E. Coli

Escherichia coli (commonly E. coli) is a bacteria that is commonly found in the lower intestine of warm-blooded animals.
Importance: is a bacterium that though not pathogenic itself, is an indicator for the presence of human feces and thus potential for the presence of pathogens.
Sources: leaky septic systems, combined sewer overflows
Values: To be safe for swimming there should be no more than 250 colonies/ 100 ml.

THE HEALTHIEST RIVER ACCORDING THE PRESENCE OF COLIFORMS IS :

                                                OHIO RIVER.

Chicago River

Total number of non fecal coliform colonies= 66 +/- 25 (0-104)
Total number of fecal coliform colonies= 5 +/- 3 (0-11)
Total number of colonies = 83 +/- 29 (12-130)
% contamination = 5.65 +/- 3.02% (0-12.64%)


Clear Creek/ (Chamber Creek)

(Clear Creek)
Mean of the E.Coli= 10.8
Standard: 5.37
Ranges: 2-22

(Chamber Creek)
Mean of the E.Coli= 7.7
Standard: 6
Ranges: 2-30


Ohio River

Not present. None of the coliforms or bacteria are present in the river.