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
Lewisham 1970
[Report of the Medical Officer of Health for Lewisham Borough]
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Average results of the chemical examination of the water supplied to the Borough of Lewisham during 1970
Milligrammes per litre (unless otherwise stated)
| Description of the Sample | Number of Samples | Ammoniacal Nitrogen | Albuminoid Nitrogen | Nitrate Nitrogen | Oxygen abs. from KMnO* 4 hrs. at 27° C. | Hardness (total) CaCO, | Hardness {non-carbonate) CaCO, | Magnesium as Mg | Sodium as Na | Potassium as K | Chloride as CI | Phosphate as PO4 | Silicate as SiO2 | Sulphate as SO4 | Natural Fluoride as F | Surface-active material as Manoxol OT | Turbidity units | Colour (Burgess units) | pH value | Electrical Conductivity (micromhos) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| River Thames-derived 363 | 0.026 | 0.083 | 4.8 | 1.02 | 274 | 79 | 5 | 27.7 | 5.6 | 40 | 2.7 | 9 | 70 | 0.20 | 0.03 | 0.1 | 11 | 7.9 | 570 | |
| Deptford | 4 | 0.002 | 0.020 | 6.1 | 0.12 | 366 | 101 | — | — | — | 39 | — | — | — | 0.20 | — | 0.0 | 3 | 7.2 | 650 |
| Wilmington | 4 | 0.005 | 0.022 | 7.5 | 0.13 | 295 | 65 | — | — | — | 29 | — | — | — | 0.15 | — | 0.1 | 1 | 7.2 | 540 |
| Darenth | 4 | 0.004 | 0.028 | 4.8 | 0.11 | 270 | 44 | — | — | — | 18 | — | — | — | 0.10 | — | 0.0 | 2 | 7.2 | 480 |
| Bexley | 4 | 0.010 | 0.014 | 5.7 | 0.19 | 327 | 85 | — | — | — | 23 | — | — | — | 0.10 | — | 0.0 | 3 | 7.3 | 580 |
| Merton | 3 | 0.015 | 0.021 | 0.8 | 0.12 | 244 | 22 | — | — | — | 16 | — | — | — | 0.50 | — | 0.3 | 6 | 7.3 | 480 |