Top 100 Contractors in PSC F1: Environmental Systems Protection, FY2021

Name: Top 100 Contractors in PSC F1: Environmental Systems Protection, FY2021
Creator: GovTribe

Parent companies by net contract obligations Oct 1, 2020 – Sep 30, 2021 Code page on GovTribe

The top 10 won 53% of FY2021 PSC F1 contract dollars

Contract obligations: $1,926,090,919 Net of deobligations, by contracts coded PSC F1 or a code under it
Contractors: 1,218 Parent companies with an obligation
Largest contractor: Bechtel Corp $655 million, 31.7% of obligations
Data as of: Oct 14, 2026

Contract actions from FPDS (SAM.gov). How the rankings work · Download all 100 rows as CSV

Full ranking

Rank	Contractor	Net obligations	Share	Trend
1	Bechtel Corp 2 awardees, including Bechtel Parsons Blue Grass, A Joint Venture and Bechtel National, Inc. Top agencies Army (Department of the Army)	$655,463,231	31.7%	Rank history: #1 in FY2022, #1 in FY2023, #1 in FY2024 and #2 in FY2025; unchanged since FY2020.
2	Hydrogeologic, Inc. Top agencies Army (Department of the Army) EPA (Environmental Protection Agency)	$89,673,997	4.3%	Rank history: #4 in FY2022, #4 in FY2023, #5 in FY2024 and #10 in FY2025; up 1 since FY2020.
3	Environmental Restoration LLC Top agencies EPA (Environmental Protection Agency) DOJ (Department of Justice) USAF (Department of the Air Force)	$67,662,653	3.3%	Rank history: #3 in FY2022, #8 in FY2023, #11 in FY2024 and #5 in FY2025; up 1 since FY2020.
4	Bechtel National, Inc. Top agencies Army (Department of the Army)	$63,000,000	3.0%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
5	Cook Inlet Region Inc. 7 awardees, including North Wind Portage, Inc., North Wind Site Services, LLC and North Wind Construction Services, LLC Top agencies Army (Department of the Army) DOI (Department of the Interior) USAF (Department of the Air Force)	$62,849,288	3.0%	Rank history: #13 in FY2022, #9 in FY2023, #13 in FY2024 and not on the FY2025 list; up 227 since FY2020.
6	Jacobs Engineering Group Inc. 5 awardees, including Amentum Technology, Inc., Ch2M Hill, Inc. and Ch2M Hill Constructors, Inc. Top agencies Army (Department of the Army) EPA (Environmental Protection Agency)	$40,654,307	2.0%	Rank history: #17 in FY2022, #2 in FY2023, #14 in FY2024 and not on the FY2025 list; up 19 since FY2020.
7	EA Engineering, Science, and Technology, Inc., PBC 2 awardees Top agencies EPA (Environmental Protection Agency) USAF (Department of the Air Force) Army (Department of the Army)	$30,677,841	1.5%	Rank history: #2 in FY2022, #5 in FY2023, #4 in FY2024 and #8 in FY2025; up 1 since FY2020.
8	Aptim AECOM Decommissioning, LLC Top agencies Army (Department of the Army)	$28,844,304	1.4%	Rank history: not on the FY2022 list, #11 in FY2023 and not on the FY2024–FY2025 lists; down 3 since FY2020.
9	Arctic Slope Regional Corporation 2 awardees, including Environmental Quality Management, Inc. and EQM Services, LLC Top agencies EPA (Environmental Protection Agency) USAF (Department of the Air Force)	$27,293,116	1.3%	Rank history: #32 in FY2022, #6 in FY2023, #28 in FY2024 and #4 in FY2025; up 12 since FY2020.
10	Camp Dresser & Mckee Inc. Through CDM Federal Programs Corporation Top agencies EPA (Environmental Protection Agency) DOI (Department of the Interior)	$24,488,715	1.2%	Rank history: #11 in FY2022 and not on the FY2023–FY2025 lists; up 30 since FY2020.
11	Kemron Environmental Services, Inc. Top agencies EPA (Environmental Protection Agency) Army (Department of the Army) Navy (Department of the Navy)	$22,596,105	1.1%	Rank history: #14 in FY2022, #25 in FY2023 and not on the FY2024–FY2025 lists; up 8 since FY2020.
12	Bristol Environmental Solutions LLC Top agencies Army (Department of the Army)	$22,251,561	1.1%	Rank history: #99 in FY2022 and not on the FY2023–FY2025 lists; unchanged since FY2020.
