Top 100 Contractors in PSC F1: Environmental Systems Protection, FY2025

Name: Top 100 Contractors in PSC F1: Environmental Systems Protection, FY2025
Creator: GovTribe

Parent companies by net contract obligations Oct 1, 2024 – Sep 30, 2025 Code page on GovTribe

The top 10 won 48% of FY2025 PSC F1 contract dollars

Contract obligations: $2,601,911,667 Net of deobligations, by contracts coded PSC F1 or a code under it
Contractors: 1,168 Parent companies with an obligation
Largest contractor: Bechtel Parsons Blue Grass, A Joint Venture $289 million, 10.2% 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 Parsons Blue Grass, A Joint Venture Top agencies Army (Department of the Army)	$289,456,116	10.2%	Rank history: not on the FY2021–FY2023 lists and #2 in FY2024; up 1 since FY2024.
2	Bechtel Corp Through Bechtel National, Inc. Top agencies Army (Department of the Army)	$237,713,874	8.4%	Rank history: #1 in FY2021, #1 in FY2022, #1 in FY2023 and #1 in FY2024; down 1 since FY2024.
3	Sevenson Environmental Services, Inc. Top agencies EPA (Environmental Protection Agency) Army (Department of the Army)	$162,200,267	5.7%	Rank history: not on the FY2021–FY2022 lists, #27 in FY2023 and #3 in FY2024; unchanged since FY2024.
4	Arctic Slope Regional Corporation 2 awardees, including Environmental Quality Management, Inc. Top agencies EPA (Environmental Protection Agency) USAF (Department of the Air Force)	$144,030,187	5.1%	Rank history: #9 in FY2021, #32 in FY2022, #6 in FY2023 and #28 in FY2024; up 24 since FY2024.
5	Environmental Restoration LLC Top agencies EPA (Environmental Protection Agency) DOJ (Department of Justice) Army (Department of the Army)	$103,086,173	3.6%	Rank history: #3 in FY2021, #3 in FY2022, #8 in FY2023 and #11 in FY2024; up 6 since FY2024.
6	North Wind Portage, Inc. Top agencies DOE (Department of Energy) Army (Department of the Army)	$95,318,811	3.4%	Rank history: not on the FY2021 list, #7 in FY2022, #50 in FY2023 and #7 in FY2024; up 1 since FY2024.
7	Amentum Holdings, Inc. 3 awardees, including Amentum Technology, Inc., Amentum Environment & Energy, Inc. and Amentum Services, Inc. Top agencies Army (Department of the Army) DOT (Department of Transportation) Navy (Department of the Navy)	$93,463,027	3.3%	Rank history: not on the FY2021–FY2024 lists; new.
8	EA Engineering Science and Technology Inc. PBC Top agencies EPA (Environmental Protection Agency) Army (Department of the Army) Navy (Department of the Navy)	$82,896,256	2.9%	Rank history: #7 in FY2021, #2 in FY2022, #5 in FY2023 and #4 in FY2024; down 4 since FY2024.
9	Tetra Tech, Inc. 6 awardees, including Tetra TECH EC, Inc. Top agencies Army (Department of the Army) Navy (Department of the Navy) EPA (Environmental Protection Agency)	$82,337,374	2.9%	Rank history: #13 in FY2021, #15 in FY2022, #23 in FY2023 and #12 in FY2024; up 3 since FY2024.
10	Hydrogeologic, Inc. Top agencies EPA (Environmental Protection Agency) Army (Department of the Army) Navy (Department of the Navy)	$81,364,936	2.9%	Rank history: #2 in FY2021, #4 in FY2022, #4 in FY2023 and #5 in FY2024; down 5 since FY2024.
11	AECOM Technical Services, Inc. Top agencies Army (Department of the Army) EPA (Environmental Protection Agency) Navy (Department of the Navy)	$52,837,507	1.9%	Rank history: not on the FY2021–FY2023 lists and #8 in FY2024; down 3 since FY2024.
12	Oneida Environmental, LLC Top agencies Army (Department of the Army) DOI (Department of the Interior)	$42,510,661	1.5%	Rank history: not on the FY2021–FY2024 lists; up 91 since FY2024.
13	Inmar RX Solutions Inc. Top agencies HHS (Department of Health and Human Services)	$41,222,752	1.5%	Rank history: not on the FY2021–FY2024 lists; new.
