Environmental conditions influence fecal indicator bacteria (FIB) levels, which are routinely used to characterize recreational water quality. This study examined 15 years of environmental and FIB data at Puntarenas and Jacó beach, Costa Rica. FIB relationships with sea level, wave height, precipitation, direct normal irradiance (DNI), wind, and turbidity were analyzed. Pearson's correlations identified lags between 24 and 96 h among environmental parameters and FIB. Multiple linear regression models composed of environmental parameters explained 24% and 27% of fecal coliforms and enterococci variability in Jacó, respectively. Puntarenas’s models explained 17–26% of fecal coliforms and 12–18% enterococci variability. Precipitation, sea level anomalies, and wave height most frequently explained FIB variability. Hypothesis testing often identified significant differences in precipitation, wave height, daily sea level anomalies, and maximum sea level 24 h prior between days with and without FIB threshold exceedance. Unexpected FIB interactions with DNI, sea level, and turbidity highlight the importance of future investigations.

环境条件影响粪便指示剂细菌（FIB）的水平，通常将其用于表征娱乐用水的质量。这项研究检查了哥斯达黎加的Puntarenas和Jacó海滩15年的环境和FIB数据。分析了FIB与海平面，波高，降水，直接法向辐照度（DNI），风和浊度的关系。皮尔森的相关性确定了环境参数和FIB之间的24到96小时之间的滞后。由环境参数组成的多个线性回归模型分别解释了雅科大肠菌群和肠球菌变异性分别为24％和27％。蓬塔雷纳斯（Puntarenas）的模型解释了粪大肠菌群的17–26％和肠球菌变异性的12–18％。降水，海平面异常和波高最常解释FIB的可变性。假设测试通常会在有和没有超过FIB阈值的日子之间的24小时之前，在降水量，波高，每日海平面异常和最大海平面之间发现显着差异。FIB与DNI，海平面和浊度的意外相互作用凸显了未来调查的重要性。