Department of the Interior PSC B510 contractors

SPECIAL STUDIES/ANALYSIS- ENVIRONMENTAL ASSESSMENTS. Contractors in this PSC lane under Department of the Interior.

Agency: Department of the Interior

Last updated: April 17, 2026

Visible recipients

Mapped obligations

$195,965,352

Visible recipients tied to Department of the Interior and PSC B510

Navajo Nation

Window Rock, AZ

Window Rock, AZ | 20 awards | Top agency Department of the Treasury | NAICS 541620

$24,918,727

Hdr Environmental, Operations And Construction, Inc.

Englewood, CO

Englewood, CO | 109 awards | Top agency Department of Defense | NAICS 541330

$82,883,671

Yurok Tribe

Klamath, CA

Klamath, CA | 135 awards | Top agency Department of the Interior | NAICS 238910

$334,219

Wsp USA Solutions INC

Arlington, VA

Arlington, VA | 228 awards | Top agency Department of Defense | NAICS 541330

$30,115,322

Michael Baker International Holdco Corporation

Moon Township, PA

Moon Township, PA | 5 awards | Top agency Department of Defense | NAICS 541330

$1,689,369

Stantec Consulting Services Inc.

Denver, CO

Denver, CO | 138 awards | Top agency Department of Defense | NAICS 541330

$51,198,742

Hntb Corporation

Kansas City, MO

Kansas City, MO | 24 awards | Top agency Department of Defense | NAICS 541330

$2,853,066

Wsp USA Buildings INC

New York, NY

New York, NY | 5 awards | Top agency Department of Defense | NAICS 541330

$746,106

Brown And Caldwell

San Diego, CA

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

$1,177,261

Jicarilla Apache Tribe

Dulce, NM

Dulce, NM | 7 awards | Top agency Department of the Interior | NAICS 813312

$44,500

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