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 1961
[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 1961
(Milligrams per litre (unless otherwise stated))
| Description of the Sample | No. of samples | Ammonia Nitrogen | Albuminoid Nitrogen | Oxidised Nitrogen (Nitrate) | Chlorides as C1 | 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 | Phosphate as PO4 | Silicate as SiO2 | Sulphate as SO4 | Fluo ride as F | Magnesium as Mg. | Surface Active Material as Manoxol | Free CO2 | Electrical Conductivity (gemmhos) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| New River derived | 104 | 0.038 | 0,060 | 5.2 | 33 | 0.52 | 0.1 | 7 | 304 | 66 | 7.9 | 0.45 | 10 | 63 | 0,20 | 6 | 0.08 | 625 | |
| Park well | 3 | 0,100 | 0.064 | 2.6 | 26 | 0.48 | 1.5 | 10 | 280 | 56 | 7.4 | 18 | 575 |
| BEFORE TREATMENT | AFTER TREATMENT | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Number of samples | Agar plate count per ml. | Coliform count | Escherichia coli count | Number of samples | Agar plate count per ml. | Coliform count | Escherichia coll count | |||||
| 20-24 hours at 37°C. | 3 days at 22°C. | Per cent samples negative in 100 ml. | Count per 100 ml. | Per cent samples negative in 100 ml. | Count per 100 ml. | 20-24 hours at 37°C. | 3 days at 22°C. | Per cent samples negative in 100 ml. | Pet cent samples negative in 100 ml. | |||
| New River derived | 510 | 10.1 | - | 100.0 | 100.0 | |||||||
| Park well | 112 | 0.4 | 16. | 85.71 | 0.3 | 97.32 | - | 115 | 0.2 | 9 | 100.0 | 100.0 |