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8
Water Analysis
1. The Eedfont and Feltham Wards of the District are
supplied by the South West Suburban Water Co., and the
Hanworth Ward by the Metropolitan Water Board. The water
supplied to this area by the South West Suburban Water Co.
is taken by the Company from the Metropolitan Water Board.
The water is derived from the River Thames, purified in the
storage reservoirs at Littleton, Staines and Walton, and is
filtered and chlorinated at the Hampton Works. A contact
period of over an hour is given at the works for the completion
of chlorination. The water supply has been satisfactory both as
regards quantity and quality.
2. Samples for bacteriological examination (976) and chemical
analysis (225) were taken by the Metropolitan Water Board at
all stages of purification at least five times each week. Eightynine
samples have been taken by the South West Suburban
Water Co. In addition ten samples were taken by my
department.
Average Results of Analyses of Metropolitan Water Board
Supply. (Parts per million.) Water filtered and chlorinated
at Hampton Works.
Number of samples 225
Ammoniacal Nitrogen 0.024
Albuminoid Nitrogen 0.087
Oxidised Nitrogen (Nitrate) 4.1
Chlorides as CI 30
Oxygen abs. from Permanganate 4 hours at 27°C. 1.16
Turbidity in terms of Silica 0.3
Colour m.m. brown 2 ft. tube Burgess's Tintometer 13
Hardness Total 260
Hardness (Non-carbonate) 74
pH Value 7.7
Phosphate as PO4 0.90
Silica as SiO2 11
Sulphates as SO4 58
Conductivity 475
Bacteriological Results
Colony Count on agar at 37°C. (20-24 hours) 3.7
BACT. COLI TEST
Percentage of samples negative per 100ml 100.0
Bact. Coli per 100ml. nil