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We consider a shallow aquifer as an integrative system of putative deep CO2 leaks above a CO2 geological sequestration test site. This would help to built sensitive and reduce cost monitoring of near surface CO2 induced perturbations. To study this potentiality, we have monitored the dissolved carbon dynamic (dissolved CO2 species) and main chemical parameters in the aquifer waters of Jurançon Hills (Near Pau, France). Over three years, we have collected a set of data (conductivity, geochemistry, isotopes) at four springs. We are able to able to interpret the dynamics of the dissolved CO2 by a variety of natural forcings (biological, hydrodynamics, water-rock interactions, … which are mainly related to the climatic forcing). This study and geochemical modeling allow us to build proxies that must very sentitive to non-natural inputs of CO2.