Top 43 Contractors in PSC B502: Air Quality Analysis, FY2021

Full ranking

Rank	Contractor	Net obligations	Share	Trend
1	Mriglobal Top agencies WHS (DOD Washington Headquarters Service)	$3,981,611	24.9%	Rank history: #9 in FY2022 and not on the FY2023–FY2025 lists; unchanged since FY2020.
2	State of California Controllers Office Through University of California, Davis Top agencies DOI (Department of the Interior)	$3,397,047	21.3%	Rank history: #1 in FY2022, #2 in FY2023, #2 in FY2024 and not on the FY2025 list; up 3 since FY2020.
3	Wood Environment & Infrastructure Solutions Inc. 2 awardees, including WSP USA Environment & Infrastructure Inc. Top agencies EPA (Environmental Protection Agency) DOI (Department of the Interior)	$2,891,988	18.1%	Rank history: not on the FY2022 list, #9 in FY2023 and not on the FY2024–FY2025 lists; up 1 since FY2020.
4	Air Resource Specialists, Inc. Top agencies DOI (Department of the Interior)	$2,602,482	16.3%	Rank history: #2 in FY2022, #1 in FY2023, #1 in FY2024 and #2 in FY2025; down 1 since FY2020.
5	Industrial Economics Inc. Top agencies EPA (Environmental Protection Agency)	$605,301	3.8%	Rank history: #4 in FY2022, #5 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
6	Research Triangle Institute Top agencies DOI (Department of the Interior)	$396,000	2.5%	Rank history: #6 in FY2022, #7 in FY2023, #5 in FY2024 and #6 in FY2025; new, not ranked in FY2020.
7	Environmental Management & Planning Solutions LLC Top agencies DOI (Department of the Interior)	$258,436	1.6%	Rank history: #7 in FY2022, #3 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
8	Harris Environmental Group Inc. Top agencies USDA (Department of Agriculture)	$244,720	1.5%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
9	Lindahl Reed, Inc. Top agencies USDA (Department of Agriculture)	$99,984	0.6%	Rank history: not on the FY2022–FY2025 lists; down 1 since FY2020.
10	Limno-Tech Inc. Top agencies DOS (Department of State)	$92,151	0.6%	Rank history: not on the FY2022–FY2025 lists; up 5 since FY2020.
11	Salas O'brien Federal, LLC Top agencies Army (Department of the Army)	$84,905	0.5%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
12	E & S Environmental Chemistry, Inc. Top agencies DOI (Department of the Interior)	$65,000	0.4%	Rank history: #12 in FY2022, #23 in FY2023, #28 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
13	Environmental Consulting Group, Inc. Top agencies Treasury (Department of the Treasury)	$52,978	0.3%	Rank history: #13 in FY2022, #16 in FY2023, #13 in FY2024 and not on the FY2025 list; up 7 since FY2020.
14	Hurt & Proffitt, Inc. Top agencies VA (Department of Veterans Affairs)	$44,700	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
15	Pinyon Environmental, Inc. Top agencies DOI (Department of the Interior)	$37,003	0.2%	Rank history: not on the FY2022 list, #12 in FY2023 and not on the FY2024–FY2025 lists; down 9 since FY2020.
16	S C & A Inc. Top agencies DOI (Department of the Interior)	$29,036	0.2%	Rank history: not on the FY2022–FY2025 lists; down 4 since FY2020.
17	ATC Group Services Inc 2 awardees Top agencies VA (Department of Veterans Affairs)	$27,050	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
18	Environmental Source Samplers, Inc. Top agencies DOS (Department of State)	$24,520	0.2%	Rank history: not on the FY2022–FY2025 lists; up 9 since FY2020.
19	Iveco SUD-West Nutzfahrzeuge GMBH Through Ati, Inc. Top agencies DOI (Department of the Interior) NARA (National Archives and Records Administration)	$24,310	0.2%	Rank history: #18 in FY2022, #19 in FY2023 and not on the FY2024–FY2025 lists; up 5 since FY2020.
20	Phase Associates LLC Top agencies Army (Department of the Army)	$23,840	0.1%	Rank history: #20 in FY2022, not on the FY2023 list, #22 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
21	Advance Safety Equipment Co. Top agencies Navy (Department of the Navy)	$20,334	0.1%	Rank history: #22 in FY2022, #22 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
22	Sandlapper Controls, Inc. Top agencies VA (Department of Veterans Affairs)	$18,928	0.1%	Rank history: #27 in FY2022, #29 in FY2023 and not on the FY2024–FY2025 lists; up 6 since FY2020.
