An automatic multiparametric equipment (groundwater temperature, electrical conductivity. pH, 222Rn) has been planned and realized to study the correlations between the variations of radon with the strain processes of the rock and transport properties related to the groundwater geochemistry. The monitoring activity at underground laboratories of Gran Sasso with a groundwater sampling period of twelve hours has been started from May 1996. From geochemical data recorded during the first year a high dynamic behavior of shallow aquifer has been emphasized due to high permeability of the cretaceous limestones that form part of the Gran Sasso massif. Also, the residual time series analysis of the geochemical parameters has emphasized pre-co seismic anomalies in electrical conductivity and postseismic in radon content in groundwater related to local seismicity. ¿ 2001 American Geophysical Union