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: July 2025.
- TAS Approvals to Operate Regulatory Programs - Totals
- TAS Approvals to Operate Regulatory Programs and Perform Administrative Functions - by Tribe
- TAS Approvals to Receive Grant Funding
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) | 8 |
| CAA § 111 - New Source Performance Standards (NSPS) | 2 |
| CAA § 112 - National Emissions Standards for Hazardous Air Pollutants (NESHAP) | 2 |
| CAA Title V - Operating Permit Program | 4 |
| CWA §§ 303(c) / 401 - Water Quality Standards (WQS) Program | 85 |
| 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 number of regulatory program approvals | 108 |
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 |
|---|---|---|---|
| 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 | ||
| Cabazon Band of Mission Indians, California (CA) | WQS Program | ||
| Chemehuevi Indian Tribe of the Chemehuevi Reservation, California (CA) | WQS Program | ||
| 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) | WQS Program | CAA § 505(a)(2) | |
| Confederated Tribes of the Goshute Reservation, Nevada and Utah (NV, UT) | WQS Program | ||
| 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 | ||
| Jamestown S'Klallam Tribe | WQS Program | ||
| Kalispel Indian Community of the Kalispel Reservation (WA) | WQS Program | CAA §§ 110(a)(2)(D); 126; 169B; 176A; 505(a)(2) | |
| Karuk Tribe (CA) | WQS Program | ||
| Kaw Nation, Oklahoma (OK) | CAA § 505(a)(2) | ||
| Keweenaw Bay Indian Community, Michigan (MI) | WQS Program | CAA § 505(a)(2) | |
| Kletsel Dehe Band of Wintun Indians (CA) | WQS Program | ||
| La Jolla Band of Luiseno Indians, California (CA) | WQS Program | CAA §§ 126; 505(a)(2) | |
| La Posta Band of Diegueno Mission Indians (CA) | WQS Program | CAA §§ 107(d); 126(a); 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) | WQS Program | 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) | ||
| Mississippi Band of Choctaw Indians (MS) | CAA §§ 107(c),(d); 110(a)(2)(d)(i); 126(a),(b); 319; 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 | TIP | CAA §§ 107; 126(a)-(b); 172; 319; 505(a) |
| Navajo Nation, Arizona, New Mexico, and Utah (AZ, NM, UT) | WQS Program; Operating Permit Program | PWSS Program; UIC Program | |
| Northern 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) | ||
| Northern Cheyenne Tribe of the Northern Cheyenne Indian Reservation, Montana (MT) | WQS Program | TIP | CAA §§ 126; 505(a)(2) |
| Northwestern Band of the Shoshone Nation (UT) | CAA §§ 107(d)(3); 112 (r)(7)(B)(iii); 126; 169B; 176A; 184; 505(a)(2) | ||
| 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 §§ 107(d)(3); 126; 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 San Felipe, New Mexico (NM) | WQS Program | ||
| Pueblo of Santa Ana, New Mexico (NM) | WQS Program | CAA §§ 107(d)(3); 126; 505(a)(2) | |
| 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) | ||
| Quartz Valley Indian Community of the Quartz Valley Reservation of California (CA) | WQS Program | ||
| Quinault Indian Nation (WA) | WQS Program | ||
| Red Lake Band of Chippewa Indians, Minnesota (MN) | WQS Program | CAA § 505(a)(2) | |
| Resighini Rancheria, California (CA) | WQS Program | ||
| Rincon Band of Luiseno Mission Indians of the Rincon Reservation, California (CA) | WQS Program | ||
| Robinson Rancheria (CA) | CAA § 505(a)(2) | ||
| Sac and Fox Tribe of the Mississippi in Iowa (IA) | WQS Program | ||
| 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) | WQS Program | CAA §§ 106; 107(d); 505(a)(2) | |
| San Carlos Apache Tribe of the San Carlos Reservation, Arizona (AZ) | WQS Program | ||
| Santee Sioux Nation, Nebraska (NE) | CAA §§ 126; 319; 505(a)(2) | ||
| Seminole Tribe of Florida (FL) | WQS Program | ||
| Seneca Nation of Indians (NY) | 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) | |
| Shoshone-Paiute Tribes of the Duck Valley Reservation, Nevada (NV, ID) | WQS Program | ||
| Sokaogon Chippewa Community, Wisconsin (WI) | WQS Program | ||
| Southern Ute Indian Tribe of the Southern Ute Reservation, Colorado (CO) | WQS Program | NSPS; NESHAP; Operating Permit Program | |
| Spokane Tribe of the Spokane Reservation (WA) | WQS Program | ||
| Squaxin Island Tribe of the Squaxin Island Reservation (WA) | WQS Program | ||
| Summit Lake Paiute Tribe of Nevada (NV) | WQS Program | ||
| Swinomish Indian Tribal Community (WA) | WQS Program | TIP | CAA § 505(a)(2) |
| Table Mountain Rancheria (CA) | WQS Program | ||
| 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 | ||
| Winnebago Tribe of Nebraska (NE) | WQS Program | ||
| Yerington Paiute Tribe of the Yerington Colony & Campbell Ranch, Nevada (NV) | WQS Program | ||
| Yurok Tribe of the Yurok Reservation, California (CA) | WQS Program | CAA § 505(a)(2) |
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 | 56 |
| CWA § 106 - Water Pollution Control Grants | 290 |
| CWA § 319 - Nonpoint Source Management Grants | 217 |