Using microbial indicators is the most practical method in monitoring water quality. In this study, the correlation among the above-mentioned microbial indicators were investigated for the coastal waters of the Caspian Sea in the eastern part of the northern Iranian province of Mazandaran. Microbial analysis were conducted using the membrane filter (MF) procedures outlined in Standard Methods 9222D and EPA method 1600. The normality test of Skewness and Shapiro-Wilk Test, the Kruskal-Wallis test, and the Pearson correlation coefficient (PCC) were used for sample distribution, sampling stations and sampling time comparisons, and determining the relationship between the microbial indicators and the environmental parameters, respectively. Significant differences were observed among the sampling stations, with the highest pollution going to the Jafarabad and Daraee beaches. In addition, the observed percentages of pollution by enterococci and fecal coliforms were 25.55% and 22.59%, respectively; and the weight obtained for the former and the latter were 0.3806 and 0.3762, respectively, indicating very close results and the importance of enterococci. The weights obtained for the sampling stations show the higher importance of enterococci and fecal coliforms at eastern and western swimming stations, respectively.