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The San Mateo County Flood and Sea Level Rise Resiliency District, also known as OneShoreline, is an independent government agency that works across jurisdictional boundaries to secure and leverage public and private resources for the long-term resilience of our region. We plan and build solutions to mitigate the climate change impacts of sea level rise, flooding, and coastal erosion, as well as to enhance the environment, recreational opportunities, and quality of life within communities throughout the county.