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. Author manuscript; available in PMC: 2022 Mar 15.
Published in final edited form as: Water Res. 2021 Jan 17;192:116845. doi: 10.1016/j.watres.2021.116845

Table 2.

Bacterial and viral fecal indicator threshold definitions, sample counts, and frequencies for beach and river site type groupings.

General Fecal, Indicator Group Threshold Beach Type River Type
Above Below Above Below
Somatic Coliphage 60 PFU/100mL 15 (8.8%) 156 (91.2%) 142 (83%) 29 (17%)
F+ Coliphage 30 PFU/100mL 0 (0%) 171 (100%) 13 (7.6%) 158 (92.4%)
E. coli 190 MPN/100mL 42 (24.6%) 129 (75.4%) 137 (80.1%) 34 (19.9%)
Enterococci 60 CFU/100mL 77 (45%) 94 (55%) 142 (83%) 29 (17%)

() shows percent of total samples in a given site type (n = 171 total samples per water type).

PFU denotes plaque forming unit.

MPN indicates multiple probable number.

CFU represents culture forming unit.