One of the key points of bioreactor landfill is to control the hydraulic repartition of leachate in waste mass to ensure an optimal degradation. Specific conditions linked to Municipal Solid Waste (MSW) landfill exist such as: important waste cells volume, waste heterogeneity, landfilling constraints, leachate and biogas distribution and justify exploring non intrusive method with a resolution larger than waste heterogeneity. Geophysics methods appeared as an interesting tool and especially the electric tomography of resistivity to highlight the moisture variations in waste mass.