The rivers that flow into the Gulf of Montijo in Veraguas (Panama) have a significant impact on this ecosystem. These rivers include the Playita and Pavo rivers in southern Mariato. Physicochemical and microbiological tests were conducted at their mouths. Microbiological tests used enterococci as indicators of fecal contamination. The objective of this study was to measure some of these factors, particularly the degree of fecal contamination in these rivers. Field trips were conducted during the rainy season of 2021 and the dry season of 2022. Surface water samples were taken, a total of five in each season. The samples were analyzed in the field for physicochemical factors (pH, temperature, conductivity, and total dissolved solids), and other samples in sterile containers at 7°C were taken to the microbiology laboratory of the Veraguas Regional University Center. These samples were analyzed for Enterococcus spp. using the Enterolert-DW system. Statistical tests were applied to the data using SPSS software. No significant differences were observed across sampling sites, but differences were observed when separated by season. Total dissolved solids, conductivity, and temperature were highest during the dry season. The pH was higher during the rainy season. Enterococcus counts remained the same across sampling sites and seasons and did not exceed the risk limits established for recreational activities in these rivers. These results are useful for monitoring pollution in these rivers as they flow toward the mouth of the Gulf of Montijo, which is important for the authorities' actions in managing the area.
