Three hundred and thirty-nine water samples obtained from 90 locations in Korea from 2007 to 2011
were tested for the presence of enteric viruses (EV), total coliforms (TC), and fecal coliforms (FC). A total
culturable virus assay revealed that 89 samples (26.3%) were positive for EVs, the average concentration
being 5.8 most probable number (MPN)/100 L. The Han river basin exhibited the highest contamination
by EVs (occurrence, 41.3%; average concentration, 24.0 MPN/100 L). EV contamination was found
more frequently in river water (occurrence, 33.6%; concentration, 8.4 MPN/100 L) than in lake water or
groundwater. The concentration of EVs was highest in spring (7.7 MPN/100 L), whereas it was found
most frequently in winter (36.1%). The number of TCs ranged from 0 ? 1.2 × 10^5 colony forming units
(CFU)/100 mL and that of FCs from0?6.2×10^3 CFU/100mL per sample. Statistical analyses showed that
the presence of EVs,TCs and FCs did not correlate significantly with temperatureor turbidity. In addition,
presence of TCs and FCs was not significantly correlated with presence of EVs. In conclusion, TCs and
FCs may not be accurate microbial indicators of waterborne EVs in Korean aquatic environments.