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The population supplied direct according to the Registrar General's estimates at 30th
June, 1967, was 237,910.
No houses were permanently supplied by standpipe.
No fluoride was added, and where fluoride content is indicated in the analyses it
represents the naturally occurring fluoride in the water.
The borough is in supply with Lee-derived water from Lee Bridge works with some
well water from Ferry Lane Pumping Station and Chingford Mill Pumping Station, except for a
small portion of Lower Chingford adjoining Sewardstone Road north of King's Head Hill, which is
in supply with Thames-derived water under Sewardstone Green Reservoir head. Between May and
September, 1967, much of Walthamstow and parts of Chingford were supplemented by water from
the new interim supply from Coppermill Works.
The number of samples collected and the bacteriological and chemical analyses of the
supply from the above sources after treatment are shown on pages 102 and 103.
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 set out below is 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.
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