The present study was undertaken to determine the microbiological (total coliforms, fecal coliforms, fecal streptococci and Salmonella sp.) and physico-chemical parameters (pH, conductivity, nitrate and phosphate) with trace metal concentration (arsenic, chromium) and cyanide of 74 coastal bathing water samples obtained from Dardanelles (Site 1) and Thracian Sea (Site 2). About 5 of 74 (6.75%) water samples were of unacceptable quality based on recommended criteria of microbiological (3 of 74, 4.05%) and physico-chemical with trace metal concentration (2 of 74, 2.70%) by Turkish Bathing Water, Turkish Water Pollution and European Community Bathing Water Directives. The results indicated that the value of total coliforms and fecal coliforms provided an adequate indicator of Salmonella sp. presence. Among the trace metals, only arsenic was detected at the below acceptable limits. Therefore, it is necessary cleaning of waste waters by purification plants, infiltration of effluent from sewage treatment plants, control industrial factors and maintaining water quality controls.