What NAICS 541690 Covers
NAICS 541690 captures consulting services that don't fit neatly into adjacent codes like environmental engineering (541330) or research and development (541715). The Census Bureau defines it as: firms primarily engaged in providing advice and assistance to other organizations on scientific and technical matters, excluding R&D.
In practice, federal buyers use this code for:
- Environmental site assessments and remediation technical support
- Energy systems analysis and technical feasibility studies
- Ecological risk assessments for EPA and Army Corps projects
- Agricultural science advisory for USDA programs
- Nuclear safety and radiological assessments for DOE and NRC
- Climate modeling support and greenhouse gas inventory work
- Laboratory quality management consulting
- Occupational health and industrial hygiene advisory services
The breadth matters. If you provide technical consulting that spans multiple disciplines, this code gives you flexibility that a narrower code doesn't.
Federal Spend: Size and Direction
Federal agencies obligated roughly $3.1 billion under NAICS 541690 in FY2023, according to USASpending.gov data. That figure has grown at approximately 6–8% annually over the prior three fiscal years, driven primarily by EPA's accelerated Superfund remediation program, DOE's expanded nuclear cleanup budget under the Bipartisan Infrastructure Law, and USDA's technical assistance expansion for climate-smart agriculture.
The top five federal buying agencies by obligation volume:
- Environmental Protection Agency — Superfund site support, risk assessment, compliance technical assistance
- Department of Energy — Nuclear site cleanup, energy technology assessment, environmental monitoring
- Department of Agriculture — Soil, water, and forestry technical consulting; conservation program support
- Department of Defense — Installation environmental compliance, PFAS investigation support, range safety
- Department of the Interior — Natural resource damage assessment, tribal environmental technical support
EPA and DOE together account for roughly 40% of total 541690 obligations. Both agencies have multi-year programs that generate recurring task orders, which matters when you're planning pipeline.
SBA Size Standard
The SBA size standard for NAICS 541690 is $19 million in average annual receipts (based on the most recent three fiscal years). That threshold applies for small business set-aside eligibility, including 8(a), HUBZone, WOSB, and SDVOSB programs.
Firms under $19M in revenue qualify as small. Firms under roughly $4–5M in revenue are typically competitive for micro-set-asides under the simplified acquisition threshold ($250,000 for most civilian agencies, $1 million for some IT and defense buys under certain authorities).
Set-Aside Distribution Under This Code
Looking at awarded contracts over the past three years, set-aside usage breaks down roughly as follows (based on USASpending.gov filters for NAICS 541690):
- Small Business Set-Aside: ~35% of award actions
- 8(a) Sole Source and Competitive: ~22%
- HUBZone Set-Aside: ~14%
- WOSB/EDWOSB: ~9%
- SDVOSB: ~8%
- Full and Open Competition: ~12%
HUBZone is overrepresented here relative to other NAICS codes. That's not accidental. EPA Superfund sites, DOE legacy nuclear installations, and USDA conservation districts concentrate in rural counties and economically distressed areas that qualify as HUBZones. If you're operating in Appalachia, the Gulf Coast energy corridor, the Mountain West near DOE facilities, or rural agricultural counties, check your address at the SBA's HUBZone map. The certification takes roughly 60–90 days and the competitive edge in 541690 is real.
8(a) competitive pools for this NAICS tend to be small. Many task orders under large 8(a) IDIQ vehicles draw only three to six proposals. That's a tractable number for a firm with a clear technical focus.
Key Contract Vehicles
Most 541690 work moves through vehicles, not standalone solicitations. The ones worth pursuing:
GSA Multiple Award Schedule (MAS) The relevant Schedule is Professional Services (formerly Schedule 00CORP merged into MAS). The applicable SINs are: - SIN 541690 — Other Scientific and Technical Consulting Services (direct match) - SIN 541380 — Testing Laboratories (adjacent, sometimes paired)
Getting on MAS opens you to agency task orders without competing on each individual solicitation. EPA, USDA, and Interior use MAS heavily for smaller task orders ($100K–$2M range).
SEWP V (Solutions for Enterprise-Wide Procurement) Less relevant for pure consulting, but DOE and DOD sometimes issue technical advisory task orders through SEWP when IT-adjacent work is involved. Monitor but don't prioritize.
EPA SITE Acquisition Vehicle EPA uses several agency-specific IDIQs for Superfund and environmental technical support. The main ones are not always open for new awards, but EPA publishes a forecast. Watch for recompetes.
