The number of non-native species introduced into South Korea continues to grow, with nearly 110 tons of alien turtles imported from 63 countries over the past 20 years. Alien reptiles are popular pets, with about 39 species sold online and offline, some of which have been introduced into the wild. To date, five non-native turtle species and one genus are listed as "Ecosystem Disturbing Species" (EDS), with the common snapping turtle, Chelydra serpentina, to be added in 2022. In this study, we determined the establishment status of C. serpentina in natural ecosystems in South Korea through a literature review and identified the species by analyzing the DNA of eggs collected from nesting sites. We also analyzed the results of the review of the breeding moratorium application to understand the breeding status of C. serpentina at the time of its designation as an EDS in 2022. As a result, more than 70% of the 37 C. serpentina found in natural ecosystems in South Korea were identified through online searches or the National Animal Protection System, and DNA analysis of egg shells confirmed that one C. serpentina egg was suspected of breeding in the wild. Based on a review of 110 breeding moratorium applications from October 28, 2022 to April 27, 2023, a total of 155 individuals were confirmed to be in captivity, 66.5% of which were in private hands. As citizen reports accounted for the majority of cases of settlement, breeding and reproduction in the domestic natural ecosystem, it is believed that it is important to educate citizens about EDS and promote the management system. In addition, the year of C. serpentina breeding identified in this study was 2003, and the first import identified in the records was 2015, which are inconsistent with each other. Therefore, there is a need to integrate information from the ministries that manage the importation and distribution of invasive species and the organizations that designate and manage the receivership species.