CDT Environmental Technology Investment Holdings Ltd, through its subsidiaries, operates as a waste treatment company. It generates revenue through the design, development, manufacture, sales, installation, operation, and maintenance of sewage treatment systems and by providing sewage treatment services. The Group engages in two business lines: rural sewage treatment and septic tank treatment in both urban and rural areas. For rural sewage treatment, it provides end-to-end rural sewage treatment solutions in China, including system sales, plant construction, installation, and ongoing maintenance for municipal and enterprise clients. For septic tank treatment, it offers on-site, or in-situ, septic tank treatment services with its proprietary systems for different customer segments in China.