[Report 1950] / School Medical Officer of Health, Exeter.
- Exeter (England). City Council.
- Date:
- 1950
Licence: Attribution 4.0 International (CC BY 4.0)
Credit: [Report 1950] / School Medical Officer of Health, Exeter. Source: Wellcome Collection.
27/94 (page 23)
![neutral, neither acid or alkaline and is, therefore, not likely to be plumbo-solvent. The quality of the supply from new mains is also carefully checked before it is put into distribution. All examinations of the treated water proved satisfactory. In co-operation with the City Engineer and with the help of the Public Health Laboratory Service, a more extensive system of bacteriological control has been put into operation from the beginning of 1951. This programme will provide for the testing of two samples per week from the distribution system, so arranged that the supply from each of the four service reservoirs is tested in rotation every two weeks. In addition, the City Engineer’s staff will carry out more frequent chemical and bacteriological examinations of the raw and treated water, including tests for plumbo-solvency. It is intended to submit quarterly samples, as at' present, for independent check by the Public Analyst. A detailed analysis of the raw water is set out below :— Sample of raw water from Intake on River Exe, 11th October, 1950. Characters. Colour Turbidity Taste Odour Suspended matters yellow green tint. clear. natural. none. traces of detritus of vegeta- tion, diatoms and infusorians. Bacteria. Bacillus coli 50 per 100 millilitres. Streptococcus 9 > Colonies visible at the end of 72 hours on beef-peptone- agar at 37 deg. C. 760 per millilitre. Colonies visible at the end of] 48 hours on beef-peptone- ^ ^5 Per naillilitre. agar at 37 deg. C. J](https://iiif.wellcomecollection.org/image/b29199281_0029.jp2/full/800%2C/0/default.jpg)
