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 Richmond]
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AVERAGE RESULTS OF THE CHEMICAL EXAMINATION of the water supplied to the London Borough of Richmond upon
Thames during 1968. Milligrammes per litre (unless otherwise stated)
Description of the Sample | Number of Samples | Ammoniacal Nitrogen | Albuminoid Nitrogen | Nitrate Nitrogen | Oxygen abs. from KMnO,4 hrs. at 27° C. | B.O.D 5 days at 20° C. | Hardness (total) CaC03 | Hardness (non-carbonate) CaC03 | Magnesium as Mg | Sodium as Na | Potassium as K. | Chloride as CI | Phosphate as P04 | Silicate as Si02 | Sulphate as S04 | Natural Fluoride as F | Surface-active material as Manoxol OT | Turbidity units | Colour (Burgess units) | pH value | Electrical Conductivity (micromhos) | |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
(3) | (4) | (5) | (6) | (7) | (8) | (9) | (10) | (11) | (12) | (13) | (14) | (15) | (16) | (17) | (18) | (19) | (20) | (21) | (22) | (23) | ||
Hampton | 0.017 | 0.087 | 3.9 | 1.20 | 280 | 76 | 4 | 22.9 | 5.3 | 32 | 2.0 | 10 | 62 | 0.30 | 0.1 | 14 | 7.9 | 570 |
AVERAGE RESULTS OF THE CHEMICAL EXAMINATION of the water supplied to the London Borough of Richmond upon Thames during 1968. Milligrammes per litre (unless otherwise stated)
Source of supply | BACTERIOLOGICAL RESULTS — YEARLY AVERAGES, 1968 | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
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 | E. 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. | |||
Hampton | 1,156 | 9.5 | 99.74 | 100.0 |