[Report 1965] / School Medical Officer of Health, Exeter.

  • Exeter (England). City Council.
Date:
1965
Catalogue details

Licence: Attribution 4.0 International (CC BY 4.0)

Credit: [Report 1965] / School Medical Officer of Health, Exeter. Source: Wellcome Collection.

    34/152 (page 30)
    EXETER PUBLIC WATER SUPPLY Bacteriological Analyses of Samples Taken in 1965. (Examined by Public Health Laboratory.) Presumptive B. Coli count No. of per 100 millilitres Water after Treatment Samples 0 1-2 3-10 11-50 50+ (A) At Treatment Works : Pumping Main 245 244 — I — — (B) On Consumers’ Supply : Danes Castle Reservoir Zone 39 25 10 3 1 — Belvidere Reservoir Zone 23 22 1 — — — Marypole Head Reservoir Zone 16 12 2 2 — — Barley Lane Reservoir Zone 18 17 — i — — Stoke Hill Reservoir Zone 13 12 i — — — Total 354 332 14 7 1 — Others: Building Sites, New Mains, etc. 63 38 7 4 12 2 In addition 49 samples of Raw River Water were examined—generally these shewed gross pollution (25 to 18,000 presumptive B. Coli per 100 ml.) ; and also 10 samples of water whilst undergoing treatment for the purposes of checking the efficiency of the sterilisation process at various stages. The Chief Engineer to the East Devon Water Board (Mr. E. C. Gordon, a.m.i.c.e., a.m.i.w.e.) has kindly given me the following notes : The City derives its water supply from the River Exe, the East Devon Water Board being responsible for its collection, treatment and distribution. The water has been satisfactory in quality and quantity during the }'ear. Generally speaking, the pH of water from the Pynes plant has been main- tained at about 8.7. The classified results of bacteriological examinations of raw and treated water, and examples of the chemical analysis, are set out above. The treated water is not plumbo-solvent. When samples are found to be unsatisfactory repeat samples are taken, and appropriate action taken at the works. No serious instances of pollution occurred. Arrange- ments are in hand to swab out sections of the mains to clear deposits. Approximately 24,600 dwelling-houses at 1st April 1965 were supplied. None was supplied by standpipes. 3o