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 1962
[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 OP TWICKENHAM FOR THE YEAR 1962
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 4 hrs. at 27·C. | Turbidity units | Colour (Burgess) scale | Hardness (total) | Hardness (non-carbonate) | pH value | Phosphate as PO4 | Silicate as SiO2 | Sulphate as SO4 | Magnesium as Mg. | Fluoride as F. | Surface active material as Manoxol OT | Electrical Conductivity (micromhos) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| River Thames Ashford Common Group | 208 | 0.040 | 0.076 | 3.9 | 30 | 1.10 | 0.2 | 11 | 272 | 58 | 7.9 | 1.3 | 10 | 61 | 6 | 0.25 | 0.12 | 560 |
BACTERIOLOGICAL RESULTS - YEARLY AVERAGES, 1962
| 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 | Per cent. samples negative in 100 ml. | Per cent. samples negative in 100 ml. | ||
| River Thames Ashford Common Group | 1.883 | 19.2 | 100.0 | 100.0 | |