13	Tetra Tech, Inc. 11 awardees, including Tetra TECH EC, Inc. Top agencies EPA (Environmental Protection Agency) Army (Department of the Army) USAF (Department of the Air Force)	$21,669,350	1.0%	Rank history: #15 in FY2022, #23 in FY2023, #12 in FY2024 and #9 in FY2025; down 7 since FY2020.
14	Itsi Gilbane Japan G.K. 2 awardees, including Gilbane Federal and Ges-Aecom JV Top agencies Navy (Department of the Navy) EPA (Environmental Protection Agency)	$19,572,367	0.9%	Rank history: #28 in FY2022 and not on the FY2023–FY2025 lists; up 18 since FY2020.
15	Ayuda MC2 JV LLC Top agencies EPA (Environmental Protection Agency)	$17,894,268	0.9%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
16	Oneida Nation 3 awardees, including Oneida Total Integrated Enterprises LLC and Sustainment & Restoration Services, LLC Top agencies USAF (Department of the Air Force) Army (Department of the Army) DOI (Department of the Interior)	$17,622,300	0.9%	Rank history: #9 in FY2022, #12 in FY2023, #42 in FY2024 and not on the FY2025 list; up 8 since FY2020.
17	Cabrera Services Inc. Top agencies Army (Department of the Army) EPA (Environmental Protection Agency)	$15,825,048	0.8%	Rank history: #8 in FY2022, #65 in FY2023 and not on the FY2024–FY2025 lists; down 3 since FY2020.
18	Brice Engineering, LLC Top agencies Army (Department of the Army) DHS (Department of Homeland Security)	$14,921,716	0.7%	Rank history: #16 in FY2022, #15 in FY2023, #49 in FY2024 and #28 in FY2025; up 20 since FY2020.
19	Sevenson-Usa Environmental Joint Venture Top agencies Army (Department of the Army)	$14,602,334	0.7%	Rank history: #57 in FY2022, #64 in FY2023 and not on the FY2024–FY2025 lists; up 169 since FY2020.
20	Leidos Holdings, Inc. 2 awardees, including Leidos, Inc. Top agencies DHS (Department of Homeland Security) DOE (Department of Energy) DOI (Department of the Interior)	$13,330,237	0.6%	Rank history: #56 in FY2022, #29 in FY2023, #62 in FY2024 and not on the FY2025 list; up 78 since FY2020.
21	Guardian Environmental Services Co Inc. Top agencies EPA (Environmental Protection Agency)	$12,885,110	0.6%	Rank history: not on the FY2022–FY2025 lists; up 66 since FY2020.
22	Couvillion Group LLC Top agencies DHS (Department of Homeland Security)	$12,495,506	0.6%	Rank history: #19 in FY2022, #22 in FY2023, #32 in FY2024 and #18 in FY2025; down 12 since FY2020.
23	Parsons Corporation Through Parsons Government Services Inc. Top agencies Army (Department of the Army)	$12,380,190	0.6%	Rank history: #35 in FY2022, #36 in FY2023, #70 in FY2024 and #32 in FY2025; up 6 since FY2020.
24	Ahtna, Incorporated 3 awardees, including Ahtna Global LLC, Ahtna Environmental, Inc. and Ahtna Design-Build Inc. Top agencies Army (Department of the Army) DOT (Department of Transportation) DOE (Department of Energy)	$12,309,074	0.6%	Rank history: #45 in FY2022, #45 in FY2023 and not on the FY2024–FY2025 lists; down 8 since FY2020.
25	EQ & CH Remediation Top agencies EPA (Environmental Protection Agency)	$11,277,327	0.5%	Rank history: #72 in FY2022, #35 in FY2023, #16 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
26	Applied Research Associates, Inc. Top agencies DOI (Department of the Interior)	$11,156,790	0.5%	Rank history: #58 in FY2022, #85 in FY2023, #71 in FY2024 and #66 in FY2025; up 32 since FY2020.
27	C M C, Inc. Top agencies EPA (Environmental Protection Agency)	$10,755,863	0.5%	Rank history: #12 in FY2022, #13 in FY2023, #19 in FY2024 and #60 in FY2025; down 14 since FY2020.
28	Hdr, Inc. 5 awardees, including HDR Aptim LLC and HDR Environmental, Operations and Construction, Inc. Top agencies EPA (Environmental Protection Agency) Navy (Department of the Navy)	$10,345,517	0.5%	Rank history: #24 in FY2022, #30 in FY2023, #72 in FY2024 and not on the FY2025 list; up 63 since FY2020.
