According to the Law on Water Resources 2023, investigation and survey activities serving the establishment of water source protection corridors are basic investigation activities (Article 9). Clause 4, Article 29 of the Decree No.53/2024/ND-CP dated May 16th, 2024 also stipulates that the marking of water source protection corridors is carried out according to the technical instructions of the Ministry of Natural Resources and Environment. However, at present, there are no technical regulations and economic-technical norms for establishing water source protection corridors issued by competent authorities, causing difficulties in the establishment, appraisal and implementation. Therefore, in order to comply with the Law on Water Resources 2023 and legal documents as well as practical requirements of water resource management in the current period, the development and promulgation of a Circular regulating the technical regulations for establishing water source protection corridors is crucial.