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

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Hornsey 1958

[Report of the Medical Officer of Health for Hornsey, Borough of]

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All new and repaired mains are chlorinated before being restored to
use and samples of water from them are tested to ensure that its quality
is up to that normally supplied.
The water supplied to this area is not plumbo-solvent.
The water supply is in all cases direct to dwelling houses; none is
supplied by means of a stand-pipe.

Average Results of the Chemical and Bacteriological Examination of the water supplied to Hornsey during the year 1958.

Milligrammes per Litre (unless otherwise stated)

River Thames via Ashford CommonNew River (Stoke Newington)
Ammonia Nitrogen0.0430.038
Albuminoid Nitrogen0.0800.054
Oxidised Nitrogen: Nitrate4.05.9
Chlorides as CI2732
Oxygen abs. from permanganate 4 hrs. at 27°C.1.320.64
Turbidity in terms of Silica0.30.1
Colour m.m. brown 2ft. Tube Burgess's Tintometer126
Hardness (Total)276302
Hardness (non-carbonate)6878
pH. Value7.87.8
Phosphate as P040.850.55
Silicate as SiO2812
Sulphate as SO4.62
Fluoride as F..0.15
Magnesium as Mg..5
B.O.D. 5 days at 20oC...
Electrical Conductivity (gem mhos)550625
Bacteriological Results of Water Passing into Supply after ChlorinationColiform test Percentage samples i negative in 100 ml.
No. of Samples in each case: 259
Plate counts (Average per ml.) Colonies counted on agar 37°C.
(20-24 hrs.)ColiformE.coli
River Thames via Ashford Common23.099.61100.0
New River (Stoke Newington8.0100.0100.0