Publications Search - Publication Abstract, Illinois State Water Survey

Publication Abstract

Coliforms and Fecal Streptococcus in the Illinois River at Peoria, 1971 - 1976 Lin, Shun Dar, and Ralph L. Evans, 1980  Illinois State Water Survey, Champaign, IL,  ISWS RI-93    Full Text Available

Water samples from the Illinois River at Peoria were collected weekly and examined for total coliform (TC), fecal coliform (FC), fecal streptococcus (FS), and 17 chemical and physical parameters. The bacteria data obtained during June 1971 to May 1976 were compiled and evaluated monthly, seasonally, and yearly. Wide ranges of bacterial densities were observed. The densities of TC and FC were high during the winter and summer, respectively. The FS counts fluctuated less with time. About 44 percent of the time FC densities complied with the Illinois Pollution Control Board rule regarding 200 per ml. Compliance with the rule regarding 400 FC per 100 ml was found to be the limiting factor. Approximately 7.1 percent of the TC densities consisted of FC. The FC/TC values were low in the winter and spring months and high in the summer and fall. Based on FC/FS ratio values, fecal contamination derived from human sources occurred in 41 percent of the samples collected during June through August. An attempt to correlate the bacterial densities with the 17 parameters measured was not successful. A time series analysis was performed to show the trends, seasonal and cyclical indexes, and irregular factors for the bacterial densities.

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