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The two failures on public water supply one from a house tap and one from a drinking water
fountain were found to be isolated results, repeat samples being satisfactory.
PRIVATE SUPPLIES
There remain two houses in the Borough without a mains water supply. In one case mains
water is carried to the premises from an adjoining property while the other water has a shallow
well supply. The former premises are the subject of a Demolition Order while in the case of the
latter intermittent failures of the water have been recorded and the provision of a water treatment
plant has been recommended. There are no dwelling houses supplied with water from standpipes
although there are some caravans and houseboats using standpipe supplies. In addition a number
of industrial premises draw water from deep wells for manufacturing purposes. Failures were
recorded in respect of a food factory using well water as a coolant and in the case of a very small
factory using the water for drinking purposes. In the case of both these factories a water treatment
plant has been requested. One house was found to have a dual water supply, a pumped supply
from a well being available as an alternative to the main supply. The well water was found to have
a high faecal coliform count and disconnection was requested.
SEWAGE DISPOSAL
I am indebted to the Director of Engineering, Mr. Basil D. Steele, for the following information:
The London Borough of Hillingdon is drained on separate sewerage systems, the foul sewage
is treated at the Mogden sewage treatment works of the Greater London Council and the surface
water is discharged into the drainage areas of the Thames Conservancy or the Greater London
Council. The Borough is divided into natural geographical areas served by district sewers which
discharge into the Council's main sewers and thence to outfalls on the Greater London Council's
trunk sewers. The responsibility of the Borough for the disposal of foul sewage ceases at the
point where it discharges into the Greater London Council's trunk sewers which convey the
sewage to Mogden. The disposal of the surface water is through the Council's main surface water
sewers which discharge at a number of places into the rivers flowing in the Borough. The rivers
of the Thames Conservancy Board are the Pinn, the Frays and the Colne and those of the Greater
London Council are the Yeading Brook which flows into the River Crane. In addition, through
the co-operation of the British Waterways Board, a number of surface water sewers discharge
into the Grand Union Canal.
Considerable development and redevelopment has taken place in this Borough since the
sewerage systems were designed and this together with the increased use of water, both for domestic
and industrial use, has caused some local flooding. It is thought that there are a number of
areas in which the sewers are over-loaded to an extent that the addition of a comparatively small
number of connections from new properties may result in local flooding. The Council is undertaking
a detailed examination of the sewerage systems of the whole of the Borough to ascertain the
adequacy of the systems, both for present needs and those of the foreseeable future. It is intended
where inadequacies are found to carry out such works as are required immediately and allow in
the design of those works for possible future development. A start has been made on this enormous
undertaking which it is programmed to complete before the end of 1977.
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