
Tribal Environmental Sovereignty in Oklahoma: Where Did It Come from and Where Did It Go?
By Lauren Burden
What does environmental regulation look like for Tribes in Oklahoma today? To answer that question, an understanding of the complicated history of Tribal sovereignty in Oklahoma is essential.
There are three pillars of Tribal sovereignty: (1) inherent sovereignty, (2) delegated sovereignty, and (3) negotiated sovereignty.[1] Negotiated sovereignty comes from treaties and US Supreme Court decisions interpreting those treaties, such as Worcester v. Georgia and Cherokee Nation v. Georgia.[2] Both of these landmark cases confirmed tribal sovereignty by limiting state reach into tribal affairs and officially recognizing tribes as nations.[3] Inherent sovereignty, however, differs from negotiated sovereignty because it is rooted in tribes recognizing themselves as sovereign through self-governance, like they did before colonization.[4] Although tribes still practice inherent sovereignty today[5], tribal governance within reservations and tribal boundaries is often limited, especially regarding non-natives in civil cases.[6] Delegated sovereignty, on the other hand, seems to allow tribes a little more leeway.
Tribes get delegated sovereignty from Congress via the Commerce Clause.[7] The Clause states, “Congress shall have power . . . to regulate commerce with foreign Nations . . . and with the Indian Tribes,”[8] implying Indian Tribes are like foreign Nations. One example of delegated sovereignty in Oklahoma is the Environmental Protection Agency (EPA) delegating to qualifying Tribes the ability to create and manage environmental regulatory programs in Indian country.[9] Specific examples include the Quapaw Tribe of Indians (regulating air quality), the Pawnee Nation of Oklahoma (establishing water quality standards), and the Cherokee Nation (targeting lead abatement).[10] This delegation of sovereign authority, while still technically overseen by the EPA,[11] promotes tribal sovereignty through environmental regulatory self-governance.
Similar to Tribes, Oklahoma also receives authority from the EPA to regulate environmental programs over lands under EPA’s authority (with some oversight, of course).[12] Before McGirt v. Oklahoma, this typically meant tribal lands within Indian country were excluded from state regulation.[13] And since only some Tribes had delegated sovereignty to regulate environmental programs within Indian country, the EPA had environmental authority over most tribal lands before October 2020.[14] This all changed after McGirt.
McGirt v. Oklahoma is another landmark case regarding tribal sovereignty. Specifically, the Supreme Court held in McGirt that the Creek Nation’s reservation remained intact and that only Congress could disestablish it (which it had not).[15] After this ruling, Oklahoma State courts confirmed that other tribal reservations also remained intact.[16] While one would think this is great news for Tribal Nations in Oklahoma, there is a catch. The catch, also known as the “Safe, Accountable, Flexible, Efficient Transportation Equity Act: A Legacy for Users” (“SAFETEA Act”), is an appropriations bill for transit programs and highway safety.[17] This unsuspecting bill has a provision, known as the midnight rider, that keeps tribes in Oklahoma from regulating their own environmental programs without making a deal with the State first.[18] And the State has used this to its advantage.
After McGirt, the State applied for EPA approval under the SAFETEA Act to regulate environmental programs over lands that were previously State regulated but are now considered Indian country.[19] Under the midnight rider, once the State requests this authority, the Administrator (here, the EPA) must grant approval.[20] The EPA approved it in October 2020.[21] But that’s not the end of this story.
In January 2021, President Biden issued an executive order requiring agencies to review the last four years’ actions and regulations to see if they conflict with any national objectives.[22] After review and consultation with Tribes,[23] EPA issued notice of a proposal to withdraw and reconsider its 2020 decision.[24] In January 2025, the EPA withdrew its 2020 decision and replaced it with the new 2025 decision, detailing its decision in a letter to Oklahoma’s Governor Stitt.[25] This new decision conditions state environmental regulatory approval on Tribal consultation through a specific engagement process,[26] and highly encourages individual State-Tribal agreements to better promote tribal sovereignty.[27] While Governor Stitt considers this an overreach of power,[28] tribal nations are ready to work with the State in protecting their valuable natural resources.[29]
Now we’ve seen where tribal environmental sovereignty in Oklahoma comes from and where it has been, but where will it go from here? That’s a question that only the State and the Tribes can answer. I just hope it’s someplace great.
[1] Lily Yazzie-Begay, What is Tribal Sovereignty?, Native Am. Today (July 13, 2025), https://nativeamericanstoday.com/what-is-tribal-sovereignty/.
[2] Worcester v. Georgia, 31 U.S. 515 (1832); Cherokee Nation v. Georgia, 30 U.S. 1 (1831).
[3] Id.
[4] Id.; See also Kimberley Chen, Comment, Toward Tribal Sovereignty: Environmental Regulation in Oklahoma After McGirt, 121 Colum. L. Rev. Forum (2021).
[5] Yazzie-Begay, supra note 1.
[6] Chen, supra note 4.
[7] Id.
[8] U.S. Const. art. I, § 8, cl. 3
[9] Tribes Approved for Treatment as a State (TAS), EPA (July 3, 2025), https://www.epa.gov/tribal/tribes-approved-treatment-state-tas.
[10] Id.
[11]Letter from EPA, Off. of the Adm’r, to Kevin Stitt, Gov. of Okla., at 2 (Jan. 13, 2025) (online file with Oklahoma.gov).
[12] Id.
[13] Id.
[14] Id. at 3
[15] McGirt v. Oklahoma, 591 U.S. 894, 894-895 (2020).
[16] Letter from EPA, supra note 11, at 3.
[17] Safe, Accountable, Flexible, Efficient Transportation Equity Act: A Legacy for Users, Pub. L. No. 109-59, 119 Stat. 1144 (2005).
[18] Raymond Nolan, The Midnight Rider: The EPA and Tribal Self-Determination, 42 Am. Indian 329, 329 (2018).
[19] Letter from EPA, supra note 11, at 4.
[20] Id.; see also Safe, Accountable, Flexible, Efficient Transportation Equity Act: A Legacy for Users § 10211.
[21] Letter from EPA, supra note 11, at 5.
[22] Id.; see also Executive Order on Protecting Public Health and the Environment and Restoring Science to Tackle the Climate Crisis, 86 Fed. Reg. 7037 (Jan. 25, 2021).
[23] Letter from EPA, supra note 11, at 5.
[24] Proposed Withdrawal and Reconsideration and Supporting Information, EPA (June 9, 2025) https://www.epa.gov/ok/proposed-withdrawal-and-reconsideration-and-supporting-information.
[25] Letter from EPA, supra note 11, at 6.
[26] Id. at 11.
[27] Id. at 14
[28] Governor Kevin Stitt Condemns EPA’s Last Minute Overreach, Oklahoma.gov (Jan. 16, 2025), https://oklahoma.gov/governor/newsroom/newsroom/2025/governor-kevin-stitt-condemns-epa-s-last-minute-overreach.html.
[29] EPA Directs Oklahoma to Coordinate with Tribes on Protecting Air, Water and Public Health, Pawnee Nation (Jan. 28, 2025), https://pawneenation.org/epa-directs-oklahoma-to-coordinate-with-tribes-on-protecting-air-water-and-public-health/.




