This study investigated the question of whether environmental sustainability influences firm performance. Firm performance, a multidimensional construct, was researched utilizing innovation, ecological and social measures on the premises of SMEs in South Africa. Thus, the study hypothesized that environmental sustainability is positively and significantly related to innovation, ecological and social measures of firm performance. A cross-sectional research design was adopted in this study to test the abovementioned hypotheses. A total of 208 self-administered questionnaires distributed to SME owners and managers were analyzed utilizing structural equation modelling (SEM) and Amos Version 24 software. Primarily, the study established that environmental sustainability was significantly and positively correlated to all three measures of firm performance used in this study. Thus, the inferences from the findings suggest that environmental sustainability practices contribute positively towards firm innovation, ecological and social performances. The findings of this study greatly contribute towards the practice and theory of small businesses and firm performance by providing a more specific and streamlined perspective for approaching firm performance.