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AI_RESERVATIONS_Template_ExportFeatures
002
Geographic
GCS_North_American_1983
Angular Unit: Degree (0.017453)
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20250214
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20260602
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ISO19115_3
Esri ArcGIS 13.4.0.55405
EPA Tribes (3 of 6): American Indian Reservations
2026-05-28
2026-05-28
Steve Lennartz
EPA Office of Finance and Administration
Deputy Geospatial Information Officer
109 T.W. Alexander Drive
RTP
NC
27711
lennartz.steve@epa.gov
(919) 541-1058
EPA Place Names
2015-01-31
https://ofmpub.epa.gov/sor_internet/registry/termreg/searchandretrieve/taxonomies/search.do?search=&searchString=&taxonomyName=WBT%20-%20Geographic%20Locations
Web Taxonomy - Geographic Locations
United States
EPA GIS Keyword Thesaurus
2007-11-02
https://www.epa.gov/geospatial/epa-metadata-technical-specification
EPA Metadata Technical Specification
Land
Federal Program Inventory
2013-09-16
https://www.performance.gov/federalprograminventory
Federal Program Inventory
020:118
-131.713346
-67.035518
25.757448
55.294691
This layer is built by combining boundaries from the 2025 Census American Indian/Alaska Native/Native Hawaiian Areas (AIANNH) data (visithttps://www.census.gov/programs-surveys/geography/technical-documentation/complete-technical-documentation/tiger-geodatabase-file.html for details) with Federally Recognized Tribal Entity Names as provided by EPA's Tribe Entity Mapping Spreadsheet (found at https://www.epa.gov/data/tribes-services ). The relationships between Tribal Areas and Tribal Entities were built during earlier work by EPA's American Indian Environmental Office (AIEO) while developing the Tribal Information Management System (TIMS), and updated to account for the latest Tribal Area and Tribal Entity additions.
There is a new tribe called Lumbee Tribe of North Carolina that was federally recognized on January 31, 2026 by the Lumbee Fairness Act. However, it was not available in the Census boundaries data. The Census tribal boundaries data is updated every fall.
Two new tribes that share the Wind River reservation boundaries are Northern Arapaho Tribe of the Wind River Reservation, Wyoming and Eastern Shoshone Tribe of the Wind River Reservation, Wyoming. The tribe that has a different boundary name in the 2025 Census geodatabase is Eastern Band of Cherokee Indians. Census changed it to Qualla Boundary. This was cross-checked by EPA and Census confirmed Qualla Boundary is for the Eastern Band of Cherokee Indians tribe. A note for the change was added to the dataset, shown in the Name_History column.
Three entities of Kickapoo Tribe of Indians of the Kickapoo Reservation in Kansas (100000126), Pueblo of San Felipe, New Mexico (100000220), and Santo Domingo Pueblo (100000123) were removed from the dataset because they have the Census class code as “D0”, which is “Statistical or legal area administered and/or claimed by two or more American Indian tribes”. Since they are not clearly marked as “Legal federally recognized” entities, they have been removed.
In addition to the updates listed above, all boundaries were replaced with 2025 census boundaries.
This layer is used to support EPA's analysis of regulated facilities, and environmental monitoring stations with regard to existence on or near Tribal lands.
This layer represents locations of American Indian Reservation lands in the lower 48 states as well as Alaska. The areas include all Reservations associated with Federally recognized tribal entities.
Changes:
May 28, 2026: Two new tribes that share the Wind River reservation boundaries are Northern Arapaho Tribe of the Wind River Reservation, Wyoming and Eastern Shoshone Tribe of the Wind River Reservation, Wyoming. The tribe that has a different boundary name in the 2025 Census geodatabase is Eastern Band of Cherokee Indians. Census changed it to Qualla Boundary. In addition, three reservation entities were removed due to their Census class code as "D0". See the document of "EPA Geospatial Tribal Data 2026 Update" for the details.
Boundaries
United States
Land
Tribal - Capacity Building (Environmental Programs and Management)
Unrestricted License
https://edg.epa.gov/EPA_Data_License.html
EPA Public Domain License
Steve Lennartz
EPA Office of Finance and Administration
Deputy Geospatial Information Officer
109 T.W. Alexander Drive
RTP
NC
27711
lennartz.steve@epa.gov
(919) 541-1058
[From Metadata Record] Steve Lennartz
EPA and US Census
dataset
EPSG
6.5(3.0.1)
0
Simple
FALSE
0
TRUE
FALSE
American Indian Reservations
Feature Class
0
OBJECTID
OBJECTID
OID
4
0
0
Internal feature number.
Esri
Sequential unique whole numbers that are automatically generated.
Shape
Shape
Geometry
0
0
0
Feature geometry.
Esri
Coordinates defining the features.
