Top Interior engineering services contractors
In the 12 months ending Oct 5, 2026, the Department of the Interior obligated $168.5M in net prime contract dollars under NAICS 541330, down 10.7% from $188.7M in the preceding 12 months. 161 prime contractors received positive obligations, and 37 of them accounted for 80% of that spend.
Prime contracts funded by the Department of the Interior. Latest 12 months: Oct 6, 2025 to Oct 5, 2026. Source: USAspending.gov.
Obligations by fiscal year
Net prime contract obligations by federal fiscal year (October to September).
Top Interior contractors for NAICS 541330
Ranked by positive obligations in the latest 12 months. Share is of all positive obligations in this market.
| # | Contractor | Latest 12 mo | Prior 12 mo | Share | Rank change |
|---|---|---|---|---|---|
| 1 | General Dynamics Mission Systems, Inc. | $13.1M | $12.8M | 7.7% | ▲ 1 |
| 2 | HDR Engineering Inc | $10.8M | $10.9M | 6.3% | ▲ 1 |
| 3 | Otak, Inc. | $9.8M | $3.7M | 5.8% | ▲ 12 |
| 4 | Dowl, LLC | $8.3M | $3.3M | 4.8% | ▲ 14 |
| 5 | Jacobs Government Services Company | $8.1M | $9.6M | 4.7% | ▼ 1 |
| 6 | Barr Engineering Co. | $7.1M | $536K | 4.2% | ▲ 58 |
| 7 | Ameresco Inc | $6.2M | $5.4M | 3.6% | ▲ 1 |
| 8 | Stantec Consulting Services Inc. | $6.1M | $6.9M | 3.6% | ▼ 2 |
| 9 | Msmm Huitt-Zollars a Joint Venture LLC | $5.8M | $59K | 3.4% | ▲ 122 |
| 10 | DHM Design Corporation | $4.7M | −$74K | 2.8% | New |
| 11 | Siemens Government Technologies Inc | $4.3M | $4.2M | 2.5% | ▲ 1 |
| 12 | DJ&A, P.C. | $3.8M | $4.1M | 2.2% | ▲ 1 |
| 13 | Vanasse Hangen Brustlin, Inc. | $3.8M | $1.1M | 2.2% | ▲ 24 |
| 14 | AECOM Technical Services, Inc. | $3.6M | $9.1M | 2.1% | ▼ 9 |
| 15 | Joseph David Associates LLC | $3.4M | $1.4M | 2.0% | ▲ 17 |
What changed in the last 12 months
Contractors with the largest change in reported obligations versus the preceding 12 months.
Largest gains
- Barr Engineering Co.$536K → $7.1M (+$6.6M) · now #6
- Otak, Inc.$3.7M → $9.8M (+$6.1M) · now #3
- Msmm Huitt-Zollars a Joint Venture LLC$59K → $5.8M (+$5.7M) · now #9
Largest declines
- Forsgren Associates Inc$19.4M → $1.8M (−$17.6M) · now #23
- Blue Arrow Architecture LLC$6.8M → $0 (−$6.8M) · no latest-period obligations
- Stanley-Dowl JV$5.3M → −$974K (−$6.3M) · no latest-period obligations
New to this market
30 contractors received their first obligations in this market (since FY2022) during the latest 12 months. The largest:
| Contractor | First obligation | Latest 12 mo |
|---|---|---|
| Stillwater-Anchor Joint Venture | Feb 10, 2026 | $1.5M |
| Kenall-Halff JV, LLC | Dec 23, 2025 | $1.1M |
| Brown Construction Services, Inc | Feb 9, 2026 | $1.0M |
| Mabbett & Associates, Inc. | May 12, 2026 | $537K |
| Method Architecture, LLC | Sep 23, 2026 | $407K |
| Building Energy Solutions Provider (Besp), LLC | Sep 23, 2026 | $406K |
| Vika Virginia, LLC | Sep 25, 2026 | $397K |
| Henry Adams, LLC | Sep 13, 2026 | $334K |
Where the money comes from
Funding sub-agencies within the Department of the Interior, latest 12 months. The funding organization can differ from the office that runs the requirement.
