The Central Orange County (COC) Watershed Management Area (WMA) encompasses the Newport Bay Watershed with an area of approximately 154 square miles. Cities within the WMA include Irvine, Newport Beach, Tustin, and portions of Costa Mesa, Laguna Hills, Laguna Woods, Lake Forest, Orange, and Santa Ana. San Diego Creek and Santa Ana-Delhi Channel are the major inputs into the Newport Bay Watershed. The COC WMA includes three Critical Coastal Areas (CCAs), two Areas of Special Biological Significance(ASBS), nine miles of coastline, and a functioning estuary designated as a State Ecological Reserve. The entire area within the WMA drains to the CCAs and ASBS, which means conditions in the WMA significantly impact the coastal ecosystem. Water supplies are diverse including groundwater, desalted groundwater, recycled water, and imported water.
Integrated Regional Watershed Management Plan (IRWMP) Efforts
Making Orange County a safe, healthy, and fulfilling place to live, work, and play, today and for generations to come, by providing outstanding, cost-effective regional public services.
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