Local authorities claim that 50% of the coastal areas in Mactan have E.Coli contamination that exceeds 100 MPN (most probable number of bacteria) per 100 milliliters. Regional authorities examined all 200 coastal areas and found out that 124 of the 200 coastal areas has E.Coli contamination of more than 100 MPN per 100 ml. The regional authorities believe that the contaminated coastal areas is more than 50%. Use significance level of 0.05