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 1971
[Report of the Medical Officer of Health for Chigwell]
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The number of samples collected and the bacteriological and
chemical analyses of the supply from the above sources after
treatment are shown on the attached sheets.
(b) On account of their hardness content and alkaline reaction
the Board's river and well water supplies are shown to be
not plumbo-solvent. It should, however, be appreciated that
all types of water pick up varying amounts of metal from the
material of water piping particularly when it is newly installed;
this applies to copper, zinc, iron and also to lead.
Water Samples:-
(a) Average results of Chemical Examination. Milligrammes per litre (unless otherwise stated):-
| Lee Bridge | Copper-mills | Chingford Mill | Waltham Abbey | |
|---|---|---|---|---|
| No. of samples taken during the year | 52 | 49 | 4 | 4 |
| Ammoniacal Nitrogen | 0.014 | 0.020 | 0.20 | 0.190 |
| Albuminoid Nitrogen | 0.096 | 0.105 | 0.021 | 0.040 |
| Nitrate Nitrogen | 6.7 | 6.8 | 0.2 | 0.2 |
| Oxygen abs. from KMnO4 4 hours at 27°C | 1.14 | 1.16 | 0.27 | 0.33 |
| Hardness (total) CaC03 | 297 | 304 | 276 | 273 |
| Hardness (non-carbonate) CaCO3 | 99 | 109 | 64 | 66 |
| Magnesium as Mg | 6 | 6 | - | - |
| Sodium as Na | 31.0 | 31.0 | - | - |
| Potassium as K | 6.4 | 6.4 | - | - |
| Chloride as Cl | 39 | 43 | 27 | 27 |
| Phosphate as PO4 | 3.2 | 3.4 | - | - |
| Silicate as SiO2 | 10 | 10 | - | - |
| Sulphate as SO4 | 78 | 78 | - | - |
| Natural Fluoride as F | 0.20 | 0.20 | 0.45 | 0.65 |
| Surface-active material as Manoxol OT | 0.03 | 0.03 | - | - |
| Turbidity units | 0.2 | 0.1 | 0.1 | 0.2 |
| Colour (Burgess Units) | 15 | 12 | 6 | 6 |
| pH value | 7.9 | 7.6 | 7.4 | 7.4 |
| Electrical Conductivity (micromhos) | 620 | 630 | 560 | 550 |
/(b)
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