Koh Brothers Eco Engineering Limited, an investment holding company, provides engineering, procurement, and construction services for infrastructure, water and wastewater treatment, building, biorefinery, and renewable energy projects. The company operates in two segments, Engineering and Construction, and Bio-Refinery and Renewable Energy. It undertakes various civil engineering and construction projects. The company also offers water and wastewater treatment solutions, such as engineering, manufacturing, and procurement services for infrastructure, specialist equipment, and turnkey systems, as well as project management, installation, performance trial, commissioning, training, and operation and maintenance services.