On December 31, 2025, the Office of the Comptroller General of the Republic approved Supreme Decree No. 17 of 2025, issued by the Ministry of the Environment, which introduces amendments to the Regulations of the Environmental Impact Assessment System (“SEIA”).

The purpose of this reform is to update the criteria, thresholds, and project typologies subject to environmental assessment, incorporating the experience gained from the application of the SEIA, as well as regulatory and technological advances. The amendments have a cross-cutting impact on various sectors, including energy, real estate, mining, industry, tourism, waste management, sanitary services, transportation, and agriculture.

Among the main changes are the updating of the thresholds for entry into the SEIA, the clarification of definitions and technical criteria regarding waste and hazardous substances, and the adjustment of the criteria applicable to amendments to previously assessed projects.

The amendments to the SEIA Regulations will enter into force upon publication of the decree in the Official Gazette and will apply to projects submitted to the SEIA from that date onwards.

Below, our Environmental team presents a summary of the main changes introduced by this reform.

Click here to access the document.