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 1954
[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 | 225 |
| Ammoniacal Nitrogen | 0.020 |
| Albuminoid Nitrogen | 0.092 |
| Oxidised Nitrogen (Nitrate) | 4.0 |
| Chlorides as C1. | 26.4 |
| Oxygen abs. from Permanganate 4 hours at 27°C. | 1.23 |
| Turbidity in terms of Silica | 0.3 |
| Colour m.m. brown 2 ft. tube Burgess's Tintometer | 14 |
| Hardness Total | 271 |
| Hardness (Non-Carbonate) | 72 |
| pH Value | 7.9 |
| Phosphate as P.O. 4111 | 0.65 |
| Silica as SIO1 | 11 |
| Magnesium | 5 |
| Sulphate | 50 |
| Conductivity | 475 |
Bacteriological Results
No. of Samples 963
Colony Count on agar at 37°C (20-24 hours) 5.6
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 100,000):
Chemical
| Total solids (dried at 120°C.) | 35.0 |
| Combined chlorine (as C1.) | 2.7 |
| equivalent to Sodium Chloride (NaCl) | 4.5 |
| Nitric Nitrogen (Nitrates) | 0.40 |
| Nitrous Nitrogen (Nitrites) | Nil |
| Ammoniacal Nitrogen | 0.0006 |
| Albuminoid Nitrogen | 0.0130 |
| Oxygen absorbed in 4 hours at 27°C | 0.170 |
| Lead or Copper | Nil |
| Temporary hardness (equivalent to CaC03) | 21.5 |
| Permanent hardness (equivalent to CaC03) | 7.0 |
| Total hardness (equivalent to CaC03) | 28.5 |
Bacteriological
Agar plate count, at 20-22°C. for three days=4 per ml.
Agar plate count, at 37°C. for two days=3 per ml.
Faecal coli not found in 100 ml.
Probable number of coliform bacilli = None per 100 ml.
Enterococci not found in 100 ml.
C1. welchii (spores) present in 25 ml.