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1. (i) Water Supply.
The water to the district is supplied by the Metropolitan
Water Board and is derived from several sources, namely,
Wilmington, Darenth, Wansunt, Crayford, Bexley and
Deptford wells, the latter mixed with Thames-derived water,
filtered at Walton. All the water is chlorinated as it leaves
the works.
Bacteriological analyses are made at least five times
per week of all supplies and, in the case of the wells, the
water is sampled both before and after chlorination. Water
derived from the River Thames is sampled at each stage of
the purification process. Tanks to provide an adequate
period of contact of the chlorine with the water are now in
operation at all the well stations and Walton works.
All new and repaired mains are chlorinated before being
restored to use and samples of water from them are tested
bacteriologically.
The examination of samples of water from piped
supplies to houses at least monthly has given the following
results:—
Bacteriological.
(Minimum and maximum numbers of organisms.)
No. of organisms per c.c. capable of B. coli
growth on Agar at: presumptive
37° C. 22° C.
0-39 0-15 0-1 in 100 c.c.
(ii) Drainage and Sewerage.
Private sewers have been constructed on the following
estates: —
Ravenswood, Lynsted Close, Stratton Close, Southview
Close, Margaret Road, and Hurst Springs.
These sewers are of the back drainage system and have
not as yet been taken over as Public Sewers.
Thirteen cesspools were emptied a total of 32 times.
2. Rivers and Streams.
No serious case of pollution of rivers or streams was
found during the year.
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