GB/T 5750.3-2023 standard specifies the quality control requirements and methods for water quality inspection laboratories for drinking water and source water. This standard is applicable to the analysis process of drinking water and source water quality to ensure the accuracy and Reliability of test results. The standard covers all aspects of quality control, including method verification, precision, Precision and other requirements, as well as statistical treatment and outlier treatment of data. The implementation of this standard helps to ensure that the analysis results of water quality inspection laboratories meet the requirements of the standard, providing a scientific basis for ensuring the safety of public drinking water.