A Department of Water Resources report says groundwater levels throughout California are at historic lows.

The 51-page report says in many areas of the Central Valley groundwater levels this spring are more than 100 feet less than the previous historic lows.  

Researchers say this report is particularly alarming because they are based on springtime well measurements, when groundwater levels are typically high.

Concerns about groundwater levels began to grow last summer, now the report shows most of the recently deepened wells are in the fractured bedrock foothill areas of Nevada, Placer, and El Dorado counties. 

Check out the full report here.