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 water supplied to the London Borough of Richmond upon Thames
Milligrammes per litre (unless otherwise stated)
Description of the Sample | Number of Samples | Ammoniacal Nitrogen | Albuminoid Nitrogen | Nitrate Nitrogen | Oxygen abs. from KMnO4 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 SiO2 | Sulphate as S04 | Natural Fluoride as F | Surface-active material as Manoxol OT | Turbidity units | Colour (Burgess units) | pH value | Electrical Conductivity (micromhos) | |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
(1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | (10) | (11) | (12) | (13) | (14) | (15) | (16) | (17) | (18) | (19) | (20) | (21) | (22) | (23) |
Hampton | 52 | 0.029 | 0.088 | 4.1 | 1.27 | 286 | 76 | 5 | 24.2 | 5.0 | 32 | 1.8 | 8 | 62 | 0.20 | 0.01 | 0.1 | 15 | 7.8 | 570 |
BACTERIOLOGICAL RESULTS — YEARLY AVERAGES, 1966
Source of supply | 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 | 1,136 | 11.4 | 99.82 | 100.0 |