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and through to the consumer. Any sign of contamination or any other abnormality is
immediately investigated.
(c) (i) The Board has no record of the number of structurally separate dwellings supplied in
your area, but the resident population supplied direct according to the Registrar
General's estimates at 30th June, 1967, was 4,401.
(ii) No houses were permanently supplied by standpipe.
(d) No fluoride was added, and where the fluoride content is indicated in the analyses it
represents the naturally occurring fluoride in the water.
2. (a) The supply was derived from the following works and pumping stations:—
River Thames (Southern)
New River via Stoke Newington.
No new sources of supply were instituted and there were no changes to 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.
(b) The Board's river and well sources have not been considered to have a plumbo-solvent
action on account of their hardness content and alkaline reaction. It should, however, be
appreciated that all types of water pick up varying amounts of metal from piping, particularly
when it is newly installed; this applies to copper, zinc, iron and also lead.
Tests for lead have been carried out in connection with chemical analyses of samples of
running water collected from premises in the distribution system and I set out below the
information obtained over the period 1st January to 31st December, 1967:—

The above figures apply to the whole of the Board's area but it should be pointed out that
the general characteristics of the water are similar throughout the area so that the findings are
applicable to individual Boroughs.
The regular system of examination for lead in water in domestic premises will continue
during 1968.
5.