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Abstract Some wastes are illegally dumped on public/private areas, causing several aesthetic, environmental, economic and social negative impacts and representing a public hazard. These sites need to be treated and managed and this task is often a responsibility of municipalities, representing high costs. However, there is a lack of strategies for the municipal management of these degraded areas that minimize costs, restore the ecological value of the area and eliminate the public hazard. This work proposes a conceptual model for the management of illegal dumping degraded areas by municipal services, based on a social life cycle assessment (SLCA). The model proposed is an open-participatory management tool which supplies the information needed for the waste management strategy for illegal waste deposit sites. Methods to evaluate and apply SLCA in this context are scarce. Therefore, SLCA is presented as a tool that can be applied to organisations in strategic analysis and structuring complex decision-making processes in order to identify optimisation potentials. It combines an environmental and a socio-economic assessment, contributing to the full assessment of products and services within the context of sustainable development. The framework intends to promote the improvement of social conditions and the socio-economic performance of a product throughout its life cycle for all the stakeholders involved within the context of sustainable development. Illegal deposits sites of Construction and Demolition Wastes (CDW) in municipalities are used as a case study for model implementation. The outputs of this model are: i) understanding the real situation of the illegally deposited wastes; ii) management practices comparing and integrating environmental, social, and economic objectives; iii) open-participatory management; iv) orientations to strategy definition; v) use of the life-cycle product principle contributing to a circular economy; and vi) assisting with municipalities performance. [ABSTRACT FROM AUTHOR]