Bacteriological data from 1980 to 1991 were reviewed to determine whether coliform bacteria occurred seasonally and spatially within a midwestern city's distribution system. Coliform bacteria are used as microbiological indicator organisms to determine if a public water supply is safe for consumption. The public water_ distribution system examined had at least a twelve year history of the presence of coliform bacteria. Previous investigations have described the occurrence of the coliform bacteria as sporadic because there were no apparent patterns to their presence. An analysis of bacteriological data has not previously been performed to specifically detect seasonal and spatial occurrences of coliform bacteria.This study attempted to determine if seasonal or spatial patterns of coliform occurrences exist within the in the dominant coliform species. Data indicate that the highest percentage of coliform positive samples occurred in the summer, followed by fall, then winter, with spring having the lowest percentage of coliform positive samples. While Enterobacter cloacae was the dominant coliform species during the spring, summer and fall, Klebsiella oxytoca was the dominant coliform during the winter. Coliform occurrence throughout the distribution system was variable among the 43 sample sites. The percentage of positive samples from the various sites ranged from 0% to 10.5%. The five sites with the highest percentage of coliform positive samples were at the extremities of the distribution system. E. cloacae was dominant at 88% of the sites. K. oxytoca was dominant at 9% sites, which typically had a low percentage of coliform positive samples. / Department of Biology

Thesis (M.A.)--Texas State University-San Marcos, 2007. / Vita. Appendices: leaves 52-78. Includes bibliographical references (leaves 79-83).

Thesis (M.A.)--Texas State University-San Marcos, 2007. / Vita. Appendices: leaves 52-78. Includes bibliographical references (leaves 79-83).

Thesis (M.Sc.)--University of Wollongong, 2006. / Typescript. Includes bibliographical references: leaf 178-186.

Thesis (M.S.)--Eastern Illinois University, 2009. / Includes bibliographical references (leaves 23-26).

Thesis (Ph. D.)--West Virginia University, 2008. / Title from document title page. Document formatted into pages; contains xiv, 258 p. : ill., maps. Includes abstract. Includes bibliographical references.

Thesis (M. Sc.)--University of Hong Kong, 1996. / Includes bibliographical references (leaf 42-47).

Thesis (M. Sc.)--University of Hong Kong, 1996. / Includes bibliographical references (leaf [64-67]).

Thesis (M.Sc. Biological Sciences)--University of Waikato, 2009. / Title from PDF cover (viewed October 2, 2009) Includes bibliographical references (p. 59-74)

Thesis (M.Sc.) - Carleton University, 2007. / Includes bibliographical references (p. 67-73). Also available in electronic format on the Internet.