What is the SBA size standard for NAICS 541620?

The SBA size standard for NAICS 541620 (Environmental Consulting Services) is $19 million in average annual receipts, per 13 C.F.R. § 121.201.

Which federal agencies buy under NAICS 541620?

For FY2024 reporting, the leading federal customers under NAICS 541620 were Department of Defense, Environmental Protection Agency, Department of Energy, U.S. Army Corps of Engineers, Department of the Interior. Live obligation data is available on USAspending.gov.

What FAR or DFARS clauses commonly apply to NAICS 541620 contracts?

Frequent clause flowdowns include FAR 52.222-41 (Service Contract Labor Standards); FAR 52.236-13 (Accident Prevention); FAR 52.219-14 (Limitations on Subcontracting); FAR 52.227-14 (Rights in Data — General). Each contract instrument will incorporate clauses by reference under FAR 52.252-2; this list reflects the high-frequency set for this NAICS, not an exhaustive flowdown.

Professional, Scientific, Technical Services

NAICS 541620 — Environmental Consulting Services

NEPA reviews, environmental site assessments, remediation planning, regulatory compliance, and environmental impact studies. Heavy use across DoD installations, EPA Superfund, and Department of Energy environmental management.

Quick facts

SBA size standard: $19 million; Average annual receipts · 13 C.F.R. § 121.201
FY2024 federal obligations: $1B–$2B; See live USAspending.gov data →

Top federal customers

Federal agencies that obligate the most spending under NAICS 541620 (FY2024 reporting period). Order tracks federal-obligation volume on USAspending.gov.

1.Department of Defense
2.Environmental Protection Agency
3.Department of Energy
4.U.S. Army Corps of Engineers
5.Department of the Interior

Set-aside fit

Whether NAICS 541620 commonly carries set-aside designations on federal awards. Eligibility for any specific solicitation is set by the contracting officer; this table reflects the FY2024 award pattern, not a guarantee of set-aside status.

SDVOSB (Service-Disabled Veteran-Owned Small Business)
8(a) Business Development Program
HUBZone Small Business
WOSB / EDWOSB
VOSB (Veteran-Owned Small Business)

Strong SDVOSB / 8(a) presence on DoD environmental services IDIQs. Frequently teamed with 562910 remediation primes.

Frequent prime contractors

Companies that most frequently appear as prime awardees under NAICS 541620 for FY2024. Drawn from USAspending.gov public award records — verify currency at the live link below.

Tetra Tech
AECOM
Jacobs Solutions
Stantec
CDM Smith
Arcadis
WSP USA
Versar
SES Construction and Fuel Services
CB&I Federal Services

See live award data on USAspending.gov →

Common FAR / DFARS clauses

Frequently flowed-down clauses on contracts in this NAICS. The clause text on acquisition.gov is authoritative; this list captures the practical pattern, not an exhaustive flowdown.

FAR 52.222-41Service Contract Labor Standards
SCA applies to field environmental technicians not in exempt professional categories.
FAR 52.236-13Accident Prevention
Field site work triggers OSHA and accident-prevention flowdowns.
FAR 52.219-14Limitations on Subcontracting
Services-based limitation on set-aside awards.
FAR 52.227-14Rights in Data — General
Default for technical environmental reports.

Indirect rate considerations

Hybrid services / field-equipment cost structure. Site overhead is real because field crews carry vehicle and sampling equipment burden separate from office staff. USACE EP 1110-1-8 equipment cost recovery applies on Corps task orders. Lab analysis costs flow through direct.

See FieldLedger's Indirect Rate Engine for pool definition and rate tracking, or read the FieldLedger methodology for the underlying FAR Part 31 framework.

How FieldLedger fits NAICS 541620

Signed timekeeping plus equipment costing under USACE EP 1110-1-8 for field gear. Indirect Rate Engine handles the dual fringe / site-overhead structure. Project P&L tracks task orders against funding.

DCAA compliance →Indirect Rate Engine →DCAA readiness check →

Frequently asked

What is the SBA size standard for NAICS 541620?: The SBA size standard for NAICS 541620 (Environmental Consulting Services) is $19 million in average annual receipts, per 13 C.F.R. § 121.201.
Is NAICS 541620 eligible for SDVOSB, 8(a), HUBZone, or WOSB set-asides?: Set-aside programs that commonly apply: SDVOSB, 8(a), HUBZone, WOSB, VOSB. Strong SDVOSB / 8(a) presence on DoD environmental services IDIQs. Frequently teamed with 562910 remediation primes.
Which federal agencies buy under NAICS 541620?: For FY2024 reporting, the leading federal customers under NAICS 541620 were Department of Defense, Environmental Protection Agency, Department of Energy, U.S. Army Corps of Engineers, Department of the Interior. Live obligation data is available on USAspending.gov.
What FAR or DFARS clauses commonly apply to NAICS 541620 contracts?: Frequent clause flowdowns include FAR 52.222-41 (Service Contract Labor Standards); FAR 52.236-13 (Accident Prevention); FAR 52.219-14 (Limitations on Subcontracting); FAR 52.227-14 (Rights in Data — General). Each contract instrument will incorporate clauses by reference under FAR 52.252-2; this list reflects the high-frequency set for this NAICS, not an exhaustive flowdown.
What indirect-rate structure works for a federal contractor in NAICS 541620?: Hybrid services / field-equipment cost structure. Site overhead is real because field crews carry vehicle and sampling equipment burden separate from office staff. USACE EP 1110-1-8 equipment cost recovery applies on Corps task orders. Lab analysis costs flow through direct.
How does FieldLedger help small federal contractors in NAICS 541620?: Signed timekeeping plus equipment costing under USACE EP 1110-1-8 for field gear. Indirect Rate Engine handles the dual fringe / site-overhead structure. Project P&L tracks task orders against funding.

Sources

U.S. Census NAICS manual — census.gov/naics
SBA size-standards table — 13 C.F.R. § 121.201 (eCFR)
Federal obligations + prime awardees — USAspending.gov NAICS 541620
FAR / DFARS clause text — acquisition.gov

Snapshot date: 2026-05-08 (FY2024 reporting period). Federal-obligation bands and prime-contractor lists reflect the data as of the snapshot — refresh against USAspending.gov for current figures.