CDT Environmental Technology Investment Holdings Limited designs, develops, manufactures, sells, installs, operates, and maintains sewage treatment systems in China. The company sells complete sewage treatment systems; constructs rural sewage treatment plants; installs systems; and provides on-going operation and maintenance services for systems and plants in China for municipalities and enterprise clients. It provides sewage treatment services, such as on-site or in-situ septic tank treatment services in the urban and rural areas for municipalities, and residential and business property management companies.