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 1967
[Report of the Medical Officer of Health for Westminster, City of]
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Table 19.—Chemical Examination of Water Supplied to City of Westminster—Average Results Milligrammes per Litre (unless otherwise stated)
| Analysis data | Source f Supply | |
|---|---|---|
| Stoke Newington | All Thames derived | |
| Ammoniacal Nitrogen | 0.017 | 0.024 |
| Albuminoid Nitrogen | 0.063 | 0.089 |
| Nitrate | 5.2 | 4.1 |
| Chlorides as CI. | 35 | 30 |
| Oxygen abs. from Permanganate 4 hrs. at 27°C | 0.56 | 1.12 |
| Turbidity units | 0.0 | 0.1 |
| Colour (Burgess units) | 5 | 12 |
| Hardness (total) | 312 | 282 |
| Hardness (non-carbonate) | 77 | 73 |
| p.H. Value | 7.9 | 7.9 |
| Phosphate as P04 | 1.4 | 1.9 |
| Silicate as Si02 | 10 | 10 |
| Sulphate as S04 | 64 | 64 |
| Natural Fluoride as F | 0.30 | 0.30 |
| Magnesium as Mg. | 5 | 5 |
| Sodium as Na | 28.9 | 22.5 |
| Potassium as K | 4.8 | 5.1 |
| Surface active material as manoxol | 0.01 | 0.01 |
| Electrical Conductivity (microhms) | 660 | 590 |
Table 20.—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 | 254 | 6.5 | _ | 99.61 | 99.61 |
| All Thames-derived | 3,578 | 12.2 | — | 99.75 | 99.97 |
Lead Content (mg/1.Pb) Water from Main Taps in Consumers Premises
| Number of samples | Per cent | |
|---|---|---|
| Less than 0.01 | 64 | 66.7 |
| 0.01 | 22 | 22.9 |
| 0.02 | 3 | 3.1 |
| 0.03 | 4 | 4.2 |
| 0.04 | 2 | 2.1 |
| 0.05 | 0 | — |
| 0.06 | 1 | 1.0 |
| 96 | 100.0 |