| Funding sub-agency | Latest 12 mo | Prior 12 mo | Change |
|---|---|---|---|
| National Park Service | $77.7M | $80.5M | Down $2.8M (3.4%) |
| Bureau of Indian Affairs and Bureau of Indian Education | $33.6M | $30.7M | Up $2.9M (9.5%) |
| U.S. Geological Survey | $15.8M | $17.9M | Down $2.2M (12.1%) |
| Bureau of Reclamation | $15.4M | $27.4M | Down $12.0M (43.8%) |
| Departmental Offices | $10.6M | $9.0M | Up $1.6M (17.1%) |
| Bureau of Land Management | $7.2M | $7.1M | Up $80K (1.1%) |
Potential recompetes
Large awards in this market whose current period of performance ends in the next 18 months. Treat these as research leads: options, extensions, and follow-on vehicles often change the timing.
| Award | Incumbent | Obligated | Current end |
|---|---|---|---|
| 140P2024F0406 | HDR Engineering, Inc. GRCA 318719 - CD/SS/COMPLIANCE REHABILIT | $12.5M | Dec 31, 2026 |
| 140P2023F0235 | Jacobs Government Services Company GRCA 257282 - REPLACE SOUTH RIM WASTEWATER TREATMENT PLANT, GRAND CANYON NATIONAL PARK, GRAND CANYON, AZ | $5.7M | Dec 31, 2026 |
| 140D0422F0182 | Guidehouse Digital LLC GAOA LRF PMO CONTRACTOR SUPPORT | $13.7M | Feb 14, 2027 |
| 140P2026F0068 | Msmm Huitt-Zollars a Joint Venture LLC EVER 290451 - REHAB PARKWIDE WATER/WASTEWATER (FLAMINGO DISTRICT) AT EVERGLADES NATIONAL PARK, FLORIDA ARCHITECTURAL AND ENGINEERING (A-E) SERVICES DESIGN DEVELOPMENT (DD) AND… | $5.7M | Apr 23, 2027 |
| 140R2023F0098 | Stantec Consulting Services Inc. LAHONTAN BASIN AREA OFFICE (LBAO) TAHOE DAM REPLACEMENT FEASIBILITY STUDY | $6.7M | May 31, 2027 |
| 140G0126F0237 | General Dynamics Mission Systems, Inc. LANDSAT OPERATIONS TO 17 - OPERATIONS AND SUSTAINMENT | $11.8M | Jul 19, 2027 |
| 140A1623F0046 | GEI Consultants Inc OGLALA CONSTRUCTION PHASED SERVICES | $6.0M | Sep 30, 2027 |
| 140A1622F0164 | Seven Generations Architecture & Engineering LLC MANY FARMS HIGH SCHOOL DESIGN SERVICES | $11.7M | Dec 31, 2027 |
| 140A1623F0160 | AECOM Technical Services, Inc. 2024 COMPREHENSIVE REVIEWS - GROUP 1 | $6.8M | Jan 26, 2028 |
| 140A1625F0112 | Barr Engineering Co. 2025 COMPREHENSIVE REVIEWS GROUP 2 | $5.8M | Feb 1, 2028 |
Common questions
Who are the top Interior contractors for NAICS 541330?
In the latest 12 months, General Dynamics Mission Systems, Inc. ($13.1M), HDR Engineering Inc ($10.8M), Otak, Inc. ($9.8M) received the most Interior obligations for engineering services.
How concentrated is this market?
The eight largest primes held 40.8% of positive obligations, and General Dynamics Mission Systems, Inc. alone held 7.7%. 30 contractors won their first obligations in this market during the latest 12 months.
Are any large Interior NAICS 541330 contracts ending soon?
10 of the largest awards in this market reach their current end date in the next 18 months. The first is 140P2024F0406 (HDR Engineering, Inc., $12.5M obligated), ending Dec 31, 2026. An end date is a research lead, not a confirmed recompete: options and extensions often move it.
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$286.4MFigures are net obligations on prime contracts (award types A–D) from USAspending.gov, grouped by funding agency and the NAICS code on each award. Net obligations include deobligations and corrections, so they can differ from positive-obligation totals. See methodology.
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