23	Mabbett & Associates, Inc. Top agencies VA (Department of Veterans Affairs)	$17,571	0.1%	Rank history: #19 in FY2022, not on the FY2023 list, #10 in FY2024 and #9 in FY2025; up 10 since FY2020.
24	Aerosol Monitoring & Analysis, Inc. Through CTG Environmental, LLC Top agencies DFAS (Defense Finance and Accounting Service)	$17,100	0.1%	Rank history: #29 in FY2022, #31 in FY2023 and not on the FY2024–FY2025 lists; up 24 since FY2020.
25	Emsl Analytical Inc. Top agencies Army (Department of the Army)	$16,110	0.1%	Rank history: not on the FY2022 list, #45 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
26	Environmental Management, Inc. Top agencies DOI (Department of the Interior)	$14,500	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
27	University of Wisconsin System Top agencies USDA (Department of Agriculture)	$13,368	0.1%	Rank history: #44 in FY2022 and not on the FY2023–FY2025 lists; up 15 since FY2020.
28	Akea, Inc. Top agencies VA (Department of Veterans Affairs)	$12,985	0.1%	Rank history: not on the FY2022–FY2025 lists; up 6 since FY2020.
29	Atmos Solutions Inc. Top agencies Army (Department of the Army)	$12,800	0.1%	Rank history: not on the FY2022 list, #17 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
30	WSP USA Environment & Infrastructure Inc. Top agencies EPA (Environmental Protection Agency)	$12,771	0.1%	Rank history: #8 in FY2022, not on the FY2023 list, #7 in FY2024 and #7 in FY2025; down 28 since FY2020.
31	Advanced Monitoring Methods LLC Top agencies DOI (Department of the Interior)	$11,860	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
32	OHC Environmental Engineering, Inc. Top agencies VA (Department of Veterans Affairs)	$10,795	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
33	Safe Air Systems, Inc. Top agencies Navy (Department of the Navy)	$10,298	0.1%	Rank history: #34 in FY2022 and not on the FY2023–FY2025 lists; up 17 since FY2020.
34	Healthy Buildings International (Va), Inc. Top agencies DOT (Department of Transportation)	$9,461	0.1%	Rank history: not on the FY2022 list, #36 in FY2023 and not on the FY2024–FY2025 lists; down 15 since FY2020.
35	Aehs Incorporated Top agencies Army (Department of the Army)	$9,305	0.1%	Rank history: #11 in FY2022, #15 in FY2023, #11 in FY2024 and #13 in FY2025; down 21 since FY2020.
36	Penn Air Control Inc. Top agencies VA (Department of Veterans Affairs)	$7,650	<0.1%	Rank history: #35 in FY2022, #40 in FY2023 and not on the FY2024–FY2025 lists; up 1 since FY2020.
37	Riverfront Safety & Health, LC Top agencies VA (Department of Veterans Affairs)	$6,972	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
38	Powell, Dale E. Top agencies USDA (Department of Agriculture)	$6,860	<0.1%	Rank history: #39 in FY2022, #42 in FY2023, #34 in FY2024 and not on the FY2025 list; unchanged since FY2020.
39	Energy & Environment, LLC Top agencies DHS (Department of Homeland Security)	$6,530	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
40	Titan Environmental LLC Top agencies VA (Department of Veterans Affairs)	$5,750	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
41	Applied Water Technology, Inc. Top agencies DOJ (Department of Justice)	$5,247	<0.1%	Rank history: #41 in FY2022, #43 in FY2023, #35 in FY2024 and not on the FY2025 list; up 2 since FY2020.
42	Kisiel Edward A Top agencies DOI (Department of the Interior)	$3,685	<0.1%	Rank history: #42 in FY2022, #46 in FY2023, #40 in FY2024 and not on the FY2025 list; up 5 since FY2020.
43	Ramsey, Eric Top agencies USDA (Department of Agriculture)	$3,503	<0.1%	Rank history: not on the FY2022–FY2025 lists; down 4 since FY2020.

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 $16 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 2021 ran Oct 1, 2020 – Sep 30, 2021. 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 FY2020. "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 FY2020 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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