Federal Capture Intelligence

Top GSA environmental consulting services contractors (NAICS 541620)

Contract actions: October 1, 2021 – September 10, 2026 Updated September 11, 2026 General Services Administration agency guide NAICS 541620 · Environmental Consulting Services
Latest 12 months
$5.8M
Net obligations · Down $585.9K vs. $6.4M preceding
Prime contractors
18
With positive obligations in the latest 12 months

Research the GSA federal contracting market for environmental consulting services under NAICS 541620. Compare top federal contractors and market share, reported contract obligations and spending trends, funding-office attribution, recent award activity, and contract types, competition, and procurement methods.

Contract obligation trends for Environmental Consulting Services at the General Services Administration

Federal records show $46.2M in net obligations across 426 awards in Environmental Consulting Services at the General Services Administration from Oct 1, 2021 through Sep 10, 2026. This market accounts for 0.13% of $35.5B in agency-wide net prime contract obligations over the period shown. Latest 12-month net obligations decreased 9.1% from $6.4M to $5.8M. 5 prime contractors accounted for at least 80% of positive obligations in that latest period.

Fiscal-year activity

FY26 is year-to-date through Sep 10, 2026; earlier years show complete fiscal-year totals.

FY26 year-to-date: $4.5M versus $4.1M through the same date in FY25 (+9.5%).
Net obligations · complete fiscal yearNet obligations · FY26 YTDContract actions
View fiscal-year data table
Fiscal yearNet obligationsContract actionsCoverage
FY2022$11.7M321Complete
FY2023$13.2M283Complete
FY2024$11.4M265Complete
FY2025$5.4M209Complete
FY2026$4.5M63YTD through Sep 10, 2026

Market at a glance

All reported prime contract awards
All-period net obligations
$46.2M
426 awards · 95 prime contractors
Latest 12-month movement
−9.1%
$5.8M vs. $6.4M
Leading eight prime share
92.5%
Share held by the eight leading prime contractors in the latest 12 months
View agency share, denominators, and set-aside reporting
Agency context
0.13% of $35.5B in agency-wide net obligations.
Set-aside share when reported
60.0% of 130 awards with reported set-aside status.
Set-aside reporting
78 set aside · 52 no set-aside · 296 not reported

What changed in the last 12 months?

Sep 11, 2025–Sep 10, 2026, compared with Sep 11, 2024–Sep 10, 2025.

Competitive shifts

WSP USA SOLUTIONS INC gained the most market share
13.8%→27.7%+13.9 percentage points
The contractor now ranks #1 by positive obligations, based on 11 reported actions.

Market structure

Top-five contractor share increased
56.6%→80.3%+23.7 percentage points
Contractors outside the top five now account for 19.7% of positive obligations.
How these findings are calculated

Findings are selected from matched-period changes in obligations, share, rank, funding offices, concentration, reported set-asides, material award actions, and agency-peer outliers. Related signals are combined, and only material evidence-backed changes are shown. Review the full methodology.

Federal contract obligations by funding office

See how positive obligations were attributed across funding offices in the 12 months ending Sep 10, 2026.

17.6% of positive obligations were attributed to PBS R9 AMD CAPITAL PROJECTS. That represents $1.1M, up $812K from the preceding 12 months.

Latest 12-month share of positive obligations; the gray segment represents all other reported offices.

  1. PBS R9 AMD CAPITAL PROJECTS17.6% · $1.1M · up $812K
  2. PBS PROJECT DELIVERY WEST - BRANCH E16.0% · $999K · up $999K
  3. PBS R7 PROG SUPPORT - REGIONAL SUPPORT12.7% · $792K · up $662K
  4. PBS R5 ACQUISITION MANAGEMENT DIVISION11.6% · $722K · up $752K
  5. PBS R8 ACQUISITION MANAGEMENT DIVISION11.4% · $712K · down $893K
  6. All other reported offices30.8% of positive obligations
View reported office rankings, comparisons, and evidence

USAspending assigns each award to a funding office. That office may differ from the requiring activity, program office, contracting office, individual buyer, or actual customer.

  1. Reported funding office

    PBS R9 AMD CAPITAL PROJECTS

    #1Up 8 from #9

    Latest 12 months

    $1.1M

    17.6% of positive obligations

    Versus preceding 12 months

    +$812K

    1 active prime contractor · 1 award

    View office comparison and evidence

    Reported obligations increased 284.9% from $285K to $1.1M. The office’s share of positive obligations moved from 4.4% to 17.6%, a change of +13.1 percentage points.

    The latest period contains 2 actions across 1 award. The preceding period contained 2 active prime contractors and 2 awards.

  2. Reported funding office

    PBS PROJECT DELIVERY WEST - BRANCH E

    #2New to the positive-obligation ranking

    Latest 12 months

    $999K

    16.0% of positive obligations

    Versus preceding 12 months

    +$999K

    1 active prime contractor · 1 award

    View office comparison and evidence

    Reported obligations rose from $0 to $999K. The office’s share of positive obligations moved from 0% to 16.0%, a change of +16.0 percentage points.

    The latest period contains 1 action across 1 award and 1 newly active prime contractor. The preceding period contained 0 active prime contractors and 0 awards.

