Environmental regulators strive to protect the environment and public health from pollution from economic activity. This report uses the OECD Performance Assessment Framework for Economic Regulators (PAFER) to assess both the internal and external governance of Ireland’s Environmental Protection Agency (EPA). It looks at the EPA’s role and objectives, its financial and human resources, processes for internal management and decision making, and systems for performance assessment. The review acknowledges the EPA’s achievements and good practices, analyses the key drivers of its performance, and identifies a number of challenges and opportunities for improvement to help the regulator prepare for the future.