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. Author manuscript; available in PMC: 2020 Jul 17.
Published in final edited form as: Water Res. 2018 Apr 25;140:200–210. doi: 10.1016/j.watres.2018.04.055

Table 3:

Summary of sampling sites subject to E. coli advisory under the U.S. EPA Recreational Water Quality Criteria Beach Action Value (235 MPN/100mL) and comparison of respective somatic coliphage and enterococci concentrations.

Site n >235 MPN % Advisories Somatic (PFU) p-value Total Coliphage (PFU) p-value Enterococci (CFU) p-value
Edgewater (ED) Composite 66 24 36.4 0.1034 0.1027 0.0002
Historic 66 11 16.7 0.0084 0.0105 <.0001
River 67 35 52.2 < 0.0001 < 0.0001 <.0001
Grant Park (GP) Composite 71 12 16.9 0.0129 0.0114 <.0001
Historic 70 9 12.9 0.0135 0.0158 < 0.0001
River 70 65 92.9 0.1109 0.1100 0.0140
Washington Park (WP) Composite 64 6 9.4 0.0070 0.0062 0.0041
Historic 64 10 15.6 0.0965 0.4212 0.0259
River 63 58 92.1 0.0309 0.0277 0.0030

‘n’ refers to total number of samples. ‘> 235 MPN’ indicates number of samples with E. coli concentrations greater than the U.S. EPA Recreational Water Quality Criteria Beach Action Value (235 MPN/100mL). Bolded p-values indicate no significant difference (p > 0.05) between respective mean indicator concentrations.