Central Valley Groundwater Map and Forecast, release 2026-09.4d7c027a. (c) 2026 Will Gray.

These data are licensed under the Creative Commons Attribution 4.0 International licence (CC BY 4.0).
Full text: https://creativecommons.org/licenses/by/4.0/legalcode

You may share and adapt them for any purpose, including commercially, if you give appropriate credit, link to the licence and say if you changed them.

The input data keeps its own terms:
- Groundwater levels: California DWR, Periodic Groundwater Level Measurements (data.cnra.ca.gov, public domain); USGS CVHM2 observations
- Precipitation and temperature: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed 2026-10-22
- Evapotranspiration: OpenET ensemble v2.1 (https://etdata.org), CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/); sampled at the wells
- Vegetation (NDVI): NASA MODIS MOD13A2 v061 (Didan, K., doi:10.5067/MODIS/MOD13A2.061), via NASA AppEEARS
- Crop cover: USDA NASS Cropland Data Layer
- River flows: USGS NWIS. Project flows and water-year indices: California DWR CDEC. Allocations: U.S. Bureau of Reclamation (CVP) and California DWR (SWP)
- GSA boundaries (i03) and groundwater basins (i08 Bulletin 118, critically overdrafted basins): California DWR, data.cnra.ca.gov, Creative Commons Attribution (http://www.opendefinition.org/licenses/cc-by)
- Ground elevation: USGS 3DEP 1/3 arc-second DEM and DWR surveyed station elevations. Recharge soils: USDA-NRCS gNATSGO. Canals: (c) OpenStreetMap contributors (ODbL)
- NOAA outlook scenario: NOAA Climate Prediction Center long-lead outlooks. Disadvantaged communities: California DWR i16 (2023), CC BY. Domestic wells: DWR Well Completion Reports; dry wells: DWR Dry Well Reporting System