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 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 1962
(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 2 ft. Tube Burgess's Tintometer | Hardness (Total) | Hardness (non-carbonate) | pH Value | Phosphate as PO4 | Silicate as SiO2 | Sulphate as SO4 | Fluoride as F | Magnesium asMg. | Surface Active Material as Manoxol | Free CO 2 | Electrical Conductivity (gemmhos) |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
New River derived | 104 | 0.043 | 0.058 | 5.5 | 38 | 0.58 | 0.1 | 7 | 302 | 64 | 7.9 | 0.70 | 11 | 63 | 0.25 | 6 | 0.10 | 630 | |
Park well | 1 | 0,086 | 0.030 | 0.3 | 26 | 0.28 | 0.1 | 4 | 252 | 47 | 7.3 | 510 |
BACTERIOLOGICAL RESULTS - YEARLY AVERAGES, 1962
BEFORE TREATMENT | AFTER TREATMENT | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Number of samples | Agar plate count per ml. | Coliform count | Escherichia coli count | Agar plate count per ml. | Coliform count | Escherichia coli 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. | Number of samples | 20-24 hours at 37°C. | 3 days at 22°C. | Per cent samples negative in 100 ml. | Per cent smples negative in 100 ml. | ||
New River derived | 512 | 7.0 | - | 100.0 | 100.0 | |||||||
Park well | 66 | 0.7 | 36 | 83.36 | 0.5 | 95.45 | 0.2 | 68 | 0,4 | 6 | 100.0 | 100.0 |