    Leading award-level changes

  3. Reported funding office

    PBS R7 PROG SUPPORT - REGIONAL SUPPORT

    #3Up 7 from #10

    Latest 12 months

    $792K

    12.7% of positive obligations

    Versus preceding 12 months

    +$662K

    1 active prime contractor · 2 awards

    View office comparison and evidence

    Reported obligations increased 507.3% from $130K to $792K. The office’s share of positive obligations moved from 2.0% to 12.7%, a change of +10.7 percentage points.

    The latest period contains 2 actions across 2 awards. The preceding period contained 1 active prime contractor and 10 awards.

  4. Reported funding office

    PBS R5 ACQUISITION MANAGEMENT DIVISION

    #4New to the positive-obligation ranking

    Latest 12 months

    $722K

    11.6% of positive obligations

    Versus preceding 12 months

    +$752K

    2 active prime contractors · 3 awards

    View office comparison and evidence

    Reported obligations moved from $29K in net deobligations to $722K in net obligations. The office’s share of positive obligations moved from 0% to 11.6%, a change of +11.6 percentage points.

    The latest period contains 3 actions across 3 awards and 1 newly active prime contractor. The preceding period contained 4 active prime contractors and 5 awards.

  5. Reported funding office

    PBS R8 ACQUISITION MANAGEMENT DIVISION

    #5Down 4 from #1

    Latest 12 months

    $712K

    11.4% of positive obligations

    Versus preceding 12 months

    −$893K

    6 active prime contractors · 9 awards

    View office comparison and evidence

    Reported obligations decreased 55.6% from $1.6M to $712K. The office’s share of positive obligations moved from 24.9% to 11.4%, a change of −13.5 percentage points.

    The latest period contains 9 actions across 9 awards and 1 newly active prime contractor. The preceding period contained 8 active prime contractors and 16 awards.

    Leading award-level changes

  6. Reported funding office

    PBS R11 SPECIAL PROGRAMS DIVISION ACQUISITION REGIONAL SUPPORT

    #6Down 2 from #4

    Latest 12 months

    $334K

    5.3% of positive obligations

    Versus preceding 12 months

    −$244K

    3 active prime contractors · 5 awards

    View office comparison and evidence

    Reported obligations decreased 42.2% from $578K to $334K. The office’s share of positive obligations moved from 9.0% to 5.3%, a change of −3.6 percentage points.

    The latest period contains 7 actions across 5 awards and 1 newly active prime contractor. The preceding period contained 5 active prime contractors and 16 awards.

  7. Reported funding office

    PBS PROJECT DELIVERY CENTRAL - BRANCH B

    #7New to the positive-obligation ranking

    Latest 12 months

    $311K

    5.0% of positive obligations

    Versus preceding 12 months

    +$311K

    1 active prime contractor · 3 awards

    View office comparison and evidence

    Reported obligations rose from $0 to $311K. The office’s share of positive obligations moved from 0% to 5.0%, a change of +5.0 percentage points.

    The latest period contains 3 actions across 3 awards and 1 newly active prime contractor. The preceding period contained 0 active prime contractors and 0 awards.

  8. Reported funding office

    PBS R1 NATIONAL CONTRACTS TEAM

    #8Down 1 from #7

    Latest 12 months

    $241K

    3.9% of positive obligations

    Versus preceding 12 months

    −$227K

    3 active prime contractors · 5 awards

    View office comparison and evidence

    Reported obligations decreased 48.5% from $468K to $241K. The office’s share of positive obligations moved from 7.3% to 3.9%, a change of −3.4 percentage points.

    The latest period contains 11 actions across 5 awards. The preceding period contained 5 active prime contractors and 9 awards.

  9. Reported funding office

    PBS R4 AMD CAPITAL/AE BRANCH

    #9Up 4 from #13

    Latest 12 months

    $239K

    3.8% of positive obligations

    Versus preceding 12 months

    +$163K

    1 active prime contractor · 1 award

    View office comparison and evidence

    Reported obligations increased 212.2% from $77K to $239K. The office’s share of positive obligations moved from 1.2% to 3.8%, a change of +2.6 percentage points.

    The latest period contains 3 actions across 1 award. The preceding period contained 1 active prime contractor and 1 award.

  10. Reported funding office

    PBS R11 BUILDING SERVICES DIVISION CENTER 3

    #10Down 7 from #3

    Latest 12 months

    $221K

    3.5% of positive obligations

    Versus preceding 12 months

    −$388K

    1 active prime contractor · 2 awards

    View office comparison and evidence

    Reported obligations decreased 63.7% from $608K to $221K. The office’s share of positive obligations moved from 9.4% to 3.5%, a change of −5.9 percentage points.

    The latest period contains 2 actions across 2 awards. The preceding period contained 1 active prime contractor and 3 awards.

  11. Reported funding office

    PBS R7 PROG SUPPORT - CAPITAL AND IDIQ

    #11Down 6 from #5

    Latest 12 months

    $179K

    2.9% of positive obligations

    Versus preceding 12 months

    −$372K

    1 active prime contractor · 1 award

    View office comparison and evidence

    Reported obligations decreased 67.6% from $551K to $179K. The office’s share of positive obligations moved from 8.5% to 2.9%, a change of −5.7 percentage points.

