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Typical Analysis of South-West Suburban Water Company's
Supply (Parts per million)
Appearance Clear and
bright
Turbidity less than 0.5
Colour 7
Odour very faint
"chlorinous"
pH 7.3
Free Carbon Dioxide 18
Electric Conductivity 590
Dissolved Solids dried at 180°C
Chlorine present as Chloride 30
Alkalinity as Calcium Carbonate 195
Hardness: Total 270
(Carbonate 195; Non-Carbonate 75)
Nitrate Nitrogen 6.0
Nitrite Nitrogen absent
Ammoniacal Nitrogen 0.000
Albuminoid Nitrogen 0.049
Oxygen Absorbed 0.70
Residual Chlorine 0.13
Metals absent
Bacteriological
No. of Colonies ldayat37°C. 2daysat37°C. 3daysat20°C.
developing on Agar 1 per ml. 3 per ml. 1 per ml.
Present in Absent from Probable number
Presumptive Coli-
aerogenes Reaction —ml. 100 ml. 0 per 100 ml.
Bact. coli (Type 1) —ml. 100 ml. 0 per 100 ml.
CI Welchii Reaction —ml. 100 ml.
The water supplied had no plumbo-solvent action but
samples were tested for presence of metals.
No action was required in respect of contamination of
the water. All water was chlorinated before distribution
and all new and repaired mains were chlorinated before
being restored to use.
All the houses in the area were supplied from the public
water mains.
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