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
City of Westminster 1968
[Report of the Medical Officer of Health for Westminster, City of]
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Table 18.—Chemical Examination of Water Supplied to
City of Westminster—Average Results
Milligrammes per Litre (unless otherwise stated)
| Analysis data | Source of Supply | |
|---|---|---|
| Stoke Newington | All Thames derived | |
| Ammoniacal Nitrogen | 0.014 | 0.020 |
| Albuminoid Nitrogen | 0.060 | 0.083 |
| Nitrate | 4.8 | 3.9 |
| Chlorides as Cl. | 40 | 32 |
| Oxygen abs. from Permanganate 4 hrs. at 27°C | 0.69 | 1.20 |
| Turbidity units | 0.1 | 0.1 |
| Colour (Burgess units) | 7 | 8.0 |
| Hardness (total) | 308 | 280 |
| Hardness (non-carbonate) | 78 | 76 |
| p.H. Value | 8.0 | 7.9 |
| Phosphate as Po4 | 1.7 | 2.0 |
| Silicate as Sio2 | 10 | 10 |
| Sulphate as So4 | 66 | 62 |
| Natural Fluoride as F | 0.30 | 0.30 |
| Magnesium as Mg. | 5 | 4 |
| Sodium as Na | 29.9 | 23.2 |
| Potassium as K | 5.2 | 5.3 |
| Surface active material as manoxol | 0.01 | 0.02 |
| Electrical Conductivity (microhms) | 630 | 570 |
Table 19.—Bacteriological Examination of Water Supplied to
City of Westminster—Average Results after Treatment
| Source of supply | Number of Samples | Agar plate count per ml. | Coliform count | E.coli count | |
|---|---|---|---|---|---|
| 20-24 hours 37°C. | 3 days at 22°C. | Per cent. samples negative in 100 ml. | Per cent. samples negative in 100 ml. | ||
| Stoke Newington | 257 | 18.9 | — | 100.0 | 100.0 |
| All Thames-derived | 3,651 | 11.4 | — | 99.4 | 99.97 |