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
Tottenham 1957
[Report of the Medical Officer of Health for Tottenham]
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Average Results of the Chemical and Bacteriological Examination of the Water Supplied to the Borough of Tottenham for the Year 1957
Milligrams per litre (Unless otherwise stated)
| Description of the Sample | No, of Samples | Ammoniacal Nitrogen | Album inoid Nitrogen | Oxidised Nitrogen (Nitrate) | Chlorides as cl. | Oxygen abs. from Permanganate 4 hrs. at 27 C | Turbidity Units | Colour m. m brown 2ft. Tube Burgess' s Tintometer | Hardness (Total) | Hardness (Non carbonate) | pH. Value | Electrical Conductivity (gemmhos) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| New River water filtered at Hornsey works | 238 | 0.012 | 0.046 | 5.6 | 34 | 0.60 | 0.1 | 5 | 300 | 64 | 7.8 | 625 |
| New River water filtered at Stoke New -ington works | 238 | 0.028 | 0.045 | 5.5 | 34 | 0.59 | 0.1 | 6 | 298 | 62 | 7.9 | 600 |
| River Thames derived filtered water | 1882 | 0.027 | 0. 074 | 3.9 | 29 | 1.16 | 0.3 | 11 | 260 | 56 | 7.9 | 550 |
| Description of sample | No. of Samples | Plate count (average per m. 1.) Colonies counted on agar after 20-24 hrs. at 37°C | Coliform Test Percentage of Samples negative in 100 m. 1. | ||
|---|---|---|---|---|---|
| Coliform | E. Coli | ||||
| New River water filtered at Hornsey works | 256 | 9.4 | 99.61 | 100 | |
| New River water filtered at Stoke Newington works | 256 | 11.2 | 100 | 100 | |
| River Thames derived filtered water | 3438 | 6.4 | 99.33 | 99.91 | |