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32
The Metropolitan Water Board supplies the mains water for
the whole of the district.
The Public Health Department obtain samples of this water
at monthly intervals from various dwelling houses throughout the
district. 46 samples were taken and the Analyst's reports show
that they were all satisfactory.
The Metropolitan Water Board obtained many samples, both
before chlorination and as the water passed into supply after
chlorination, and details regarding these can be seen in the table
following.
The Director of Water Examination, Metropolitan Water
Board, has kindly reported on the water supply to the Urban
District during the year 1957:—
"The supply to the district of Orpington during 1957 was
derived from nine local wells, namely, Orpington, North Orpington,
Jewels Wood, Sundridge, Eynsford, Shortlands, Westerham,
Lullingstone and Horton Kirby. In addition there was a certain
amount of Thames-derived filtered water supplied to your area.
North Orpington new borehole was not in service during 1957.
Bacteriological analyses of these wells are made five times a
week and consistently satisfactory results have been obtained from
samples of water passing into supply. Chemical analyses of well
supplies are also made at regular intervals.
All supplies are treated with chlorine on the works, but any
excess remaining after a period of contact is removed completely
or reduced to an amount that will not be perceptible to the
consumers.
All new and repaired mains are disinfected with chlorine
before being restored to supply and samples of water from them are
analysed to establish that the water in them is up to the normal
standard of water in the distribution system.
None of the supplies is plumbo-solvent.
The following table gives the results of chemical and
bacteriological analyses of the various supplies to Orpington
during 1957, including analyses of water before treatment."