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

City of London 1964

[Report of the Medical Officer of Health for London, City of ]

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Table: METROPOLITAN WATER HOARD — Water Examination DepartmentBACTERIOLOGICAL RESULTS - YEARLY AVERAGES, 1964CITY OF LONDON

METROPOLITAN WATER HOARD — Water Examination Department

BACTERIOLOGICAL RESULTS - YEARLY AVERAGES, 1964

CITY OF LONDON

Source of SupplyBEFORE TREATMENTAFTER TREATMENT
Number of samplesAgar plate count per ml.Coliform countEscherichia coli countNumber of samplesAgar plate count per ml.Coliform countE. 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.
Stoke Newington25911.6100.0100.0
All Thames-Derived3,81114.199.95100.0

Table: AVERAGE RESULTS OF THE CHEMICAL EXAMINATION OF WATER SUPPLIED TO THE CITY OF LONDON FOR 1964.(MILLIGRAMMES PER LITRE (unless otherwise stated)

AVERAGE RESULTS OF THE CHEMICAL EXAMINATION OF WATER SUPPLIED TO THE CITY OF LONDON FOR 1964.

(MILLIGRAMMES PER LITRE (unless otherwise stated)

Stoke NewingtonAll Thames-derivedStoke NewingtonAll Thames-derived
No. of Samples53371Phosphate as P041.41.4
Ammoniacal Nitrogen0.0400.033Silicate as lS1O2108
Albuminoid Nitrogen0.0590.079Sulphate as SO46060
Nitrate Nitrogen6.84.8Magnesium as Mg.55
Chlorides as C1.3833Natural Fluoride as F.0.250.25
Oxygen abs. from KMn04 4 hrs. at 27°C.0.621.08Surface-active material as Manoxol OT0.090.09
Turbidity units0.10.2Sodium as Na Electrical Conductivity (micromhos)620550
Colour (Burgess) scale611
Hardness (total)306270
Hardness (non-carbonate)6664
pH value7.77.6