London's Pulse: Medical Officer of Health reports 1848-1972
View report page
Hints from the Health Department. Leaflet from the archive of the Society of Medical Officers of Health. Credit: Wellcome Collection, London
City of London 1971
[Report of the Medical Officer of Health for London, City of ]
This page requires JavaScript
METROPOLITAN WATER BOARD - WATER EXAMINATION DEPARTMENT AVERAGE RESULTS OF THE CHEMICAL EXAMINATION OF WATER APPLIED TO THE CORPORATION OF LONDON FOR 1971 Milligrammes per litre (unless otherwise stated)
| Description of the Samples | Number of Samples | 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 Man ox o I 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) |
| Stoke Newington | 52 | 0.027 | 0.064 | 6.3 | 0.61 | - | 304 | 85 | 5 | 30.3 | 5.2 | 42 | 1.9 | 9 | 62 | 0.20 | 0.02 | 0.1 | 9 | 7.8 | 630 | |
| River 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 |
BACTERIOLOGICAL RESULTS - YEARLY AVERAGES, 1971. WATER SUPPLIED TO THE CORPORATION OF LONDON
| Sources of Supply | BEFORE TREATMENT | AFTER TREATMENT | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Agar plate count per ml. | Coliform count | Escherichia coli count | Agar plate count per ml. | Coliform | E. coli count | |||||||
| Number of Samples | 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. | Number of Samples | 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 | 752 | 41.3 | 52.13 | 9.0 | 71.54 | 1.0 | 258 | 23.2 | 100.0 | 100.0 | ||
| River Thames — derived | 8,154 | 53.9 | 40.37 | 12.2 | 54.91 | 5.1 | 3,901 | 8.3 | 99.51 | 99.97 | ||