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42
The river water is abstracted at the Board's intakes on the River
Thames at Walton and Laleham and is stored in the Staines, Littleton
and Walton reservoirs. The water is filtered at Hampton, Surbiton and
Walton works and is chlorinated after filtration. At Hampton and
Walton contact tanks have been built where the chlorine has time to
exert its full effect before the water is pumped into supply.
All the well water is chlorinated and then dechlorinated before being
pumped into supply; contact tanks are now installed at Bexley,
Shortlands and Wilmington stations.
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 supply 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
stand-pipes.
Appended are the average results of the chemical and bacteriological
analyses of the various supplies as forwarded by the Metropolitan
Water Board :—