Estarreja is known for its chemical complex, and several studies were performed in the region to evaluate the presence of contaminants in environmental matrices. Some hotspots of contamination were identified, nevertheless, the real dimension of the problem, i.e. the spatial distribution of organic and inorganic contaminants and the potential risks to the environment and human health, is not well understood. Indeed, despite decades of research and almost ten years after the OHM-Estarreja creation, it is still not clear if we are dealing with a contamination or with a real pollution problem. The reason why this issue was not yet clarified is related with the complexity of the problem (several matrices, types of contaminants and land uses; legacy of the past vs recent contamination) and because most of the studies are focused on a specific question and the data are scattered. In this context, a risk assessment analysis, is the best available tool to clearly understand the problem and to identify knowledge gaps. Thus, this study aims at collect and integrate existing data to understand the spatial distribution of contaminants, identify areas and contaminants of concern, the receptors and the ecosystem services at risk. As a final output it is intended to obtain a conceptual model that will support decisions regarding the management of this area as well as implementation of an analysis, monitoring or a remediation program. This will contribute for focusing the management of future OHM funds for achieving the ambitious goal of mitigating Estarreja environmental legacy.