Orissa International undertook a research project for a UK company which has expertise in sustainable sewage treatment solutions. We identified potential opportunities for its products in the ASEAN region, focusing on popular resort islands where there is a pressing need for wastewater treatment. Our report examined the potential for decentralized wastewater treatment solutions in 7 islands located across South East Asia. It described the existing (or lack of) sewage treatment systems in place, levels of pollution, government regulations and analyzed opportunities in the market.