[Report 1946] / Medical Officer of Health, Oswestry Borough.

  • Oswestry (England). Borough Council.
Date:
1946
Catalogue details

Licence: Attribution 4.0 International (CC BY 4.0)

Credit: [Report 1946] / Medical Officer of Health, Oswestry Borough. Source: Wellcome Collection.

    37/82 (page 17)
    17. is not marked. The water is practically neutral in reaction hut it is soft in character and has a low content of alkalinity. ' It contains comparatively little mineral constituents in solution and is free from metals apart from a minute trace of iron. The water has very distinct colour and is of a low grade of organic quality. It shows slight bacterial impurity indicative of contamination by matter of excremental origin since Bact. Coli are present in appreciable number. Treatment is therefore required to render the water suitable for public supply purposes. Sample A/RY/42. Filtered water. 1 day No. of colonies developing at 37°0 on Agar per cc. or ml. in 13 Presumptive Coliform Reaction * present in 20 cc. Absent from 10 cc. Bact. Ooli Present in - Absent from 100 cc. 01. tfelchii Reaction Present in lOOcc. Absent from 10 cc. *Due to Coliform Bacteria of Intermediate Type II and Aerogenes Type I. This sample is practically clear and bright in appearance and free from metals apart from a negligible trace of iron. The water is almost neutral in reaction but it is soft in character and has a low content of alkalinity; a corrosive tendancy towards metals would be anticipated. It has comparatively small amount of mineral constituents in solution. Compared with the raw supply the water shows only a sma.ll reduction dm organic content and it retains distinct colour. It is not of a high standard of bacterial purity since coliform organisms are present and, although, in the aosence of bacteria of excremental type, the water may not oe unwholesome, it is not of the high standard required in a public supply. 2 days, at 37°C 28. 3 days, at 20°0 70