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9
Board. The water supplied by the South West Suburban
Water Co. is taken by that Company from the Metropolitan
Water Board. The water supply has been
satisfactory both as regards quantity and quality.
2. Samples for bacteriological examination and chemical
analysis are taken five times each week by the
Metropolitan Water Board of the raw and treated water,
and seven check samples have been taken in Feltham
by the South West Suburban Water Co. In addition,
ten samples were taken by my department. There is
an arrangement between my Council and the Councils
of the following districts :
Hayes and Harlington
Windsor
Egham
Bagshot
Easthampstead
by which the water supplied by the South West Suburban
Water Company to the combined districts is
sampled twenty-five times a year on a rota.
Average Results of Analyses of Metropolitan Water
Board Supply. (Parts per million.)
No. of Samples 252
Ammoniacal Nitrogen 0.173
Albuminoid Nitrogen 0.076
Oxidised Nitrogen (Nitrate) 3.1
Chlorides as CI. 24.3
Oxygen abs from Permanganate 3 hours at 80°F 1.08
Turbidity in terms of Silica 0.7
Colour m.m. brown 2ft. tube Burgess's Tintometer 19
Hardness Total 245
Hardness (Permanent) 70
pH Value 7.7
Conductivity 450
Bacteriological Results
No. of Samples 1080
Colony Count on agar at 37°C 18.5
BACT. COLI TEST
Percentage of samples negative per 100 ml. 99.1
Bact coli per 100 ml. 0.013