Name: MannKendallGWLTrendsCalGWLive

Display Field:

Type: Feature Layer

Geometry Type: esriGeometryPoint

Description: <div>Groundwater levels at selected wells were analyzed using the Mann-Kendall non-parametric test to determine whether a statistically significant trend (declining trend, no trend, or increasing trends in groundwater levels) was present during the specified time period. The data used came only from wells that have at least 10 years of data within the last 21 years. If a statistically significant trend was observed, the Theil-Sen method was used to calculate the estimated slope of the trend line to quantify the decline or increase.</div><div><br /></div><div>These trends 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</div><div><br /></div><div>This service is under development as part 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/.</div><div><br /></div><div>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.</div>

Copyright Text:

Min. Scale: 18489298

Max. Scale: 0

Default Visibility: true

Max Record Count: 2000

Supported query Formats: JSON, geoJSON, PBF

Use Standardized Queries: True

Extent:

XMin: -13833630.159598
YMin: 3926762.0351925
XMax: -12911811.6750568
YMax: 5162889.04862528
Spatial Reference: 102100 (3857)

Drawing Info:

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Has Attachments: false

Has Geometry Properties: false

HTML Popup Type: esriServerHTMLPopupTypeNone

Object ID Field: OBJECTID

Unique ID Field:

Name : OBJECTID

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Global ID Field:

Type ID Field: SlpSplits

Fields:

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• SITE_CODE (type: esriFieldTypeString, alias: Site Code, SQL Type: sqlTypeOther, length: 18, nullable: true, editable: true)
• STN_ID (type: esriFieldTypeInteger, alias: Station ID, SQL Type: sqlTypeOther, nullable: true, editable: true)
• WELL_DEPTH (type: esriFieldTypeInteger, alias: Well Depth (ft bgs), SQL Type: sqlTypeOther, nullable: true, editable: true)
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Attributes:

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• Basin_Name:
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Is Data Versioned: false

Has Contingent Values: false

Supports Rollback On Failure Parameter: true

Last Edit Date: 7/14/2025 3:04:09 AM

Schema Last Edit Date: 7/14/2025 3:04:09 AM

Data Last Edit Date: 7/14/2025 3:04:09 AM

Supported Operations:   Query   Query Pivot   Query Top Features   Query Analytic   Query Bins   Generate Renderer   Validate SQL   Get Estimates   ConvertFormat