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
Hackney 1971
[Report of the Medical Officer of Health for Hackney]
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| Source of Supply | Number of samples | Agar plate count per ml. | Coliform count | Escherichia 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. | ||
| Stoke Newington | 752 | 41.3 | - | 52.13 | 9.0 | 71.54 | 1.0 |
| River Thames derived | 8, 154 | 53.9 | - | 40.37 | 12. 2 | 54.91 | 5.1 |
| Source of Supply | No. of samples | Agar Plate count per ml. after 20-24 hours at 37°C. | Coliform count per cent samples negative in 100 ml. | E. Coli count per cent samples negative in 100 ml. |
|---|---|---|---|---|
| Stoke Newington | 258 | 23.2 | 100.0 | 100.0 |
| All Thames derived | 3,901 | 8.4 | 99.51 | 99.97 |
| Stoke Newington | Thames derived | |
|---|---|---|
| Number of samples | 52 | |
| Ammoniacal Nitrogen | 0.027 | 0.029 |
| Albuminoid Nitrogen | 0.064 | 0.084 |
| Nitrate Nitrogen | 6.3 | 6. 1 |
| Oxygen abs. from KMn04 4 hrs. at 27°C | 0.61 | 1.04 |
| Hardness (total) CaC03 | 304 | 281 |
| Hardness (non-carbonate) CaC03 | 85 | 90 |
| Magnesium as Mg | 5 | 5 |
| Sodium as Na | 30.3 | 23.5 |
| Potassium as K | 5.2 | 5.1 |
| Chloride as C1 | 42 | 34 |
| Phosphate as PO4 | 1.9 | 2.3 |
| Silicate as Si02 | 9 | 10 |
| Sulphate as SO4 | 62 | 64 |
| Natural Fluoride as F | 0.20 | 0. 15 |
| Surface-active material as Manoxol 0T | 0.02 | 0.02 |
| Turbitity units | 0.1 | 0. 1 |
| Colour (Burgess units) | 9 | 13 |
| pH Value | 7.8 | 7.8 |
| Electrical Conductivity (microhms) | 630 | 580 |