On March 5-15th, two ladies of our group, Zhang Ruiling and Liu Xin took a trip to Jinjing, Changsha, Hunan Province for water sampling in a small catchment. This sampling campaign was designed to investigate prevalence of antibiotic use in a typical socialist new countryside (金井镇脱甲村) based on wastewater epidemiology. It’s also part of the ongoing Dongting Lake Programme. The two ladies selected 10 sites in Tuojia catchment (脱甲河流域). A total of 30 o-DGT (organic-diffusive gradients in thin-films) passive samplers were deployed for 7 days and fully retrieved, grab water and sediment samples were also collected. At one of the sampling sites, they collected 24 h composite water per day using a small peristaltic pump. They appreciate great support from Institute of Subtropical Agriculture, the CAS (中科院亚热带农业生态研究所) for guiding in the field and offering a lab at Changsha Agricultural Environment Station, the CAS (中科院长沙农业环境站). The sampling was fairly smooth and they took the opportunity to better prepare for upcoming sampling campaign in Hanoi, Vietnam.