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Maryland Plan to Adapt to Saltwater Intrusion and Salinization
December 2024
Maryland’s Plan to Adapt to Saltwater Intrusion and Salinization, first published in 2019 and updated in 2024, provides recommendations for state-level action to better understand the impacts of increasing saltwater intrusion and salinization on different resources and to adapt to these impacts. Saltwater intrusion in the region is expected to worsen over time due to climate change, and the report describes which of the state’s resources are at greatest risk, adaptation measures that are currently in use and recommended, and what additional research is needed for adequate adaptation and resilience.
Related Organizations: Maryland Department of Planning
Resource Category: Planning
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San Francisco Bay Conservation and Development Commission Regional Shoreline Adaptation Plan
December 2024
After Senate Bill 272 (Sea level rise: planning and adaptation) was adopted in late 2023, the state of California now requires that local governments along the shoreline adjudicated by the San Francisco Bay Conservation and Development Commission (BCDC) create sea-level rise plans by 2034. The BCDC Regional Shoreline Adaptation Plan (RSAP) provides local governments guidance on how to draft, implement, and update “Subregional Plans,” which must be approved by BCDC.
Related Organizations: San Francisco Bay Conservation and Development Commission (BCDC)
Resource Category: Planning
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California Coastal Commission Sea Level Rise Policy Adopted Guidance
November 13, 2024
The California Coastal Commission’s Adopted Sea Level Rise Policy Guidance offers an overview of the best available science on sea-level rise for California, coastal adaptation strategies, and recommended methodology for addressing sea-level rise in Coastal Commission planning and regulatory actions. The Sea Level Rise Policy Guidance was first released in 2015, amended with a Science Update in 2018, and amended again with an update in 2024. The new update reflects the best available science on sea-level rise, implements new legislation in the form of Senate Bill 272 (2023), and integrates environmental justice principles.
Related Organizations: California Coastal Commission
Resource Category: Law and Governance
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U.S. Sea Level Change Website
September 23, 2024
The U.S. Sea Level Change website, published in September 2024, is a multi-agency effort to provide accessible, authoritative sea-level science and education at the state, regional, and national levels. The website includes a sea-level change data explorer that illustrates past, present, and future sea level trends and impacts, including flooding. The site also hosts a comprehensive “Sea Level 101” guide that explains how sea level is defined, measured, and modeled, as well as personal impacts and actions.
Related Organizations: Federal Emergency Management Agency (FEMA), National Oceanic and Atmospheric Administration (NOAA), National Aeronautics and Space Administration (NASA), U.S. Geological Survey (USGS), U.S. Department of Homeland Security (DHS), U.S. Environmental Protection Agency (EPA), U.S. Department of Defense (DoD), U.S. Global Change Research Program (USGCRP), U.S. Army Corps of Engineers (USACE)
Resource Category: Data and tools
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California Senate Bill No. 272: Sea Level Rise Planning and Adaptation
October 9, 2023
Senate Bill 272, Sea Level Rise: Planning and Adaptation, was approved by California Governor Newsom on October 7, 2023 and requires local governments in coastal zones in California to develop a sea level rise plan. The local sea level rise plans are to be integrated with other local or regional planning efforts overseen by either the California Coastal Commission or the San Francisco Bay Conservation and Development Commission (BCDC), depending on where in the state the local government is located.
Related Organizations: State of California
Resource Category: Law and Governance
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South San Francisco Zoning Code - Flood Plain / Sea-Level Rise Overlay
October 2022
In October 2022, the South San Francisco, CA City Council, updated its zoning code to incorporate a Flood Plain/Sea Level Rise (SLR) overlay district intended to “mitigate the impacts of sea level rise, and protect the health, safety, and welfare of residents of [South San Francisco]. ” The additional purposes of the overlay district are to “limit the potential impact of coastal flooding and erosion patterns on coastal development,” adapt to climate change, create adaptation strategies with a priority on long-term resilience, “establish standards consistent with the San Mateo County Flood and Sea Level Rise Resiliency District,” introduce “flood-proof” construction to South San Francisco, and restore creek ecologies to build resilience.
Related Organizations: City of South San Francisco, California
Resource Category: Law and Governance
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Overview of Selected Parishes’ Freeboard, Fill, and Open Space Rules and Projects within Louisiana’s Region Seven Watershed
May 18, 2022
As coastal erosion and the threat of major hurricanes and other flooding events continue to threaten Louisiana, parishes have begun to adopt jurisdiction-specific approaches to mitigating those risks. The establishment of freeboard requirements, no-net fill practices, and the incorporation of green stormwater infrastructure (GSI), such as open spaces and native vegetation, are three major ways to prepare for and mitigate flooding. This brief entry provides a non-exhaustive overview of some of the ways five Louisiana parishes are using these approaches: Ascension, St. Bernard, St. John the Baptist, St. Tammany, and Tangipahoa.
Resource Category: Law and Governance
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Burlingame Municipal Code Title 25 - Public Access, Flood, and Sea Level Rise Performance Guidelines
December 6, 2021
In December 2021, the City of Burlingame, California, passed Title 25 into its zoning ordinance, creating guidelines and development performance standards for ensuring public access and resilience to flooding and sea-level rise. These standards include minimum buffer zones, shoreline building and infrastructure elevation requirements, drainage standards, and real estate disclosure requirements.
Related Organizations: City of Burlingame, California
Resource Category: Law and Governance
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Critical Infrastructure at Risk: Sea Level Rise Planning Guidance for California’s Coastal Zone
August 2021
In August 2021, the California Coastal Commission (CCC), one of California’s three coastal management agencies, issued the Critical Infrastructure at Risk: Sea Level Rise Planning Guidance for California’s Coastal Zone. The guidance serves as an advisory document for the state and local governments, asset managers, and stakeholders in California to update plans and policies for critical transportation and water infrastructure to adapt to sea-level rise and flooding. The guidance is based on different studies held to be the best available science on sea-level rise in California, which includes a projection of a 6-10 feet of sea-level rise by 2100.
Related Organizations: California Coastal Commission
Resource Category: Planning
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Hawaii Act 179 (Senate Bill 474): Relating to Real Property Transactions
July 2, 2021
On July 2, 2021, Hawaii Governor David Ige signed into law Act 179 (Senate Bill 474), which requires that sellers of real estate located in areas at risk of sea-level rise disclose this information to potential buyers (Haw. Rev. Stat. § 508D-15 (2021)). Policymakers passed the law to ensure that prospective buyers are aware of future risks to property related to sea-level rise.
Related Organizations: State of Hawaii, Hawaii Climate Change Mitigation and Adaptation Commission
Resource Category: Law and Governance
