Plastic waste can be seen in several areas in the Wonorejo mangrove forest, Surabaya, which is also a habitat for various types of microbes. Research on bacterial isolates from water samples in mangrove forests needs to be conducted to determine their diversity. This research was conducted to determine the diversity and dominance of bacterial isolates in mangrove forest waters. Each water sample was taken from a site that is regularly irrigated (station 1) and a site that is flooded (station

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... The number of bacteria in mangrove forest water samples was determined using the Total Plate Count (TPC) method and bacterial isolation was performed using the pour plate method. Subsequently, the bacterial isolates were characterized based on their colonies and observed for their dominance. The number of bacteria at station 1 was 4.85x102CFU/mL and 2.55x105 CFU/mL at station 2. Both stations showed bacterial diversity. However, several bacterial isolates with the same character can be found in both stations. Further research should be conducted to determine the potential of these bacterial isolates as plastic-degrading agents.