | 6 | 630 | |
| Ashford Common group River Thames derived | 208 | 0.040 | 0.076 | 3.9 | 30 | 1.10 | 0.2 | 11 | 272 | 58 | 7.9 | 1.3 | 10 | 0.12 | 61 | 0.25 | 6 | 560 | |
| Park | 1 | 0.086 | 0.030 | 0.3 | 26 | 0.28 | 0.1 | 4 | 252 | 47 | 7.3 | 510 | |||||||
METROPOLITAN WATER BOARD WATER EXAMINATION DEPARTMENT
BACTERIOLOGICAL RESULTS- YEARLY AVERAGES, 1962.
| Source of Supply | Number of samples | BEFORE TREATMENT | AFTER TREATMENT | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Agar plate count per ml. | Coliform count | Escherichia coli count | Number of samples | Agar plate count per ml. | Coliform count | E.coli count | ||||||
| 20-24 hours at 37°C. | 3 days at 22°C. | Per cent, samples negative in 100 m] | Count per 100 ml | Per cent samples , negative in 100 ml | Count per 100 ml. | 20-24 hours at 37°C. | 3 days at 22°C. | Per cent samples negative in 100 ml. | Per cent samples negative in 100 ml. | |||
| New River derived | 512 | 7.0 | 100.0 | 100.0 | ||||||||
| River Thames derived, Ashford Common group. | 1,883 | 19.2 | 100.0 | 100.0 | ||||||||
| Park | 66 | 0.7 | 36 | 86.36 | 0.5 | 95.45 | 0.2 | 68 | 0.4 | 6 | 100.0 | 100.0 |
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