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
City of London 1966
[Report of the Medical Officer of Health for London, City of ]
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METROPOLITAN WATER BOARD — Water Examination Department BACTERIOLOGICAL RESULTS- YEARLY AVERAGES, 1966 Water supplied to the City of London
| Source of Supply | BEFORE TREATMENT | AFTER TREATMENT | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Number of samples | 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 ml. | 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. | |||
| Stoke Newington | 256 | 12.9 | 100.0 | 100.0 | ||||||||
| Thames-derived, South of River | 1,825 | 10.8 | 99.18 | 99.95 | ||||||||
METROPOLITAN WATER BOARD - WATER EXAMINATION DEPARTMENT
RESULTS OF THE CHEMICAL EXAMINATION OF WATER SUPPLIED TO THE CITY OF LONDON
"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 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 S102 | Sulphate as S04 | Natural Fluoride as F | Surface-active material as Manoxol OT | Turbidity units | Colour (Burgess units) | PH value | Electrical Conductivity (micromhos) | |
| <D | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | (10) | (11) | (12) | (13) | (14) | (15) | (16) | (17) | (18) | (19) | (20) | (21) | (22) | (23) |
| Stoke-Newington | 52 | 0.038 | 0.069 | 5.4 | 0.74 | 315 | 82 | 4 | 27.8 | 4.7 | 36 | 1.4 | 10 | 64 | 0.20 | 0.01 | 0.1 | 9 | 7.8 | 630 | ||
| Thames-derived South of River | 156 | 0.029 | 0.090 | 4.4 | 1.27 | 279 | 77 | 5 | 24.2 | 5.0 | 32 | 1.8 | 9 | 62 | 0.20 | 0.01 | 0.1 | 15 | 7.8 | 560 |