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There must be sufficient intelligence and watchfulness as to the channels, commercial and other
which can clandestinally admit uncleanliness from without.—John Simon, 1889
Environmental Health
GENERAL CIRCUMSTANCES
Hillingdon is one of 32 London Boroughs created by the London Government Act, 1963
and the administrative Borough came into being on 1st April, 1965. The Borough is situated on
the north west border of the Greater London area, and has a total area of 42-5 square miles. There
is extensive urban development but approximately half of the Borough is designated Green Belt
with a predominantly rural character. The Borough is 12 miles from north to south and 4 miles
from east to west. It contains almost the whole of London (Heathrow) Airport as well as Northolt
aerodrome. The area is bi-sected by the M.4 motorway and the A.40 major arterial road as well
as a number of major rail links. In addition to providing housing for those who work in Central
London the area provides significant local industrial development, particularly in Hayes and
Uxbridge. Land in the southern part of the Borough, especially associated with the canal network
is being reclaimed and imaginatively developed.
WATER SUPPLY
The Borough is supplied with water from three water companies: Colne Valley Water Co..
South-west Suburban Water Co., and the Rickmansworth and Uxbridge Valley Water Co.
The results of chemical analysis of water from these three supplies are as follows:

Fluoride content of water supplies:
Colne Valley Water Company 0.3 p.p.m.
South West Suburban Water Company 0.2 p.p.m.
Rickmansworth and Uxbridge Valley Water Company 0.3 p.p.m.
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