The progressive decrease of water resource is leading toward the unavoidable use of other water resources like marginal water for irrigation. Irrigation with wastewater raises salinity, contaminant accumulation, sanitary problems, and problems of organic nature, due to toxic substances. Reuse criteria can be relaxed somewhat when using drip irrigation and subsurface drip irrigation, because the soil acts as a complementary biofilter. The main objective of this project is to investigate the chemical and biological contaminant transport and their fate in soil which treated with marginal water. This project includes building physical models to characterize the transportation of contaminant in soil.