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This article is the first one dealing with Submarine Groundwater Discharge (SGD) in the northern coast of state to confirm and quantify the SGD in four major lakes of this region -Itapeva, Quadros, Pinguela and Barros, applying seepage meter method. In each lake two sets of sampling stations were selected. A different behavior between margins was recorded. In the margins near the hills were identified advective process; and those close to the shore line, were dominated by infiltration process. The estimated volume of the SGD reaches the order of millions of cubic meters annually toward to these lakes, accounting for 13-27% of total contributions. Furthermore, utilizing water balance it was possible to evaluate the water balance between inputs and outputs as well as the residence time in each water bodies, which ranged from 19 to 847 days.

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