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 1972
[Report of the Medical Officer of Health for Harrow]
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68
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, 29 samples were taken by the Department—all were satisfactory.
Five 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.
PHYSICAL EXAMINATION
Suspended Matter Absent
Appearance Clear and Bright
Colour Less than 5 Hazen Units
Taste Normal
Odour Little
CHEMICAL EXAMINATION
| Determinations | Results in Parts per million |
|---|---|
| Total Solid Residue dried at 105°C | 378 |
| Chlorides as Chlorion | 45 |
| Nitrate Nitrogen | N.D. |
| Nitrite Nitrogen | N.D. |
| Ammoniacal Nitrogen | 0.04 |
| Albuminoid Nitrogen | 0.01 |
| Oxygen absorbed, 4 hrs. at 27°C | 0.28 |
| Total Hardness as CaC03 | 246 |
| Non-carbonate hardness as CaC03 | 73 |
| Alkalinity as CaC03 | 173 |
| Poisonous Metals | N.D. |
| pH | 7.3 |
BACTERIOLOGICAL EXAMINATION
Plate cultivation, Number of Colonies per ml. —
Presumptive Coliform Count on 100 ml. —
The chemical results on this sample are satisfactory and in this
respect the supply it represents is suitable for domestic purposes.
DRAINAGE AND SEWAGE DISPOSAL
The soil sewage from the Borough flows to the West Middlesex
Drainage Works at Mogden as it has done since 1936, when the last of
the five disposal works in the area went out of use.