The Havasupai Tribe called the regulatory decision a "profound attack" on their responsibility to protect Grand Canyon waters from uranium mine contamination.

California boosted Delta pumping sixfold on July 1 while protecting endangered fish — and a new flexible permit approach pushed fish impacts to a near 10-year low.

A Pinal County irrigation district struck a deal for up to 10,000 acre-feet per year of Mojave Desert groundwater to offset deepening Colorado River shortages.

California commits $6 million to fight golden mussels as the invasive species spreads 500+ miles through state waterways in under two years.

Federal agencies awarded $44.3 million to restore salmon and sturgeon habitat and fund critical fish science studies across California's Central Valley rivers.

From a Supreme Court case that could influence interstate water rights for decades, to surprising California groundwater research, progress on the Tijuana River sewage crisis, a new study warning...