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Rainwater samples are derived from three precipitation collectors installed at different altitudes (monitoring period 2010-2019; n = 57). Surface water samples were collected at three sampling sites located along the Del Azul Creek and six wetlands (monitoring period 2018-2019; n = 12). Groundwater samples were collected from 17 piezometers with depths ranging between 3 and 10 m, and from 12 piezometers of 30 m depth, all located throughout the entire basin (monitoring period 2018-2019; n = 115). Sampling campaigns were performed during the