DOE Office of Environmental Management (EM) IDIQs DOE EM manages cleanup at 16+ major sites. The office issues site-specific IDIQs and occasionally opens broader technical support vehicles. Awards here tend to be large ($10M–$100M ceiling), but task orders can be modest. Teaming with a larger prime is the typical entry path.
Army Corps of Engineers IDIQ Vehicles The Corps issues environmental and scientific consulting IDIQs through district offices. These are geographic and often small-business set-aside. Search SAM.gov for Corps solicitations in your target region.
USDA Agricultural Research Service (ARS) BPAs and IDIQs ARS issues blanket purchase agreements for scientific consulting support. These are often set-aside at the BPA level, then competed among BPA holders for individual orders. Smaller dollar values ($50K–$500K per order) but consistent flow.
Certifications That Create Competitive Advantage
Beyond core small business status, three certifications produce measurable win-rate lift in 541690:
HUBZone certification Already covered above, but to be direct: if your principal office qualifies, get this first. The 10% price evaluation preference and the statutory 3% government-wide goal create genuine pull in agencies that are behind on their HUBZone spend. EPA and DOE are both chronically below target.
8(a) Business Development Program Eight years of protected competition plus sole-source authority up to $4.5M (services). The 8(a) pipeline for scientific consulting is strong because agencies can justify sole-source awards for niche technical expertise. If you have a defensible specialization (PFAS site assessment, nuclear criticality safety, soil carbon measurement), the sole-source argument writes itself.
WOSB / EDWOSB Certification NAICS 541690 is not on the WOSB-eligible industry list maintained by SBA, which limits formal WOSB set-asides under this code. However, WOSB certification still signals credibility, counts toward agency diversity spend goals, and qualifies you for WOSB set-asides on adjacent SINs when work is multi-disciplinary. Verify current SBA WOSB industry lists before relying on this for a specific solicitation.
SDVOSB certification VA-verified SDVOSB certification opens VA-specific set-asides, but DOD and VA together make up a smaller slice of 541690 spend. Still worth holding if you're a veteran-owned firm; it layers with other preferences.
Finding Active Solicitations
SAM.gov (beta.SAM.gov) Filter by: NAICS 541690, Set-Aside Type (choose your certification), Posted Date (last 30 days). Set up a saved search with email alerts. Check weekly; some task order solicitations are open for 5–7 days.
Agency Forecast Tools - EPA: epa.gov/contracts/epa-acquisition-forecast — updated quarterly - DOE EM: The Office of Environmental Management publishes an annual acquisition forecast. Search "DOE EM acquisition forecast FY2025." - USDA: USASpending.gov agency page for USDA, filtered by 541690 and "base and all options value," shows you which program offices spend here and at what volume.
GovWin IQ and Deltek Paid tools. If you're serious about building a federal pipeline, GovWin's forecast database surfaces pre-solicitation intelligence 6–18 months out. At $5K–$15K/year, it pays back quickly if you're winning $200K+ contracts.
Procurement Technical Assistance Centers (PTACs) Free. PTACs provide bid-matching services, proposal review, and introductions to contracting officers. Find your local PTAC at aptac.org. The quality varies by region, but the bid-match service alone justifies the time.
What a First Contract Looks Like
For a new entrant with no federal past performance, the realistic first contract is a small task order under an existing vehicle, not a standalone solicitation.
The path:
- Get on GSA MAS under SIN 541690. This takes 3–4 months and costs nothing beyond your time. It makes you visible to contracting officers running market research.
- Target micro-purchase and simplified acquisition threshold awards. Contracting officers can award up to $10,000 without competition (micro-purchase) and up to $250,000 with streamlined competition. These smaller awards don't require past performance in the same way.
- Pursue a subcontract with a large prime on an active IDIQ. EPA and DOE large prime contractors (Tetra Tech, Arcadis, ICF) regularly subcontract technical consulting work to small firms. Subcontracts give you a deliverable record and a past performance citation without the prime contract overhead.
- Leverage your state or local environmental consulting work. State EPA equivalents and local government environmental contracts are acceptable past performance citations for federal proposals when no federal history exists. Document scope, dollar value, and outcome clearly.
- File a Sources Sought response. When an agency posts a Sources Sought notice for 541690 work, respond. You won't win a contract from it, but contracting officers read them, and it puts your name in front of the program office before the solicitation drops.
A realistic first-year target: one subcontract citation and one GSA MAS task order in the $75K–$150K range. That's enough to answer the past performance question on the next proposal.
The agencies spending $3 billion here are not looking for the largest firm. They're looking for demonstrable technical expertise and a track record of delivering on scope. Both are achievable without 10 years of federal history.
