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Typical Analysis of South West S.W. Co. Supply.
(Parts per 100,000.)
1. Chemical.
Total solids (dried at 120°C.) 32.0
Combined chlorine (as Cl) 3.3
equivalent to Sodium Chloride (NaCl) 5.5
Nitric nitrogen (Nitrates) 0.34
Nitrous nitrogen (Nitrites) faint trace
present
Ammoniacal nitrogen 0.0074
Albuminoid nitrogen 0.0134
Oxygen absorbed in 4 hours at 27°C 0.120
Lead or Copper Nil
Temporary hardness (equivalent to CaCO3) 21.0
Permanent hardness ( „ „ „ ) 4.0
Total hardness ( „ „ „) 25.0
2. Bacteriological.
The average number of organisms
producing visible colonies on agar
plates, at 20°—22°C. for three days 9 per millilitre
At 37°C. for two days 14 per millilitre
Faecal B.coli not found in 100 ml
Probable number of coliform bacilli
present equals none per
100 ml.
Streptococci not found in 30 ml.
Cl. welchii (spores) present in 25 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.
5. With the exception of a very few outlying cottages
(which are likely to be scheduled for demolition when
the housing position permits) all the houses in the area
are supplied from the public water mains. All dwellinghouses
are supplied direct.