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 1935
[Report of the Medical Officer of Health for Wembley]
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CHEMICAL AND BACTERIOLOGICAL WATER REPORTS.
| Sample of Water— Colne Valley Water Co. (2.7.35) | Sample of Water— L.M.S. Railway supply. (22.8.35) | |||
|---|---|---|---|---|
| CHEMICAL. | Parts per 100,000 | Grains per Gallon | Parts per 100,000 | Grains per Gallon |
| Total solids (dried at 1200C.) | 40.30 | 28.21 | 19.70 | 13.79 |
| Combined chlorine | 9.50 | 6.65 | 1.50 | 1.05 |
| equivalent to Na CI. | 15.68 | 10.98 | 2.48 | 1.74 |
| Nitric Nitrogen (Nitrates) | 0.34 | 0.24 | 0.48 | 0.34 |
| Nitrous Nitrogen (Nitrites) | Nil | Nil | Nil | Nil |
| Ammoniacal nitrogen | 0.0004 | 0.0003 | 0.0003 | 0.0002 |
| Albuminoid nitrogen | 0.0044 | 0.0031 | 0.0014 | 0.0014 |
| Oxygen absorbed in 4 hours 270C | 0.013 | 0.009 | 0.029 | 0.020 |
| Lead or Copoer | Nil | Nil | Nil | Nil |
| Temporary hardness (equivalent to CaCo3) | 14.0 | 9.8 | 3.0 | 2.1 |
| Permanent hardness | 2.0 | 1.4 | 6.0 | 4.2 |
| Total hardness | 16.0 | 11.2 | 9.0 | 6.3 |
| Average number of organisms producing visible colonies on gelatine plates, incubated at 200—220C. for 3 days = | 460 per C.C. | 4 per C.C. | ||
| Average number of organisms producing visible colonies on agar plates, incubated at 37.50C. for 2 days = | 19 per C.C. | 1 per C.C. | ||
| B. Coli | Not found in 100 c.c. | Not found in 100 c.c. | ||
| Streptococci | Not found in 30 c.c. | Not found in 30 c.c. | ||
| B. Welchii (spores) | Not found in 100 c.c. | Not found in 100 c.c. | ||
| BACTERIOLOGIST'S REMARKS. | These results shew this water to be satisfactory for drinking purposes. | From a consideration of the results obtained we are of opinion that this water is quite satisfactory for drinking purposes. | ||