Concentrations of 'Escherichia coli' in Streams in the Kankakee and Lower Wabash River Watersheds in Indiana, June-September 1999.

摘要

Water samples collected from 58 surface-water sites in the Kankakee and Lower Wabash River Watersheds from June through September 1999 were analyzed for concentrations of Escherichia coli bacteria. Each site was sampled five times in a 30-day period. Twenty-nine sites were sampled during June and July, and 29 different sites were sampled during August and September. A five-sample geometric mean of concentrations was computed for each site. Concentrations of Escherichia coli (E. coli) in 126 of the 289 sampled exceeded the State of Indiana single-sample standard of 235 colonies per 100 milliliters for waters used for recreation. Concentrations in samples from 38 of the 58 sites exceeded the State of Indiana standard for a five-sample geometric mean of 125 colonies per 100 milliliters for waters used for recreation.