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"The supply was satisfactory both as to quality and quantity
throughout 1970.
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 results are found to be satisfactory.
The quality control from these laboratories is carried out by means
of daily sampling from sources of supply, from the treatment works or
well stations, from the distribution system, and through to the consumer.
Any sign of contamination or other abnormality is immediately investigated.
No houses were permanently supplied by standpipe. No artificial
fluoride is being added, and where the fluoride content is indicated in the
analysis it represents the naturally occuring fluoride in the water.
The supply was derived from the following works and pumping stations:
River Thames - derived Water from Surbiton, Hampton and from Ashford
Common Pumping Stations.
No new sources of supply were instituted and there were no changes in
the general scheme of supply in your area,
The number of samples collected and the bacteriological and chemical
analyses of the supply from the above sources after treatment are shown
on the attached sheets.
On account of their hardness content and alkaline reaction the Board's
river and well supplies are shown to be not plumbsolvent. It should, however,
be appreciated that all types of water pick up varying amounts of metal from
the material of water piping particularly when it is newly installed; this
applies to copper, zinc, iron and also to lead."
B.16