London's Pulse: Medical Officer of Health reports 1848-1972

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Hints from the Health Department. Leaflet from the archive of the Society of Medical Officers of Health. Credit: Wellcome Collection, London

Feltham 1950

[Report of the Medical Officer of Health for Feltham]

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Table: Average Results of Analyses of Metropolitan Water Board Supply. (Parts per million.) Water filtered and chlorinated at Hampton Works:

Average Results of Analyses of Metropolitan Water Board Supply. (Parts per million.) Water filtered and chlorinated at Hampton Works:

No. of Samples244
Ammoniacal Nitrogen.016
Albuminoid Nitrogen.091
Oxidised Nitrogen (Nitrate)4.1
Chlorides as Cl.25.8
Oxygen abs. from Permanganate 3 hours at 80°F1.18
Turbidity in terms of Silica0.4
Colour m.m. brown 2ft. tube Burgess's Tintometer16
Hardness Total274
Hardness (Permanent)83
pH Value7.9
Conductivity475
Bacteriological Results
No. of Samples817
Colony Count on agar at 37°C (20-24 hours)6.9
BACT. COLI TEST
Percentage of samples negative per 100 ml.99.9
Bact. Coli per 100 ml..002

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Typical Analysis of South West S.W. Co. Supply.
(Parts per million.):

Table: Chemical

Chemical

Appearance: Clear and bright.
Turbidity (Silica Scale)Nil
Colour (Hazen) Faint yellow brown on the alkaline side10
OdourNil
Reaction pH of neutrality7.7
Free Carbon Dioxide6
Electric Conductivity at 20°C550
Total Solids, dried at 180°C370
Chlorine in Chlorides27
Alkalinity as Calcium Carbonate205