14	Hgl-Aptim Technologies JV LLC Top agencies Army (Department of the Army) DLA (Defense Logistics Agency) USAF (Department of the Air Force)	$39,559,698	1.4%	Rank history: not on the FY2021–FY2024 lists; new.
15	CDM Federal Programs Corporation Top agencies EPA (Environmental Protection Agency)	$31,638,835	1.1%	Rank history: not on the FY2021–FY2022 lists, #54 in FY2023 and #20 in FY2024; up 5 since FY2024.
16	Kemron Environmental Services Inc. 2 awardees, including Kemron / Arrowhead JV, LLC Top agencies EPA (Environmental Protection Agency) Army (Department of the Army)	$28,940,004	1.0%	Rank history: not on the FY2021–FY2023 lists and #6 in FY2024; down 10 since FY2024.
17	Republic Services Inc. 6 awardees, including Environmental, Safety & Health Consulting Services, Inc., US Ecology Washington Inc. and National Response Corporation Top agencies DHS (Department of Homeland Security) Navy (Department of the Navy) Treasury (Department of the Treasury)	$27,249,360	1.0%	Rank history: not on the FY2021–FY2024 lists; up 93 since FY2024.
18	Couvillion Group LLC Top agencies DHS (Department of Homeland Security)	$26,914,727	0.9%	Rank history: #22 in FY2021, #19 in FY2022, #22 in FY2023 and #32 in FY2024; up 14 since FY2024.
19	Ahtna Global LLC 2 awardees Top agencies Army (Department of the Army)	$26,229,513	0.9%	Rank history: not on the FY2021–FY2023 lists and #64 in FY2024; up 45 since FY2024.
20	Conti Federal Services, LLC Top agencies EPA (Environmental Protection Agency)	$23,113,117	0.8%	Rank history: not on the FY2021–FY2023 lists and #26 in FY2024; up 6 since FY2024.
21	Hgl-Aptim JV LLC Top agencies Army (Department of the Army) DLA (Defense Logistics Agency)	$22,593,623	0.8%	Rank history: #45 in FY2021, #18 in FY2022, #38 in FY2023 and #17 in FY2024; down 4 since FY2024.
22	Aleut Environmental Remediation, LLC Top agencies Army (Department of the Army)	$22,585,999	0.8%	Rank history: not on the FY2021–FY2024 lists; up 229 since FY2024.
23	Gsia-Parsons JV LLC Top agencies Army (Department of the Army)	$22,190,054	0.8%	Rank history: not on the FY2021–FY2024 lists; new.
24	Paragon Professional Services LLC 2 awardees Top agencies EPA (Environmental Protection Agency) Army (Department of the Army)	$21,555,840	0.8%	Rank history: not on the FY2021–FY2022 lists, #34 in FY2023 and #31 in FY2024; up 7 since FY2024.
25	Ahtna-Brennan JV, LLC Top agencies EPA (Environmental Protection Agency)	$21,315,304	0.8%	Rank history: not on the FY2021–FY2024 lists; new.
26	Eastern Research Group Inc. Top agencies EPA (Environmental Protection Agency)	$21,254,993	0.7%	Rank history: #33 in FY2021, #29 in FY2022, #26 in FY2023 and #15 in FY2024; down 11 since FY2024.
27	Bristol Bay Native Corporation Through Bristol Environmental Solutions LLC Top agencies Army (Department of the Army)	$18,784,374	0.7%	Rank history: not on the FY2021–FY2022 lists, #42 in FY2023 and #87 in FY2024; up 60 since FY2024.
28	Brice Engineering, LLC Top agencies Army (Department of the Army) DHS (Department of Homeland Security)	$18,541,245	0.7%	Rank history: #18 in FY2021, #16 in FY2022, #15 in FY2023 and #49 in FY2024; up 21 since FY2024.
29	Jacobs Government Services Company 5 awardees, including Jacobs Engineering Group Inc., Jacobs Usae Joint Venture and Ch2M Hill Constructors, Inc. Top agencies EPA (Environmental Protection Agency) DECA (Defense Commissary Agency) Army (Department of the Army)	$18,256,530	0.6%	Rank history: not on the FY2021–FY2022 lists, #62 in FY2023 and #46 in FY2024; up 17 since FY2024.
30	Guidehouse Inc. Through Aptim Federal Services, LLC Top agencies Army (Department of the Army) Navy (Department of the Navy)	$18,119,284	0.6%	Rank history: not on the FY2021–FY2023 lists and #45 in FY2024; up 15 since FY2024.
