In order to ensure food safety and reduce environmental risks, in 2010 the Environmental Protection Administration (EPA) started conducting investigations on soil contamination of farmland every year in different regions. The investigation of farmland with high potential for contamination risks was completed nationwide in 2017, whilst improvements and prevention measures were carried out on soil in which heavy metals exceeded agricultural food crop standards. Furthermore, the previous investigation results showed that there were approximately 500 hectares of farmland remaining where heavy metal concentrations were found to be between monitoring standards and pollution control standards. Most of these farmlands were located in areas irrigated by drainage systems with high contamination potential, and farmland where contamination risks remained to increase. Thus, the EPA enacted The Working Principles for Regular Monitoring of Farmland Soil in 2019 whereby local governments are to monitor farmland in order to ensure the quality of soil.