Environmental impacts of nitrogenous fertilizers, pesticides and salts contained in irrigation are becoming an increasing concern, because they may move with soil water from root zone to groundwater. The aim of this research was to identify the irrigation management and the rainfall depth influence over nitrate and chloride concentration in the soil profiles, as well as the risk of water table pollution in the Irrigated District of Baixo Acaraú (DIBAU), Ceará, Brazil. Soil samples were taken each 50cm deep soil profiles until to saturated zone (7m) in two different types of land use: irrigated area (S1) and native area (S2). Samples occurred during irrigation activities (Nov/06) and rainfall season (May/07). The water table was measured, monthly, from Dec/2003 to Nov/2005, Nov/2006, Mar and April/2007 in four shallow wells, two located in irrigated fields and the others in native. The greatest chloride concentration in the soil profiles was registered during rainfall season, suggesting the effect of sea-salt aerosols influence on chloride soil content. The greatest nitrate concentration occurred under irrigation period. Also, the results show that irrigation caused the groundwater concentration of NO3-N to increase from 1.52 to 19.3mgL-1, thereby, exceeding the standards on Regulation MS number 518/2004 and 357/2005 Resolution.