Top 34 Contractors in PSC B502: Air Quality Analysis, FY2025

Full ranking

Rank	Contractor	Net obligations	Share	Trend
1	University of California, Davis Top agencies DOI (Department of the Interior)	$2,783,301	28.8%	Rank history: not on the FY2021–FY2024 lists; new.
2	Air Resource Specialists, Inc. Top agencies DOI (Department of the Interior)	$2,386,889	24.7%	Rank history: #4 in FY2021, #2 in FY2022, #1 in FY2023 and #1 in FY2024; down 1 since FY2024.
3	General Dynamics Corporation Through General Dynamics Information Technology, Inc. Top agencies EPA (Environmental Protection Agency)	$1,290,476	13.4%	Rank history: not on the FY2021–FY2023 lists and #3 in FY2024; unchanged since FY2024.
4	Nevada System of Higher Education Top agencies DOI (Department of the Interior)	$844,526	8.8%	Rank history: not on the FY2021 list, #5 in FY2022, #4 in FY2023 and #4 in FY2024; unchanged since FY2024.
5	H & L Environmental Services, LLC Top agencies USAF (Department of the Air Force)	$766,565	7.9%	Rank history: not on the FY2021–FY2024 lists; new.
6	Research Triangle Institute Top agencies DOI (Department of the Interior)	$445,680	4.6%	Rank history: #6 in FY2021, #6 in FY2022, #7 in FY2023 and #5 in FY2024; down 1 since FY2024.
7	WSP USA Environment & Infrastructure Inc. Top agencies DOI (Department of the Interior)	$251,937	2.6%	Rank history: #30 in FY2021, #8 in FY2022, not on the FY2023 list and #7 in FY2024; unchanged since FY2024.
8	Trine Environmental Inc. Top agencies VA (Department of Veterans Affairs)	$78,005	0.8%	Rank history: not on the FY2021 list, #25 in FY2022, not on the FY2023 list and #27 in FY2024; up 19 since FY2024.
9	Mabbett & Associates, Inc. Top agencies VA (Department of Veterans Affairs)	$64,821	0.7%	Rank history: #23 in FY2021, #19 in FY2022, not on the FY2023 list and #10 in FY2024; up 1 since FY2024.
10	Satori Defense LLC Top agencies VA (Department of Veterans Affairs)	$60,869	0.6%	Rank history: not on the FY2021–FY2023 lists and #16 in FY2024; up 6 since FY2024.
11	I-2-I Solutions, Inc. Top agencies Navy (Department of the Navy)	$45,500	0.5%	Rank history: not on the FY2021–FY2024 lists; new.
12	Govcrest Inc. Top agencies Navy (Department of the Navy)	$45,500	0.5%	Rank history: not on the FY2021–FY2024 lists; new.
13	Aehs Incorporated Top agencies DHA (Defense Health Agency)	$43,319	0.4%	Rank history: #35 in FY2021, #11 in FY2022, #15 in FY2023 and #11 in FY2024; down 2 since FY2024.
14	AECOM Through Environmental Management & Planning Solutions LLC Top agencies DOI (Department of the Interior)	$40,890	0.4%	Rank history: not on the FY2021–FY2023 lists and #8 in FY2024; down 6 since FY2024.
15	State Board for Community Colleges & OCC Top agencies Army (Department of the Army)	$39,325	0.4%	Rank history: not on the FY2021–FY2024 lists; new.
16	Janicke GBR Ingenieurbüro FÜR Umweltphysik Top agencies DOT (Department of Transportation)	$38,640	0.4%	Rank history: not on the FY2021–FY2023 lists and #18 in FY2024; up 2 since FY2024.
17	Advance Safety Equipment Co. Top agencies Navy (Department of the Navy)	$36,964	0.4%	Rank history: not on the FY2021–FY2023 lists and #20 in FY2024; up 3 since FY2024.
18	Texas Commission On Environmental Quality Top agencies USAF (Department of the Air Force)	$22,994	0.2%	Rank history: not on the FY2021–FY2024 lists; new.
19	CTG Environmental, LLC Top agencies DFAS (Defense Finance and Accounting Service)	$20,200	0.2%	Rank history: not on the FY2021–FY2023 lists and #32 in FY2024; up 13 since FY2024.
20	Thunderbird-Hrp JV LLC Top agencies VA (Department of Veterans Affairs)	$17,372	0.2%	Rank history: not on the FY2021–FY2024 lists; new.
21	Eastern New Mexico University Top agencies Army (Department of the Army)	$16,386	0.2%	Rank history: not on the FY2021–FY2024 lists; new.
22	Kane Environmental Inc Top agencies Navy (Department of the Navy)	$15,786	0.2%	Rank history: not on the FY2021–FY2024 lists; new.
23	Spectral Platforms Inc. Top agencies HHS (Department of Health and Human Services)	$13,499	0.1%	Rank history: not on the FY2021–FY2022 lists, #8 in FY2023 and #15 in FY2024; down 8 since FY2024.
24	Clearair, Inc. Top agencies Navy (Department of the Navy)	$10,990	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
25	Titan Environmental Solutions, Inc. Top agencies Navy (Department of the Navy)	$9,536	0.1%	Rank history: not on the FY2021 list, #33 in FY2022, not on the FY2023 list and #25 in FY2024; unchanged since FY2024.
26	Air Analytics LLC Top agencies VA (Department of Veterans Affairs)	$9,500	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
27	SGS North America Inc. Top agencies DOI (Department of the Interior)	$8,467	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
28	Cteh Government Services LLC Top agencies VA (Department of Veterans Affairs)	$8,317	0.1%	Rank history: not on the FY2021–FY2023 lists and #36 in FY2024; up 8 since FY2024.
29	Green 2 Green Consulting LLC Top agencies VA (Department of Veterans Affairs)	$5,455	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
30	Sierra Piedmont Inc Top agencies DOJ (Department of Justice)	$4,950	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
31	Sage-Efs JV Top agencies VA (Department of Veterans Affairs)	$4,029	<0.1%	Rank history: not on the FY2021 list, #30 in FY2022, not on the FY2023 list and #30 in FY2024; down 1 since FY2024.
32	Occupational Services, Inc. Top agencies DOJ (Department of Justice)	$3,553	<0.1%	Rank history: not on the FY2021–FY2024 lists; new.
33	Tri Airtesting Inc. Top agencies Navy (Department of the Navy)	$2,064	<0.1%	Rank history: not on the FY2021–FY2024 lists; new.
34	Metcut Research Associates Inc. Top agencies NASA (National Aeronautics and Space Administration)	$1,512	<0.1%	Rank history: not on the FY2021–FY2023 lists and #23 in FY2024; down 11 since FY2024.

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 $9.65 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. 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.
• Fiscal year 2025 ran Oct 1, 2024 – Sep 30, 2025. The Department of Defense reports its contract actions to FPDS about 90 days late, so a fiscal year is ranked once they're in, in February, and the list doesn't change after.
• Rank changes compare with FY2024. "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. The step from FY2024 takes the color of the rank change beside it.
• Placeholder recipients FPDS uses when it names no company ("Miscellaneous Foreign Contractors" and the like) aren't ranked.

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