29	Brice-Aecom JV1 Top agencies Army (Department of the Army)	$10,241,694	0.5%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
30	Battelle Memorial Institute Top agencies HHS (Department of Health and Human Services) Navy (Department of the Navy)	$10,241,589	0.5%	Rank history: #44 in FY2022, #63 in FY2023 and not on the FY2024–FY2025 lists; up 9 since FY2020.
31	Aptim Federal Services LLC Top agencies Navy (Department of the Navy) Army (Department of the Army) DLA (Defense Logistics Agency)	$9,813,720	0.5%	Rank history: #10 in FY2022, #17 in FY2023 and not on the FY2024–FY2025 lists; down 13 since FY2020.
32	Leisnoi-Kemron 8A JV, LLC Top agencies Navy (Department of the Navy)	$9,769,041	0.5%	Rank history: not on the FY2022–FY2023 lists, #76 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
33	Eastern Research Group Inc. Top agencies EPA (Environmental Protection Agency) DOI (Department of the Interior) DOJ (Department of Justice)	$9,747,632	0.5%	Rank history: #29 in FY2022, #26 in FY2023, #15 in FY2024 and #26 in FY2025; down 3 since FY2020.
34	Energysolutions LLC 2 awardees, including Energysolutions Services, Inc. Top agencies Navy (Department of the Navy)	$9,506,386	0.5%	Rank history: #31 in FY2022, #41 in FY2023 and not on the FY2024–FY2025 lists; down 17 since FY2020.
35	Ie-Weston Federal Services JVB LLC Top agencies Army (Department of the Army)	$9,302,904	0.4%	Rank history: #50 in FY2022 and not on the FY2023–FY2025 lists; unchanged since FY2020.
36	Navarro Research and Engineering, Inc. Top agencies Army (Department of the Army) USAF (Department of the Air Force) DOE (Department of Energy)	$9,244,873	0.4%	Rank history: #34 in FY2022, #51 in FY2023, #36 in FY2024 and #47 in FY2025; down 25 since FY2020.
37	AECOM 4 awardees, including AECOM Technical Services, Inc., Amentum Environment & Energy, Inc. and URS Group, Inc. Top agencies EPA (Environmental Protection Agency) DOT (Department of Transportation) Army (Department of the Army)	$9,140,515	0.4%	Rank history: #5 in FY2022, #3 in FY2023, #52 in FY2024 and not on the FY2025 list; down 15 since FY2020.
38	Amentum Services, Inc. Top agencies Army (Department of the Army)	$8,127,394	0.4%	Rank history: #6 in FY2022, #16 in FY2023 and not on the FY2024–FY2025 lists; up 127 since FY2020.
39	Resolve Marine Group Inc. Top agencies DHS (Department of Homeland Security)	$8,123,380	0.4%	Rank history: not on the FY2022–FY2023 lists, #88 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
40	Kemron / Arrowhead JV, LLC Top agencies EPA (Environmental Protection Agency)	$7,988,834	0.4%	Rank history: #20 in FY2022, #14 in FY2023 and not on the FY2024–FY2025 lists; up 8 since FY2020.
41	A and M Engineering & Environmental Services, Inc. Top agencies EPA (Environmental Protection Agency)	$7,929,157	0.4%	Rank history: #39 in FY2022, not on the FY2023 list, #56 in FY2024 and #53 in FY2025; up 37 since FY2020.
42	Pika International, Inc. Top agencies Army (Department of the Army)	$7,705,168	0.4%	Rank history: #38 in FY2022, #98 in FY2023 and not on the FY2024–FY2025 lists; up 38 since FY2020.
43	The Source Group, Inc. Top agencies DLA (Defense Logistics Agency)	$7,457,568	0.4%	Rank history: #25 in FY2022, not on the FY2023 list, #69 in FY2024 and #54 in FY2025; up 6 since FY2020.
44	Global Diving & Salvage, Inc. Top agencies DHS (Department of Homeland Security)	$7,072,725	0.3%	Rank history: #22 in FY2022, not on the FY2023 list, #55 in FY2024 and not on the FY2025 list; up 30 since FY2020.
45	Hgl-Aptim JV LLC Top agencies DLA (Defense Logistics Agency) EPA (Environmental Protection Agency)	$7,060,405	0.3%	Rank history: #18 in FY2022, #38 in FY2023, #17 in FY2024 and #21 in FY2025; new, not ranked in FY2020.
