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Water as delivered to the consumer is examined monthly by the
Counties Public Health Laboratory on behalf of the Company and
a further 11 chemical and 27 bacteriological samples were examined by
the Public Health Departments in the supply area. All were satisfactory.
The following is a representative analysis:
Chemical analysis in parts per million
Total solid matter in solution (dried at 180° C.) 208
Combined chlorine 19.4
Nitric nitrogen 9.9
Nitrous nitrogen 0.14
Ammonia, free and saline 0.004
Ammonia, albuminoid 0.012
Oxygen absorbed from permanganate in 4 hours at 26.7° C. 0.22
Hardness—by acidimetric titration—Temporary 72
Permanent 58
Total 130
Reaction for free chlorine at time of receipt none
Iron and other metals absent
pH 7.8
The water was bright and clear and slightly bluish in colour.
Bacteriological examination
Action by free chlorine during transit of the sample was prevented
at the time of sampling
Number of colonies per ml. developing upon agar in 2 days at 37° C. 0
Number of colonies per ml. developing upon agar in 3 days at 22° C. 0
Organisms of the coliform group absent in 100 ml.
Streptococci absent do.
Cl. welchii absent do.
This water is of good organic purity and very moderate hardness and
salinity. It is attractive in appearance and shows no material alteration in
chemical composition as compared with previous samples from the same source.
The bacteriological condition is excellent and, as judged by these samples,
the water is pure and wholesome and suitable for the public supply.
The average hardness of the samples taken by all the local
authorities' Public Health Departments was 9.32°. compared with
9.06° in the year before. Six exceeded the statutory limit of 9° and
five were below.
Drainage and Sewerage
Routine work was carried out in cleansing sewers, soakaways and
gullies in the district. Work was commenced in piping-in the open ditch
along Tweeddale Road at a cost of over £11.000. The completion of this
project will remove a source of considerable potential nuisance.
Sewage is pumped to the disposal works of the Croydon Corporation
in Beddington, except at various points on the fringes of the district,
where it is more conveniently drained to the sewage systems of
neighbouring authorities.
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