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
- SBA certifications
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HUBZone Firm· Current
- Self-certified in SAM.gov
- Entity structure
- Corporate Entity (Not Tax Exempt)
- NAICS codes registered in SAM.gov
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- 237990 Other Heavy and Civil Engineering Construction Primary
- 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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Duwamish Services LLC
Z6JFGB3CE1R7
- Ds-Jem W733ZDL86L18
- Duwamish-Orion JV, LLC YWP7Z7Y1XGT1
- Duwamish-Pacific Joint Venture NX9TDPGHC1L1
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Duwamish Services LLC
Z6JFGB3CE1R7
- 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 .
Recent federal awards
| Award | Agency | Obligated | Awarded |
|---|---|---|---|
| FY25 everett hydraulic dredging, everett - washington | ENDIST Seattle | $1,713,420 | |
| FY25 quillayute maintenance dredging. Seattle district requires maintenance hydraulic dredging from the quillayute river… | ENDIST Seattle | $1,248,714 | |
| HI-midway atoll- 2023 RIP RAP | Fish and Wildlife Service | $2,350,750 | |
| Friday harbor breakwater repair | ENDIST Seattle | $82,395 | |
| Lower monumental fish ladder grating replacement | ENDIST Walla Walla | $317,999 |
About Duwamish Services LLC
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
What is Duwamish Services LLC's UEI?
Duwamish Services LLC's Unique Entity ID (UEI) in SAM.gov is Z6JFGB3CE1R7.
What is Duwamish Services LLC's CAGE code?
Duwamish Services LLC's CAGE code is 7TAU4.
What is Duwamish Services LLC's primary NAICS code?
Duwamish Services LLC's primary NAICS code is 237990 (Other Heavy and Civil Engineering Construction).
Where is Duwamish Services LLC located?
Duwamish Services LLC's physical address in SAM.gov is 7421 5th Ave S, Seattle, WA 98108, USA.
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.
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, 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
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