Duwamish Services LLC
Seattle, WA
- UEI
- Z6JFGB3CE1R7
- CAGE
- 7TAU4
- Primary NAICS
- 237990 Other Heavy and Civil Engineering Construction
- SAM.gov registration
- Active through
Company facts
- FY2025 rankings
- SBA certifications
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HUBZone Firm· Current
- Self-certified in SAM.gov
- Entity structure
- Corporate Entity (Not Tax Exempt)
- Other NAICS codes in SAM.gov
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- 115310 Support Activities for Forestry
- 212321 Construction Sand and Gravel Mining
- 213112 Support Activities for Oil and Gas Operations
- 238290 Other Building Equipment Contractors
- 238990 All Other Specialty Trade Contractors
- 488320 Marine Cargo Handling
- 532412 Construction, Mining, and Forestry Machinery and Equipment Rental and Leasing
- Corporate family
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- Seattle, WA W733ZDL86L18
- Seattle, WA YWP7Z7Y1XGT1
- Seattle, WA NX9TDPGHC1L1
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- SAM.gov registration date
- Physical address
- 7421 5th Ave S, Seattle, WA 98108, USA
Registration and certifications come from SAM.gov and the SBA; company details from public web sources. Updated .
Contract obligations by fiscal year
| Fiscal year | Obligated |
|---|---|
| FY2027 To date | $0 |
| FY2026 | -$489,616 |
| FY2025 | $3,451,750 |
| FY2024 | $0 |
| FY2023 | $2,350,750 |
Contract awards
Latest 5 listed here. See the rest on GovTribe.
Similar vendors
| Vendor | Location | Primary NAICS |
|---|---|---|
| Western Marine Construction, Inc. | Seattle, WA | 237990 Other Heavy and Civil Engineering Construction |
| Redside Construction LLC | Bainbridge Island, WA | 237990 Other Heavy and Civil Engineering Construction |
| American Construction Co., Inc. | Tacoma, WA | 237990 Other Heavy and Civil Engineering Construction |
| Duwamish-Pacific Joint Venture | Seattle, WA | 237990 Other Heavy and Civil Engineering Construction |
| Camenzind Dutra JV LLC | Palo Alto, CA | 237990 Other Heavy and Civil Engineering Construction |
About the company
Duwamish Services LLC is a Seattle, Washington-based limited liability corporation and SBA Certified HUBZone Firm that has established itself as a specialized provider of marine construction and environmental restoration services to federal agencies. Registered in SAM.gov since February 2017, the company holds a self-certification as a Small Disadvantaged Business and operates as a for-profit organization focused on complex waterway maintenance and material procurement projects. The company demonstrates particular expertise in hydraulic dredging operations, armor rock procurement and placement, and specialized marine infrastructure work that supports the federal government's mission to maintain navigable waterways and protect critical environmental resources across the Pacific Northwest and beyond.
Duwamish Services LLC has successfully executed three significant prime federal contract awards totaling approximately $5.65 million, with work concentrated in dredging operations and marine material supply. Most recently, the U.S. Army Corps of Engineers Seattle District awarded the company a $1.9 million firm fixed-price definitive contract in October 2025 for hydraulic dredging services on the Snohomish River Federal Navigation Channel, involving removal of approximately 190,000 cubic yards of material with completion targeted for March 2026. In July 2025, the same federal agency awarded a $1.4 million definitive contract for maintenance hydraulic dredging on the Quillayute River Federal navigation channel in La Push, Washington, exercising option contract line items and requiring careful coordination with tribal interests and environmental considerations. Additionally, the Department of the Interior Fish and Wildlife Service awarded a $2.35 million purchase order in March 2023 for armor rock and stone material procurement, loading, transportation, and offloading via barge to Midway Atoll National Wildlife Refuge for seawall repair and habitat restoration work. All three awards carried HUBZone or Total Small Business set-aside designations, reflecting the company's qualification as a small business contractor and its focus on economically disadvantaged business zone opportunities.
Quick answers
Is Duwamish Services LLC registered in SAM.gov?
Yes. Duwamish Services LLC's SAM.gov registration is active through March 3, 2027.
Which SBA certifications does Duwamish Services LLC hold?
Duwamish Services LLC holds HUBZone Firm certification from the SBA.
How much has Duwamish Services LLC received in federal contracts?
Federal contracts obligated $3,451,750 to Duwamish Services LLC in fiscal year 2025 and $5,312,884 in fiscal years 2023 through 2027.
How does Duwamish Services LLC rank among federal contractors?
Duwamish Services LLC ranked #92 in PSC Y1PZ in FY2025.
What is Duwamish Services LLC's most recent federal award?
Duwamish Services LLC's most recent federal contract award is FY25 everett hydraulic dredging, everett - washington (W912DW25C0013), from ENDIST Seattle (USACE), on October 16, 2025.
On GovTribe
See Duwamish Services LLC's full federal record
- Federal contract awards
- IDV awards
- Contract vehicles
- Funding analysis by agency, NAICS and set-aside
- Similar vendors