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 1951

[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 Samples.250
Ammoniacal Nitrogen.019
Abuminoid Nitrogen.085
Oxidised Nitrogen (Nitrate)4.1
Chlorides as Cl.22.0
Oxygen abs. from Permanganate 3 hours at 80°F1.21
Turbidity in terms of Silica0.3
Colour m.m. brown 2ft. tube Burgess's Tintometer15
Hardness Total268
Hardness (Non-Carbonate)63
pH Value7.9
Phosphate AS. P.O. III40.32
Silica as. SIO111.0
Conductivity450

Table: Bacteriological Results

Bacteriological Results

No of Samples766
Colony Count on agar at 37°C (20-24 hours)19.0
BACT. COLI TEST
Percentage of samples negative per 100 ml.100.0
Bact. Coli per 100 ml.Nil.

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Typical Analysis of South West S.W. Co. Supply.
(Parts per 100,000):

Table: Chemical

Chemical

Total solids (dried at 120°C.)40.0
Combined chlorine (as Cl.2.6
equivalent to Sodium Chloride (NaCl)4.3
Nitric nitrogen (Nitrates)0.44
Nitrous nitrogen (Nitrites)Nil.
Ammoniacal nitrogen0.0004
Albuminoid nitrogen0.0078
Oxygen absorbed in 4 hours at 27°C.0.080
Lead or CopperNil.
Temporary hardness (equivalent to CaC03)20.0
Permanent hardness („ „ „)8.0
Total hardness („ „ „)28.0