Wetlands are some of Earth’s most vital ecosystems. They clean our water, support recreational industries and are home to 40% of the world’s species and 75% of commercially harvested fish and shellfish species in the United States. Moreover, wetlands are pivotal in protecting communities from flooding, our nation’s costliest natural hazard, because they act as natural sponges that slow and absorb floodwaters, reducing downstream flood damages. With one acre of wetlands storing as much as 1.5 million gallons of flood water, continued loss of wetlands and development in high-risk areas will exacerbate the impacts of increasing climate-driven storms and put more communities at risk of flooding.

Wetlands are at serious risk. What’s happening?

The U.S. government once recognized that wetlands connected to federal waterways, including those connected below the surface, should be protected under the Clean Water Act. But in 2023, a majority opinion by the Supreme Court drastically scaled back those federal protections in an opinion now stating that wetlands must have “a continuous surface connection” to federal waters. This language is not grounded in science and establishes tremendous uncertainty as to how this will be interpreted in the long term. 

An analysis from EDF estimates that between 17-90 million acres of wetlands could now be threatened (for reference, California is 100 million acres in size). The Supreme Court’s decision is compounded by the fact that many states have few or no state protections, with 24 states currently relying entirely on the federal wetlands protections determined by the Clean Water Act. In short, this means many of these wetlands may have no protection at all.

Tools to assess wetlands at risk

  • Sunrise over wetlands

    How many wetlands are at risk?

    EDF’s peer-reviewed analysis of wetlands at risk of losing federal protections following the 2023 Supreme Court decision. Click to view potential scenarios for wetlands at risk.

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  • Aerial view of Louisiana wetlands

    Track on-the-ground wetlands protections

    The EPA and U.S. Army Corps of Engineers publishes a dataset of agency decisions for what is considered a “Water of the U.S.” and therefore protected under the Clean Water Act. Click to compare EDF’s analysis of agency decisions before and after the Supreme Court decision.

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How EDF is working to protect wetlands

EDF is working together with scientists, advocates and policymakers to better quantify, communicate and protect the breadth and value of benefits that wetlands provide, including their flood risk reduction benefits. This will require cutting-edge advancements in science and economics, as well as partnerships across a wide spectrum of stakeholders and policy action. We’re also creating a better public understanding of the benefits that wetlands provide, including water and flood management.

Staff perspective

EDF is committed to building resilience against increasing climate impacts. There is an urgent need to strengthen federal, state and local wetland protections to protect our communities from flooding, keep our waters clean, safeguard vital habitat and support our economies.

Will McDow

Associate Vice President, Climate Resilient Coasts & Watersheds, EDF