46	Ea-Wood-2 MP JV Top agencies Army (Department of the Army)	$7,053,310	0.3%	Rank history: not on the FY2022–FY2025 lists; up 68 since FY2020.
47	Nobis Engineering, Inc. Top agencies EPA (Environmental Protection Agency)	$7,005,280	0.3%	Rank history: #30 in FY2022, not on the FY2023 list, #30 in FY2024 and not on the FY2025 list; unchanged since FY2020.
48	Sol Solutions, LLC Top agencies Army (Department of the Army)	$6,337,222	0.3%	Rank history: #54 in FY2022, #61 in FY2023 and not on the FY2024–FY2025 lists; down 5 since FY2020.
49	Seaon Environmental LLC Top agencies Navy (Department of the Navy)	$6,242,500	0.3%	Rank history: #41 in FY2022, #47 in FY2023, #50 in FY2024 and #39 in FY2025; up 109 since FY2020.
50	Susitna Environmental, LLC Top agencies Army (Department of the Army) DOT (Department of Transportation)	$5,873,580	0.3%	Rank history: not on the FY2022–FY2025 lists; up 337 since FY2020.
51	Olgoonik Corporation 2 awardees, including FPM Remediations, Inc. Top agencies Army (Department of the Army)	$5,645,254	0.3%	Rank history: not on the FY2022–FY2025 lists; up 89 since FY2020.
52	Environmental Compliance Consultants, Inc. Top agencies Army (Department of the Army) Navy (Department of the Navy) DOI (Department of the Interior)	$5,599,284	0.3%	Rank history: #52 in FY2022, #55 in FY2023, #63 in FY2024 and #97 in FY2025; up 16 since FY2020.
53	Science Applications International Corporation Top agencies Navy (Department of the Navy)	$5,567,193	0.3%	Rank history: not on the FY2022–FY2025 lists; down 12 since FY2020.
54	Salas O'brien Federal, LLC Top agencies Army (Department of the Army)	$5,560,828	0.3%	Rank history: not on the FY2022–FY2025 lists; up 18 since FY2020.
55	Bers-Weston Services Jvc, LLC Top agencies Navy (Department of the Navy)	$5,476,281	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
56	Paragon-Jacobs Joint Venture, LLC Top agencies Army (Department of the Army)	$5,335,919	0.3%	Rank history: #40 in FY2022, not on the FY2023–FY2024 lists and #98 in FY2025; down 2 since FY2020.
57	CTI and Associates, Inc. 2 awardees Top agencies DOE (Department of Energy) Army (Department of the Army) EPA (Environmental Protection Agency)	$4,873,045	0.2%	Rank history: not on the FY2022–FY2025 lists; up 138 since FY2020.
58	Triumvirate Environmental, LLC Top agencies HHS (Department of Health and Human Services) Commerce (Department of Commerce) Army (Department of the Army)	$4,812,113	0.2%	Rank history: #70 in FY2022, #57 in FY2023, #60 in FY2024 and #59 in FY2025; down 1 since FY2020.
59	KGS Seres 8A JV LLC Top agencies Army (Department of the Army)	$4,717,200	0.2%	Rank history: #64 in FY2022, #75 in FY2023, #80 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
60	Calista Corp 2 awardees, including Brice Environmental Services Corporation Top agencies DOT (Department of Transportation)	$4,561,047	0.2%	Rank history: not on the FY2022–FY2023 lists, #90 in FY2024 and not on the FY2025 list; up 33 since FY2020.
61	North Wind-Ea JV, LLC Top agencies Army (Department of the Army)	$4,331,986	0.2%	Rank history: not on the FY2022–FY2025 lists; up 177 since FY2020.
62	Cape Environmental Management Inc. 2 awardees Top agencies Navy (Department of the Navy)	$4,308,055	0.2%	Rank history: #26 in FY2022, not on the FY2023–FY2024 lists and #56 in FY2025; down 47 since FY2020.
63	Perma-Fix Environmental Services, Inc. Top agencies Navy (Department of the Navy)	$4,197,097	0.2%	Rank history: not on the FY2022–FY2025 lists; up 43 since FY2020.
64	Ahtna Infrastructure & Technologies LLC Top agencies Commerce (Department of Commerce)	$4,184,064	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
