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 1952

[Report of the Medical Officer of Health for Feltham]

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8
2. Samples for bacteriological examination and chemical
analysis are taken by the Metropolitan Water Board
at all stages of purification at least five times each week.
Weekly samples have been taken by the South West
Suburban Water Co. In addition five samples were
taken by my department.

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 Samples245
Ammoniacal Nitrogen0.022
Abuminoid Nitrogen0.088
Oxidised Nitrogen (Nitrate)4.0
Chlorides as C124.0
Oxygen abs. from Permanganate 3 hours at 80°F1.09
Turbidity in terms of Silica0.2
Colour m.m. brown 2ft. tube Burgess's Tintometer13
Hardness Total259
Hardness (Non-Carbonate)62
pH Value7.9
Phosphate A.S. P.O. 11140.28
Silica as S10210
Conductivity475
Bacteriological Results
No. of Samples775
Colony Count on agar at 37°C (20-24 hours)7.0
BACT. COLI TEST
Percentage of samples negative per 100 ml.99.9
Bact. Coli per 100 ml.0.004

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

Typical Analysis of South West S.W. Co. Supply.

(Parts per 100,000):

Chemical
Total solids (dried at 120°C.)40.0
Combined chlorine (as CI.)2.6
equivalent to Sodium Chloride (NaCl)4.3
Nitric Nitrogen (Nitrates)0.44