    The latest period contains 3 actions across 1 award. The preceding period contained 1 active prime contractor and 1 award.

  12. Reported funding office

    PBS R6 CONSTRUCTION ACQUISITION BRANCH

    No positive-obligation rank

    Latest 12 months

    $0

    0% of positive obligations

    Versus preceding 12 months

    −$645K

    2 active prime contractors · 3 awards

    View office comparison and evidence

    Reported obligations decreased 100.0% from $645K to $0. The office’s share of positive obligations moved from 10.0% to 0%, a change of −10.0 percentage points.

    The latest period contains 7 actions across 3 awards. The preceding period contained 3 active prime contractors and 11 awards.

  13. Reported funding office

    PBS OFFICE OF ACQUISITION MANAGEMENT

    No positive-obligation rank

    Latest 12 months

    −$367K

    0% of positive obligations

    Versus preceding 12 months

    −$856K

    1 active prime contractor · 1 award

    View office comparison and evidence

    Reported obligations moved from $490K in net obligations to $367K in net deobligations. The office’s share of positive obligations moved from 7.6% to 0%, a change of −7.6 percentage points.

    The latest period contains 1 action across 1 award. The preceding period contained 1 active prime contractor and 1 award.

Contract types, competition, and procurement methods

From Sep 11, 2025 through Sep 10, 2026, 29 awards had positive obligations totaling $6.3M. Subject to Multiple Award Fair Opportunity was the leading reported procedure, accounting for 78.7% of positive obligations. Awards with a reported parent IDV accounted for 96.3%.

Leading award type
51.6%
BPA Call
Leading reported procedure
78.7%
Subject to Multiple Award Fair Opportunity
Reported parent IDV
96.3%
of positive obligations had a reported parent IDV
Median reported offers
1
20 of 29 awards reported offers

Buying method changes

Compared with Sep 11, 2024–Sep 10, 2025. Based on 29 current awards and 65 preceding awards with positive net obligations.

Median positive award obligations
$122K
Up from $53K in the preceding period
Delivery-order obligation share
44.7%
Down from 57.1% in the preceding period
How to read these changes

Directional color and the Up or Down labels show historical movement only. Green does not mean favorable and red does not mean unfavorable; neither predicts a future procurement method.

Same-NAICS comparison

Compared with the NAICS 541620 peer median, parent-IDV obligation share is 17.5 percentage points higher, reported full-and-open obligation share is 38.4 percentage points higher, delivery-order obligation share is 15.3 percentage points lower, and median positive award obligations are 20.8% lower.

MeasureThis marketPeer medianDifference
Parent-IDV obligation share96.3%78.7%+17.5 pts
Reported full-and-open obligation share78.7%40.3%+38.4 pts
Delivery-order obligation share44.7%60.0%-15.3 pts
Median positive award obligations$122K$154K-20.8%
Peer cohort and comparison limits

The peer median gives each of the 12 eligible agency markets equal weight. The included agency markets are:

Agency mission, scale, and acquisition context can differ. Peer position does not establish market attractiveness or predict a future procurement method.

View buying-method details and data coverage

Award types

Reported valueAwardsPositive obligationsShare
BPA Call(A)10$3.2M51.6%
Delivery Order(C)13$2.8M44.7%
Definitive Contract(D)4$199K3.2%
Purchase Order(B)2$35K0.56%

Reported parent-award types

Reported valueAwardsPositive obligationsShare
BPA(E)10$3.2M51.6%
FSS(C)9$2.3M36.1%
IDC(B)4$540K8.6%
Not reported6$234K3.7%

Single- or multiple-award parent structure

Reported valueAwardsPositive obligationsShare
Multiple Award(M)15$3.7M59.8%
Single Award(S)8$2.3M36.4%
Not reported6$234K3.7%

Solicitation procedures

Reported valueAwardsPositive obligationsShare
Subject to Multiple Award Fair Opportunity(MAFO)15$4.9M78.7%
Negotiated Proposal/Quote(NP)4$540K8.6%
Mafo(SUBJECT TO MULTIPLE AWARD FAIR OPPORTUNITY)3$538K8.6%
Sss(ONLY ONE SOURCE)3$144K2.3%
Simplified Acquisition(SP1)3$94K1.5%
Sp1(SIMPLIFIED ACQUISITION)1$17K0.28%

Extent competed

Reported valueAwardsPositive obligationsShare
Full and Open Competition(A)15$4.9M78.7%
Full and Open Competition After Exclusion of Sources(D)4$540K8.6%
A(FULL AND OPEN COMPETITION)3$538K8.6%
B(NOT AVAILABLE FOR COMPETITION)1$122K1.9%
Not Competed Under SAP(G)1$62K0.99%
Competed Under SAP(F)2$31K0.50%
Other reported values3$39K0.63%

Fair-opportunity and limited-source reporting

Reported valueAwardsPositive obligationsShare
Fair Opportunity Given(FAIR)13$3.1M50.2%
Competitive Set Aside(CSA)3$1.8M29.2%
Follow-on Action Following Competitive Initial Action(FOO)1$409K6.5%
Only One Source - Other(ONE)1$88K1.4%
Not reported11$794K12.7%

