This study aims to analyze the GRI adherence and disclosure standards of sustainability reports of public and state institutions in the public agency sector. The Global Reporting Initiative Database (GRI) is used for the period 2011-2017, with a sample composed by 177 public agencies. The results show that there is an evolution in the publication of GRI sustainability reports by the public agencies analyzed. However, they represent only 1.8% of the total of all organizations. In addition, a large part does not correspond to the category of integrated reports, received no external assurance, and did not formalize any input or feedback on the report provided by a panel of stakeholders or expert(s), resulting in reports with poor quality and reliability.