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(d) All new and repaired mains are disinfected with chlorine,
after a predetermined period of contact the pipes are flushed
out and refilled. Samples of water are then collected from
these treated mains and the mains are returned to service
only after the results are found to be satisfactory. The quality
control from the laboratories is carried out by means of daily
sampling from sources of supply, through the treatment works
and well stations, from the distribution system and through
to the consumer. Any sign of contamination or any other
abnormality is immediately investigated.
(e) The Board has no record of the number of structurally separate
dwellings in the area, but the population supplied direct
according to the Registrar-General's estimates at 30th June,
1966, was 153,875. No houses were permanently supplied
by standpipe.
(f) There were no changes to the general scheme of supply to
the Borough during 1966.
(g) The following additions to the mains took place during 1966
—trunk mains 400 yards; other mains 336 yards.
During the year 1966, samples of water were taken for bacteriological
and chemical examination by the Public Health Inspectors as
follows:—
Bacteriological—
Swimming Baths 153
Paddling Pools 23
Dwelling houses:—
Metropolitan Water Board 6
Well water 8
— 14
Other premises:—
Metropolitan Water Board 3
Sutton District Water Co. 4
Well water 3
— 10
200
Unsatisfactory Results—
Swimming Baths 14
Paddling Pools 16
30
Immediate action was taken in respect of the unsatisfactory swimming
bath water and subsequent samples proved satisfactory.
Chemical—
Swimming Baths 8
Dwelling houses:—
Metropolitan Water Board 1
Well water 1
—2
53