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11
Typical Analysis of South-West Suburban Water Company's
Supply (Parts per million)
Appearance Clear and
bright
Turbidity Nil
Colour 10
Odour Very faint
chlorinous
pH 7.6
Free Carbon Dioxide 10
Electric Conductivity 545
Dissolved Solids dried at 180°C 370
Chlorine present as Chloride 29
Alkalinity as Calcium Carbonate 205
Hardness: Total 270
(Carbonate 205; Non-Carbonate 65)
Nitrate Nitrogen 4 5
Nitrite Nitrogen less than 0.01
Ammoniacal Nitrogen absent
Albuminoid Nitrogen 0'036
Oxygen Absorbed 0'95
Residual Chlorine 0'05
Metals absent
Bacteriological
No. of Colonies 1 day at 37°C. 2 days at 37°C. 3 days at 20°C.
developing on Agar 6 per ml. 7 per ml. 6 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.
With the exception of two condemned but occupied
cottages all the houses in the area were supplied from the
public water mains.