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 1969
[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 not considered to be 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.
Surveys carried out between 1966 and 1968 on analyses
or water from consumers' premises confirmed this
statement,
"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 | 53 | 30 | 4 | 1 | 4 |
| Ammoniacal Nitrogen | 0.021 | 0.019 | 0.180 | 0.052 | 0.195 |
| Albuminoid Nitrogen | 0.095 | 0.110 | 0.043 | 0.042 | 0.032 |
| Nitrate Nitrogen | 4.5 | 4.4 | 0.5 | 1.0 | 0.3 |
| Oxygen abs, from KMnO4 4 hours at 27°C | 1.10 | 1.09 | 0.40 | 0.28 | 0.33 |
| Hardness (total) CaCO3 | 322 | 324 | 285 | 436 | 279 |
| Hardness (non-carbonate) CaCO3 | 98 | 103 | 73 | 201 | 67 |
| Magnesium as Mg | 6 | 6 | - | - | - |
| Sodium as Na | 35.0 | 35.0 | - | - | - |
| Potassium as K | 7.1 | 7.1 | - | - | - |
| Chloride as CI | 45 | 45 | 24 | 41 | 24 |
| Phosphate as PO4 | 3.2 | 3.1 | - | - | - |
| Silicate as SiO2 | 9 | 6 | - | - | - |
| Sulphate as SO4 | 88 | 88 | - | - | - |
| Natdrai Fluoride as F | 0.30 | 0.30 | 0.60 | 0.80 | 0.70 |
| /Surface | |||||