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 1968
[Report of the Medical Officer of Health for London, City of ]
This page requires JavaScript
<1
METROPOLITAN WATER BOARD — Water Examination Department BACTERIOLOGICAL RESULTS - YEARLY AVERAGES, 1968 OF WATER SUPPLIED TO THE CORPORATION 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 | 1,931 | 10.8 | 99.79 | 100.0 | ||||||||
| Stoke Newington | 257 | 18.9 | 100.0 | 100.0 | ||||||||
METROPOLITAN WATER BOARD - WATER EXAMINATION DEPARTMENT
| 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 C1 | Phosphate as P04 | Silicate as Si02 | Sulphate as SO4 | 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) |
| R. Thames, South of River | 156 | 0.023 | 0.081 | 4.0 | 1.22 | 271 | 73 | 4 | 22.9 | 5.3 | 33 | 2.0 | 10 | 62 | 0.30 | 0.02 | 0.1 | 14 | 7.9 | 560 | ||
| Stoke Newington | 52 | 0.014 | 0.062 | 4.8 | 0.69 | 308 | 78 | 5 | 29.9 | 5.2 | 40 | 1.7 | 10 | 66 | 0.30 | 0.01 | 0.1 | 7 | 8.0 | 630 |