31	Arrowhead Contracting, LLC Top agencies EPA (Environmental Protection Agency)	$17,181,032	0.6%	Rank history: not on the FY2021–FY2022 lists, #21 in FY2023 and #79 in FY2024; up 48 since FY2024.
32	Parsons Corporation Through Parsons Government Services Inc. Top agencies Army (Department of the Army) MDA (DOD Missile Defense Agency)	$15,976,960	0.6%	Rank history: #23 in FY2021, #35 in FY2022, #36 in FY2023 and #70 in FY2024; up 38 since FY2024.
33	Aerostar Environmental and Construction LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$15,910,838	0.6%	Rank history: not on the FY2021–FY2022 lists, #92 in FY2023 and not on the FY2024 list; up 174 since FY2024.
34	Enviro-Fix Solutions LLC Top agencies Army (Department of the Army)	$15,580,291	0.5%	Rank history: not on the FY2021–FY2022 lists, #39 in FY2023 and #37 in FY2024; up 3 since FY2024.
35	Promethean Operating I LLC Top agencies DOI (Department of the Interior)	$14,866,119	0.5%	Rank history: not on the FY2021–FY2023 lists and #35 in FY2024; unchanged since FY2024.
36	Eastern Shawnee - Bay West JV, LLC Top agencies Army (Department of the Army)	$14,384,119	0.5%	Rank history: not on the FY2021–FY2024 lists; new.
37	Clean Harbors Inc. 2 awardees, including Clean Harbors Environmental Services Inc. Top agencies USAF (Department of the Air Force) DHS (Department of Homeland Security) USDA (Department of Agriculture)	$13,522,903	0.5%	Rank history: not on the FY2021–FY2023 lists and #77 in FY2024; up 40 since FY2024.
38	Environmental Chemical Corporation Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$12,196,282	0.4%	Rank history: not on the FY2021–FY2022 lists, #52 in FY2023 and #24 in FY2024; down 14 since FY2024.
39	Seaon Environmental LLC Top agencies Navy (Department of the Navy)	$11,551,197	0.4%	Rank history: #49 in FY2021, #41 in FY2022, #47 in FY2023 and #50 in FY2024; up 11 since FY2024.
40	Noreas Environmental Services LLC Top agencies Army (Department of the Army)	$11,267,164	0.4%	Rank history: not on the FY2021–FY2022 lists, #46 in FY2023 and #47 in FY2024; up 7 since FY2024.
41	Ch2M Hill, Inc. Top agencies EPA (Environmental Protection Agency) Army (Department of the Army)	$11,060,757	0.4%	Rank history: #85 in FY2021, #21 in FY2022, not on the FY2023 list and #33 in FY2024; down 8 since FY2024.
42	Veolia Es Technical Solutions LLC Top agencies Army (Department of the Army) EPA (Environmental Protection Agency) HHS (Department of Health and Human Services)	$10,927,005	0.4%	Rank history: not on the FY2021–FY2024 lists; up 72 since FY2024.
43	Weston-Techlaw JV LLC Top agencies EPA (Environmental Protection Agency)	$10,772,588	0.4%	Rank history: not on the FY2021 list, #49 in FY2022, #31 in FY2023 and #40 in FY2024; down 3 since FY2024.
44	Weston Solutions Holdings Inc 2 awardees, including Weston Solutions Inc. Top agencies EPA (Environmental Protection Agency)	$10,742,735	0.4%	Rank history: #74 in FY2021, #36 in FY2022, #49 in FY2023 and #23 in FY2024; down 21 since FY2024.
45	Amentum Technology, Inc. Top agencies Army (Department of the Army)	$10,503,670	0.4%	Rank history: not on the FY2021–FY2023 lists and #10 in FY2024; down 35 since FY2024.
46	Tehama Technical Services, LLC Top agencies Army (Department of the Army)	$10,065,342	0.4%	Rank history: not on the FY2021–FY2024 lists; up 212 since FY2024.
47	Navarro Research and Engineering, Inc. Top agencies Army (Department of the Army)	$9,411,259	0.3%	Rank history: #36 in FY2021, #34 in FY2022, #51 in FY2023 and #36 in FY2024; down 11 since FY2024.
48	Ahtna Solutions, LLC Top agencies Army (Department of the Army) DOI (Department of the Interior) DOT (Department of Transportation)	$9,310,394	0.3%	Rank history: not on the FY2021–FY2022 lists, #44 in FY2023 and #65 in FY2024; up 17 since FY2024.
