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13
SECTION 2
SANITARY CIRCUMSTANCES OF THE BOROUGH
WATER.
There are three sources of supply in the Borough. The
Northolt North, Northolt South. Greenford North, Greenford
Central and Greenford South Wards, most of Perivale Ward
and part of Hanger Hill Ward are supplied by the Rickmansworth
and Uxbridge Valley Water Company with the exception
of four roads (in part) in the Perivale Ward and one road
(in part) in the Hanger Hill Ward which are served by the
Colne Valley Water Company. The remainder of the Borough
is supplied by the Metropolitan Water Board. These supplies
are not subject to plumbo-solvent action and have been
satisfactory both in quantity and quality. Water from
public mains is supplied to 53,772 houses with a population
of 183,151 (1961 Census).
Seventeen samples were taken from supplies derived
from wells at 5 factories in the Borough. In these fac
tories water is obtained from deep borings ranging in
depth from 300 600 feet. Two samples were not completely
satisfactory, and two repeat samples taken from one
source were also doubtful. After advice and treatment of
storage tanks and supply pipes, further samples taken
from the two sources in question proved to be satisfactory.

DRAINAGE AND SEWERAGE
The soil sewerage from the district flows to the West
Middlesex Drainage Works at Mogden. Surface water finds
its way out of the district by the various water courses.
There are still 21 premises not connected to the
Council's sewers, mainly because they are in areas not
yet served by a main sewer.