Other-than-full-and-open reasons

Reported valueAwardsPositive obligationsShare
Authorized by Statute (FAR 6.302-5(A)(2)(I))(OTH)1$122K1.9%
SAP Non-Competition (FAR 13)(SP2)2$79K1.3%
Only One Source-Other (FAR 6.302-1 Other)(ONE)1$18K0.29%
Unique Source (FAR 6.302-1(B)(1))(UNQ)1$4K0.070%
Not reported24$6.0M96.4%

Contract pricing types

Reported valueAwardsPositive obligationsShare
Firm Fixed Price(J)22$5.6M88.8%
J(FIRM FIXED PRICE)7$699K11.2%

Product or Service Codes

Reported valueAwardsPositive obligationsShare
Other Environmental Services(F999)6$2.4M38.4%
Special Studies/Analysis- Environmental Assessments(B510)4$1.2M19.9%
Environmental Systems Protection- Environmental Consulting and Legal Support(F115)1$1.1M17.5%
Inspection- Miscellaneous(H399)5$602K9.6%
Environmental Systems Protection- Environmental Remediation(F108)2$317K5.1%
Support- Professional: Other(R499)2$210K3.4%
Other reported values9$388K6.2%

Awarding subagencies

Reported valueAwardsPositive obligationsShare
Public Buildings Service(4740)29$6.3M100.0%

Awarding offices

Reported valueAwardsPositive obligationsShare
Pbs R9 Amd Capital Projects(47PK01)1$1.1M17.5%
Pbs Project Delivery West - Branch E(47PD55)1$999K15.9%
Pbs R7 Prog Support - Regional Support(47PH10)1$792K12.7%
Pbs R8 Acquisition Management Division(47PJ00)3$727K11.6%
Pbs Project Delivery West - Branch C(47PD53)1$706K11.3%
Pbs R11 Special Programs Division Acquisition Regional Support(47PM09)3$335K5.3%
Other reported values19$1.6M25.6%

Reported parent IDVs

Reported valueAwardsPositive obligationsShare
47PJ0020A0007(4740)2$1.4M22.5%
47QRAA18D0074(4732)2$1.3M21.3%
47PH0819A0001(4740)1$792K12.7%
47PG1025A0001(4740)2$729K11.6%
47PM1122D0001(4740)4$540K8.6%
47QRAA22D0037(4732)2$317K5.1%
47PM0323A0001(4740)1$221K3.5%
47QRAA18D002R(4732)1$199K3.2%
Other reported values8$486K7.8%
Not reported6$234K3.7%

Offers, award size, and timing

Median reported offers
1 median
20 reported · 9 not reported
Positive award obligations
$122K median
$20K–$221K middle 50%
Reported performance period
365 days (~12 months) median
29 reported · 0 not reported

Calculations group latest-period actions by award, retain awards with positive net obligations for share denominators, and use each award's latest reported USAspending procurement fields as of Sep 10, 2026. Blank competition, pricing, PSC, or parent-IDV values remain not reported; they are not inferred. Offer counts must be positive and below the FPDS 999 placeholder. Awarding organizations can differ from the funding agency that defines this page.

Top federal contractors

Latest 12-month market share, concentration, and complete prime contractor rankings across the period shown.

Prime contractor concentration
5 of 18prime contractors account for at least 80% of positive obligations in the last 12 months
Largest prime contractor
27.7%of positive obligations in the last 12 months
Leading four prime contractors
70.0%of positive obligations in the last 12 months
Leading eight prime contractors
92.5%of positive obligations in the last 12 months

Based on $5.9M in positive obligations during the 12 months ending Sep 10, 2026. Individual shares and movement appear in the searchable rankings below. Movement compares with Sep 11, 2024–Sep 10, 2025.

Last 12mo obligation volume: Highest positive obligations first; net deobligations follow by magnitude; contractors with no activity in the last 12 months follow by all-period obligations. Ranks use the complete contractor list and remain fixed when search narrows the results.

15 leading contractors
  1. #1

    Last 12mo obligations

    $1.6M

    27.7%

    Dollar movement

    +$735K

    vs. prior 12 months

    Last 12mo awards

    7 awards

    11 actions

    Historical and award details for WSP USA SOLUTIONS INC
    Obligations: prior → latest
    $898K → $1.6M
    +81.8%
    Share: prior → latest
    13.8% → 27.7%
    +13.9 percentage points
    All-period obligations
    $5.5M
    11.8% of all-period positive obligations · 18 awards
    Recorded activity
    Since Feb 22, 2022
    through Apr 15, 2026

    Award reporting

    Latest and prior 12-month award reporting
    Reported award evidenceLatestPrior
    Reported set-aside00
    Reported no set-aside00
    Not reported710
    Reported small business00
    All-period set-aside types

    None reported.

