The aim of this study is to establish a classification for environmental indicators that can be used to communicate companies’ environmental performance in Emas Environmental Statements and to assess their actual use in certified Environmental Statements. Starting from the ISO14031 draft indicators classification we have tried to verify its correspondence with EMAS EEC Council Regulation (93/1836/EEC) requirements and definitions, and therefore we have established a more appropriate classification according to the information the different indicators can provide. The evaluation of environmental indicators’ use in Environmental Statements has been performed through the analysis of a sample of 62 certified EMAS Environmental Statements.