During the last decades, the participation of local governments gained importance, as one of the determining factors to reach socioeconomic development goals according to sustainability principles.Therefore, municipalities must have planning, assessment and control instruments which lead to proper environmental management.However, small-sized Colombian municipalities do not have enough resources or capacity to develop this kind of instruments; so that, these are elaborated by higher level entities, embracing regional and national stances using a top-down approach, which are few and scarcely efficient.The objective of this paper is to present a model of indicators that allows assessing the local authorities' management regarding environmental aspects.It was developed under a participative approach (bottom-up) conveying the insertion of vision and needs coming from the people responsible of the information and its users; and additionally, it is consistent with the indicators systems at national and regional stages.The municipalities of Nariño in Colombia, as well as the participation of the governing servants, the Contraloria Departamental de Nariño (CDN), as a control organism and Corporación Autónoma Regional de Nariño (Corponariño) that is the entity responsible of the implementation of the National Environmental Policy in the region, were taken as a case of study, in order to present a group of 40 environmental management indicators and a raw model to assess the results of the local environmental management, which take part in a planning and control instrument oriented to decision makers; additionally it turns to be an instrument to support monitoring, control and data presentation coming from the control organism.The results of the evaluation process of the municipalities are presented on the website gestionambiental.udenar.edu.