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 Twickenham]
This page requires JavaScript
AVERAGE RESULTS OP THE CHEMICAL EXAMINATION OP WATER SUPPLIED TO THE BOROUGH (F TWICKENHAM DURING 1961
Milligrammes per litre (unless otherwise stated)
Description of the sample | No. of samples | Ammonia Nitrogen | Albuminoid Nitrogen | Oxidised Nitrogen Nitrate | Chlorides as CI. | Oxygen abs. from Permanganate 4 hrs. at 27°C. | Turbidity units | Colour a.m. brown 2 ft. Tube Burgess's Tintometer | Hardness (Total) | Hardness (non-carbonate) | pH Value | Phosphate as PO4 | licate as SiO2 | Surface active material as Manoxol | Sulphate as SO4 | Natural Fluoride as F | Magnesium as Mg | B.O.D. 5 days at 20°C | Electrical Conductivity (Micromhos) |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Hampton | 52 | 0.045 | 0.080 | 4.1 | 26 | 1.06 | 0.2 | 13 | 268 | 52 | 7.9 | 0.95 | 9 | 0.11 | 50 | 0.20 | 6 | 525 | |
Ashford Common | 52 | 0.055 | 0.084 | 3.9 | 26 | 1.14 | 0.2 | 13 | 278 | 52 | 8.0 | 0.95 | 9 | 0.11 | 50 | 0.20 | 6 | 550 | |
Hanworth Road | 52 | 0.022 | 0.076 | 3.9 | 26 | 1.02 | 0.3 | 12 | 276 | 50 | 7.9 | 0.80 | 8 | 0.11 | 50 | 0.20 | 6 | 550 | |
Kempton Park | 52 | 0.023 | 0.077 | 4.0 | 26 | 1.08 | 0.3 | 12 | 276 | 50 | 7.9 | 0.90 | 8 | 0.11 | 50 | 0.20 | 6 | 550 |
BACTERIOLOGICAL RESULTS - NEARLY AVERAGES. 1961
Source of Supply | Number of SampIes | After Treatment ' | |||
---|---|---|---|---|---|
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. | Per cent, samples negative in 100 ml. | ||
Hampton | 1,066 | 11.7 | 99.91 | 100.0 | |
Ashford Common | 765 | 24.1 | 99.87 | 100.0 | |
Hanworth Road Kempton Park | 579 | 12.5 | 99.83 | 99.83 |
Table 6
20