  2. #2

    Last 12mo obligations

    $969K

    16.4%

    Dollar movement

    +$5K

    vs. prior 12 months

    Last 12mo awards

    4 awards

    7 actions

    Historical and award details for POTOMAC-HUDSON ENGINEERING INC
    Obligations: prior → latest
    $964K → $969K
    +0.5%
    Share: prior → latest
    14.8% → 16.4%
    +1.6 percentage points
    All-period obligations
    $4.7M
    10.1% of all-period positive obligations · 13 awards
    Recorded activity
    Since Oct 26, 2021
    through Jul 16, 2026

    Award reporting

    Latest and prior 12-month award reporting
    Reported award evidenceLatestPrior
    Reported set-aside11
    Reported no set-aside00
    Not reported33
    Reported small business44
    All-period set-aside types
    • 2 · Total small business
  3. #3

    Last 12mo obligations

    $792K

    13.4%

    Dollar movement

    +$662K

    vs. prior 12 months

    Last 12mo awards

    2 awards

    2 actions

    Historical and award details for QUATERNARY RESOURCE INVESTIGATIONS, L.L.C.
    Obligations: prior → latest
    $130K → $792K
    +507.3%
    Share: prior → latest
    2.0% → 13.4%
    +11.4 percentage points
    All-period obligations
    $5.7M
    12.2% of all-period positive obligations · 53 awards
    Recorded activity
    Since Oct 13, 2021
    through Jan 23, 2026

    Award reporting

    Latest and prior 12-month award reporting
    Reported award evidenceLatestPrior
    Reported set-aside00
    Reported no set-aside00
    Not reported210
    Reported small business210
    All-period set-aside types

    None reported.

  4. #4

    Last 12mo obligations

    $729K

    12.4%

    Dollar movement

    +$514K

    vs. prior 12 months

    Last 12mo awards

    2 awards

    4 actions

    Historical and award details for OCCU-TEC INC
    Obligations: prior → latest
    $215K → $729K
    +238.6%
    Share: prior → latest
    3.3% → 12.4%
    +9.1 percentage points
    All-period obligations
    $944K
    2.0% of all-period positive obligations · 4 awards
    Recorded activity
    Since Dec 5, 2024
    through Jun 12, 2026

    Award reporting

    Latest and prior 12-month award reporting
    Reported award evidenceLatestPrior
    Reported set-aside00
    Reported no set-aside00
    Not reported22
    Reported small business22
    All-period set-aside types

    None reported.

  5. #5

    Last 12mo obligations

    $613K

    10.4%

    Dollar movement

    +$267K

    vs. prior 12 months

    Last 12mo awards

    7 awards

    7 actions

    Historical and award details for MABBETT & ASSOCIATES, INC.
    Obligations: prior → latest
    $346K → $613K
    +77.2%
    Share: prior → latest
    5.3% → 10.4%
    +5.1 percentage points
    All-period obligations
    $4.5M
    9.7% of all-period positive obligations · 37 awards
    Recorded activity
    Since Oct 26, 2021
    through Jul 22, 2026

    Award reporting

    Latest and prior 12-month award reporting
    Reported award evidenceLatestPrior
    Reported set-aside11
    Reported no set-aside12
    Not reported59
    Reported small business712
    All-period set-aside types
    • 1 · SDVOSB set-aside
  6. #6

    Last 12mo obligations

    $317K

    5.4%

    Dollar movement

    −$349K

    vs. prior 12 months

    Last 12mo awards

    2 awards

    2 actions

    Historical and award details for S.S. PAPADOPULOS & ASSOCIATES, INC.
    Obligations: prior → latest
    $667K → $317K
    −52.4%
    Share: prior → latest
    10.2% → 5.4%
    −4.9 percentage points
    All-period obligations
    $5.0M
    10.7% of all-period positive obligations · 5 awards
    Recorded activity
    Since Oct 27, 2021
    through Aug 31, 2026

    Award reporting

    Latest and prior 12-month award reporting
    Reported award evidenceLatestPrior
    Reported set-aside00
    Reported no set-aside00
    Not reported22
    Reported small business22
    All-period set-aside types

    None reported.

  7. #7

    Last 12mo obligations

    $221K

    3.8%

    Dollar movement

    −$388K

    vs. prior 12 months

    Last 12mo awards

    2 awards

    2 actions

    Historical and award details for EASTERN RESEARCH GROUP INC
    Obligations: prior → latest
    $608K → $221K
    −63.7%
    Share: prior → latest
    9.3% → 3.8%
    −5.6 percentage points
    All-period obligations
    $1.4M
    2.9% of all-period positive obligations · 5 awards
    Recorded activity
    Since Nov 8, 2021
    through Aug 20, 2026

    Award reporting

    Latest and prior 12-month award reporting
    Reported award evidenceLatestPrior
    Reported set-aside00
    Reported no set-aside00
    Not reported23
    Reported small business00
    All-period set-aside types

    None reported.

  8. #8

    Last 12mo obligations

    $179K

    3.0%

    Dollar movement

    −$372K

    vs. prior 12 months

    Last 12mo awards

    1 award

    3 actions

    Historical and award details for STANTEC CONSULTING SERVICES INC.
    Obligations: prior → latest
    $551K → $179K
    −67.6%
    Share: prior → latest
    8.5% → 3.0%
    −5.4 percentage points
    All-period obligations
    $503K
    1.1% of all-period positive obligations · 3 awards
    Recorded activity
    Since Nov 8, 2021
    through Jul 24, 2026

    Award reporting

    Latest and prior 12-month award reporting
    Reported award evidenceLatestPrior
    Reported set-aside00
    Reported no set-aside00
    Not reported11
    Reported small business00
    All-period set-aside types

    None reported.

