London's Pulse: Medical Officer of Health reports 1848-1972

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Hints from the Health Department. Leaflet from the archive of the Society of Medical Officers of Health. Credit: Wellcome Collection, London

Harrow 1973

[Report of the Medical Officer of Health for Harrow]

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93
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 was satisfactory in quantity and quality and no adverse
reports were received.
In addition to samples taken by the Colne Valley Water Company,
twenty-four samples were taken by the Department—all were satisfactory,
likewise five samples taken from the deep boring of Messrs. Braziers,
Kenton Lane. The supply in this case is used for cooling and other
purposes within the dairy.

Table: The following is a copy of a report received on a sample submitted for chemical analysis :-PHYSICAL EXAMINATION

The following is a copy of a report received on a sample submitted for chemical analysis :-

PHYSICAL EXAMINATION

Suspended matterAbsent
AppearanceClear and Bright
ColourLess than 5 Hazen Units
TasteNormal
OdourNormal

Table: CHEMICAL EXAMINATION

CHEMICAL EXAMINATION

DeterminationsResults in Parts per Million
Total Solid Residue dried at 105°C446
Chlorides as Chlorion48
Nitrate Nitrogen—
Nitrite Nitrogen—
Ammoniacal Nitrogen0.024
Albuminoid Nitrogen0.054
Oxygen absorbed, 4 hrs. at 27°C0.08
Total Hardness as CaC03288
Non-carbonate hardness as CaC03—
Alkalinity as CaC03207
Poisonous Metals—
pH7.8

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This is a satisfactory water showing no signs of contamination and,
in my opinion, is chemically suitable for domestic purposes.