We are a waste treatment company that generates revenue through design, development, manufacture, sales, installation, operation and maintenance of sewage treatment systems and by providing sewage treatment services. We primarily engage in two business lines: sewage treatment systems and sewage treatment services in both urban and rural areas. Sewage treatment systems are sometimes also referred to herein as rural sewage treatment, and sewage treatment services are sometimes also referred to herein as septic tank treatment.

For sewage treatment systems, we sell complete sewage treatment systems, construct rural sewage treatment plants, install the systems, and provide on-going operation and maintenance services for such systems and plants in China for municipalities and enterprise clients. We provide decentralized rural sewage treatment services with our integrated and proprietary system using our advanced quick separation technology. Our quick separation technology uses a biochemical process for economically and sufficiently treating rural sewage. In addition, our integrated equipment generally has a lifespan of over 10 years without replacement of the core components. Due to our quick separation technology and our technological expertise and experience, our integrated rural sewage treatment system produces a high quality of outflowing water, with high degrees of automation, efficient construction and start up, and low operational costs. In addition, our equipment is typically able to process abrupt increases of sewage inflows and high contamination. Our integrated equipment consists of a compact structure and is buried underground in order to minimize changes to the surrounding environment.

**Note: Net income and revenue figures are in U.S. dollars for the 12 months that ended June 30, 2023.

(Note: CDT Environmental Technology Investment Holdings Limited updated its financial statements for the six-month period that ended June 30, 2023, in an F-1/A filing dated Nov. 20, 2023.)

(Note: CDT Environmental Technology Investment Holdings Limited downsized its micro-cap IPO at pricing to 1.5 million shares – down from 2.0 million shares in the prospectus – and priced the IPO at $4.00 – the low end of its $4.00-to-$5.00 price range – to raise $6.0 million on April 17, 2024. Background: CDT Environmental Technology Investment Holdings Limited cut its IPO’s size by about 35 percent to 2.0 million shares – down from 3.07 million shares – and increased the price to a range of $4.00 to $5.00  – up from an assumed IPO price of $4.00 – to raise $9.0 million, according to an F-1/A filing dated March 27, 2023. CDT Environmental Technology Investment Holdings Limited updated its financial statements in an F-1/A dated Feb. 24, 2023. The company changed its sole book-runner to WestPark Capital from ViewTrade Securities in an F-1/A filing in June 2021. The F-1 was filed on Jan. 15, 2021. The company submitted confidential IPO documents to the SEC on Nov. 15, 2019.)