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
Chigwell 1967
[Report of the Medical Officer of Health for Chigwell]
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"Water Samples:
(a) Average results of Chemical Examination. Milligrammes per litre (unless otherwise stated):-
| Lee Bridge | Copper-mills | Chingford Mill | Ferry Lane | Waltham Abbey | |
|---|---|---|---|---|---|
| No. of samples taken during the year | 52 | 7 | 4 | 4 | 4 |
| Ammoniacal Nitrogen | 0.025 | 0.028 | 0.105 | 0.165 | 0.175 |
| Albuminoid Nitrogen | 0.105 | 0.123 | 0.052 | 0.044 | 0.046 |
| Nitrate Nitrogen | 4.7 | 4.3 | 0.5 | 0.6 | 0.2 |
| Oxygen abs. from KMnO4 4 hours at 27° C | 1.19 | 1.21 | 0.39 | 0.33 | 0.42 |
| Hardness (total) CaCO3 | 335 | 319 | 309 | 369 | 281 |
| Hardness (non-carbonate) CaCO3 | 105 | 100 | 94 | 127 | 62 |
| Magnesium as Mg | 7 | 7 | 14 | 36 | 25 |
| Sodium as Na | 33.4 | 33.4 | 23 | 47 | 26 |
| Potassium as K | 7.2 | 7.2 | 5.8 | 11.5 | 5.7 |
| Chloride as C1 | 43 | 41 | 30 | 35 | 24 |
| Phosphate as PO4 | 2.7 | 2.3 | - | - | - |
| Silicate as SiO2 | 8 | 7 | - | - | - |
| Sulphate as SO2 | 104 | 104 | 110 | 180 | 84 |
| Natural Fluoride as F | 0.35 | 0.35 | 0,55 | 0.85 | 0.70 |
| Surface-active material as | 0.03 | 0.03 | - | - | — |
| CO2 | - | - | 22 | 27 | 16.5 |
| Turbidity units | 0.2 | 0.1 | 0.0 | 0.1 | 1.1 |
| Colour (Burgess units) | 14 | 10 | 3 | 3 | 6 |
| pH value | 8.1 | 8.3 | 7.5 | 7.4 | 7.5 |
| Electrical Conductivity (mi cromhos) | 720 | 730 | 560 | 840 | 580 |
(b)
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