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 1963

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

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Table: METROPOLITAN WATER BOARD — Water Examination Department BACTERIOLOGICAL RESULTS - YEARLY AVERAGES, 1963 CITY OF LONDON

METROPOLITAN WATER BOARD — Water Examination Department BACTERIOLOGICAL RESULTS - YEARLY AVERAGES, 1963 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 Newington2565.0100.0100.0
Thames-derived, south of river1,87312.599.4199.47

Table: AVERAGE RESULTS OF THE CHEMICAL EXAMINATION OF WATER SUPPLIED TO THE CITY OF LONDON FOR 1963. (MILLIGRAMMES PER LITRE (unless otherwise stated)

AVERAGE RESULTS OF THE CHEMICAL EXAMINATION OF WATER SUPPLIED TO THE CITY OF LONDON FOR 1963. (MILLIGRAMMES PER LITRE (unless otherwise stated)

Stoke NewingtonThames-derived South of riverStoke NewingtonThames-derived South of river
No. of Samples52156Phosphate as P041.01
Ammoniacal Nitrogen0.0920.20Silicate as Si021111
Albuminoid Nitrogen0.0610.079Sulphate as SO45862
Nitrate Nitrogen5.23.8Magnesium as Mg.Natural55
Chlorides as C1.3732Fluoride as F.0.250.25
Oxygen abs. from KMn04 4 hrs. at 27°C.0.611.18Surface-active material as Manoxol OT0.070.08
Turbidity units0.10.3Sodium as Na2925
Colour (Burgess) scale610Potassium as K4.95.2
Hardness (total)306266Electrical Conductivity (micromhos)620550
Hardness (non-carbonate)6866
pH value7.97.8