The California Department of Water Resources (DWR) released new satellite-based data that show subsidence – or the sinking of the land surface due to excessive groundwater pumping – continues in the state. DWR has intensified statewide subsidence monitoring to help identify impacts and address them collaboratively with local groundwater agencies, counties and landowners.
The areas experiencing the most subsidence during Water Year 2021 (WY 2021) are in the San Joaquin Valley, with a maximum of 1.1 feet of subsidence observed in the region and the Sacramento Valley with a maximum of 0.7 feet in the region. Data show that in WY 2021 subsidence of greater than 0.5 feet per year expanded to more areas than observed in WY 2020. However, fewer areas experienced higher rates of subsidence than at the end of the last drought in 2016.