CDT Environmental Technology Investment Holdings Ltd is a holding company principally engaged in design, development, manufacture, sales, installation, operation and maintenance of sewage treatment systems and provision of sewage treatment services. The Company operates its businesses through two segments. The Sewage Treatment Systems segment sells complete sewage treatment systems, constructs rural sewage treatment plants, installs the systems, and provides on-going operation and maintenance services for such systems and plants in China for municipalities and enterprise clients. The Sewage Treatment Services segment offers on site, or in-situ, septic tank treatment services in the urban and rural areas of China for municipalities and residential and business property management companies.