Traces of long-banned pesticides persist in U.S. groundwater, a new U.S. Geological Survey study shows, even as concentrations of most chemicals generally declined.

California’s Central Valley is still sinking. This reality has had scientists worried for more than a century, but a recent study reveals the troubling phenomenon may now be affecting the local ...

Often called “the world’s smallest mountain range,” the Sutter Buttes are an unlikely and beloved landmark in one of the flattest parts of the state. By Soumya Karlamangla The Sutter Buttes are a ...