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105
ENVIRONMENTAL HEALTH SERVICE
WATER SUPPLY
Apart from a small area in the extreme south-west 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, ten samples were taken by the Department for bacteriological
examination and the following is a copy of the report received on a sample
submitted for chemical analysis:—
Chemicals Result in parts per million
Suspended Matter absent
Appearance clear and bright
Taste normal
Colour less than 5 hazen units
Odour absent
Total Solid Residue dried at 105°C 468 parts per million
Chlorides as Chlorion 65 „ „ „
Nitrate Nitrogen absent
Nitrite Nitrogen absent
Ammoniacal Nitrogen 0-10 „ „ „
Albuminiod Nitrogen 0-03 „ „ „
Oxygen absorbed, 4 hrs. at 27°C. 0-50 „ „ „
Total Hardness as CaCO3 372 „ „ „
Non-Carbonate Hardness as CaC03 128 „ „ „
Alkalinity as CaCO3 244 „ „
Poisonous Metals absent
Reaction pH 7.3
"This is a hard water with a low solids in solution. It is chemically
suitable for a domestic supply".
There are no houses in the district supplied with water by a standpipe,
all the dwellings in the district having a supply direct from the mains
of the Water Company.
No evidence exists that the water is plumbo-solvent and before
distribution the new water is chlorinated and partially dechlorinated. The
fluoride content of the water supplied is consistently less than 0.1 p.p.m.