65	Windjammer Environmental LLC Top agencies HHS (Department of Health and Human Services) Navy (Department of the Navy)	$3,999,727	0.2%	Rank history: not on the FY2022–FY2025 lists; up 53 since FY2020.
66	OCH JV Top agencies EPA (Environmental Protection Agency) Navy (Department of the Navy)	$3,919,874	0.2%	Rank history: not on the FY2022–FY2023 lists, #27 in FY2024 and not on the FY2025 list; unchanged since FY2020.
67	C & C Environmental Inc. Top agencies Army (Department of the Army) DOI (Department of the Interior)	$3,842,797	0.2%	Rank history: #82 in FY2022, #90 in FY2023, #100 in FY2024 and #76 in FY2025; up 8 since FY2020.
68	Indus General Inc. Top agencies Navy (Department of the Navy)	$3,791,956	0.2%	Rank history: not on the FY2022–FY2025 lists; up 68 since FY2020.
69	Pacific Commercial Services, Inc. Top agencies Navy (Department of the Navy) VA (Department of Veterans Affairs) DOI (Department of the Interior)	$3,750,435	0.2%	Rank history: #84 in FY2022 and not on the FY2023–FY2025 lists; up 52 since FY2020.
70	Environmental, Safety & Health Consulting Services, Inc. Top agencies DHS (Department of Homeland Security) DOT (Department of Transportation)	$3,674,543	0.2%	Rank history: not on the FY2022–FY2025 lists; down 50 since FY2020.
71	Natives of Kodiak, Incorporated 2 awardees, including Koman Government Solutions LLC and Environmental Assessment Services, LLC Top agencies Navy (Department of the Navy) Army (Department of the Army)	$3,642,209	0.2%	Rank history: #68 in FY2022, #59 in FY2023 and not on the FY2024–FY2025 lists; down 16 since FY2020.
72	Bethel Environmental Solutions LLC Top agencies Army (Department of the Army) DOT (Department of Transportation)	$3,636,674	0.2%	Rank history: #53 in FY2022 and not on the FY2023–FY2025 lists; up 82 since FY2020.
73	ABT Global LLC 2 awardees Top agencies EPA (Environmental Protection Agency)	$3,486,809	0.2%	Rank history: not on the FY2022 list, #100 in FY2023 and not on the FY2024–FY2025 lists; up 108 since FY2020.
74	Weston Solutions Holdings, Inc. 3 awardees, including Weston Solutions Inc. Top agencies Army (Department of the Army)	$3,464,834	0.2%	Rank history: #36 in FY2022, #49 in FY2023, #23 in FY2024 and #44 in FY2025; down 67 since FY2020.
75	Bvspc - Envirocon JV Top agencies EPA (Environmental Protection Agency)	$3,347,189	0.2%	Rank history: not on the FY2022–FY2025 lists; down 49 since FY2020.
76	Techlaw, Inc. 2 awardees, including Techlaw Consultants Inc. Top agencies EPA (Environmental Protection Agency)	$3,319,811	0.2%	Rank history: #85 in FY2022, #91 in FY2023 and not on the FY2024–FY2025 lists; up 151 since FY2020.
77	Walter Thomas & Associates, Incorporated Top agencies VA (Department of Veterans Affairs)	$3,318,639	0.2%	Rank history: not on the FY2022–FY2025 lists; up 377 since FY2020.
78	Straughan Environmental, Inc. Top agencies NASA (National Aeronautics and Space Administration)	$3,169,979	0.2%	Rank history: #83 in FY2022, #94 in FY2023, not on the FY2024 list and #80 in FY2025; down 2 since FY2020.
79	Mabbett & Associates, Inc. Top agencies VA (Department of Veterans Affairs) Army (Department of the Army)	$3,115,670	0.2%	Rank history: not on the FY2022–FY2025 lists; up 107 since FY2020.
80	Ones Whitetail Joint Venture LLC Top agencies Army (Department of the Army)	$3,078,610	0.1%	Rank history: #93 in FY2022 and not on the FY2023–FY2025 lists; up 6 since FY2020.
81	Insight-Esi LLC Top agencies Navy (Department of the Navy)	$2,984,043	0.1%	Rank history: not on the FY2022–FY2025 lists; up 297 since FY2020.
82	Earth Resources Technology, LLC Top agencies Army (Department of the Army) DOI (Department of the Interior)	$2,942,138	0.1%	Rank history: not on the FY2022–FY2025 lists; up 157 since FY2020.
