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Tribes Approved for Treatment as a State (TAS)

Several federal environmental laws authorize EPA to treat eligible federally recognized Indian tribes as a state (TAS) for the purpose of implementing and managing certain environmental programs and functions, and for grant funding. The charts below identify the federally recognized Indian tribes that have received TAS approvals for specific environmental regulatory programs, administrative functions, and grant programs. Tribes must apply for and receive EPA approval for each specific program or function.

TAS information is updated bi-annually. Most recent update: April 2019.


TAS Approvals to Operate Regulatory Programs

The chart below lists the environmental regulatory programs for which EPA has approved federally recognized tribes for TAS. Environmental regulatory programs are those programs developed and adopted by the tribe for submission to, and approval by, EPA that involve an exercise of regulatory authority by the applicant tribe.

Regulatory Program Number of Authorized Tribes
CAA § 110 - Tribal Implementation Plan (TIP)  6
CAA § 111 - New Source Performance Standards (NSPS)  1
CAA § 112 - National Emissions Standards for Hazardous Air Pollutants (NESHAP) 1
CAA Title V - Operating Permit Program 4
CWA §§ 303(c) / 401 - Water Quality Standards (WQS) Program 60
SDWA § 1413 - Public Water System Supervision (PWSS) Program  1
SDWA § 1425 - Underground Injection Control (UIC) Program, Class II Wells  2
TSCA §§ 402, 404, 406 - Lead Abatement and/or Renovating, Repair, and Painting (RRP) Program 4
Total 79

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TAS Approvals to Operate Regulatory Programs and Perform Administrative Functions - by Tribe

The chart below lists all federally recognized tribes that have received TAS approval for purposes of administering an environmental regulatory program without an enforcement component, an environmental regulatory program with an enforcement component, or an administrative environmental function. Environmental regulatory programs – which may or may not include an enforcement component – are those programs developed and adopted by the tribe for submission to, and approval by, EPA that involve an exercise of regulatory authority by the applicant tribe. Administrative environmental functions do not involve any exercise of regulatory authority by the applicant tribe.

