Abstract

This study assessed the impact of inland pollution sources on the sanitary status of seawater and shellfish (Abalone) in the Bogil-Nohwa Area after rainfall events of 16.0 and 55.7 mm rainfall events. We analyzed sanitary indicator microorganisms including coliform group, fecal coliform and Escherichia coli (E. coli) in the discharge water from major inland pollution sources, seawater and shellfish for 4 days after rainfall events. After the 16.0 mm rainfall, coliform group and fecal coliform concentrations in the discharge water from 5 domestic wastewater sources increased, reaching a range from 49,000 to 230,000,000 MPN/100 ml and from 4,600 to 130,000,000 MPN/100 ml, respectively. The radius of the impacted area ranged from 173.6 to 2,208.7 m. After the 55.7 mm rainfall, coliform group and fecal coliform concentrations ranged from 11,000 to 24,000,000 MPN/100 ml and from 78 to 3,300,000 MPN/100 ml, with the radius of the impacted area ranging from 97.8 to 1,079.8 m. The fecal coliform levels in seawaters at 33 stations ranged from < 1.8 to 79 MPN/100 ml and the E. coli levels in shellfish at 4 stations ranged from < 18 to 130 MPN/100 g. Salmonella spp. was not detected in any shellfish samples.