How Can a Species Be Delisted Under the ESA?

A species is removed from the federal endangered or threatened list through a formal rulemaking process under Section 4 of the Endangered Species Act. To understand how a species can be delisted under the ESA, start with the legal test: the U.S. Fish and Wildlife Service or NOAA Fisheries must find, using the best available scientific and commercial data, that one of four things is true about the species, then publish a proposed rule, take public comment, and issue a final decision. The process can be started by the agency itself during a mandatory five-year review, or by a petition from any member of the public.¹

USFWS handles land and freshwater species. NOAA Fisheries handles marine and anadromous species, including whales, corals, sea turtles, and salmon.² Whichever agency has primary jurisdiction leads the delisting, and both follow the same statutory procedures.

The Four Legal Grounds for Delisting

Federal regulations set out four circumstances that justify removing a species from the list.³ The agency must determine that one of the following is true:

The species has recovered enough that it no longer meets the definition of endangered or threatened.
The species is extinct.
New information shows the species was never actually endangered or threatened when it was listed.
New information shows the listed entity was never a valid species, subspecies, or distinct population segment eligible for ESA protection.

Recovery is the outcome the statute is designed to produce, and it accounts for most delistings. The bald eagle, delisted in 2007, is the best-known example. The last two grounds often overlap: both involve science correcting an earlier record. NOAA Fisheries delisted the coral Siderastrea glynni in 2021 after genetic analysis showed it was not a distinct species.⁴

The Five-Factor Threat Analysis

Whichever ground applies, the agency’s decision runs through the same five threat factors used to list the species in the first place. The statute asks whether the species is endangered or threatened because of:¹

Destruction, modification, or curtailment of its habitat or range.
Overuse for commercial, recreational, scientific, or educational purposes.
Disease or predation.
Inadequacy of existing regulatory mechanisms.
Other natural or human-caused factors affecting its continued existence.

For a recovery-based delisting, the agency has to find that threats across all five categories have been eliminated or reduced enough that the species can sustain itself without ESA protections.⁵ Many proposals stall on the fourth factor. Even a species with a rebounded population cannot be delisted if the laws and management programs meant to protect it going forward are too weak to prevent a future decline.

Recovery plans usually set concrete benchmarks such as minimum populations or habitat targets, but meeting those benchmarks is not the legal test.⁶ The five-factor analysis controls. A species that exceeds its recovery targets can stay listed if a new threat has emerged. One that hasn’t hit every benchmark can still be delisted if the threats are under control.

How the Process Starts

Delisting begins in one of two ways.

The Mandatory Five-Year Review

The ESA requires each agency to review every listed species at least once every five years to see whether its status should change.⁷ The review looks at current population data, habitat conditions, conservation efforts, and the status of known threats. If it concludes the species has recovered or otherwise no longer qualifies, the agency moves to rulemaking.

Citizen Petitions

Any person can petition USFWS or NOAA Fisheries to delist a species. The petition has to present substantial scientific or commercial information indicating that delisting may be warranted.⁸ Within 90 days of receiving the petition, the agency must publish a finding in the Federal Register stating whether the petition presents enough evidence to justify a full status review. If yes, that review starts promptly. The rulemaking that follows is the same either way.

The Rulemaking Timeline

Once the agency concludes a species qualifies for delisting, Section 4(b)(5) sets the procedure and the clock.

The agency publishes a proposed rule in the Federal Register with the full regulatory text and the scientific justification. That notice must appear at least 90 days before the rule could take effect. The agency also notifies every state, county, and equivalent jurisdiction where the species occurs, along with relevant scientific organizations.¹ Anyone can request a public hearing within 45 days of publication, and the agency must hold one if asked.

After the comment period closes, the agency reviews substantive comments and incorporates new data. Within one year of publishing the proposed rule, it must do one of four things: publish a final rule, withdraw the proposal if the evidence is insufficient, extend the deadline by up to six months if there is substantial disagreement about the data, or publish a notice explaining the extension. A withdrawn proposal cannot be resubmitted unless the agency obtains significant new information.

Downlisting as a Middle Step

Not every species moves straight from endangered to delisted. Reclassifying a species from endangered to threatened, known as downlisting, uses the same rulemaking procedures and the same five-factor analysis. Threatened species still receive ESA protections, but the agency has more room to tailor those protections through special rules. Downlisting lets the agency acknowledge real progress while keeping oversight in place for a species that hasn’t fully recovered.

What Happens After a Species Is Delisted

Delisting removes the core ESA protections. Federal agencies no longer have to consult with USFWS or NOAA Fisheries before approving projects that could affect the species or its habitat. The Section 9 prohibition on “take” (killing, harming, or harassing the species) is lifted. Critical habitat designations lose their regulatory effect.

Other laws may still apply. The bald eagle remains protected by the Bald and Golden Eagle Protection Act and the Migratory Bird Treaty Act. State wildlife laws often provide independent protections as well. But the strongest federal tool for restricting development, logging, water projects, and similar activities is gone once ESA coverage ends.

Five Years of Post-Delisting Monitoring

When a species is delisted because of recovery, the ESA requires the agency to monitor it for at least five years. This requirement, added under Section 4(g) in 1988, is meant to catch backsliding early.⁹ The monitoring plan is typically drafted alongside the delisting proposal and carried out in partnership with the state agencies that take over day-to-day management. A short-lived species with a fast reproductive cycle may need only basic population surveys; a long-lived species may warrant more intensive tracking, and monitoring can extend past five years when the biology or the threats call for it.

If monitoring shows a significant decline or a resurgence of threats, Section 4(g) directs the agency to make prompt use of its emergency listing authority, which reinstates endangered or threatened status for up to 240 days while a full review proceeds. The agency can also reinstate protections through the regular listing process.

Species delisted because they are extinct or because of taxonomic or data error are not subject to the five-year monitoring requirement. That obligation applies only to recovered species.

Challenging a Delisting in Court

Delisting decisions can be challenged in federal court under the Administrative Procedure Act. Environmental groups, landowners, state governments, and other affected parties can sue if they believe the agency relied on flawed science, ignored relevant data, or failed to follow required procedures. Courts review these challenges under the arbitrary-and-capricious standard, asking whether the agency’s decision was reasonable given the record. The general statute of limitations for such a claim against the federal government is six years. Contested delistings of high-profile species, including the gray wolf, have been reversed and sent back to the agency more than once.

1
Office of the Law Revision Counsel. 16 USC 1533 – Determination of Endangered Species and Threatened Species
2
NOAA Fisheries. Endangered Species Act Implementation
3
eCFR. 50 CFR 424.11 – Factors for Listing, Delisting, or Reclassifying Species
4
NOAA Fisheries. Delisting Species Under the Endangered Species Act
5
NOAA Fisheries. Listing Species Under the Endangered Species Act
6
U.S. Fish & Wildlife Service. Delisting a Species Fact Sheet
7
U.S. Fish & Wildlife Service. Five-Year Status Reviews
8
U.S. Fish & Wildlife Service. Section 4 – Determination of Endangered Species and Threatened Species
9
U.S. Fish and Wildlife Service. Post-Delisting Monitoring Plan Guidance