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 upon Thames]
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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 Day of the month | Ammoniacal Nitrogen | Albuminoid Nitrogen | Nitrate Nitrogen | Oxygen abs. from KMn044 hrs. at 27° C. | B.O.D. 5 days at 20° C. | Hardness (total) CaC03 | Hardness (non-carbonate) CaC03 | Magnesium as Mg | Chloride as C1 | 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) | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
(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 | 0.041 | 0.090 | 4.3 | 1.20 | 258 | 66 | 4 | 41 | 1.9 | 10 | 64 | 0.20 | 0.09 | 0.1 | 15 | 7.5 | 550 | ||||||||||||
Richmond wells | 4 | 0.012 | 0.040 | 4.7 | 0.32 | 314 | 134 | 58 | 0.45 | 0.1 | 2 | 6.9 | 730 | |||||||||||||||||
1 1 | ||||||||||||||||||||||||||||||
Source of supply | BACTERIOLOGICAL RESULTS — YEARLY AVERAGES, 1965 | |||||||||||||||||||||||||||||
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 | 1,073 | 7.4 | 100.0 | 100.0 | ||||||||||||||||||||||||||
Richmond wells | 488 | 1.7 | 577 | 64.34 | 20. | 79.51 | 3.5 | 189 | 3.9 | 38 | 98.94 | 99.47 |