Purpose This study aims to present the environmental management system implemented at UNISINOS and demonstrate some of the main results obtained in more than 15 years carrying out the environmental management of the campuses in São Leopoldo and Porto Alegre. The focus is on the main environmental impacts: electricity consumption, water consumption and solid waste management. Design/methodology/approach Sustainable development of universities has gradually become a common practice, as the knowledge shared in the higher education institutions reflects in the behavior of society. In a university, an environmental management system is used to plan, implement and manage processes referring to the environmental, social and economic aspects, so as to improve their performance and comply with legal requirements. For this, national or international standards and/or methodologies can be followed, which serve as a guide for the institution to reach sustainability in a staggered manner, according to the availability of data and resources for environmental management. Findings After 16 years of certification, based on the monitoring performed, positive performance was observed, reflecting a better and attentive university, with an environmental policy that goes beyond the borders of the campuses and transmits solid concepts of environmental education to the academic community, under the rigid control of the ISO 14001 tool. Originality/value In 2004, UNISINOS became the first Latin American university with an ISO 14001 certification. In 2018, the certification was extended to the UNISINOS Campus in Porto Alegre, capital of the state of Rio Grande do Sul. All the support activities conducted and implemented in the campuses (São Leopoldo and Porto Alegre) follow the same rules implemented by the UNISINOS environmental management system. After the experience of implementing the ISO 14001 requirements, UNISINOS included other normative requirements in 2013, adopting an integrated management system.