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
Sutton 1968
[Report of the Medical Officer of Health for Sutton]
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Bacteriological Results-Yearly Averages, After Treatment
| 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. | Per cent samples negative in 100 ml. | ||
| Thames derived 1968 | 1931 | 10.8 | - | 99.79 | 100.0 |
| Thames derived 1969 | 3698 | 12.9 | - | 99.89 | 100.0 |
| Merton 1969 | 19 | 0.2 | 2 | 100.0 | 100.0 |
Average Results of the Chemical Examination of Water (Milligrammes per litre (unless otherwise stated)
| 1968 | 1969 | 1969 | 1968 | 1969 | |||
|---|---|---|---|---|---|---|---|
| Thames | Thames | Merton | Thames | Thames | Merton | ||
| No. of Samples | 156 | 371 | 4 | Chloride as C1 | 33 | 32 | 13 |
| Ammoniacal Nitrogen | 0.023 | 0.024 | 0.005 | Phosphate as PO4 | 2.0 | 2.1 | - |
| Albuminoid Nitrogen | 0.081 | 0.083 | 0.017 | Silicate as Si02 | 10 | 9 | - |
| Nitrate Nitrogen | 4.0 | 4.4 | 0.2 | Sulphate as SO4 | 62 | 58 | - |
| Oxygen abs. from KMnO4 | 1.22 | 1.05 | 0.08 | Natural Fluoride as F | 0.30 | 0.25 | 0.50 |
| Hardness(total) CaCO3 | 271 | 282 | 252 | Surface-active material as Manoxol OT | 0.02 | 0.02 | - |
| Hardness (Non- carbonate) CaCO3 | 73 | 79 | 38 | Turbidity Units | 0.1 | 0.1 | 0.4 |
| Colour (Burgess units) | 14 | 11 | 4 | ||||
| Magnesium as Mg | 4 | 5 | - | pH value | 7.9 | 7.9 | 7.4 |
| Sodium as Na | 22.9 | 24.0 | - | Electrical Conductivity (mircomhos) | 560 | 550 | 430 |
| Potassium as K | 5.3 | 5.4 | — |
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