49	Cape-Weston JV3 LLC Top agencies Navy (Department of the Navy)	$8,356,896	0.3%	Rank history: not on the FY2021–FY2024 lists; up 170 since FY2024.
50	Aergc JV LLC Top agencies Army (Department of the Army)	$8,326,564	0.3%	Rank history: not on the FY2021–FY2024 lists; new.
51	North Wind Site Services, LLC Top agencies DOE (Department of Energy) Army (Department of the Army)	$7,927,441	0.3%	Rank history: not on the FY2021–FY2024 lists; new.
52	Research Triangle Institute Top agencies EPA (Environmental Protection Agency)	$7,755,238	0.3%	Rank history: #84 in FY2021, #43 in FY2022, #33 in FY2023 and #53 in FY2024; up 1 since FY2024.
53	A and M Engineering & Environmental Services, Inc. Top agencies EPA (Environmental Protection Agency)	$7,707,747	0.3%	Rank history: #41 in FY2021, #39 in FY2022, not on the FY2023 list and #56 in FY2024; up 3 since FY2024.
54	The Source Group, Inc. Top agencies DLA (Defense Logistics Agency)	$7,646,980	0.3%	Rank history: #43 in FY2021, #25 in FY2022, not on the FY2023 list and #69 in FY2024; up 15 since FY2024.
55	Pika International Inc. 2 awardees, including Pika-Pirnie JV LLC Top agencies Army (Department of the Army)	$7,567,401	0.3%	Rank history: not on the FY2021–FY2023 lists and #51 in FY2024; down 4 since FY2024.
56	Cape Environmental Management Inc. Top agencies Army (Department of the Army) Navy (Department of the Navy)	$7,462,963	0.3%	Rank history: #62 in FY2021, #26 in FY2022 and not on the FY2023–FY2024 lists; up 113 since FY2024.
57	Energysolutions, LLC Top agencies EPA (Environmental Protection Agency) Navy (Department of the Navy)	$7,327,700	0.3%	Rank history: not on the FY2021–FY2024 lists; up 425 since FY2024.
58	Fpm-Aecom JV1 2 awardees, including Fpm-Aecom JV2 Top agencies Army (Department of the Army)	$7,008,253	0.2%	Rank history: not on the FY2021 list, #33 in FY2022, #24 in FY2023 and #39 in FY2024; down 19 since FY2024.
59	Triumvirate Environmental, LLC Top agencies HHS (Department of Health and Human Services) Commerce (Department of Commerce) Army (Department of the Army)	$6,855,151	0.2%	Rank history: #58 in FY2021, #70 in FY2022, #57 in FY2023 and #60 in FY2024; up 1 since FY2024.
60	C M C, Inc. Top agencies EPA (Environmental Protection Agency)	$6,209,587	0.2%	Rank history: #27 in FY2021, #12 in FY2022, #13 in FY2023 and #19 in FY2024; down 41 since FY2024.
61	Fidelis-Bbd, LLC Top agencies EPA (Environmental Protection Agency)	$6,030,015	0.2%	Rank history: not on the FY2021–FY2024 lists; new.
62	Ahtna-Arcadis 8(A) JV, LLC Top agencies Army (Department of the Army)	$6,002,720	0.2%	Rank history: not on the FY2021–FY2022 lists, #87 in FY2023 and #38 in FY2024; down 24 since FY2024.
63	PCI Bhate JV LLC Top agencies USAF (Department of the Air Force) DLA (Defense Logistics Agency) Army (Department of the Army)	$5,936,559	0.2%	Rank history: not on the FY2021–FY2022 lists, #95 in FY2023 and not on the FY2024 list; returned.
64	3D Envirologics LLC Top agencies HHS (Department of Health and Human Services)	$5,845,879	0.2%	Rank history: not on the FY2021–FY2024 lists; up 38 since FY2024.
65	Environmental Science Corporation Top agencies Navy (Department of the Navy)	$5,767,492	0.2%	Rank history: not on the FY2021–FY2024 lists; up 189 since FY2024.
66	Applied Research Associates, Inc. Top agencies DOI (Department of the Interior)	$5,614,694	0.2%	Rank history: #26 in FY2021, #58 in FY2022, #85 in FY2023 and #71 in FY2024; up 5 since FY2024.
67	LPS Kemron JV LLC Top agencies EPA (Environmental Protection Agency)	$5,370,014	0.2%	Rank history: not on the FY2021–FY2024 lists; new.
