Orange County Reservoir, located in Brea, California, serves as a critical water supply source for the region. Completed in 1941, this earth dam stands at a height of 103 feet and has a storage capacity of 217 acre-feet. The reservoir is regulated and inspected by the California Department of Water Resources (DWR) for safety compliance, with a satisfactory condition assessment as of September 2017.

With a high hazard potential, Orange County Reservoir plays a vital role in water management and flood control along the Tr Fullerton Creek. The dam's primary purpose is water supply, offering a reliable resource for the surrounding community. Despite its age, the structure has undergone regular inspections, with the most recent one conducted in August 2020 to ensure the reservoir's continued safety and functionality.

Managed by a public utility agency, Orange County Reservoir exemplifies the importance of effective water resource management in the face of climate change and increasing water demands. As a key infrastructure for the region, this reservoir highlights the need for ongoing monitoring, maintenance, and risk assessment to safeguard against potential hazards and ensure the sustainable use of water resources in Orange County.