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
Wembley 1938
[Report of the Medical Officer of Health for Wembley]
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Typical results of the chemical and bacteriological examinations of water supplied by the Statutory Undertakers:—
| Chemical Results in parts per 100,000. | Sample of Water Colne Valley Water Company. | Sample of Water Rickmans-worth & Uxbridge Valley Water Company. |
|---|---|---|
| 18/10/38. | 21/10/38. | |
| Reaction pH Neutral | 7.4 | 7.2 |
| Free Carbonic Acid | 1.1 | 2.6 |
| Electric Conductivity at 80O C. | 485 | 530 |
| Total Solids, dried at 180O C. | 32.5 | 35.0 |
| Chlorine in Chlorides | 5.3 | 2.4 |
| Alkalinity as Calcium Carbonate | 13.0 | 22.5 |
| Hardness: Total | 13.0 | 26.0 |
| Temporary | 11.0 | 20.5 |
| Permanent | 2.0 | 5.5 |
| Nitrogen in Nitrates | 0.52 | 0.8 |
| Nitrites | Absent | Minute trace |
| Free Ammonia | 0.0000 | 0.0000 |
| Albuminoid Ammonia | 0.0012 | 0.0012 |
| Oxygen absorbed in 4 hrs. at 80O F. | 0.010 | 0.010 |
| Metals: Iron | 0.003 | 0.005 |
| Number of Bacteria growing on Agar per c.c. or ml. in 1 day at 370 C | 0 | 0 |
| Number of Bacteria growing on Agar per c.c. or ml. in 2 days at 370 C | 0 | 2 |
| Number of Bacteria growing on Agar per c.c. or ml. in 3 days at 20O C | 1 | 3 |
| Bacillus Coli Absent in | 100 c.c. | 100 c.c. |
| Bacillus Welchii (B. Enteritidis Sporogenes) Absent in | 100 c.c. | 100 c.c. |
| Streptococci Absent in | 100 c.c. | 100 c.c. |