Select Groundwater-Quality and Quality-Control Data from the National Water-Quality Assessment Project 2019 to Present (ver. 4.0, April 2025)

Groundwater samples were collected and analyzed from 1,015 wells as part of the National Water-Quality Assessment Project of the U.S. Geological Survey National...作为美国地质调查局（U.S. Geological Survey）国家水质评估项目的组成部分，研究人员从1015口井中采集地下水样本并开展了分析检测工作。