Department of the Interior NAICS 541620 contractors

Environmental Consulting Services. Contractors in this NAICS lane under Department of the Interior.

Agency: Department of the Interior

Last updated: April 17, 2026

Visible recipients

Mapped obligations

$1,542,071,572

Visible recipients tied to Department of the Interior and NAICS 541620

Osage Nation Energy Services LLC

Tulsa, OK

Tulsa, OK | 17 awards | Top agency Department of Defense | NAICS 562910

$10,150,385

Hualapai Tribe

Peach Springs, AZ

Peach Springs, AZ | 20 awards | Top agency Department of the Interior | NAICS 541620

$234,978

Ahtna Solutions, LLC

Anchorage, AK

Anchorage, AK | 62 awards | Top agency Department of Defense | NAICS 562910

$14,327,409

Hdr, INC

Omaha, NE

Omaha, NE | 5 awards | Top agency Department of Veterans Affairs | NAICS 541310

$8,720

Alabama Coushatta Tribe Of Texas

Livingston, TX

Livingston, TX | 82 awards | Top agency Department of Health and Human Services | NAICS 541620

$99,150

Yavapai Apache Nation

Camp Verde, AZ

Camp Verde, AZ | 48 awards | Top agency Department of the Interior | NAICS 531120

$100,000

Icf Incorporated

Fairfax, VA

Fairfax, VA | 5 awards | Top agency Department of Health and Human Services | NAICS 541611

$387,719,464

Brown And Caldwell

San Diego, CA

San Diego, CA | 5 awards | Top agency Department of Defense | NAICS 541330

$2,330,004

Santa Ynez Band Of Mission Indians

Santa Ynez, CA

Santa Ynez, CA | 51 awards | Top agency Department of the Treasury | NAICS 541620

$116,526

Atkins North America, Inc.

Dallas, TX

Dallas, TX | 8 awards | Top agency Department of Defense | NAICS 541330

$4,536,281

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