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
Twickenham 1963
[Report of the Medical Officer of Health for Twickenham]
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Table 6
AVERAGE RESULTS OP THE CHEMICAL EXAMINATION OF WATER SUPPLIED TO THE BOROUGH OF TWICKENHAM IN 1963
Milligrammes per litre (unless otherwise stated)
| Description of the Sample | No. of Samples | Ammoniacal Nitrogen | Albuminoid Nitrogen | Nitrate Nitrogen | Chlorides as Cl. | Oxygen abs. from KMnO4 4hrs. at 27° C. | Turbidity units | Colour (Burgess) scale | Hardness (total) | Hardness (noncarbonate) | pH value | Phosphate as PO4 | Silicate as SiO2 | Sulphate as SO4 | Magnesium as Mg. | Natural Fluoride as F. | Surface active material as Manoxol OT | Sodium as Na. | Potassium as K. | Electrical Conductivity ((micromhos) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Hampton | 52 | 0.165 | 0.076 | 3.9 | 32 | 1.22 | 0.3 | 11 | 276 | 68 | 7.8 | 1.3 | 12 | 560 | ||||||
| River Thames derived. North of River | 206 | 0.180 | 0.080 | 3.8 | 32 | 1.20 | 0.3 | 11 | 282 | 68 | 7.9 | 1.3 | 12 | 60 | 5 | 0.30 | 0.07 | 25 | 5.2 | 570 |
BACTERIOLOGICAL RESULTS - YEARLY AVERAGES, 1963
| Source of Supply | Number of Samples | After Treatment | |||
|---|---|---|---|---|---|
| Agar plate count per ml. | Coliform count | E.coli count | |||
| 20-24 hours at 37°C. | 3 days at 22°C. | Percent samples negative in 100 ml. | Percent samples negative in 100 ml | ||
| Hampton | 1.091 | 10.6 | - | 100.0 | 100.0 |
| Thames - derived, North of River | 1,930 | 14.4 | - | 99.43 | 99.43 |