68	Inspection Experts Inc. Top agencies DHS (Department of Homeland Security) Army (Department of the Army) Navy (Department of the Navy)	$5,252,185	0.2%	Rank history: not on the FY2021–FY2024 lists; up 57 since FY2024.
69	Oneida Total Integrated Enterprises LLC Top agencies USAF (Department of the Air Force) DLA (Defense Logistics Agency) VA (Department of Veterans Affairs)	$5,201,659	0.2%	Rank history: not on the FY2021–FY2023 lists and #78 in FY2024; up 9 since FY2024.
70	Oneida-Stantec JV LLC Top agencies Army (Department of the Army)	$5,168,223	0.2%	Rank history: not on the FY2021–FY2024 lists; new.
71	Stantec Inc. 2 awardees, including Stantec Consulting Services Inc. Top agencies DOI (Department of the Interior)	$5,145,625	0.2%	Rank history: not on the FY2021–FY2024 lists; new.
72	Engineering/Remediation Resources Group Inc. Top agencies USDA (Department of Agriculture) Navy (Department of the Navy) DOI (Department of the Interior)	$4,910,196	0.2%	Rank history: #92 in FY2021, #42 in FY2022, not on the FY2023 list and #43 in FY2024; down 29 since FY2024.
73	J.f. Brennan Company, Inc. Top agencies EPA (Environmental Protection Agency) Army (Department of the Army)	$4,748,916	0.2%	Rank history: not on the FY2021–FY2023 lists and #21 in FY2024; down 52 since FY2024.
74	Sun Coast Resources Inc. Top agencies VA (Department of Veterans Affairs)	$4,694,240	0.2%	Rank history: not on the FY2021–FY2024 lists; new.
75	Bayside-Errg JV Top agencies DOI (Department of the Interior)	$4,549,842	0.2%	Rank history: not on the FY2021–FY2024 lists; new.
76	C & C Environmental Inc. Top agencies Army (Department of the Army) EPA (Environmental Protection Agency)	$4,545,390	0.2%	Rank history: #67 in FY2021, #82 in FY2022, #90 in FY2023 and #100 in FY2024; up 24 since FY2024.
77	Broadbent & Associates, Inc. Top agencies DOI (Department of the Interior)	$4,467,532	0.2%	Rank history: not on the FY2021–FY2023 lists and #81 in FY2024; up 4 since FY2024.
78	State of California Department of Toxic Substances Control Top agencies NASA (National Aeronautics and Space Administration)	$4,409,669	0.2%	Rank history: not on the FY2021–FY2024 lists; new.
79	GSI North America Inc. Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$4,389,831	0.2%	Rank history: not on the FY2021–FY2023 lists and #61 in FY2024; down 18 since FY2024.
80	Straughan Environmental, Inc. Top agencies NASA (National Aeronautics and Space Administration)	$4,354,136	0.2%	Rank history: #78 in FY2021, #83 in FY2022, #94 in FY2023 and not on the FY2024 list; up 33 since FY2024.
81	The Cadmus Group LLC Top agencies EPA (Environmental Protection Agency) HHS (Department of Health and Human Services)	$4,346,598	0.2%	Rank history: not on the FY2021–FY2024 lists; up 231 since FY2024.
82	ABT Global LLC Top agencies EPA (Environmental Protection Agency)	$4,246,921	0.1%	Rank history: not on the FY2021–FY2023 lists and #75 in FY2024; down 7 since FY2024.
83	Brice Solutions, LLC Top agencies DOT (Department of Transportation)	$4,236,479	0.1%	Rank history: not on the FY2021 list, #69 in FY2022, #37 in FY2023 and #34 in FY2024; down 49 since FY2024.
84	TDX Power Services LLC Through Bering Sea Eccotech, LLC Top agencies Navy (Department of the Navy)	$4,230,600	0.1%	Rank history: not on the FY2021–FY2023 lists and #83 in FY2024; down 1 since FY2024.
85	Bay West LLC Top agencies Army (Department of the Army) DOJ (Department of Justice)	$3,984,031	0.1%	Rank history: not on the FY2021–FY2024 lists; up 68 since FY2024.
86	Dawson Solutions LLC Top agencies Army (Department of the Army)	$3,952,301	0.1%	Rank history: not on the FY2021–FY2023 lists and #25 in FY2024; down 61 since FY2024.
87	Nakupuna Consulting LLC Top agencies Army (Department of the Army)	$3,887,221	0.1%	Rank history: not on the FY2021–FY2024 lists; up 54 since FY2024.
