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9
Typical Analysis of South West S.W. Co. Supply
(Parts per million.)
Chemical
Appearance Bright with
a few
mineral
particles
Turbidity Less than 3
Odour Faint
chlorinous
Colour 7
Free Carbon Dioxide 7
Total Solids 365
Alkalinity as Calcium Carbonate 205
pH 7.6
Electric Conductivity 545
Chlorine present as Chloride 33
Hardness: Total 270
(Carbonate 205; Non-Carbonate 65)
Nitrate Nitrogen 4.4
Nitrite Nitrogen Less than 0.01
Ammoniacal Nitrogen 0.000
Albuminoid Nitrogen 0.059
Oxygen Absorbed 1.2
Residual Chlorine 0.05
Metals Absent
Bacteriological
Number of Colonies
developing 1 day at 37°C. 2 days at 37°C. 3 days at 20°C.
on Agar 1 per ml. 1 per ml. 4 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.
3. The water supplied has no plumbo solvent action but
samples are tested for presence of metals.
4. No action has been required in respect of contamination
of the water. All water is chlorinated before distribution and
all new and repaired mains are chlorinated before being restored
to use.
5. With the exception of one or two outlying cottages, all
the houses in the area are supplied from the public water mains.
Only two houses are supplied by a common stand-pipe. These
two cottages, which are now condemned, are occupied by three
people.