Table 1

Number of Counties and Areas Affected by Land Subsidence in the San Joaquin Valley, California, 2015–2021

No. of Counties with SubsidenceTotal Subsidence Area (km2)Area Under Low Subsidence (km2)aArea Under High Subsidence (km2)b
2015711,1008,4972,603
201676,6526,62923
201788,2607,1671,093
201876,2806,2719
2019710,88510,075810
2020710,9369,1191,817
2021712,2629,8952,367

  • Note: Subsidence occurred in parts of the counties, not entire counties.

  • ↵a Low subsidence is < 0.18 m per year.

  • ↵b High subsidence is ≥ to 0.18 m per year.