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

Yiewsley and West Drayton 1961

[Report of the Medical Officer of Health for Yiewsley]

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Table: BACTERIOLOGICAL EXAMINATION

BACTERIOLOGICAL EXAMINATION

Location Type Residua1 Chlorine p.p.m.Colonies per ml 2 daysColonies per ml 3 daysBact. coli (Type1) Probable number per 100 mlPresumptive Coliacrogencs Probable number per 100 ml
West Drayton P.S. Treated water .150200
Remarks : This water conforms to the highest standard of bacterial purity.

Table: CHEMICAL EXAMINATION

CHEMICAL EXAMINATION

Location .West Drayton Pumping StationRaw or TreatedTreated
ColourNil HazenChloride (CI)19 p.p.m.
Turbidity (Si02)Nil p.p.m.Alkalinity (CaCO3)235 p.p.m.
OdourNilHardness (CaC03) Carbonate305 p.p.m.
T asteNormalNon-CarbonateNil p.p.m.
Ph7.3Total205 p.p.m.
Electrical Conductivity (20° C)480Residual Chlorine (Cl2).12 p.p.m.
Total Solids (180oc)315 p p.m.Copper.02 p.p.m.
Nitrate (N)Nil p.p.m.Iron.02 p.p.m.
Nitrite (N).039 p.p.m.ZincNil p.p.m.
Ammonia (N).168 p.p.m.
Albuminoid Nitrogen (N)Nil p.p.m.
Remarks . This water is moderately hard in character and contains no excess of mineral or saline constituents. It conforms to the highest standard of organic quality.