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
Sutton 1966
[Report of the Medical Officer of Health for Sutton]
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Bacteriological Results - Yearly Averages, 1966. After Treatment
| Number of Samples | Agar plate count per ml. | Coliform count | E. coli count | |
|---|---|---|---|---|
| 20-24 hours at 37°C. | 3 days at 22°C. | Per cent samples negative in 100 ml. | Per cent samples negative in 100 ml. | |
| 1,825 | 10.8 | 99.18 | 99.95 | |
Average Results of the Chemical Examination of Water, 1966. Milligrammes per litre (unless otherwise stated)
| No. of Samples | 156 | Chloride as C1 | 32 |
| Ammoniacal Nitrogen | 0.029 | Phosphate as PO4 | 1.8 |
| Albuminoid Nitrogen | 0.090 | Silicate as Si02 | 9 |
| Nitrate Nitrogen | 4.4 | Sulphate as SO4 | 62 |
| Oxygen abs. from KMn04 4 hrs at 27°C | 1.27 | Natural Fluoride as P | 0.20 |
| Surface-active material as Manoxol OT | 0.01 | ||
| Hardness (total) CaC03 | 279 | ||
| Hardness (non-carbonate) CaC03 | 77 | ||
| Turbidity units | 0.1 | ||
| Magnesium as Mg | 5 | Colour (Burgess units) | 15 |
| Sodium as Na | 24.2 | pH value | 7.8 |
| Potasium as K | 5.0 | Electrical Conductivity (micromhos) | 560 |
No fluoride was added, and where the fluoride content is indicated it
represents the naturally occurring fluoride in the water.
(c) The supply, being hard in character, is not liable to be plumbosolvent.
(d) All new and repaired mains are disinfected with chlorine; after a
predeteirained period of contact the pipes are flushed out and
refilled; samples of water are then collected from these treated
mains; and the mains are returned to service only after results
are found to be satisfactoiy. The quality control from these
laboratories is carried out by means of daily sampling from sources
of supply, through the treatment works or well stations, from the
distribution system, and through to the consumer. Any sign of
contamination or any other abnormality is immediately investigated.
(e) (i) The Board has no record of the number of structurally separate
dwellings supplied in your area, but the population supplied direct
according to the Registrar General's estimates at 30th June, 1966,
was 1s892o
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