South Coast Sea Level Rise Risk and Solutions Study

Sea Level Rise Will Impact Our South Coast Communities
The San Mateo County South Coast is known for its iconic beaches, agricultural areas, and small coastal communities. Many of these areas, including coastside beaches and bluffs, roads, agricultural land, businesses and residences are already at risk from flooding and erosion, and these impacts will get worse as sea level continues to rise. Our communities need to know what to expect and what we need to start doing today to protect ourselves from these impacts. The South Coast Sea Level Rise Vulnerability Assessment can help us do just that. This assessment evaluates sea level rise impacts to the South Coast of the county, from the southern edge of Half Moon Bay to the county line south of Pescadero. If you are interested in learning about sea level rise impacts for another area of San Mateo County, please see the 2018 Sea Level Rise Vulnerability Assessment.

Haga clic aquí para ver el video en español.


What Have We Done So Far?
From 2019-2021, the Office of Sustainability (OOS) collaborated with the U.S. Geological Survey and Integral, Inc. to map the areas of the South Coast that will be impacted by erosion and flooding as a result of sea level rise, with the San Mateo County Resource Conservation District (RCD) leading the accompanying public engagement efforts. Sea level rise will happen over time, so it is important to understand how different levels of sea level rise will affect communities. These maps show the impacts of sea level rise right now, at .8 feet, at 1.4 feet and at 4.9 feet.

View the DRAFT MAPS of sea level rise impacts on the South Coast.

View the English Story Map for this project.

Explora nuestro Mapa Historial virtual en español.

What’s Next?
Now that we better understand the specific impacts that sea level rise will have on our South Coast communities, we need to develop solutions to protect communities from worsening flooding and erosion. We can protect communities from sea level rise and other hazards through building protective structures, using nature as a buffer, or moving away from dangerous areas.
People who live and work in the South Coast are invited to share their ideas about the areas of the coast they feel should be prioritized for solutions, specific actions they would like the County to take,
and any other concerns.

Upcoming events and project updates will be posted here.



Virtual Community Meeting on Sea Level Rise and Adaptation in the South Coast | March 9, 2022, 6:00-8:30pm

COASTSIDE LAND TRUST Webinar | September 25, 2021

Click here to view the event recording. Click here to view the event recording. Dr. David Revell shared the County’s findings about the impacts of sea level rise in the South Coast region. Watch to learn what is at risk and ideas for adaptation strategies.


Watch this recording to learn how sea level rise will affect the San Mateo County South Coast. Flooding and erosion from sea level rise have the potential to affect our beaches and bluffs, roads, farms and ranches, businesses and residences.

For questions, please contact us at