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
Feltham 1958
[Report of the Medical Officer of Health for Feltham]
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9
and 139 treated water samples were taken by the South-West
Suburban Water Company. In addition, four samples were
taken by my department.
Average Results of Analyses of Metropolitan Water Board Supply. (Milligrammes per litre.)
| Chemical | |
| Ammonia iNitrogen | 0.027 |
| Albuminoid Nitrogen | 0.077 |
| Oxidised Nitrogen (Nitrate) | 4.2 |
| Chlorides as C1 | 26 |
| Oxygen abs. from Permanganate 4 hours at 27°C | 1.26 |
| Turbidity in terms of Silica | 0.3 |
| Colour m.m. brown 2ft. Tube Burgess's Tintometer | 12 |
| Hardness total | 270 |
| Hardness (non-carbonate) | 66 |
| pH Value | 7.9 |
| Phosphate as P04 | 0.85 |
| Silicate as SiO2 | 9 |
| Sulphate as S04 | 58 |
| Fluoride as F | 0.15 |
| Magnesium as Mg | 5 |
| Electrical Conductivity (gemmhos) | 550 |
| Bacteriological | |
| Plate counts (average per ml.) | |
| Colonies counted on agar at 37°C (20-24 hours) | 9.7 |
| Colonies counted on agar at 22°C (3 days) | — |
| Coliform count (percentage of samples negative per 100 ml.) | 99.07 |
| Escherichia count (percentage of samples negative in 100 ml.) | 99.88 |
Typical Analysis of South-West S. W. Co., Supply. (Parts per
million.)
Appearance Bright with
a few
particles
Turbidity Less than 3
Colour 8
Odour Nil
pH 8.2
Free Carbon Dioxide absent
Electric Conductivity 540
Total Solids 360
Chlorine present as Chloride 28
Alkalinity as Calcium Carbonate 210
Hardness: Total 265
(Carbonate 210: Non-Carbonate 551
Nitrate Nitrogen 2.2
Nitrite Nitrogen absent
Ammoniacal Nitrogen 0.000
Albuminoid Nitrogen 0.063
Oxygen absorbed 1.4
Residual Chlorine 0.05
Metals absent