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the distribution system is for the greater part of the year free or almost
free from residual chlorine. A similar contact tank is in an advanced
stage of construction at Walton works and plans are being prepared for
a contact tank at Surbiton works.
All the well water is chlorinated and, in addition, contact tanks
are provided at Deptford, Wilmington and Bexley wells ; any residual
chlorine is completely removed before the water leaves the works.
Bacteriological analyses are made at least five times a week, and in
the case of the river-derived supplies the water is analysed at all stages
of purification. All new and repaired mains are chlorinated before
being restored to use and samples are collected for analysis to establish
that the quality of the water is up to the standard normally supplied.
None of the supplies is plumbo-solvent.
All houses in Lewisham are supplied directly and not by means of
standpipes.
Appended are the average results of the chemical and bacteriological
analyses of the various supplies as forwarded by the Metropolitan Water
Board.