In this study, we evaluated the effect of inland pollution sources on seawater and shellfish (Oyster and Scallop) in Goseong bay after rainfall events. We analyzed the sanitary indicator microorganism such as total coliform, fecal coliform and Escherichia coli (E. coli) in the discharge water of major inland pollutants, seawater and shellfish for 3 days after 25.5, 56.0 and 101.5 mm rainfall events. According to these results, the range of total coliform and fecal coliform was < 1.8-2,400 and < 1.8-2,400 after 25.5 mm rainfall and was from < 1.8 to 110 and from < 1.8 to 13 MPN/100 mL after 56.0 mm rainfall and was from 79 to 11,000 and from 79 to 11,000 MPN/100 mL after 101.5 mm rainfall in the discharge water of 2 waste water treatment plants. Also the range of fecal coliform and radius of impacted area of 9 contaminants (stream) was from 13 to 35,000 MPN/100 mL and from 14 to 2,249 m, respectively. The fecal coliform of seawater at 34 stations ranged from < 1.8 to 540 MPN/100 mL, respectively. And The E. coli level of shellfish (Oyster and Scallop) at 6 station ranged from < 18 to 5,400 MPN/100 g.