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State of California Open Data

Appendix E: Hydrologic Region Basin Maps with Basin Tables

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Published by:
California Department of Water Resources
Last updated:
March 20, 2026
File details:
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Description:

This appendix provides a simplified summary of all basin maps and tables, organized by Hydrologic Region.

API endpoint

Dataset Name

Use the query web API to retrieve data with a set of basic parameters. Copy the API endpoint you need to start.

Usage documentation