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 Enfield]
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TABLE 31
WATER SUPPLY
Metropolitan Water
Board Average Bacteriological Results
Results before Treatment | |||||
---|---|---|---|---|---|
* Thames derived North of River | New River derived | Hoe Lane Well derived | Hadley Road Well derived | Waltham Abbey Well derived | |
Number of samples | — | — | 80 | 246 | 249 |
Agar Plate Count per ml. 20-24 hrs. at 37°C | - | - | 0.0 | 0.1 | 0.1 |
3 days at 22°C | — | — | 4 | 11 | 4 |
Coliform Count % samples neg. in 100 ml. | _. | _ | 9975 | 82.52 | 100 |
Count per 100 ml. | — | — | 02 | 1.2 | — |
Escherichia coli Count % samples neg. in 100 ml. | _ | _ | 100 | 84.55 | 100 |
Count per 100 ml. | — | — | — | 0.9 | — |
Number of samples | 1,744 | 513 | 81 | 254 | 253 |
Agar Plate Count per ml. 20-24 hrs. at 37°C | 17.5 | 9.6 | 0.1 | 0.7 | 0.7 |
3 days at 22°C | — | — | 1 | 49 | 5 |
Coliform Count % samples neg. in 100 ml. | 99 71 | 100 | 100 | 99.61 | 100 |
Escherichia coli Count % samples neg. in 100 ml. | 100 | 100 | 100 | 100 | 100 |
* Ashford Common, Kempton Park, Hanworth Road and Barn Elms |