Hints from the Health Department. Leaflet from the archive of the Society of Medical Officers of Health. Credit: Wellcome Collection, London
[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, 1967
OF 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. | |||
*Thames-derived, South of River | 1,887 | 8.8 | 99.52 | 99.95 | ||||||||
Stoke Newington | 254 | 6.5 | 99.61 | 99.61 |
*Hampton, Surbiton and
Walton.
METROPOLITAN WATER BOARD - WATER EXAMINATION DEPARTMENT AVERAGE 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 Sample's 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 aa 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) | (3) | (4) | (5) | (6) | (8) | (9) | (10) | (11) | (12) | (13) | (14) | (15) | (16) | (17) | (18) | (19) | (20) | (21) | (22) | (23) | ||
*Thames-derived South of River | 156 | 0.021 | 0.088 | 4.2 | 1.12 | 272 | 69 | 5 | 22.6 | 5.1 | 30 | 1.9 | 9 | 64 | 0.30 | 0.01 | 0.1 | 12 | 7.9 | 580 | ||
Stoke-Newington | 52 | 0.017 | 0.063 | 5.2 | 0.56 | 312 | 77 | 5 | 28.9 | 4.8 | 35 | 1.4 | 10 | 64 | 0.30 | 0.01 | 0.0 | 5 | 7.9 | 660 | ||
*Hampton, Surbiton & Walton |