The relevance of this study is due to the lack of a scientifically developed concept of the formation of sustainability indicators for small enterprises operating in the environmental field. The purpose of the study is to develop a mechanism for the economic sustainability of environmental organizations, which is based on competition, centralization of management, and business activities. In addition, the paper analyzed the modern theory and practice of managing production structures, studied the main factors affecting the system of indicators of the organization’s sustainability. A methodology that allows for diagnostics and assessment of the sustainability of an enterprise is proposed. The financial mechanisms that ensure the process of financing environmental activities are studied.