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Publication Abstract

Indicator Bacterial Quality in the Illinois River at Peoria, Illinois, 1976-1986 Lin, Shundar, and Davis B. Beuscher, 1994  Illinois State Water Survey, Champaign, IL,  ISWS RR-126    Full Text Available
This report covers the results of weekly monitoring for total coliform (TC), fecal coliform (FC), and fecal streptococcus (FS) densities in water from the Illinois River at Peoria. The study compiled long-term indicator bacteria densities for comparison with the FC standards and evaluated the FC/TC and FC/FS ratios. Data gathered were investigated for monthly, seasonal, yearly, and five-year period trends. Observations showed considerably wide ranges of bacterial counts, and bacterial densities were generally higher in the summer months and lower in winter months. This study indicates that bacterial quality (not TC) has deteriorated in the Illinois River at Peoria since 1980. On the basis of FC/FS values, major fecal contamination was derived from human sources during the summer and fall, whereas it was derived from nonhuman sources during the winter and spring.

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