  9. #9

    Last 12mo obligations

    $122K

    2.1%

    Dollar movement

    −$1K

    vs. prior 12 months

    Last 12mo awards

    1 award

    2 actions

    Historical and award details for CEDARVILLE ENGINEERING GROUP LLC
    Obligations: prior → latest
    $123K → $122K
    −0.9%
    Share: prior → latest
    1.9% → 2.1%
    +0.2 percentage points
    All-period obligations
    $289K
    0.62% of all-period positive obligations · 2 awards
    Recorded activity
    Since Jun 17, 2024
    through Sep 1, 2026

    Award reporting

    Latest and prior 12-month award reporting
    Reported award evidenceLatestPrior
    Reported set-aside12
    Reported no set-aside00
    Not reported00
    Reported small business12
    All-period set-aside types
    • 2 · 8(a) sole source
  10. #10

    Last 12mo obligations

    $95K

    1.6%

    Dollar movement

    +$42K

    vs. prior 12 months

    Last 12mo awards

    1 award

    4 actions

    Historical and award details for STANTEC CONSULTING SERVICES INC
    Obligations: prior → latest
    $53K → $95K
    +78.2%
    Share: prior → latest
    0.82% → 1.6%
    +0.8 percentage points
    All-period obligations
    $149K
    0.32% of all-period positive obligations · 1 award
    Recorded activity
    Since Nov 2, 2021
    through May 28, 2026

    Award reporting

    Latest and prior 12-month award reporting
    Reported award evidenceLatestPrior
    Reported set-aside00
    Reported no set-aside00
    Not reported11
    Reported small business00
    All-period set-aside types

    None reported.

  11. #11

    Last 12mo obligations

    $88K

    1.5%

    Dollar movement

    +$88K

    vs. prior 12 months

    Last 12mo awards

    1 award

    1 action

    Historical and award details for TERRACON CONSULTANTS, INC.
    Obligations: prior → latest
    $0 → $88K
    Not comparable
    Share: prior → latest
    0% → 1.5%
    +1.5 percentage points
    All-period obligations
    $96K
    0.21% of all-period positive obligations · 3 awards
    Recorded activity
    Since Oct 20, 2021
    through Jul 31, 2026

    Award reporting

    Latest and prior 12-month award reporting
    Reported award evidenceLatestPrior
    Reported set-aside00
    Reported no set-aside00
    Not reported10
    Reported small business00
    All-period set-aside types

    None reported.

  12. #12

    Last 12mo obligations

    $44K

    0.75%

    Dollar movement

    +$31K

    vs. prior 12 months

    Last 12mo awards

    1 award

    3 actions

    Historical and award details for WINDJAMMER ENVIRONMENTAL LLC
    Obligations: prior → latest
    $13K → $44K
    +233.3%
    Share: prior → latest
    0.20% → 0.75%
    +0.6 percentage points
    All-period obligations
    $58K
    0.12% of all-period positive obligations · 2 awards
    Recorded activity
    Since Sep 25, 2024
    through Apr 22, 2026

    Award reporting

    Latest and prior 12-month award reporting
    Reported award evidenceLatestPrior
    Reported set-aside00
    Reported no set-aside00
    Not reported11
    Reported small business11
    All-period set-aside types

    None reported.

  13. #13

    Last 12mo obligations

    $20K

    0.34%

    Dollar movement

    −$116K

    vs. prior 12 months

    Last 12mo awards

    2 awards

    3 actions

    Historical and award details for MECA CONSULTING INC
    Obligations: prior → latest
    $136K → $20K
    −85.1%
    Share: prior → latest
    2.1% → 0.34%
    −1.8 percentage points
    All-period obligations
    $687K
    1.5% of all-period positive obligations · 11 awards
    Recorded activity
    Since Nov 4, 2021
    through Apr 14, 2026

    Award reporting

    Latest and prior 12-month award reporting
    Reported award evidenceLatestPrior
    Reported set-aside10
    Reported no set-aside01
    Not reported13
    Reported small business24
    All-period set-aside types
    • 1 · Total small business
  14. #14

    Last 12mo obligations

    $18K

    0.30%

    Dollar movement

    +$18K

    vs. prior 12 months

    Last 12mo awards

    1 award

    4 actions

    Historical and award details for S & B ENVIRONMENTAL LLC
    Obligations: prior → latest
    $0 → $18K
    Not comparable
    Share: prior → latest
    0% → 0.30%
    +0.3 percentage points
    All-period obligations
    $18K
    0.040% of all-period positive obligations · 1 award
    Recorded activity
    Since Apr 16, 2026
    through Sep 3, 2026

    Award reporting

    Latest and prior 12-month award reporting
    Reported award evidenceLatestPrior
    Reported set-aside00
    Reported no set-aside10
    Not reported00
    Reported small business10
    All-period set-aside types

    None reported.

