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 Haringey]
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18
AVERAGE RESULTS OF THE CHEMICAL AND BACTERIOLOGICAL EXAMINATION OF THE WATER
SUPPLIED TO THE LONDON BOROUGH OF HARINGEY FOR THE YEAR 1967
(Milligrams per litre (unless otherwise stated))
Description of the Sampl e | No. of samples | Ammoniacal Nitrogen | Albuminoid Nitrogen | Nitrate Nitrogen | Chlorides as C1 | Oxygen abs. from Permanganate 4 hrs. at 27°C | Turbidity Units | Colour (Burgess Units) | Hardness (Total) Ca C03 | Hardness (non-carbonate) Ca CO3 | PH Val ue | Phosphate as P04 | Silicate as Si02 | Sulphate as S04 | Natural Fl uoride as F | Magne-si um as Mg. | Sodium as Na | Potassi um as K | Surface Active Material as Manoxol OT | Electrical Conductivity (mi cro-mhos) |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
New River derived | 104 | 0.018 | 0.068 | 5.2 | 35 | 0.60 | 0.1 | 6 | 309 | 76 | 7.8 | 1.4 | 10 | 64 | 0.30 | 5 | 28.9 | 4.8 | 0.01 | 660 |
Park well | 1 | 0.165 | 0.038 | 0.4 | 20 | 0.20 | 0.2 | 0 | 268 | 58 | 7.4 | 66 | 0.70 | 20 | 20.0 | 5.9 | 540 | |||
•Thames derived N. of River | 207 | 0.026 | 0.090 | 4.1 | 30 | 1.12 | 0.1 | 12 | 289 | 75 | 7.9 | 1.9 | 10 | 62 | 0.30 | 5 | 22.3 | 5.0 | 0.01 | 600 |
Coppermills works | 1 | 0.028 | 0.123 | 4.3 | 41 | 1.21 | 0.1 | 10 | 319 | 100 | 8.3 | 2.3 | 7 | 104 | 0.35 | 7 | 33.4 | 7.2 | 0.03 | 7.30 |
BEFORE TREATMENT | AFTER TREATMENT | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Number of samples | Agar plate count per mi I. | Col iform count | Escherichia Coli count | Number of samples | Agar plate count per mil. | Co I iform count | Escherichia Coli count | |||||
20 -24 hours at 37°C | 3 days at 220C | 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 22oC | Per cent samples ne gati ve in 100 ml. | Per cent samples negative in 100 ml. | |||
New River derived | 510 | 6.7 | 99.61 | 99.80 | ||||||||
Park welI | 30 | 0.3 | 15 | 96.67 | 0.1 | 100.0 | — | 31 | 0.0 | 12 | 100.0. | 100.0 |
*Thames derived N. of River | 1.691 | 16.0 | 100.0 | 100.0 | ||||||||
Coppermills works | 48 | 92.4 | mn n |
•Ashford Common. Kempton Park, Hanworth and Barn Elms