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

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Twickenham 1956

[Report of the Medical Officer of Health for Twickenham]

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Table 7

Results of the Chemical and Bacteriological Examination of the Water Supply to the Borough of Twickenham for 1956

Parts per million (unless otherwise stated)

(a) Chemical

Description of the SampleNumber of SamplesAmmoniacal NitrogenAlbuminoid NitrogenOxidised Nitrogen (Nitrate)Chloridesas C1Oxygen abs. from Permanganate 4 hrs. at 27 °C.Turbidity, in terms of SilicaColour, mm. brown, 2 ft. tube, Burgess's TintometerHardness {total)Hardness (Non-carb.)pH. ValuePhosphate as P.O 111/4Silica as SiO2Sulphates as SO4Electrical Conductivity (gemmhos.)
River Thames water filtered at Hampton Works2250.0240.0874.1301.160.313258727.70.901158475

b) Bacteriological

Description of the SampleNumber of SamplesPlate count (average per millilitre) Colonies counted on agar after 20-24 hrs. at 37 °C.Bact. coli test
Percentages of samples negative in 100 ml.Average number of Bact. coli per 100 ml.
River Thames water filtered at Hampton Works9853.7100.0Nil