In the framework of the project of exploitation of the quality control network of the groundwater of the Guadalquivir Basin, the Department of Territorial Information of Andalusia has developed the Brocal system. It is a Geographic Information System in a web environment that supports both information management tasks and its alphanumeric, graphic and geographic exploitation. Brocal is a technologically advanced system, aligning with the latest development trends in spatial information technologies and web environment and mainly based on open sources free software components, only the database escapes this condition, there is a corporate agreement of the client for the use of the DBMS Oracle.