Top 65 Contractors in PSC F107: Hazardous Substance Analysis, Aug 2025–Jul 2026
Parent companies by net contract obligations Aug 1, 2025 – Jul 31, 2026 Code page on GovTribe
The latest 12 months. See the newest fiscal year's list: Top Contractors in PSC F107: Hazardous Substance Analysis, FY2025.
The top 10 won 67% of PSC F107 contract dollars from August 2025 through July 2026
Ranking facts
- Contract obligations
- $17,494,577 Net of deobligations, by contracts coded PSC F107
- Contractors
- 68 Parent companies with an obligation
- Largest contractor
- Calista Corp $2.55 million, 14.0% of obligations
- Data as of
Contract actions from FPDS (SAM.gov). How the rankings work · Download all 65 rows as CSV · Free to reuse with credit to GovTribe (CC BY 4.0)
Full ranking
| Rank | Contractor | Net obligations | Share | Trend |
|---|---|---|---|---|
| 1 |
Calista Corp
Top agencies
|
$2,551,325 | ||
| 2 | $1,741,213 | |||
| 3 | $1,418,389 | |||
| 4 |
Delaware Tribe of Indians
Top agencies
|
$1,323,838 | ||
| 5 | $1,191,196 | |||
| 6 | $964,953 | |||
| 7 |
Bluestone Interspec JV, LLC
Top agencies
|
$884,616 | ||
| 8 | $744,930 | |||
| 9 | $723,714 | |||
| 10 | $719,346 | |||
| 11 |
EA Engineering Science and Technology Inc. PBC
|
$527,828 | ||
| 12 | $506,822 | |||
| 13 | $503,150 | |||
| 14 | $433,000 | |||
| 15 |
Guidehouse Inc.
Top agencies
|
$273,952 | ||
| 16 |
Veritext LLC
Top agencies
|
$189,714 | ||
| 17 |
Research Planning, Inc.
Top agencies
|
$184,957 | ||
| 18 | $178,023 | |||
| 19 |
WSP USA Solutions Inc
Top agencies
|
$175,154 | ||
| 20 | $174,858 | |||
| 21 |
Kane Environmental, Inc.
Top agencies
|
$173,967 | ||
| 22 | $155,230 | |||
| 23 |
DH Environmental, Inc.
Top agencies
|
$141,921 | ||
| 24 | $119,366 | |||
| 25 |
HGS Engineering Inc.
Top agencies
|
$114,977 | ||
| 26 | $114,917 | |||
| 27 |
Wsp-Versar JV
Top agencies
|
$111,981 | ||
| 28 | $104,070 | |||
| 29 |
CIH Support LLC
Top agencies
|
$95,409 | ||
| 30 | $92,575 | |||
| 31 | $85,988 | |||
| 32 | $76,185 | |||
| 33 | $75,158 | |||
| 34 | $71,645 | |||
| 35 | $69,268 | |||
| 36 |
Pi3E JV LLP
Top agencies
|
$56,210 | ||
| 37 |
Clean Harbors Inc.
Top agencies
|
$53,808 | ||
| 38 | $50,981 | |||
| 39 | $46,258 | |||
| 40 |
First Environment Inc.
Top agencies
|
$45,966 | ||
| 41 |
Purdue University
Top agencies
|
$43,803 | ||
| 42 |
Pure Air UV Inc.
Top agencies
|
$40,848 | ||
| 43 | $32,736 | |||
| 44 |
Hair Enga
Top agencies
|
$32,505 | ||
| 45 | $26,856 | |||
| 46 |
Sage, LLC
Top agencies
|
$23,000 | ||
| 47 |
ENV Services Inc.
Top agencies
|
$22,830 | ||
| 48 | $20,291 | |||
| 49 |
Arcwood Environmental, LLC
Top agencies
|
$18,000 | ||
| 50 | $17,768 | |||
| 51 | $17,706 | |||
| 52 | $15,558 | |||
| 53 |
Gold Wave Inc.
Top agencies
|
$13,668 | ||
| 54 | $13,012 | |||
| 55 |
GLE Associates, Inc.
Top agencies
|
$11,666 | ||
| 56 | $10,500 | |||
| 57 |
Tech O. R., LLC
Top agencies
|
$9,454 | ||
| 58 |
Gel Laboratories LLC
Top agencies
|
$8,035 | ||
| 59 | $7,202 | |||
| 60 |
Keef Motions LLC
Top agencies
|
$6,880 | ||
| 61 |
Ecothink Group LLC
Top agencies
|
$6,000 | ||
| 62 |
CT Laboratories, LLC
Top agencies
|
$5,170 | ||
| 63 |
Ayuda Companies
Top agencies
|
$4,315 | ||
| 64 | $3,168 | |||
| 65 | $2,985 |
Show 40 more
65 of 68 contractors listed here. See the rest on GovTribe.
How this ranking works
- Source: every contract action FPDS records (as published on SAM.gov) in the period, as GovTribe received it.
- Amounts are net obligations: what was obligated, less what was deobligated. Shares are of $18.3 million obligated before deobligations, so they never pass 100%.
- Parent companies: each action counts under the ultimate parent its award record names, or under the awardee when it names none, so no dollar counts twice. An awardee whose own actions mostly name no parent, and that no other company's actions name as their parent, rolls up its SAM.gov registration's chain of parent companies: it counts under the first company there that other companies' actions name as their parent, or under the parent most of a company's own actions name, whichever comes first; with neither, under the highest company in the chain with federal contracts of its own. Joint ventures stay companies of their own. Parents of the same name (Inc., LLC and the like aside) count as one company, since FPDS records a company's parent under more than one UEI over time. GovTribe corrects a few parents and names by hand; see the corrections.
- Period: the trailing 12 months end with the last month that ended at least 90 days ago, because the Department of Defense reports its contract actions to FPDS about 90 days late. The list is rebuilt each night.
- Rank changes compare with Aug 2024–Jul 2025. "New" marks a company outside that period's top 500, and "Returned" one of those that was on an earlier fiscal year's list.
- Rank lines show each company's rank on every fiscal year's list since FY2021, #1 at the top, on a scale that gives the top of the list more room. A dashed stretch spans years it wasn't on the list.
- Placeholder recipients FPDS uses when it names no company ("Miscellaneous Foreign Contractors" and the like) aren't ranked.
Quick answers
Who were the top 10 PSC F107 contractors in Aug 2025–Jul 2026?
1. Calista Corp ($2.55M), 2. Engineering and Software System Solutions, Inc. ($1.74M), 3. Engineering/Remediation Resources Group Inc. ($1.42M), 4. Delaware Tribe of Indians ($1.32M), 5. Whitetail Environmental, LLC ($1.19M), 6. Association of Consultants and Engineers ($965K), 7. Bluestone Interspec JV, LLC ($885K), 8. Techlaw Consultants Inc. ($745K), 9. Anderson Environmental Contracting LLC ($724K), 10. Broadview Waste Solutions, Inc. ($719K).
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