A 1984 landmark Supreme Court ruling empowering federal agencies to interpret statutes when there is uncertainty is being challenged. The outcome will impact federal regulatory authority throughout government, particularly environmental protection.

Update:
“Chevron is overruled. Courts must exercise their independent judgment in deciding whether an agency has acted within its statutory authority,” Chief Justice John Roberts wrote for the majority.
A central part of any president’s strategy for reining in greenhouse gas emissions has a big problem in a post-Chevron Washington: The regulators draw their authority from a law that Congress hasn’t significantly updated in 34 years — well before most lawmakers were even thinking about the dangers of climate change.
A rather arcane case brought by Chevron USA against the National Resources Defense Council involving the Clean Air Act was decided by the U.S. Supreme Court in 1984, establishing the principle that “courts will give the [government] agency deference in ambiguous situations as long as its interpretation is reasonable,” according to Justia, a legal information website.
Chevron is likely the most frequently cited case in American administrative law and is the origin of the term “Chevron deference.”
That principle, long targeted by conservative groups, “lies at the heart of two cases the court heard this term: Loper Bright Enterprises v. Raimondo and Relentless v. Department of Commerce,” reports Andrew Welch for Barron's on June 27. “Both cases involve fishing boat operators who challenged the constitutionality of federal government regulations intended to protect Atlantic herring fisheries.”
During oral arguments in January, some conservative justices expressed skepticism about it, suggesting the court could overturn or curtail it.
Cataclysmic?
“Groups on both sides of the doctrine tend to talk about the case in cataclysmic terms because of the ways it could ripple through American law — changing the balance between those fighting government agencies, the agencies themselves and the courts overseeing the disputes,” reported Michael Macagnone for Roll Call on Jan. 26, 2024, the day before oral arguments were heard.
Macagnone wrote on May 1, 2023, after the Supreme Court agreed to review the case, that the outcome “could change the balance of power between executive agencies, Congress and the judiciary.”
“If the court decides to trim it back or fully overrule it, judges will be able to substitute their own interpretation of the law in more cases, and may be more likely to strike down existing agency rules,” reports Rachel Frazin, who covers energy and environment policy for The Hill, on June 25.
“[I]f the court gets rid of the doctrine, then we have a lot of questions about what kind of litigation will ensue, and I predict that a lot of particularly industry groups may bring challenges against environmental health and safety regulations that have been upheld under Chevron,” said Emily Hammond, [an expert in energy law, environmental law, and administrative law] at George Washington University.
The decision could come as early as Friday, June 28, or early next week.
A Planetizen news post last August, “Federal Fuel Economy Rules Take Different Path than Emission Standards,” referenced the Chevron deference principle, along with a 2022 landmark case involving federal regulations, W.Va. vs. EPA, which overturned the former President Obama's clean power plan rule.

Planetizen Federal Action Tracker
A weekly monitor of how Trump’s orders and actions are impacting planners and planning in America.

Congressman Proposes Bill to Rename DC Metro “Trump Train”
The Make Autorail Great Again Act would withhold federal funding to the system until the Washington Metropolitan Area Transit Authority (WMATA), rebrands as the Washington Metropolitan Authority for Greater Access (WMAGA).

The Simple Legislative Tool Transforming Vacant Downtowns
In California, Michigan and Georgia, an easy win is bringing dollars — and delight — back to city centers.

Albuquerque’s Microtransit: A Planner’s Answer to Food Access Gaps
New microtransit vans in Albuquerque aim to close food access gaps by linking low-income areas to grocery stores, cutting travel times by 30 percent and offering planners a scalable model for equity-focused transit.

This City Will Pay You to Meet Your Neighbors
A North Kansas City grant program offers up to $400 for residents to throw neighborhood block parties.

Commentary: Our Silence Will Not Protect Us
Keeping our heads down and our language inoffensive is not the right response to the times we’re in. Solidarity and courage is.
Urban Design for Planners 1: Software Tools
This six-course series explores essential urban design concepts using open source software and equips planners with the tools they need to participate fully in the urban design process.
Planning for Universal Design
Learn the tools for implementing Universal Design in planning regulations.
Smith Gee Studio
City of Charlotte
City of Camden Redevelopment Agency
City of Astoria
Transportation Research & Education Center (TREC) at Portland State University
US High Speed Rail Association
City of Camden Redevelopment Agency
Municipality of Princeton (NJ)
