Hints from the Health Department. Leaflet from the archive of the Society of Medical Officers of Health. Credit: Wellcome Collection, London
[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 |