Abstract : Organic micro-‐pollutants, pesticides and PAHs, are on the priority list of the Water Framework Directive (WFD) for groundwater protection. If there is no major quantitative challenge for groundwater of the Roumois and Plateau of Neubourg, a deterioration of their quality is however observed. Indeed, the resource is extremely sensitive to diffuse contaminations caused by some fast connections between surfaces and underground and originating in agriculture & industrial activities and road traffic,. . Thus, it is necessary to study the fate of these molecules in these catchments. The transfer of micro-‐pollutants was studied both by monitoring the evolution of the chemical quality of water (major elements, PAHs and pesticides) and by characterizing the adsorption capacity of surficial materials. The results show a spatial variability between the two watersheds and temporal variability between seasons. The influence of meteorological and hydrogeological parameters has been demonstrated both in the total concentrations of pollutants and in the relative contribution of each of the compounds studied. Once being deposited on soils, these molecules are first transferred to the unsaturated zone of soil in the saturated zone and can reach the water reservoir for domestic purposes by lateral flows through karst conduits.. This study highlighted the importance of the storage of pollutants in the agricultural soils of the Roumois whose mobilizable fraction can represent up to80% o f the stock in the soil. Our results assist in establishing a conceptual transfer of pollutants by monitoring some target molecules, as fluoranthene (PAH) and Diflufenican (pesticide), within the continuum soil -‐ water gravity -‐ hydraulic downstream.