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The Water Emergency Response Organization of Orange County (WEROC), administered by the Municipal Water District of Orange County, supports and promotes countywide emergency preparedness, planning, and response efforts among Orange County water and wastewater utilities.

The Water Emergency Response Organization of Orange County (WEROC) coordinates and supports an effective emergency response to a major disaster on behalf of all Orange County water and wastewater agencies. To carry out this mission WEROC provides services that promote planning and preparedness activities for both the agencies, as well as its own Emergency Operations Center (EOC) volunteer staff. The program also takes an active role in maintaining two EOCs.
 
When WEROC was first established in 1983, many individuals from various water agencies generously gave of their time, expertise, patience and enthusiasm. Their foresight in recognizing the need for a comprehensive emergency preparedness program for the Orange County water industry resulted in WEROC's present reputation as a model for other regions to emulate. The continued support  of the client agencies and other coordinating agencies, such as the Metropolitan Water District of Southern California and the Orange County Operational Area, has continued to make the WEROC program successful in its planning and country-wide coordination.
 
Appreciation and thanks is extended to our founding agencies, the Coastal Municipal Water District (CMWD), the Municipal Water District of Orange County (MWDOC), and the Orange County Water District (OCWD), with support and guidance of the Orange County Water Association (OCWA). A great deal of gratitude is also given to WEROC's' funding agencies for their financial support: MWDOC, OCWD, Orange County Sanitation District (OCSD), the South Orange County Wastewater Authority (SOCWA), and the cities of Anaheim, Fullerton, and Santa Ana.
 
The program is supported by a consortium of Orange County water and wastewater agencies(listed below).

 
WEROC Member Agencies 
 
Anaheim
Brea
Buena Park
Costa Mesa Sanitary District
East Orange County Water District
El Toro Water District
Emerald Bay Community Services District
Fountain Valley
Fullerton
Garden Grove
Golden State Water Company
Huntington Beach
Irvine Ranch Water District
La Habra
La Palma
Laguna Beach County Water District
Mesa Water District
Midway City Sanitary District
Moulton Niguel Water District
Municipal Water District of Orange County
Newport Beach
Orange
Orange County Sanitation District
Orange County Water District
San Clemente
San Juan Capistrano
Santa Ana
Santa Margarita Water District
Seal Beach
Serrano Water District
South Coast Water District
South Orange County Wastewater Authority
Trabuco Canyon Water District
Tustin
Westminster
Yorba Linda Water District