North OC Watershed Management Area

*** Please visit for the most up-to-date information on Integrated Regional Water Management (IRWM) efforts in North and Central Orange County. ***

Efforts to develop a combined Integrated Regional Water Management (IRWM) Plan for the North and Central OC Watershed Management Areas (The OC Plan) began in February 2017.  The comment period for The OC Plan closed on December 22, 2017.  Responses to the comments have been prepared and are available here.  The OC Plan, completed in March 2018, is available here.

For more information about the North/Central WMAs, IRWM Plan (OC Plan), project submittal and selection processes, and opportunities for stakeholder involvement, please visit


The North OC Watershed Management Area (WMA) encompasses 241,000 acres (376 square miles) in Northern Orange County. The NOC WMA is bordered by Los Angeles County to the North and West and to the East by San Bernardino County. The three watersheds in this area are the San Gabriel River/Coyote Creek, Anaheim Bay-Huntington Harbour and the Santa Ana River. All three watersheds lie within the Santa Ana Regional Water Quality Control Board boundary. The NOC WMA includes all of the cities of Anaheim, Brea, Buena Park, Cypress, Fountain Valley, Fullerton, Garden Grove, Huntington Beach, La Habra, La Palma, Los Alamitos, Placentia, Seal Beach, Stanton, Villa Park, Westminster, and Yorba Linda, and portions of the cities of Costa Mesa, Orange, Newport Beach, and Santa Ana, as well as unincorporated areas of Orange County.

North Orange County Integrated Regional Water Management Plan (NOC IRWMP)

Efforts to develop an Integrated Regional Water Management Plan for the NOC WMA began in June, 2007. Stakeholder meetings focused on developing goals and objectives for the region, and began to collect ideas for potential projects to be included in the Plan.

On July 27, 2010 the California Department of Water Resources (DWR) released the final guidelines for the Proposition 84/1E grant program. These guidelines established the general procedures and criteria that DWR is using to implement each Integrated Regional Watershed Management grant program. Based on these guidelines the NOC WMA Plan was restructured to follow DWR Proposition 84/1E guidelines.

The public comment period for the NOC WMA plan closed on January 28, 2011. Comments were received and incorporated in the final plan. The final NOC WMA plan is below, each section of the plan is a separate file for ease of use.

  1. Cover, TOC and Figures
  2. Executive Summary
  3. Section 1 Introduction
  4. Section 2 Governance
  5. Section 3 Regional Description
  6. Section 4 Objectives
  7. Section 5 Resource Management Strategies
  8. Section 6 Regional Priorities & Implementation
  9. Section 7 Data Management
  10. Section 8 Finance
  11. Section 9 Technical Analysis
  12. Section 10 Coordination with Existing Local/Regional Plans
  13. Section11 Stakeholder Involvement
  14. Section 12 Climate Change
  15. NOC IRWMP Project Matrix

North OC WMA

If there are any questions regarding the details of a document, or to obtain a hard copy or other alternative formats of the original document, or to have a document read to you, please contact the OC Public Works offices, Monday through Friday, 7:30 am to 5:00 pm PST, at 2301 N. Glassell St., Orange, CA, 92865 by email at  OC Watersheds, or by phone at (714) 955-0600.