AIANNHNS
Census ANSI Code
String
8
0
0
Census American Indian/Alaska Native/Native Hawaiian Area ANSI code
Census American Indian/Alaska Native/Native Hawaiian Area ANSI code
GEOID
Census Area ID
String
5
0
0
American Indian/Alaska Native/Native Hawaiian Area identifier; a concatenation of Census American Indian/Alaska Native/Native Hawaiian Area census code and reservation/statistical area or off-reservation trust land Hawaiian home land indicator
U.S. Census Bureau
NAMELSAD
Description
String
100
0
0
Census name and the translated legal/statistical area description for American Indian/Alaska Native/ Native Hawaiian area
U.S. Census Bureau
CLASSFP
FIPS ID
String
2
0
0
Census Federal Information Processing Standards (FIPS) class code
U.S. Census Bureau
INTPTLAT
Latitude
String
11
0
0
Census latitude of the internal point
U.S. Census Bureau
INTPTLON
Longitude
String
12
0
0
Census longitude of the internal point
U.S. Census Bureau
NAME
Reservation
String
100
0
0
Census American Indian/Alaska Native/ Native Hawaiian Area name
U.S. Census Bureau
TRIBE_NAME
Tribe
String
350
0
0
Federal Registry Tribal Entity Name
EPA AIEO
EPA_ID
EPA ID
Integer
4
0
0
EPA Tribal Identifier Service Internal Code
EPA AIEO
BIA_CODE
BIA ID
String
3
0
0
Bureau of Indian Affairs Tribal Identifier
EPA AIEO
ALAND_MI
Land Area (mi)
Double
8
0
0
Total land area in square miles
USEPA
ALAND_KM
Land Aea (km)
Double
8
0
0
Total land area in square kilometers
USEPA
AWATER_MI
Water Area (mi)
Double
8
0
0
Total water area in square miles
USEPA
AWATER_KM
Water Area (km)
Double
8
0
0
Total water area in square kilometers
USEPA
TOTALAREA_MI
Alottment Area (mi)
Double
8
0
0
Total area in square miles
USEPA
TOTALAREA_KM
Alottment Area (km)
Double
8
0
0
Total area in square kilometers
USEPA
CURRENT_TO
Date Extracted
Date
8
0
0
Date source datasets were extracted
USEPA
SOURCE
Data Source
String
255
0
0
Source of geographic dataset
USEPA
Shape_Length
Shape_Length
Double
8
0
0
Length of feature in internal units.
Esri
Positive real numbers that are automatically generated.
Shape_Area
Shape_Area
Double
8
0
0
Area of feature in internal units squared.
Esri
Positive real numbers that are automatically generated.
STATE
State
Tribal Names service assigned State(s)
USEPA
String
10
0
0
REGION
Region
Tribal Names service assigned EPA Region(s)
USEPA
String
10
0
0
CURRENT_USE
Current Use
Current Use Flag from Tribal Name service
USEPA
String
1
0
0
COMMENT
Comment
Comment from Tribal Names service
USEPA
String
255
0
0
NAME_HISTORY
Name History
Name change history from Tribal Names service
USEPA
String
1620
0
0
LEAD_REGION
Lead Region
Lead EPA Region for multi-region tribes
EPA
String
10
0
0
20250314
B178E6D2-29E8-4966-8575-5446AC1A23FA
The Current American Indian/Alaska Native/Native Hawaiian Areas National (AIANNH) National geodatabase includes attributes for the following legal entities: federally recognized American Indian reservations and off-reservation trust land areas, state-recognized American Indian reservations, and Hawaiian home lands. The AIANNH feature class name is AmericanIndian_AlaskaNative_NativeHawaiian.
2024 Census TIGER/Line Geodatabase for American Indian Areas Related National Geodatabase
https://www2.census.gov/geo/tiger/TGRGDB24/tlgdb_2024_a_us_aiarelated.gdb.zip
ftp
Excel document that contains current and historic tribal data like tribal names, BIA codes, EPA Internal Identifiers, associated EPA regions, and lead EPA regions.
Tribe Entity Mapping Spreadsheet
https://www.epa.gov/data/tribes-services
Create a new feature class of Federally Recognized Reservations areas from the American Indian, Alaska Native, Native Hawaiian (AAIANNH) layer. This is performed by:
Part A--sub-setting the layer by running this query: (CLASSFP IN ('D1','D2','D3') AND COMPTYP = 'R' AND FUNCSTAT = 'A'). Part B--create one to many join of old production features with new elements added from updated EPA Tribal Names Service dataset. Note that joins to Census data require GEOID and joins to EPA Tribal Names require EPA_ID. Resulting feature class includes duplicated features for joint use areas.
2026-05-28T00:00:00
File Geodatabase Feature Class
https://segs-epa.hub.arcgis.com/datasets/EPA::epa-american-indian-reservations-air/about
download
Steve Lennartz
EPA Office of Finance and Administration
Deputy Geospatial Information Officer
109 T.W. Alexander Drive
RTP
NC
27711
lennartz.steve@epa.gov
(919) 541-1058
[From Metadata Record] Steve Lennartz