  15. #15

    Last 12mo obligations

    $17K

    0.29%

    Dollar movement

    −$84K

    vs. prior 12 months

    Last 12mo awards

    1 award

    2 actions

    Historical and award details for ISLAND PUMP AND TANK, LLC
    Obligations: prior → latest
    $101K → $17K
    −82.8%
    Share: prior → latest
    1.6% → 0.29%
    −1.3 percentage points
    All-period obligations
    $156K
    0.34% of all-period positive obligations · 2 awards
    Recorded activity
    Since Dec 20, 2023
    through Aug 21, 2026

    Award reporting

    Latest and prior 12-month award reporting
    Reported award evidenceLatestPrior
    Reported set-aside00
    Reported no set-aside11
    Not reported00
    Reported small business00
    All-period set-aside types

    None reported.

Recent federal contract award activity

Recent contract actions with unusually large obligation changes or meaningful shifts in contractor and funding-office activity.

Base award

This action

+$999K

WSP USA SOLUTIONS INC

PBS PROJECT DELIVERY WEST - BRANCH E

ND0501AK AND 70 OTHER LOCATIONS IN FORMER R8, R9, R10 INCLUDING ENVIRONMENTAL, FIRE, AND OTHER HYGIENE SURVEYS FOR ALL FEDERAL FACILITIES

Why it stands out

One action represented 16.9% of the market’s latest 12-month positive obligations.

At $999K, the action was large enough to materially affect the latest 12-month market picture.

Award net obligations
$999K
Share of 12-month positive obligations
16.9%
Supporting data
Prime contractor
#1 · 27.7% share
up 1 rank · +13.9 percentage points · $735K net increase; action exceeded it by $264K
Funding office
#2 · 16.0% attributed share
+16.0 percentage points · $999K net increase; action accounted for 100.0%
Related:Largest share gain
PIID 47PD5526F0088
Base award

This action

+$706K

OCCU-TEC INC

PBS R5 ACQUISITION MANAGEMENT DIVISION

THE BANNISTER COMPLEX FY26 YEAR 1 PERMIT REQUIREMENTS WILL BE PERFORMED AT THE BANNISTER FEDERAL COMPLEX IN 2306-2312 BANNISTER ROAD KANSAS CITY, MISSOURI.

Why it stands out

The contractor climbed 5 positions in this market.

It now ranks #4 by positive obligations over the latest 12 months.

Award net obligations
$706K
Share of 12-month positive obligations
12.0%
Supporting data
Prime contractor
#4 · 12.4% share
up 5 ranks · +9.1 percentage points · $514K net increase; action exceeded it by $193K
Funding office
#4 · 11.6% attributed share
+11.6 percentage points · $752K net increase; action accounted for 94.0%
PIID 47PD5326F0078
Modification

This action

+$792K

QUATERNARY RESOURCE INVESTIGATIONS, L.L.C.

PBS R7 PROG SUPPORT - REGIONAL SUPPORT

THE PURPOSE OF THIS MOD IS TO ADD IN-SCOPE TASKS NECESSARY DUE TO INITIAL FINDINGS. THE PRICE WILL GO FROM: $250,240.00 TO: $1,042,166.00. THE MOD INCLUDES A TIME EXTENSION OF 284 DAYS. THE END DATE WILL GO FROM: 4/18/25 TO: 1/27/26

Why it stands out

The contractor climbed 11 positions in this market.

It now ranks #3 by positive obligations over the latest 12 months.

Award net obligations
$1.0M
Share of 12-month positive obligations
13.4%
Supporting data
Prime contractor
#3 · 13.4% share
up 11 ranks · +11.4 percentage points · $662K net increase; action exceeded it by $130K
Funding office
#3 · 12.7% attributed share
up 7 ranks · +10.7 percentage points · $662K net increase; action exceeded it by $130K
PIID 47PH1023F0043 · Mod PS0005
Base award

This action

+$837K

POTOMAC-HUDSON ENGINEERING INC

PBS R9 AMD CAPITAL PROJECTS

ENVIRONMENTAL IMPACT STUDY FOR NOGALES-DECONCINI LPOE

Why it stands out

The funding office climbed 8 positions in attributed spending.

It now ranks #1 in attributed spending.

Award net obligations
$1.1M
Share of 12-month positive obligations
14.2%
Supporting data
Funding office
#1 · 17.6% attributed share
up 8 ranks · +13.1 percentage points · $812K net increase; action exceeded it by $25K
PIID 47PK0125F0025
Base award

This action

+$229K

MABBETT & ASSOCIATES, INC.

PBS R11 SPECIAL PROGRAMS DIVISION ACQUISITION REGIONAL SUPPORT

FY26 CCC REPORTS TASK ORDER #4 - PERIOD OF PERFORMANCE: OCTOBER 1, 2025 THROUGH APRIL 30, 2026

Why it stands out

The contractor climbed 2 positions in this market.

It now ranks #5 by positive obligations over the latest 12 months.

