The main goal of this study is to present the result of an investigation carried out in the region of Belém and Ananindeua. State of Pará — Brazil. The study comprised mainly hydrogeological aspects, together with hydrochemical, geological and socioeconomic data, in order to make it possible to determine the conditions to the wise use of groundwater. This work will also contribute to the municipal and state planners with a set of technical, legal and socioeconomic, data to be used toward the water resource management in the studied area. The activities and the methods applied permitted to achieve significant results which include the characterization of the physical environment, with geomorphology, soil and climate aspects, superficial water characteristics, hydrogeological systems properties, geometrical aspects of the main aquifer units. characteristics of the groundwater flow, hydrogeochemical and bacteriological qualities of the groundwater , the estimation of the groundwater reserves and an insight on its vulnerability. Ali those technical aspects were analyzed together with the legislation framework, from the federal to the municipal scales. in order to make it possible to define the fundamental aspects to the groundwater use and protection planning and its role in the general water management practices in the studied area. The main products include a data base, inserted in a Geographic Information System (GIS), based in the SPRING 3.5.1 program, a set of thematic maps (geological, geomorphologic, hydrogeological, soils, etc.), and a set of tables and graphics showing the physical, chemical and bacteriological aspects of groundwater quality. Technical, social and political propositions were made, including hidroambiental education, institutional projects against poverty, increase of the law enforcement to protect the water resources, water save actions by the government, and joint projects toward water management. The main conclusions of the study permit to demonstrate that the main goals have been achieved, with a significant contributions to the Hydrogeology of the Belém and Ananindeua area and to the future projects involved water resources management.
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