California's Groundwater Basin Boundary Descriptions

In conjunction with the release of California’s Groundwater Update 2020, DWR has compiled a comprehensive list of the official basin boundary descriptions for all of California’s 515 groundwater basins. These descriptions were originally developed by DWR as part of California’s Groundwater (B-118) Update 2003 and have since been updated for some groundwater basins as a result of the 2016 and 2018 Basin Boundary Modifications. To make locating descriptions easier, they have been organized by region which is determined by the first number of the basin number (i.e. 1-XXX).

The original basin descriptions developed for California’s Groundwater (B-118) Update 2003 also included summaries of the hydrologic and hydrogeologic setting, groundwater storage capacity and water budget, groundwater level and quality trends, well yields, basin management, and references. This additional information contained in the basin descriptions will now be referred to as “basin reports” and are still available online as part of the Bulletin 118 - Update 2003 report.

Data and Resources

Field Value
accessLevel public
catalog_@context https://project-open-data.cio.gov/v1.1/schema/catalog.jsonld
catalog_conformsTo https://project-open-data.cio.gov/v1.1/schema
catalog_describedBy https://project-open-data.cio.gov/v1.1/schema/catalog.json
identifier 90074e0e-9fb0-49c9-a0ef-3f02b806b415
issued 2021-08-09T17:55:13.274349
modified 2021-10-27T15:17:13.463505
publisher California Department of Water Resources
resource-type Dataset
source_datajson_identifier true
source_hash 262bcea41cfda8b6e84d250e07b6340b64fc3cf0
source_schema_version 1.1
theme {"Natural Resources",Water}
Groups
  • AmeriGEOSS
  • National Provider
  • North America
Tags
  • amerigeo
  • amerigeoss
  • basin-boundary
  • california-department-of-water-resources
  • ckan
  • descriptions
  • geo
  • geoss
  • groundwater
  • national
  • north-america
  • sgma
  • united-states
  • water
isopen False
license_id notspecified
license_title License not specified
maintainer Sustainable Groundwater Management Office
maintainer_email sgmps@water.ca.gov
metadata_created 2025-11-20T01:42:05.197529
metadata_modified 2025-11-20T01:42:05.197533
notes In conjunction with the release of [California’s Groundwater Update 2020](https://data.cnra.ca.gov/dataset/caglw_update2020), DWR has compiled a comprehensive list of the official basin boundary descriptions for all of California’s 515 groundwater basins. These descriptions were originally developed by DWR as part of California’s Groundwater (B-118) Update 2003 and have since been updated for some groundwater basins as a result of the 2016 and 2018 [Basin Boundary Modifications](https://water.ca.gov/Programs/Groundwater-Management/Basin-Boundary-Modifications). To make locating descriptions easier, they have been organized by region which is determined by the first number of the basin number (i.e. 1-XXX). The original basin descriptions developed for California’s Groundwater (B-118) Update 2003 also included summaries of the hydrologic and hydrogeologic setting, groundwater storage capacity and water budget, groundwater level and quality trends, well yields, basin management, and references. This additional information contained in the basin descriptions will now be referred to as “basin reports” and are still available [online](https://data.cnra.ca.gov/dataset/bulletin-118-update-2003-basin-reports) as part of the [Bulletin 118 - Update 2003](https://data.cnra.ca.gov/dataset/california-s-groundwater-bulletin-118-archive/resource/5fc7e39c-34e7-433e-9dbe-ff93ce76787f) report.
num_resources 9
num_tags 14
title California's Groundwater Basin Boundary Descriptions