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 1959
(Milligrams per litre (unless otherside stated))
Description of the Sample | No. of Samples | Amnonia Nitrogen | Album, inoid Nitrogen | Oxidised Nitrogen (Nitrate) | Chlorides as CI | Oxygen abs. from Permanganate 4 hrs. at 27°C- | Turbidity in terms of Silica | Colour m.m. brown 2ft. Tube Burgess s Tintometer | Hardness (Total) | Hardness (ncn-car-bonate) | PH Value | Phosphate as P04 | Silicate as SI02 | Sulphate as SO4 | Fluoride as F | Magnesium as Mg. | Pot-asium K | Electrical Conductivity (gemmhos) |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
New River water fil tered at Homsey and/or Stoke Newington works | 104 | 0.018 | 0.050 | 5.4 | 32 | 0.50 | 0.1 | 5 | 298 | 70 | 78 | 0.55 | 12 | 59 | 0.2 | 50 | 625 | |
River Thames derived filtered water | 386 | 0.030 | 0 074 | 3.6 | 28 | 1.04 | 0.4 | 9 | 254 | 56 | 7 8 | 0 90 | 9 | 54 | 0.2 | 4.0 | 525 | |
Park well | 3 | 160 | ,034 | 0.1 | 21 | 0.20 | 1.8 | 10 | 278 | 74 | 7 4 | 6 0 | 525 |
BACTERIOLOGICAL RESULTS - YEARLY AVERAGES, 1959
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 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. | 20-24 hours at 37°C. | 3 days at 22°C. | Per cent samples negative in 100 ml. | Per cent samples negative in 100 ml. | |||
New River water filtered at Homsey works and/or Stoke Newington works | 514 | 4.8 | 99.61 | 100.0 | ||||||||
River Thames derived filtered water | 3344 | 9.8 | 99.46 | 99.97 | ||||||||
Park well | 145 | 0.5 | 5 | 80,69 | 0.6 | 98.62 | - | 147 | 0.2 | 2 | 100 0 | 100.0 |