In freshwater, the EPA limits on mean concentrations are 33 CFU per 100 milliliters for Enterococcus and 126 CFU per 100 milliliters for E. coli.

• 如果是淡水的话，肠球菌的平均浓度应低于每100毫升33个CFU，大肠杆菌则须低于每100毫升126个CFU。