83	Veolia Water North America-West LLC Through Veolia Es Technical Solutions LLC Top agencies Army (Department of the Army) DOJ (Department of Justice) Treasury (Department of the Treasury)	$2,823,610	0.1%	Rank history: not on the FY2022–FY2025 lists; up 12 since FY2020.
84	Research Triangle Institute Top agencies EPA (Environmental Protection Agency)	$2,822,591	0.1%	Rank history: #43 in FY2022, #33 in FY2023, #53 in FY2024 and #52 in FY2025; down 38 since FY2020.
85	Ch2M Hill, Inc. Top agencies EPA (Environmental Protection Agency)	$2,744,027	0.1%	Rank history: #21 in FY2022, not on the FY2023 list, #33 in FY2024 and #41 in FY2025; new, not ranked in FY2020.
86	Day & Zimmermann Lone Star LLC Top agencies Army (Department of the Army)	$2,741,198	0.1%	Rank history: #74 in FY2022 and not on the FY2023–FY2025 lists; up 30 since FY2020.
87	Ahtna Engineering Services, LLC 2 awardees Top agencies Army (Department of the Army)	$2,723,198	0.1%	Rank history: not on the FY2022–FY2025 lists; down 22 since FY2020.
88	T & T Marine Salvage, Inc. Top agencies DHS (Department of Homeland Security)	$2,677,394	0.1%	Rank history: not on the FY2022–FY2025 lists; up 9 since FY2020.
89	Hoolaulima Government Solutions, LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$2,661,933	0.1%	Rank history: not on the FY2022–FY2025 lists; down 37 since FY2020.
90	Mno-Bmadsen Through Seven Generations Architecture & Engineering LLC Top agencies DOI (Department of the Interior)	$2,641,531	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
91	Pi2E JV LLP Top agencies HHS (Department of Health and Human Services) HUD (Department of Housing and Urban Development) Navy (Department of the Navy)	$2,634,615	0.1%	Rank history: #62 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
92	Engineering / Remediation Resources Group, Inc. 2 awardees Top agencies Navy (Department of the Navy) DOI (Department of the Interior) USAF (Department of the Air Force)	$2,634,112	0.1%	Rank history: #42 in FY2022, not on the FY2023 list, #43 in FY2024 and #72 in FY2025; down 64 since FY2020.
93	Clean Harbors Inc 4 awardees, including Clean Harbors Environmental Services Inc., Safety-Kleen Systems, Inc. and Clean Harbors Caribe, Inc. Top agencies Treasury (Department of the Treasury) Navy (Department of the Navy) DHS (Department of Homeland Security)	$2,625,460	0.1%	Rank history: #61 in FY2022, #74 in FY2023 and not on the FY2024–FY2025 lists; up 78 since FY2020.
94	Specpro Professional Services, LLC Top agencies Army (Department of the Army)	$2,567,612	0.1%	Rank history: #92 in FY2022 and not on the FY2023–FY2025 lists; down 13 since FY2020.
95	Veterans Worldwide Sales & Services, LLC Top agencies EPA (Environmental Protection Agency)	$2,530,323	0.1%	Rank history: not on the FY2022–FY2025 lists; down 62 since FY2020.
96	ST George Tanaq Corp 2 awardees, including Heliotech Top agencies EPA (Environmental Protection Agency)	$2,522,963	0.1%	Rank history: #51 in FY2022, #43 in FY2023 and not on the FY2024–FY2025 lists; down 73 since FY2020.
97	Pacific Environmental Corporation Top agencies DLA (Defense Logistics Agency) DHS (Department of Homeland Security) Commerce (Department of Commerce)	$2,496,246	0.1%	Rank history: not on the FY2022–FY2025 lists; up 394 since FY2020.
98	Arcadis N.V. Through Arcadis U.s., Inc. Top agencies USAF (Department of the Air Force)	$2,462,906	0.1%	Rank history: not on the FY2022–FY2025 lists; down 62 since FY2020.
99	Seres-Arcadis SB JV, LLC Top agencies Army (Department of the Army)	$2,429,388	0.1%	Rank history: not on the FY2022 list, #58 in FY2023 and not on the FY2024–FY2025 lists; up 24 since FY2020.
100	Noreas, Inc. Top agencies Army (Department of the Army) NASA (National Aeronautics and Space Administration) Navy (Department of the Navy)	$2,424,713	0.1%	Rank history: not on the FY2022–FY2025 lists; up 42 since FY2020.

