The World Organization for Animal Health said in a Jan. 27 notification that the H5N9 strain of avian bird flu has been detected for the first time at a duck farm in Merced County, California.

California policymakers are considering state ownership of one or more oil refineries to ensure a reliable supply of gasoline as the number of refineries in the state declines. An oil industry ...

Crews began clearing roads across Southern California on Friday after an atmospheric river brought heavy rain that triggered rounds of evacuations and closures as it unleashed damaging mudslides ...

Seismologists are closely monitoring California's fault lines as concerns grow about the possibility that the "Big One" could happen soon. The "Big One" refers to a massive earthquake that could ...

Editor's note: This page reflects news from Wednesday, Feb. 12. For the latest updates on the atmospheric river in California, read USA TODAY's coverage for Thursday, Feb. 13. SAN DIEGO ...

In late January, U.S. health officials announced that a new strain of avian flu, H5N9, was discovered on a duck farm in Merced County, California. They quarantined the farm and destroyed nearly ...