William W Walker JR
Harpswell, ME Doing business as Environmental Engineer
- UEI
- NW83UBCW3CJ5
- CAGE
- 1YFU8
- Primary NAICS
- 541620 Environmental Consulting Services
- SAM.gov registration
- Active through
Company facts
- FY2025 rankings
- Self-certified in SAM.gov
- Entity structure
- Sole Proprietorship
- Other NAICS codes in SAM.gov
- SAM.gov registration date
- Physical address
- 51 Potts Point Rd, Harpswell, ME 04079, USA
- Website
- wwwalker.net
- Employees
- 11-50
- Estimated annual revenue
- $1M-$10M
- Industry
-
- Industrials
- Capital Goods
- Construction & Engineering
- SIC code
- 87 Engineering & Management Services
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 | $185,000 |
| FY2025 | $145,000 |
| FY2024 | $145,440 |
| FY2023 | $160,786 |
Top agencies by obligations
| Rank | Agency | Obligated, FY2026–FY2027 | Share |
|---|---|---|---|
| 1 | Department of the Interior | $185,000 |
Contract awards
Latest 5 listed here. See the rest on GovTribe.
Similar vendors
| Vendor | Location | Primary NAICS |
|---|---|---|
| Kleinschmidt Associates | Pittsfield, ME | 541330 Engineering Services |
| Tighe & Bond Inc. | Westfield, MA | 541330 Engineering Services |
| Aquatech Compliance Services LLC | Keene, NH | 541620 Environmental Consulting Services |
| ESA | San Francisco, CA | 541620 Environmental Consulting Services |
| Horsley & Witten Inc. | Sandwich, MA | 541620 Environmental Consulting Services |
About the company
William W Walker JR, doing business as Environmental Engineer, is a sole proprietorship based in Harpswell, Maine, that serves as a prime contractor delivering water quality analysis, modeling, and environmental consulting services to federal natural-resource and environmental agencies. The vendor operates exclusively in the full-and-open market with no set-aside designations across its recent prime award footprint.
The vendor's customer concentration is extreme. The Department of the Interior's National Park Service Southeast Region anchors 18 of 23 named awards (77% of award count), representing $5.1 million of the $7.3 million combined potential value across the entire portfolio. The remaining customer agencies—the Department of Justice Environment and Natural Resources Division, the Justice Management Division, the National Park Service (non-regional), and the Army Corps of Engineers—collectively account for one or two small awards each. This concentration reflects a sustained specialization in Everglades and regional park water-quality work. Within the Southeast Region customer relationship, the vendor places task orders under five named indefinite delivery contracts: INP14PC00656 (2 task orders, $486 thousand), INPC5297070210 (2 task orders, $294 thousand), INP13PC00393 (2 task orders, $180 thousand), INP12PC20504 (1 task order, $265 thousand), and INP13PC00298 (1 task order, $136 thousand). Representative recent work includes a $268.5 thousand firm fixed-price contract awarded May 2, 2023 (set-aside Total Small Business) for water quality program technical services; a $165 thousand September 18, 2024 award for water quality analysis and modeling; a $185 thousand September 5, 2025 award (later modified with $40 thousand from Fish and Wildlife Service funding); and a $145 thousand September 25, 2026 definitive contract for water quality analysis and modeling at Everglades National Park, completing September 30, 2027.
Activity has been sparse and flat — one award per year in 2023, 2024, 2025, and 2026 — over the source window, with combined dollars obligated at $6.8 million (92% of combined potential value), indicating strong execution-to-value alignment. Only one award (the $145 thousand Everglades contract) reaches completion within the next twenty-four months, posing minimal near-term recompete pressure. The vendor has no subcontract footprint and does not sit on any government-wide acquisition contracts, schedule vehicles, or multi-award IDIQs; all work flows through direct task orders against single-agency indefinite delivery contracts held with the National Park Service Southeast Region. NAICS concentration tilts toward Environmental Consulting Services (11 awards) and Other Scientific and Technical Consulting Services (6 awards), with PSC work distributed across Water Quality studies (4 awards), Professional Engineering/Technical support (6 awards), and Expert Witness services (7 awards).
Quick answers
Is William W Walker JR registered in SAM.gov?
Yes. William W Walker JR's SAM.gov registration is active through October 2, 2027.
How much has William W Walker JR received in federal contracts?
Federal contracts obligated $145,000 to William W Walker JR in fiscal year 2025 and $636,226 in fiscal years 2023 through 2027.
How does William W Walker JR rank among federal contractors?
William W Walker JR ranked #20 in PSC B533 in FY2025.
What is William W Walker JR's most recent federal award?
William W Walker JR's most recent federal contract award is E0 14398 service, water quality analysis/modeling service for everglades national park (140P5426C0029), from Southeast Region (NPS), on September 25, 2026.
On GovTribe
See William W Walker JR's full federal record
- Federal contract awards
- IDV awards
- Funding analysis by agency, NAICS and set-aside
- Similar vendors