Environmental emergencies usually affect urbanized regions or their surroundings, becoming urban disasters. Disasters come from extreme events, whether of natural or technological origin, which result in a number of negative impacts on cities. These factors are consequence of the lack of preparation of their managers and communities to face these situations, besides a chain of failures from inefficient planning, legislation and inspections. Thus, it is necessary to analyze the structural organization of public bodies to act in order to mitigate these events or their effects. In this line, there is not only an organ, but a system called Protection and Civil Defense. The State of Paraná, which has a relevant history in terms of environmental emergencies, finds in it civil defense an aggregating nucleus of institutions to deal with this issue. This article is dedicated to analyzing this structure, its potential and presents alternatives for the improvement aimed at the effectiveness of existing and available resources.