View report page

211
estimation of its clarity, colour and taste, and bacteriologically for
assessment of coliform colonies with confirmatory examination for
Escherichia coli.
There are 70,303 inhabited dwellings in the Borough with
direct connections to the Board's mains.
On request and following satisfactory reports, 59 letters were
sent during the year in respect of properties confirmed as having a
suitable and sufficient supply of water.
I am indebted to Dr. E. Windle Taylor, Director of Water
Examination for the Metropolitan Water Board, for the following
information given in accordance with the Ministry's Circular 1/67,
regarding the water supplies in the Greenwich area:—
"You will understand that this information does not relate to
private supplies and supplies from other Water Undertakings
(if any).
(a) The supply was satisfactory both as to quality and quantity
throughout 1966.
(b) (i) The supply was derived from the following works and
pumping stations:—
River Thames via Hampton and Surbiton; and
Deptford, Wilmington, Darenth, Bexley, Wansunt
and Crayford Wells.
No new sources of supply were instituted.
(ii) The number of samples collected and the bacteriological
and chemical analyses of the supply from the above
sources after treatment are shown on the attached sheets.
No fluoride was added, and where the fluoride content is
indicated it represents the naturally occurring fluoride in
the water.
(c) The supply being hard in character is not liable to be
plumbo-solvent.
(d) All new and repaired mains are disinfected with chlorine,
after a predetermined period of contact the pipes are flushed
out and refilled; samples of water are then collected from
these treated mains; and the mains are returned to service
only after results are found to be satisfactory.
The quality control from these laboratories is carried out by
means of daily sampling from sources of supply, through the
treatment works or well stations, from the distribution
system, and through to the consumer. Any sign of contamination
or any other abnormality is immediately investigated.