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temperature inversions and dispersal of pollution. As air pollution has diminished, there
have been other less tangible but beneficial changes, not so well documented, such as
the increase of plant types and bird species in London."
WATER SUPPLY
Three companies, namely, the Colne Valley Water Company, the Lee Valley Water
Company, and the Metropolitan Water Board distribute water to the Borough. The supply
is satisfactory both as to quality and quantity.
Samples of raw water and water going into supply are regularly sampled by the
companies for bacteriological and chemical examination, and such were reported to
conform to acceptable standards of purity. The waters are not liable to plumbo solvent
action.
The amount of naturally occuring fluoride varies; that supplied by the Colne Valley
Water Company has a content of less than 0.1 p.p.m., that supplied by the Metropolitan
Water Board has a content of 0.25 p.p.m., and in the case of the Lee Valley Water
Company, in general, the content is less than 0.2 p.p.m.
The whole district receives mains water direct and none is supplied by a permanent
stand pipe.
FOOD
Formal and Informal Samples