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
Haringey 1967
[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