Award net obligations
$229K
Share of 12-month positive obligations
3.9%
Supporting data
Prime contractor
#5 · 10.4% share
up 2 ranks · +5.1 percentage points · $267K net increase; action accounted for 85.8%
Funding office
#6 · 5.3% attributed share
$244K net decline despite this positive action
PIID 47PM0925F0032
Modification

This action

+$221K

EASTERN RESEARCH GROUP INC

PBS R11 BUILDING SERVICES DIVISION CENTER 3

MODIFICATION PO0003 EXERCISES OPTION YEAR 3 FOR THE PERIOD OF 10/1/2026 - 9/30/2027 FOR STORMWATER REGULATORY COMPLIANCE SUPPORT SERVICES AT 30 LOCATIONS IN WASHINGTON, D.C. UNDER BPA 47PM0323A0001 BPA CALL 47PM0323F0056

Why it stands out

This award grew while spending attributed to its office declined.

The modification added $221K while office-attributed obligations fell $388K overall.

Award net obligations
$939K
Share of 12-month positive obligations
3.8%
Supporting data
Prime contractor
#7 · 3.8% share
$388K net decline despite this positive action
Funding office
#10 · 3.5% attributed share
$388K net decline despite this positive action
PIID 47PM0323F0056 · Mod PO0003
View recent award activity by date (10)
  1. S.S. PAPADOPULOS & ASSOCIATES, INC.Modification · PIID 47PJ0022F0508
    Action+$176K
    Award net obligations$1.9M
  2. S.S. PAPADOPULOS & ASSOCIATES, INC.Modification · PIID 47PJ0023F0429
    Action+$142K
    Award net obligations$1.1M
  3. ISLAND PUMP AND TANK, LLCModification · PIID 47PC0425P0003
    Action+$17K
    Award net obligations$119K
  4. EASTERN RESEARCH GROUP INCModification · PIID 47PM0323F0056
    Action+$221K
    Award net obligations$939K
  5. HP ENVIRONMENTAL, INCModification · PIID 47PM0623C0009
    Action+$4K
    Award net obligations$16K
  6. TERRACON CONSULTANTS, INC.Base award · PIID 47PB5326F0008
    Action+$88K
    Award net obligations$88K
  7. STANTEC CONSULTING SERVICES INC.Modification · PIID 47PH0825F0015
    Action+$179K
    Award net obligations$730K
  8. MABBETT & ASSOCIATES, INC.Base award · PIID 47PE5226F0224
    Action+$10K
    Award net obligations$10K
  9. POTOMAC-HUDSON ENGINEERING INCModification · PIID 47PK0125F0025
    Action+$260K
    Award net obligations$1.1M
  10. BIOHABITATS INCDeobligation · PIID 47PB0123C0002
    Action−$302
    Award net obligations$167K

GSA environmental consulting services market FAQs

Answers based on reported federal contract data.

Who are the top GSA environmental consulting services contractors?

In the 12 months through September 10, 2026, WSP USA SOLUTIONS INC, POTOMAC-HUDSON ENGINEERING INC, and QUATERNARY RESOURCE INVESTIGATIONS, L.L.C. were the leading GSA environmental consulting services prime contractors by positive obligations.

  1. #1

    WSP USA SOLUTIONS INC

    $1,632,869 in positive obligations

  2. #2

    POTOMAC-HUDSON ENGINEERING INC

    $969,265 in positive obligations

  3. #3

    QUATERNARY RESOURCE INVESTIGATIONS, L.L.C.

    $791,926 in positive obligations

Rankings use reported USAspending award data.

Did GSA contract obligations decrease in the environmental consulting services market?

Yes. Measured by net prime contract obligations, reported GSA activity in the environmental consulting services market decreased 9.1% from $6,418,848 in the preceding 12 months to $5,832,934 in the 12 months through September 10, 2026.

Latest 12 months
$5,832,934
Net prime contract obligations
Preceding 12 months
$6,418,848
Net prime contract obligations
Change
−9.1%
Between matched 12-month periods

Reported contract actions, not outlays or a forecast.

What recent GSA contract award activity was reported in the environmental consulting services market?

Recent GSA contract award activity reported in the environmental consulting services market included actions for WSP USA SOLUTIONS INC, OCCU-TEC INC, and QUATERNARY RESOURCE INVESTIGATIONS, L.L.C. during the 12 months through September 10, 2026.

Action obligations are transaction-level amounts, not current award-level obligations.

Which procurement methods were reported for GSA contracts under NAICS 541620?

From September 11, 2025 through September 10, 2026, GSA reported 29 positive-obligation awards for environmental consulting services under NAICS 541620. The leading award type was BPA call. The leading reported procedure was subject to multiple award fair opportunity.

Positive-obligation awards
29
Leading reported procedure
Subject to Multiple Award Fair Opportunity
78.7% of positive obligations
Leading award type
BPA Call
51.6% of positive obligations
Full and open
78.7%
of positive obligations
Reported parent IDV
96.3%
of positive obligations

Percentages use positive obligations as the denominator.

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Related market research

Complete market indexes:

Same NAICS at other agencies:

Nearby NAICS at this agency:

Markets sharing leading prime records:

Leading-prime vehicle memberships:

Company memberships do not establish award-channel use.

Reported obligations include contract actions from October 1, 2021 through September 10, 2026. Set-aside and business-size fields reflect award records, not a contractor's current eligibility.

Review data methodology