Northern California's first human West Nile virus case of the year has been confirmed in Butte County, according to local ...

More than 100 small earthquakes have been recorded near the Geysers geothermal field in Northern California since just after midnight Thursday, according to the U.S. Geological Survey.

California has tried to eradicate ugly South American swamp rodents called nutria. Shooting destructive nonnative mute swans ...

Cooler air and a Delta breeze creates a very pleasant weekend in Northern California, though a few showers are possible in the Northern Sierra.

A student in Northern California tested positive for active tuberculosis on Thursday, according to public health officials. • ...