Abstract
Hydrology![Figure][1] Seepage of coastal groundwater rich in iron and other dissolved constituents PHOTO: MATTHIJS WETTERAUW/ALAMY STOCK PHOTO Not all groundwater ends up flowing into rivers. Some is discharged directly into the ocean along the coast. Although much lower in volume than water transported by rivers, such submarine groundwater discharge can be a hidden source of dissolved ions, nutrients, or contaminants from human activities. Sawyer et al. performed a high-resolution continental-scale analysis of fresh groundwater discharge along the coastline of the United States. In total, more than one-fifth of coastal waters are vulnerable to groundwater-borne contamination. Science , this issue p. [705][2] [1]: pending:yes [2]: /lookup/doi/10.1126/science.aag1058
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