Tribe Regulatory Programs Regulatory Programs with an Enforcement Component Administrative Functions
Arapaho Tribe of the Wind River Reservation, Wyoming (WY)     CAA §§ 107(d)(3); 112(r)(7)(B)(iii); 126; 169B; 176A; 184; 505(a)(2)
Assiniboine and Sioux Tribes of the Fort Peck Indian Reservation, Montana (MT) WQS Program UIC Program  
Bad River Band of the Lake Superior Tribe of Chippewa Indians of the Bad River Reservation, Wisconsin (WI) WQS Program   CAA § 505(a)(2)
Big Pine Paiute Tribe of the Owens Valley (CA) WQS Program    
Bishop Paiute Tribe (CA) WQS Program    
Blackfeet Tribe of the Blackfeet Indian Reservation of Montana (MT)  WQS Program    
Bois Forte Band of the Minnesota Chippewa Tribe (MN)   Lead Abatement and RRP  
Cherokee Nation (OK)   Lead Abatement CAA § 505(a)(2)
Coeur D'Alene Tribe (ID) WQS Program    
Confederated Salish and Kootenai Tribes of the Flathead Reservation (MT) WQS Program    
Confederated Tribes of the Chehalis Reservation (WA) WQS Program    
Confederated Tribes of the Colville Reservation (WA) WQS Program    
Confederated Tribes of the Coos, Lower Umpqua and Siuslaw Indians (OR)     CAA § 505(a)(2)
Confederated Tribes of the Umatilla Reservation (OR) WQS Program   CAA § 505(a)(2)
Confederated Tribes of the Warm Springs Reservation of Oregon (OR) WQS Program    
Dry Creek Rancheria Band of Pomo Indians, California (CA) WQS Program    
Eastern Band of Cherokee Indians (NC) WQS Program    
Eastern Shoshone Tribe of the Wind River Reservation, Wyoming (WY)     CAA §§ 107(d)(3); 112(r)(7)(B)(iii); 126; 169B; 176A; 184; 505(a)(2)
Fond du Lac Band of the Minnesota Chippewa Tribe (MN) WQS Program   CAA § 505(a)(2)
Forest County Potawatomi Community, Wisconsin (WI)     CAA §§ 126; 505(a)(2)
Fort Independence Indian Community of Paiute Indians of the Fort Independence Reservation, California (NV)     CAA § 505(a)(2)
Gila River Indian Community of the Gila River Indian Reservation, Arizona (AZ) WQS Program TIP; NSPS; NESHAP; Operating Permit Program CAA §§ 107(d); 505(a)(2)
Grand Portage Band of the Minnesota Chippewa Tribe (MN) WQS Program   CAA §§ 126; 505(a)(2)
Havasupai Tribe of the Havasupai Reservation, Arizona (AZ) WQS Program (Tribe is not authorized for CWA § 401)     
Hoopa Valley Tribe, California (CA) WQS Program    
Hopi Tribe of Arizona (AZ) WQS Program    
Hualapai Indian Tribe of the Hualapai Indian Reservation, Arizona (AZ) WQS Program    
Kalispel Indian Community of the Kalispel Reservation (WA) WQS Program    
Kaw Nation, Oklahoma (OK)     CAA § 505(a)(2)
Kletsel Dehe Band of Wintun Indians (CA) WQS Program    
La Jolla Band of Luiseno Indians, California (CA)     CAA §§ 126; 505(a)(2)
Lac du Flambeau Band of Lake Superior Chippewa Indians of the Lac du Flambeau Reservation of Wisconsin (WI) WQS Program    
Leech Lake Band of the Minnesota Chippewa Tribe (MN)     CAA § 505(a)(2)
Lone Pine Paiute-Shoshone Tribe (CA)     CAA § 505(a)(2)
Lower Sioux Indian Community in the State of Minnesota (MN)   Lead Abatement  
Lummi Tribe of the Lummi Reservation (WA) WQS Program    
Makah Indian Tribe of the Makah Indian Reservation (WA) WQS Program    
Mashantucket Pequot Indian Tribe (CT)   TIP; Operating Permit Program  
Miccosukee Tribe of Indians (FL) WQS Program    
Mille Lacs Band of the Minnesota Chippewa Tribe (MN)     CAA § 505(a)(2)
Moapa Band of Paiute Indians of the Moapa River Indian Reservation, Nevada (NV)     CAA §§ 107(d)(3); 112(r)(7)(B)(iii); 126; 169B; 176A; 184; 505(a)(2)
Mohegan Tribe of Indians of Connecticut (CT)   TIP  
Morongo Band of Mission Indians, California (CA) WQS Program    
Navajo Nation, Arizona, New Mexico, and Utah (AZ, NM, UT) WQS ProgramOperating Permit Program PWSS Program; UIC Program  
Northern Cheyenne Tribe of the Northern Cheyenne Indian Reservation, Montana (MT) WQS Program    
Ohkay Owingeh, New Mexico (NM) WQS Program    
Pala Band of Mission Indians (CA) WQS Program   CAA § 505(a)(2)
Pawnee Nation of Oklahoma (OK) WQS Program    
Pechanga Band of Luiseno Mission Indians of the Pechanga Reservation, California (CA) TIP (including CAA § 175A)   CAA §§ 107(d); 126; 505(a)(2)
Peoria Tribe of Indians of Oklahoma (OK)     CAA §§ 126; 505(a)(2)
Port Gamble S'Klallam Tribe (WA) WQS Program    
Prairie Band Potawatomi Nation (KS)     CAA § 505(a)(2)
Pueblo of Acoma, New Mexico (NM) WQS Program    
Pueblo of Isleta, New Mexico (NM) WQS Program    
Pueblo of Laguna, New Mexico (NM) WQS Program   CAA § 505(a)(2)
Pueblo of Nambe, New Mexico (NM) WQS Program    
Pueblo of Picuris, New Mexico (NM) WQS Program    
Pueblo of Pojoaque, New Mexico (NM) WQS Program    
Pueblo of Sandia, New Mexico (NM) WQS Program    
Pueblo of Santa Ana, New Mexico (NM) WQS Program    
Pueblo of Santa Clara, New Mexico (NM) WQS Program    
Pueblo of Taos, New Mexico (NM) WQS Program    
Pueblo of Tesuque, New Mexico (NM) WQS Program    
Pueblo of Zia, New Mexico (NM)     CAA §§ 107(d)(3); 126; 505(a)(2)
Puyallup Tribe of the Puyallup Reservation (WA) WQS Program   CAA § 505(a)(2)
Pyramid Lake Paiute Tribe of the Pyramid Lake Reservation, Nevada (NV) WQS Program    
The Quapaw Tribe of Indians (OK)     CAA §§ 107(d)(3); 126; 505(a)(2)
Quinault Indian Nation (WA) WQS Program    
Red Lake Band of Chippewa Indians, Minnesota (MN)     CAA § 505(a)(2)
Rincon Band of Luiseno Mission Indians of the Rincon Reservation, California (CA) WQS Program    
Robinson Rancheria (CA)     CAA § 505(a)(2)
Saint Regis Mohawk Tribe (NY) WQS Program TIP CAA § 505(a)(2)
Salt River Pima-Maricopa Indian Community of the Salt River Reservation, Arizona (AZ)     CAA §§ 106; 107(d); 505(a)(2)
Santee Sioux Nation, Nebraska (NE)     CAA §§ 126; 319; 505(a)(2)
Seminole Tribe of Florida (FL) WQS Program    
Shoshone-Bannock Tribes of the Fort Hall Reservation (ID) WQS Program   CAA §§ 106; 107(c)-(e); 110(a)(2)(D); 126; 505(a)(2)
Sokaogon Chippewa Community, Wisconsin (WI) WQS Program    
Southern Ute Indian Tribe of the Southern Ute Reservation, Colorado (CO) WQS Program Operating Permit Program  
Spokane Tribe of the Spokane Reservation (WA) WQS Program    
Swinomish Indian Tribal Community (WA) WQS Program TIP CAA § 505(a)(2)
Tulalip Tribes of Washington (WA) WQS Program    
Twenty-Nine Palms Band of Mission Indians of California (CA) WQS Program    
Upper Sioux Community, Minnesota (MN)   Lead Abatement  
Ute Mountain Ute Tribe (CO) WQS Program    
Walker River Paiute Tribe of the Walker River Reservation, Nevada (NV) WQS Program    
White Mountain Apache Tribe of the Fort Apache Reservation, Arizona (AZ) WQS Program    
Yurok Tribe of the Yurok Reservation, California (CA)     CAA § 505(a)(2)

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TAS Approvals to Receive Grant Funding

The chart below lists the environmental grant programs for which EPA has approved federally recognized tribes for TAS to receive funding. 

Grant Program Number of Authorized Tribes
CAA § 105 - Air Pollution Planning and Control Grants  49
CWA § 106 - Water Pollution Control Grants 277
CWA § 319 - Nonpoint Source Management Grants 203

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