Hints from the Health Department. Leaflet from the archive of the Society of Medical Officers of Health. Credit: Wellcome Collection, London
[Report of the Medical Officer of Health for Harrow]
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109
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, twenty-two samples were taken by the Department—all were
satisfactory.
Four samples were also taken of water from the deep boring at
Messrs. Braziers, Kenton Lane, where the supply from this source is used
for cooling and for other purposes within the dairy. Again, the results in
each case were satisfactory.
The following is a copy of the report received on a sample submitted
for chemical analysis during December 1969:—
Suspended Matter | Absent |
Appearance | Clear and Bright |
Colour | Less than 5 Hazen Units |
Taste | Normal |
Odour | Absent |
Total Solid Residue dried at 105°C | 322. |
Chlorides as Chlorion | 37 |
Nitrate Nitrogen | 12 |
Nitrite Nitrogen | Absent |
Ammoniacal Nitrogen | 0.10 |
Albuminoid Nitrogen | 0.03 |
Oxygen Absorbed, 4 hrs. at 27°C | 0.12 |
Total Hardness as CaC03 | 170 |
Non-carbonate hardness as CaC03 | 77 |
Alkalinity as CaC03 | 93 |
Poisonous Metals | Absent |
pH | 7.5 |