View report page

SANITARY ADMINISTRATION.
Water Supply.
I am indebted to Lt..Col. E. F. W. Mackenzie; Director of Water
Examination, Metropolitan Water Board, for the following report upon the
supply for the borough :.
The water supply to the Twickenham area is abstracted from the River
Thames at Laleham and Walton, purified in the storage reservoirs at
Littleton and Walton, and at the filtration works at Hampton.
All the water is chlorinated before it leaves the works, and adequate
contact to ensure complete action by the chlorine has been provided at
Hampton by the building of a contact tank, which first came into operation
in July, 1948. Since the 19th October, 1948, the filtered water has been
treated by the methods of superchlorination in place of the ammonia.chlorine
process. Free chlorine is a much more powerful disinfectant than chloramine,
and there is, in addition, a considerable saving in cost of chemicals, such as
ammonia.
Treatment is controlled by hourly testing of the final water on the works
and samples of the water are collected at all stages of purification at least
five times each week and analysed at the laboratories of the Metropolitan
Water Board.
All new and repaired mains are disinfected with chlorine before being
restored to supply, and samples of water from them are tested bacteriologically.
None of the supplies is plumbo.solvent.
Number of houses supplied by the Board:-
(a) Direct 29,563 (106,671 persons)
(b) By means of standpipes 13 (29 persons)