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30
SECTION C.
SANITARY AND ENVIRONMENTAL
CIRCUMSTANCES OF THE AREA.
WATER SUPPLY.
A number of samples of water from the mains of the Metropolitan
Water Board were taken by the Department. Five were
submitted for bacteriological test and two were analysed to ascertain
the chemical constitution. All were found to be satisfactory for
drinking purposes.
At the end of the year there were two dwelling houses in the
District not connected with the public supply. Water is obtained
from one private well.
I am indebted to the Director of Water Examination of the
Metropolitan Water Board for the following information on the
supply of water to the Urban District during the year 1955 :—
"The supply to the district of Chislehurst and Sidcup in 1955
was derived from the following wells: Orpington, North Orpington,
Shortlands, Eynsford, Horton Kirby, Wilmington and Darenth,
together with Thames-derived filtered water via Shortlands Pumping
Station. There were no extensions of trunk mains in the area during
1955, but there were a number of 4-inch mains laid in various
estate roads.
Bacteriological analyses of samples of water at these various
sources of supply are made at least five times a week and consistently
satisfactory results have been obtained from samples of
water passing into supply. Chemical analyses of the samples are
also made at frequent intervals.
All supplies are treated with chlorine at 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 consumers.
Tanks have been installed at all the above well stations to ensure an
adequate period of contact of chlorine with the water.
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 it is up to the normal standard of quality
expected in the distribution system. None of the supplies is plumbosolvent.
Appended are the results of chemical and bacteriological
analyses of the various supplies to Chislehurst and Sidcup during
1955 before and after treatment."