This paper reports on sulfuric acid resistance of a strainhardening fibre-reinforced geopolymer composite, named Engineered Geopolymer Composite (EGC). EGC is a promising material for durable and resilient wastewater infrastructure applications due to its acid-resistant geopolymer matrix and high tensile ductility along with self-controlled microcracking. In the present study, the weight loss, residual compressive and flexural strengths, and deflection capacity of acid-exposed EGC specimens are experimentally investigated. In comparison with normal cement concrete and Engineered Cementitious Composite (ECC), EGC exhibited a three times slower rate of weight loss and no significant degradation in mechanical performances.