The Integrated Regional Water Management Plan for the Upper Santa Ana River (IRWMP) was Initially adopted at a public hearing held on December 6, 2007, through the adoption of pdf Resolution No. 435 (345 KB) .  The 2020 IRWMP update was reviewed by all agencies and adopted by the Conservation District Board on June 9, 2021, through the adoption of  pdf Resolution No. 588. (79 KB)  Links to those files are listed below:

• Executive Summary
• Part 1 - Regional Context
• Part 2 - Local Agency Information
• Part 3 - Regional Supporting Information
• Part 4 - UWMP Agency Supporting Information
• ISARM Summary
•   pdf Addendum Active Recharge Project  (11.54 MB)
•   pdf SBBA Storm Water Flow & Capture  (144.08 MB)

 Historical documents can be found below: 

• Executive Summary pdf (1.04 MB)
• Chapters 1-9
• Appendices A pdf (4.30 MB)
• Appendices B
• Appendices C
• Appendices D
• Appendices E
• Appendices F
• Appendices G
• Appendices H
• Appendices I 
• Appendices J