Health and Environmental Groups Sue EPA Over Mercury Standards Rollback

On March 30, 2026, a coalition of health and environmental organizations, including Earthjustice, the American Lung Association, the Natural Resources Defense Council, and the American Academy of Pediatrics, filed a lawsuit against the U.S. Environmental Protection Agency (EPA) in the D.C. Circuit Court. The lawsuit contests the Trump administration's repeal of the Mercury and Air Toxics Standards (MATS), which had significantly reduced mercury and other hazardous air pollutants from coal-fired power plants since their implementation in 2015.

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The Trump administration's EPA repealed the 2024 update of MATS, which aimed to cut allowable mercury pollution from coal plants by 70% and reduce emissions of other toxic metals by two-thirds. This rollback is projected to reverse public health gains, potentially leading to increased asthma attacks, emergency room visits, and premature deaths. The coalition argues that the repeal undermines the EPA's core mission to protect public health and welfare.

EarthJusticeUsNews and World ReportEPA Mercury Rules Rollback Revives Fish Contamination ConcernsCalifornia Lawsuit Challenges Radical Overhaul of EPA Rules

The rollback of MATS has raised concerns among scientists and regulators regarding potential increases in toxic contamination in U.S. fish, reversing decades of progress in public health. Experts indicate that nearly all mercury found in fish consumed by Americans originates from coal-fired power plants. The removal of continuous emissions monitoring requirements is particularly alarming, as it eliminates real-time data on mercury releases, complicating compliance enforcement and public awareness of pollution levels.

EPA Mercury Rules Rollback Revives Fish Contamination ConcernsEarthJusticeUsNews and World ReportCalifornia Lawsuit Challenges Radical Overhaul of EPA Rules

Gabriel Filippelli, a biogeochemist at Indiana University, emphasized that even minor increases in emissions can lead to significant changes in fish tissue contamination over time. The health risks associated with methylmercury, a toxic form of mercury, include cardiovascular disease in adults and developmental issues in infants.

EPA Mercury Rules Rollback Revives Fish Contamination Concerns

The coalition's lawsuit highlights the serious implications of the EPA's actions. They stated, “This administration is not just rolling back rules; it is eliminating the monitoring infrastructure needed to know what is coming out of these smokestacks in the first place.” They further noted that the rollback could keep vulnerable communities unaware of the pollution threats they face.

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California Governor Gavin Newsom also criticized the Trump administration's actions, asserting that the repeal of the Endangerment Finding, which recognizes the dangers of greenhouse gases, constitutes a breach of legal responsibility. He stated, “No one is above the law in this country. Not even the president. We’ll fight this lawlessness in court.”

California Lawsuit Challenges Radical Overhaul of EPA Rules

Critics argue that the EPA's rollback prioritizes the interests of the coal industry over public health. The lawsuit points out that 93% of U.S. coal capacity had already met or was on track to meet the standards prior to the repeal. The coalition contends that the rollback will lead to increased emissions of sulfur dioxide and mercury, which have already risen by 18% and 9%, respectively, since the exemptions were granted.

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While the coalition claims that the rollback will have dire public health consequences, the Trump administration has not provided a comprehensive assessment of the potential impacts of these changes. The lack of continuous monitoring and the subsequent rise in emissions raise questions about the adequacy of existing regulatory frameworks to protect public health and the environment.

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• “This administration is not just rolling back rules, it is eliminating the monitoring infrastructure needed to know what is coming out of these smokestacks in the first place.” — Coalition of health and environmental groups

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• “Donald Trump is breaking the laws that protect Americans from climate pollution — all to enrich his Big Oil and his wealthy polluting allies. Workers, families, and communities would pay the price, left choking on dirty air. No one is above the law in this country. Not even the president. We’ll fight this lawlessness in court,” — Governor Gavin Newsom

California Lawsuit Challenges Radical Overhaul of EPA Rules

The outcome of this lawsuit could have significant implications for environmental regulations and public health protections in the United States.

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