Groundwater Quality and Monitoring Management
To establish long-term data for groundwater quality across the country and to monitor the status of groundwater quality, the Ministry of Environment (MOENV) has constructed over 460 regional groundwater monitoring wells designed for background water quality investigations, as shown in Figure 1. To effectively utilize monitoring resources, the monitoring frequency has been evaluated and adjusted based on test results over the years, ranging from approximately once to four times a year. Items used for the analysis include general water quality parameters, heavy metals, and volatile organic compounds. In addition to organizing water quality monitoring and well management operations every year, the MOENV also conducted water quality investigations and research on items of concern for groundwater in 2022 and conducted rolling reviews of the Groundwater Pollution Control and Monitoring Standards to compose groundwater quality protection policies for the country.
The Department of Environmental Monitoring & Information Management of the MOENV initiated the monitoring tasks in 2002. The Department has adjusted the monitoring frequency based on inspection monitoring results to implement monitoring resources effectively
Figure 1. Distribution of groundwater areas and regional monitoring wells
Results of regional groundwater monitoring statistics
Compared to the Category 2 Groundwater Pollution Monitoring Standards, about 93.1% of the 2024 monitoring data met the Category 2 Groundwater Pollution Monitoring Standards, as shown in Figure 1. In addition, 100% of the 23 volatile organic compounds were lower than the Groundwater Pollution Control Standards.
Figure 1. Proportion of regional groundwater quality results below the Groundwater Pollution Monitoring Standards in 2024; (a) general water quality parameters, (b) heavy metals
Cross-sector alliance of sustainable management of groundwater resources
In order to enhance inter-agency collaboration and government-level resource sharing, the MOENV has invited the Council of Agriculture, Executive Yuan, and the Ministry of Economic Affairs and other relevant ministries to conduct cross-agency resource integration and collaborative discussions, as well as establish the Cross-Sector Alliance for the Sustainable Management of Groundwater Resources. The current efforts include the integration of groundwater information and the implementation of the division of labor among various ministries for arsenic-rich farmlands based on natural backgrounds, strengthening resource sharing and collaboration.
Please refer to the Environmental Water Quality Information