Top GSA environmental consulting services contractors
In the 12 months ending Oct 5, 2026, the General Services Administration obligated $9.3M in net prime contract dollars under NAICS 541620, up 71.6% from $5.4M in the preceding 12 months. 17 prime contractors received positive obligations, and 5 of them accounted for 80% of that spend.
Prime contracts funded by the General Services Administration. Latest 12 months: Oct 6, 2025 to Oct 5, 2026. Source: USAspending.gov.
Obligations by fiscal year
Net prime contract obligations by federal fiscal year (October to September).
Top GSA contractors for NAICS 541620
Ranked by positive obligations in the latest 12 months. Share is of all positive obligations in this market.
| # | Contractor | Latest 12 mo | Prior 12 mo | Share | Rank change |
|---|---|---|---|---|---|
| 1 | Meca Consulting Inc | $4.3M | $30K | 46.0% | ▲ 18 |
| 2 | WSP USA Solutions Inc | $1.3M | $1.1M | 14.3% | — |
| 3 | Quaternary Resource Investigations, L.L.C. | $792K | −$289K | 8.5% | New |
| 4 | Occu-TEC Inc | $729K | $215K | 7.8% | ▲ 5 |
| 5 | Potomac-Hudson Engineering Inc | $499K | $1.2M | 5.3% | ▼ 4 |
| 6 | S.S. Papadopulos & Associates, Inc. | $460K | $417K | 4.9% | ▼ 1 |
| 7 | Mabbett & Associates, Inc. | $386K | $637K | 4.1% | ▼ 4 |
| 8 | Stantec Consulting Services Inc. | $287K | $592K | 3.1% | ▼ 4 |
| 9 | Eastern Research Group Inc | $223K | $288K | 2.4% | ▼ 2 |
| 10 | Trinity Consultants Inc | $190K | $183K | 2.0% | — |
| 11 | Terracon Consultants, Inc. | $88K | $0 | 0.9% | New |
| 12 | S & B Environmental LLC | $18K | $0 | 0.2% | New |
| 13 | Island Pump and Tank, LLC | $17K | $101K | 0.2% | — |
| 14 | Environmental Consulting Group, Inc. | $16K | $0 | 0.2% | New |
| 15 | Tetra Tech, Inc. | $9K | $17K | 0.1% | ▲ 7 |
What changed in the last 12 months
Contractors with the largest change in reported obligations versus the preceding 12 months.
Largest gains
- Meca Consulting Inc$30K → $4.3M (+$4.3M) · now #1
- Quaternary Resource Investigations, L.L.C.−$289K → $792K (+$1.1M) · now #3
- Occu-TEC Inc$215K → $729K (+$514K) · now #4
Largest declines
- Potomac-Hudson Engineering Inc$1.2M → $499K (−$687K) · now #5
- Burns & Mcdonnell Engineering Company, Inc.$405K → $0 (−$405K) · no latest-period obligations
- Stantec Consulting Services Inc.$592K → $287K (−$305K) · now #8
New to this market
1 contractors received their first obligations in this market (since FY2022) during the latest 12 months. The largest:
| Contractor | First obligation | Latest 12 mo |
|---|---|---|
| S & B Environmental LLC | Apr 16, 2026 | $18K |
Where the money comes from
Funding sub-agencies within the General Services Administration, latest 12 months. The funding organization can differ from the office that runs the requirement.
| Funding sub-agency | Latest 12 mo | Prior 12 mo | Change |
|---|---|---|---|
| Public Buildings Service | $9.3M | $5.4M | Up $4.0M (73.3%) |
Potential recompetes
Large awards in this market whose current period of performance ends in the next 18 months. Treat these as research leads: options, extensions, and follow-on vehicles often change the timing.
| Award | Incumbent | Obligated | Current end |
|---|---|---|---|
| 47PJ0022F0508 | S.S. Papadopulos & Associates, Inc. GRID BY GRID INSPECTION OF SE CORNER AT THE DENVER FEDERAL CENTER IN LAKEWOOD, COLORADO | $2.1M | Sep 30, 2027 |
| 47PJ0023F0429 | S.S. Papadopulos & Associates, Inc. AWARD IS FOR SITE WIDE ENVIRONMENTAL MONITORING AT THE DENVER FEDERAL CENTER IN LAKEWOOD, COLORADO. | $1.1M | Sep 30, 2027 |
| 47PH5326F0067 | Meca Consulting Inc AMERICAN SOCIETY OF HEATING, REFRIGERATING AND AIR-CONDITIONING ENGINEERS (ASHRAE) 188 WATER MANAGEMENT PLAN DEVELOPMENT. | $4.3M | Sep 30, 2027 |
Common questions
Who are the top GSA contractors for NAICS 541620?
In the latest 12 months, Meca Consulting Inc ($4.3M), WSP USA Solutions Inc ($1.3M), Quaternary Resource Investigations, L.L.C. ($792K) received the most GSA obligations for environmental consulting services.
How concentrated is this market?
The eight largest primes held 93.9% of positive obligations, and Meca Consulting Inc alone held 46.0%. 1 contractors won their first obligations in this market during the latest 12 months.
Are any large GSA NAICS 541620 contracts ending soon?
3 of the largest awards in this market reach their current end date in the next 18 months. The first is 47PJ0022F0508 (S.S. Papadopulos & Associates, Inc., $2.1M obligated), ending Sep 30, 2027. An end date is a research lead, not a confirmed recompete: options and extensions often move it.
Related markets
NAICS 541620 across all agencies
EPA · NAICS 541620
$287.8MDHS · NAICS 541620
$212.7MDoD · NAICS 541620
$170.4MCommerce · NAICS 541620
$92.1MInterior · NAICS 541620
$77.7MDOE · NAICS 541620
$77.2MNASA · NAICS 541620
$38.7MUSDA · NAICS 541620
$24.7MFigures are net obligations on prime contracts (award types A–D) from USAspending.gov, grouped by funding agency and the NAICS code on each award. Net obligations include deobligations and corrections, so they can differ from positive-obligation totals. See methodology.
Ready to connect your pursuit work?
GovEagle gives BD directors, capture managers, and proposal teams one AI workspace from pipeline through proposal, with CMMC/FedRAMP Certified compliance built in.