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

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Twickenham 1961

[Report of the Medical Officer of Health for Twickenham]

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AVERAGE RESULTS OP THE CHEMICAL EXAMINATION OP WATER SUPPLIED TO THE BOROUGH (F TWICKENHAM DURING 1961

Milligrammes per litre (unless otherwise stated)

Description of the sampleNo. of samplesAmmonia NitrogenAlbuminoid NitrogenOxidised Nitrogen NitrateChlorides as CI.Oxygen abs. from Permanganate 4 hrs. at 27°C.Turbidity unitsColour a.m. brown 2 ft. Tube Burgess's TintometerHardness (Total)Hardness (non-carbonate)pH ValuePhosphate as PO4licate as SiO2Surface active material as ManoxolSulphate as SO4Natural Fluoride as FMagnesium as MgB.O.D. 5 days at 20°CElectrical Conductivity (Micromhos)
Hampton520.0450.0804.1261.060.213268527.90.9590.11500.206525
Ashford Common520.0550.0843.9261.140.213278528.00.9590.11500.206550
Hanworth Road520.0220.0763.9261.020.312276507.90.8080.11500.206550
Kempton Park520.0230.0774.0261.080.312276507.90.9080.11500.206550

BACTERIOLOGICAL RESULTS - NEARLY AVERAGES. 1961

Source of SupplyNumber of SampIesAfter Treatment '
Agar plate count per ml.Coliform countE.coli count
20-24 hours at 37°C3 days at 22°CPer cent, samples negative in 100 ml.Per cent, samples negative in 100 ml.
Hampton1,06611.799.91100.0
Ashford Common76524.199.87100.0
Hanworth Road Kempton Park57912.599.8399.83

Table 6
20