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 1955
[Report of the Medical Officer of Health for Feltham]
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Average Results of Analyses of Metropolitan Water Board Supply. (Parts per million). Water filtered and chlorinated at Hampton Works:
| No. of Samples | 232 |
| Ammoniacal Nitrogen | 0.011 |
| Albuminoid Nitrogen | 0.083 |
| Oxidised Nitrogen (Nitrate) | 3.9 |
| Chlorides as CI. | 26 |
| Oxygen abs. from Permanganate 4 hours at 27°C. | 1.05 |
| Turbidity in terms of Silica | 0.3 |
| Colour m.m. brown 2ft. tube Burgess's Tintometer | 13 |
| Hardness Total | 261 |
| Hardness (Non-Carbonate) | 67 |
| pH Value | 7.8 |
| Phosphate as PO4111 | 0.50 |
| Silica as SIO1 | 10 |
| Sulphates as SO4 | 49 |
| Conductivity | 450 |
| Bacteriological Results | |
| Colony Count on agar at 37°C (20-24 hours) | 4.8 |
| BACT. COLI TEST | |
| Percentage of samples negative per 100 ml. | 100.0 |
| Bact. Coli per 100 ml | Nil |
Typical Analysis of South West S.W. Co. Supply
(Parts per million):
| Chemical | |
| Appearance | Clear and Bright |
| Turbidity | Nil |
| Odour | Nil |
| Colour | 4 |
| Free Carbon Dioxide | 9 |
| Total Solids | 355 |
| Alkalinity as Calcium Carbonate | 195 |
| pH | 7.5 |
| Electric Conductivity | 530 |
| Chlorine present as Chloride | 27 |
| Hardness: Total (Carbonate 195 Non-Carbonate 55) | 250 |
| Nitrate Nitrogen | 3.2 |
| Nitrite Nitrogen | less than 0.01 |
| Ammoniacal Nitrogen | 0.004 |
| Albuminoid Nitrogen | 0.033 |
| Oxygen Absorbed | 0.60 |
| Residual Chlorine | absent |
| Metals | absent |