The principles of reviewing and adjusting each water monitoring procedure are that they must meet the requirements of regulatory standards and are conducive to data analysis and the reviewing of pollution causes. Analysis operations follow the standards of “The General Provisions of Environmental Testing Quality Control Guidelines” (NIEA-PA101 ) and “The General Principles of Water Testing Methods” (NIEA W102.51C) announced by the Environmental Analysis Laboratory, MOENV, and use related categories’ testing methods to conduct water quality testing. However, as the composition of environmental water bodies is complicated, it is difficult to define the concentration range for water pollutants. In order to meet the high requirements for monitoring data quality, the testing methods for some specific items are more stringent. For example, the ammonia-selective electrode method and digestion method are not allowed in the ammonia-nitrogen test; the brucine method is not allowed in the nitrate nitrogen test; Methyl isobutyl ketone (MIBK) cannot be used for the extraction of the heavy metal hexavalent chromium; and the measurement of transparency is limited to only using the Secchi disk of 30 centimeters in diameter. Related testing methods are available in the water quality monitoring method section in the website.