Inspired by the work of the Secretariat for Submissions on Environmental Enforcement Matters of the United States-Peru Trade Promotion Agreement, this Article surveys other environmental submission mechanisms in Latin America, looking at similarities and differences. Beyond the criticisms made of these processes, they have value as independent international bodies to review the effective enforcement of a country’s domestic environmental laws, and provide opportunities to reach out to civil society about legitimate concerns. Two decades after the first submission in the context of the North American Free Trade Agreement, more than 150 submissions have been filed with all the secretariats. The Article highlights lessons learned, and proposes recommendations that may help these mechanisms continue to grow for the benefit of civil society and governments.