Seasonal Groundwater Level Changes 1, 3, 5 and...
Seasonal groundwater level reports provide information from selected water level measurements and are intended to portray the change in seasonal groundwater levels over specific time intervals. Each point shows the calculated difference between the measured groundwater levels from the selected time periods. The change in groundwater level is plotted on the map only if a measurement exists in both time periods at a well.
These change values are derived from the DWR Periodic Groundwater Levels dataset that contains seasonal and long-term groundwater level measurements collected by the Department of Water Resources and cooperating agencies in groundwater basins statewide. It also includes data collected through the Sustainable Groundwater Management Act (SGMA) Portal’s Monitoring Network Module (MNM), and the CASGEM (California Statewide Groundwater Elevation Monitoring) Program. Most measurements are taken manually twice per year to capture the peak high and low values in groundwater elevations. However, the dataset also includes measurements recorded more frequently, monthly, weekly, or daily. The complete DWR Periodic Groundwater Levels dataset is available at https://data.cnra.ca.gov/dataset/periodic-groundwater-level-measurements.
This service is under development in support of ongoing enhancements to CalGW Live. Once the format is finalized, the service will be hosted at https://gis.water.ca.gov/arcgis/rest/services/.
DWR makes no warranties or guarantees — either expressed or implied — as to the completeness, accuracy, or correctness of the data. DWR neither accepts nor assumes liability arising from or for any incorrect, incomplete, or misleading subject data.
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Additional Information
| Field | Value |
|---|---|
| Data last updated | August 8, 2022 |
| Metadata last updated | November 20, 2025 |
| Created | August 8, 2022 |
| Format | unknown |
| License | License not specified |
| Datastore active | False |
| Has views | False |
| Id | 6e69eb68-7bfa-4e50-a70e-b1f33d2dd3d9 |
| Package id | 11bad56c-dcd3-4124-b2d6-e2da29ab4bfb |
| Position | 6 |
| State | active |