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99
ENVIRONMENTAL HEALTH SERVICE
WATER SUPPLY
Apart from a small area in the extreme south-west part of the district
which is supplied by the Rickmansworth and Uxbridge Valley Water
Company, the Borough is supplied by the Colne Valley Water Company.
Nearly all the water supplied by them is obtained from a series of wells
fed from gathering grounds in the Chilterns.
The supply has been satisfactory in quantity and quality and no
adverse reports were received.
Throughout the year samples were taken by the Colne Valley Water
Company and in every case the report received was satisfactory. In
addition, six samples were taken by the department. The following is a
copy of the report received on a sample submitted for chemical analysis
during December, 1968:—
Chemical Results in parts per million
Appearance Clear and bright
Odour Normal
Reaction pH 7.4
Total dissolved Solids 420 parts per million
Chlorine as CI 41 „ „ „
Ammoniacal Nitrogen 0.26 „ „ „
Albuminoid Nitrogen 016 „ „ „
Nitrate Nitrogen Absent
Nitrite Nitrogen Absent
Permanganate Value 0.16 parts per million
Total Hardness as CaC03 212 „ „ „
Total Alkalinity as CaC03 115 „ „ „
Non-Carbonate Hardness 97 „ „ „
"The chemical results on this sample are satisfactory and in this
respect the supply it represents is suitable for domestic purposes."
There are no houses in the Borough supplied with water by a stand
pipe, all the dwellings in the district having a supply direct from the
Company's main.
No evidence exists that the water is plumbo-solvent and before
distribution the new water is chlorinated and partially dechlorinated. The
flouride content of the water supplied is consistently less than 01 p.p.m.(F).