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]
This page requires JavaScript
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 | Ammoniaacal Nitrogen | Albuminoid nitrogen | Nitrate Nitrogen | Oxygen abs. from KMnO44 hrs. at 27ºC. | B.O.D. 5l days at 20º C. | Hardness (total) CaCO3 | Hardness (non-carbonate) CaCO3 | Magnesium as Mg | Sodium as NA | Potassium as K | Chloride as Cl | Phosphate as PO4 | Silicate as SiO2 | Sulphate as SO4 | Natarural Fluoride as F | Suface-active material as Manoxol OT | Turbidity units | Colour (Burgess units) | pH value | Electical 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 | 0.019 | 0.090 | 4.2 | 1.10 | 284 | 72 | 5 | 22.6 | 5.1 | 30 | 1.9 | 10 | 64 | 0.30 | 0.01 | 0.1 | 11 | 7.9 | 590 |
BACTERIOLOGICAL RESULTS — YEARLY AVERAGES, 1967
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 | 1,158 | 7.3 | 99.91 | 100.0 |