The two authors, together with an international team of researchers, are involved in a project, DigiMon "Digital monitoring of CO2 storage" which aims to create a configurable, hierarchical, distributed monitoring system for CO2 storage that will ensure safety in exploitation. The overall objective of the DigiMon project is to accelerate the development of an affordable, intelligent, flexible and society-integrated digital monitoring early warning system for monitoring CO2 geological storage reservoirs. The objectives are to develop and combine distributed fiber optic sensing technology, seismic point sensors and gravimetry with Ethernet-based digital communications and web-based intelligent realtime data processing software with social partner risk information potential in the area. Decision Support Systems (DSS) supports the choice of concept and solution, assisting the decision-maker in organizing information, modeling results and making decisions as an operator guide. The concept proposed by DSS aims, based on a system structure, to provide help in formulating alternatives, accessing data, developing models and interpreting their results. The social partners that must be informed are defined by the legislation of each country and have a role in monitoring environmental risk situations and crisis management.This paper presents the system concept and the component blocks and their role.