This study develops and applies a methodology for monitoring, controlling, and evaluating key performance indicators to improve environmental sustainability and promote transparency and environmental awareness on university campuses. To analyse the environmental behaviour of the university community, the daily number of people on campus was estimated, and the rates of solid waste generation, water consumption, electricity consumption, greenhouse gas emissions, and open urban green space were evaluated. Data collected from 2017, 2018, 2019, and 2022 at the Universidad Católica del Norte campuses in Antofagasta and Coquimbo, Chile, were used to assess environmental performance, with comparisons drawn to other universities worldwide. Overall, both university campuses reduced the generation of waste and CO2-eq emissions, as well as water and electrical energy consumption, mainly due to good environmental practices and infrastructure improvements. The study also emphasises integrating sustainability practices into university operations and academic programs, aligning with global sustainability goals. Despite limitations, considering the exclusion of COVID-19 years and lacking detailed water and electricity data, the study presents a replicable methodology for other higher education institutions to assess and improve their sustainability performance. The findings contribute to the growing knowledge of sustainable campus management and the critical role of universities in addressing pressing global environmental challenges.