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143
(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 via Surbiton and Walton, Hampton,
Kempton Park via Honor Oak and Shortlands Wells
Shortlands, West Wickham, Orpington, Sundridge,
Lullingstone, Eynsford, Horton Kirby and Jewels Wood.
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 yet 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, zince, 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."