A new binational study maps how groundwater moves, recharges and changes beneath the Santa Cruz region of Arizona and Sonora.

California is flooding Suisun Marsh wetlands in summer to produce tiny organisms that provide food for native fish, including Delta smelt.

A World Economic Forum opinion calls the Colorado River’s supply-demand imbalance “water bankruptcy” and points to ways to address it.

California's new data center laws require more disclosure about water use, supplies, efficiency and drought planning.

New testing found PFAS in 43 wells in La Cienega and La Cieneguilla as officials investigate the extent of groundwater contamination.

Federal agencies are seeking public input on which waters and wetlands should fall under the Clean Water Act. Comments close October 9.