Groundwater is the main freshwater source in semi-arid areas, thus, needs protection from human pollution. The municipal solid waste landfill and an untreated wastewater disposal facility are located in Al-Lajjoun region of central Jordan which situated within the recharge zone of the Amman-Wadi Sir (A7/B2) carbonate aquifer, this study investigates the sustainability and the groundwater quality. for that reason, untreated wastewater and soil samples impacted by leachate, and eight production wells were observed in the summer and winter. Major ions, trace metals, and physicochemical properties were examined and compared with Jordanian drinking water standards. The results show that the groundwater hydrochemistry is mainly consistent during the year, where the majority of parameters falling within permitted limits. Nevertheless, chromium concentration in all wells continuously exceed drinking water regulation, indicating a recurring pollution problem. Meanwhile, the landfill leachate saturated soils demonstrated high concentrations of Fe, Cr, Cd, Pb, Ni, Zn, and Mn compared with baseline values. Untreated wastewater had high organic and nutrient concentrations. The high metal concentrations in leachate affected soils lead to a possible permanent risk to the aquifer sustainability even in the absence of direct hydraulic mixing between wastewater and groundwater, particularly, in structurally fractured carbonate systems. The findings demonstrate the aquifer's resilience under current conditions, Also, shows the necessity for long-term hydrochemical monitoring, engineered barrier structures, and preventive management to ensure groundwater conservation in arid zones.