Decadal trends and occurrence of geogenic constituents and mixtures in groundwater across the continental United States
Environmental Science and Technology - Water
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Abstract
Worldwide, about 50% of the population is served by groundwater-sourced drinking water. Numerous groundwater quality assessments have found that geogenic constituents are among the most common contaminants in drinking-water aquifers. Documenting changing groundwater quality is a crucial aspect of water availability assessments. We assess trends and occurrence of geogenic constituent concentrations in groundwater across the continental United States using 3 decades of data from the U.S. Geological Survey’s National Water Quality Network. Thousands of groundwater wells were grouped into agricultural, urban, or domestic supply network types. Although most networks and constituents had no statistically significant change in concentration, many had increasing concentration trends, elevated concentrations, or both. Lithium, sodium, radium, sulfate, and uranium had increasing trends in more than 10% of the study networks. Urban and domestic well networks had increasing lithium and sodium trends more often than agricultural networks. Manganese most commonly increased in domestic well networks; uranium more commonly increased in agricultural and urban networks. Elevated concentration mixtures were widespread, and mixture complexities appeared to increase over time. Our results indicate that more than 2.3 million domestic-well users may be affected by elevated concentrations of one or more geogenic constituents.
Suggested Citation
Erickson, M.L., Elliott, S.M., Musgrove, M., Hinman, E., Sleckman, M.J., Stackpoole, S.M., Lindsey, B.D., 2026, Decadal trends and occurrence of geogenic constituents and mixtures in groundwater across the continental United States: Environmental Science and Technology - Water, v. 6, no. 2, p. 664-678, https://doi.org/10.1021/acsestwater.5c00756.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Decadal trends and occurrence of geogenic constituents and mixtures in groundwater across the continental United States |
| Series title | Environmental Science and Technology - Water |
| DOI | 10.1021/acsestwater.5c00756 |
| Volume | 6 |
| Issue | 2 |
| Publication Date | January 27, 2026 |
| Year Published | 2026 |
| Language | English |
| Publisher | American Chemical Society |
| Contributing office(s) | Upper Midwest Water Science Center |
| Description | 15 p. |
| First page | 664 |
| Last page | 678 |
| Country | United States |
| Other Geospatial | continental United States |