Relationships among pollution indicator bacteria isolated from raw water and distribution systems by the presence-absence (P-A) test
Clark, J.A.; Vlassoff, L.T.
Health Laboratory Science 10(3): 163-172
1973
ISSN/ISBN: 0017-9035 PMID: 4352690 Document Number: 2916
Comparative analyses of raw and drinking water samples were made using membrane filter (MF) and presence-absence (P-A) procedures. Analysis of raw water samples was more suited to MF procedures, whereas analysis of drinking water samples was more effectively performed by the P-A procedure. Pollution levels in the samples influenced the types, frequencies and combinations of pollution indicator bacteria detected by the P-A test. Bacteria indicative of fecal pollution were the first to disappear following water treatment, although coliform bacteria were the principal organisms isolated from insufficiently treated water. Water considered potable from a sanitary aspect may still have an appreciable incidence of other bacteria present such as fluorescent pseudomonads.
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