Show 75 more

100 of 1,218 contractors listed here. See the rest on GovTribe.

Rankings for the codes under PSC F1

Code	Net obligations	Largest contractor
F108 Hazardous Substance Removal, Cleanup, and Disposal Services and Operational Support	$1,701,255,626	Bechtel Corp
F112 Oil Spill Response including Cleanup, Removal, Disposal and Operational Support	$73,113,855	Couvillion Group LLC
F115 Environmental Systems Protection – Environmental Consulting and Legal Support	$50,755,338	Battelle Memorial Institute
F110 Development of Environmental Impact Statements and Assessments	$30,105,380	Science Applications International Corporation
F103 Water Quality Support Services	$21,123,939	Seaon Environmental LLC
F107 Hazardous Substance Analysis	$17,013,320	Mno-Bmadsen
F105 Pesticides Support Services	$11,333,698	Paleowest LLC
F101 Air Quality Support Services	$9,608,061	Eastern Research Group Inc.
F114 Environmental Systems Protection – Environmental Licensing and Permitting	$6,581,741	Pacific Commercial Services, Inc.
F111 Industrial Investigations, Surveys and Technical Support for Multiple Pollutants	$2,939,942	Straughan Environmental, Inc.

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 $2.07 billion 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.

Quick answers

Who were the top 10 PSC F1 contractors in FY2021?

1. Bechtel Corp ($655M), 2. Hydrogeologic, Inc. ($89.7M), 3. Environmental Restoration LLC ($67.7M), 4. Bechtel National, Inc. ($63M), 5. Cook Inlet Region Inc. ($62.8M), 6. Jacobs Engineering Group Inc. ($40.7M), 7. EA Engineering, Science, and Technology, Inc., PBC ($30.7M), 8. Aptim AECOM Decommissioning, LLC ($28.8M), 9. Arctic Slope Regional Corporation ($27.3M), 10. Camp Dresser & Mckee Inc. ($24.5M).

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