One of the bioreactor concepts is based on waste moisture optimisation to increase biogas production and accelerate biodegradation to reduce post closure operation and possible impact on the environment. Measuring moisture content of landfilled waste is a difficult task due to the complexity of sensor implementation during landfilling of waste and the weak representativeness of punctual data. Among all the techniques available (Imhoff et al., 2006), electrical resistivity tomography proves since many years its potential (Moreau et al. 2007; Rosqvist et al., 2006). Its ability to evaluate the performance of leachate recirculation network is demonstrated by showing the zones subjected to electrical resistivity variations. Nevertheless, electrical resistivity is influenced by several physical parameters and no relationship with volumetric water content was yet established for Municipal Solid Waste (MSW).