88	Tahkox E2-Whitetail LLC Top agencies Army (Department of the Army)	$3,855,838	0.1%	Rank history: not on the FY2021–FY2023 lists and #98 in FY2024; up 10 since FY2024.
89	Mountain Point, LLC Top agencies Army (Department of the Army)	$3,825,425	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
90	PB Environmental General Partnership Top agencies Army (Department of the Army)	$3,488,796	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
91	Cherokee Federal Solutions, L.L.C. Top agencies Army (Department of the Army)	$3,454,843	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
92	AGN JV LLC Top agencies Army (Department of the Army)	$3,418,886	0.1%	Rank history: not on the FY2021–FY2022 lists, #69 in FY2023 and not on the FY2024 list; up 189 since FY2024.
93	Real Model Solutions, Inc. Top agencies USAF (Department of the Air Force) Navy (Department of the Navy) DLA (Defense Logistics Agency)	$3,359,531	0.1%	Rank history: not on the FY2021–FY2023 lists and #92 in FY2024; down 1 since FY2024.
94	General Dynamics Corporation 2 awardees, including General Dynamics Information Technology, Inc. and Arcwood Environmental - Joplin, Inc. Top agencies EPA (Environmental Protection Agency) DHS (Department of Homeland Security) DOJ (Department of Justice)	$3,346,946	0.1%	Rank history: not on the FY2021–FY2023 lists and #94 in FY2024; unchanged since FY2024.
95	Sandow Construction Inc. Top agencies VA (Department of Veterans Affairs) EAC (US Election Assistance Commission)	$3,232,952	0.1%	Rank history: not on the FY2021–FY2024 lists; up 85 since FY2024.
96	Power Engineering Construction Company Top agencies DHS (Department of Homeland Security)	$3,185,958	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
97	Environmental Compliance Consultants, Inc. Top agencies Navy (Department of the Navy) Army (Department of the Army) DOI (Department of the Interior)	$3,044,947	0.1%	Rank history: #52 in FY2021, #52 in FY2022, #55 in FY2023 and #63 in FY2024; down 34 since FY2024.
98	Paragon-Jacobs Joint Venture, LLC Top agencies EPA (Environmental Protection Agency) Army (Department of the Army)	$2,971,812	0.1%	Rank history: #56 in FY2021, #40 in FY2022 and not on the FY2023–FY2024 lists; up 106 since FY2024.
99	Techlaw Consultants Inc. Top agencies EPA (Environmental Protection Agency)	$2,942,428	0.1%	Rank history: not on the FY2021–FY2023 lists and #48 in FY2024; down 51 since FY2024.
100	Red Rock Remediation JV1 Top agencies EPA (Environmental Protection Agency)	$2,845,749	0.1%	Rank history: not on the FY2021–FY2024 lists; new.

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100 of 1,168 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	$2,262,386,698	Bechtel Parsons Blue Grass, A Joint Venture
F115 Environmental Systems Protection – Environmental Consulting and Legal Support	$79,973,284	Eastern Research Group Inc.
F112 Oil Spill Response including Cleanup, Removal, Disposal and Operational Support	$69,449,411	Republic Services Inc.
F114 Environmental Systems Protection – Environmental Licensing and Permitting	$50,522,850	Tetra Tech, Inc.
F103 Water Quality Support Services	$42,355,294	Seaon Environmental LLC
F111 Industrial Investigations, Surveys and Technical Support for Multiple Pollutants	$18,644,615	Straughan Environmental, Inc.
F107 Hazardous Substance Analysis	$17,652,094	Tahkox E2-Whitetail LLC
F110 Development of Environmental Impact Statements and Assessments	$16,971,984	Pika International Inc.
F105 Pesticides Support Services	$9,638,706	Aero S E A T Inc.
F101 Air Quality Support Services	$9,177,653	Research Triangle Institute

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 $2.84 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 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.

Quick answers

Who were the top 10 PSC F1 contractors in FY2025?

1. Bechtel Parsons Blue Grass, A Joint Venture ($289M), 2. Bechtel Corp ($238M), 3. Sevenson Environmental Services, Inc. ($162M), 4. Arctic Slope Regional Corporation ($144M), 5. Environmental Restoration LLC ($103M), 6. North Wind Portage, Inc. ($95.3M), 7. Amentum Holdings, Inc. ($93.5M), 8. EA Engineering Science and Technology Inc. PBC ($82.9M), 9. Tetra Tech, Inc. ($82.3M), 10. Hydrogeologic, Inc. ($81.4M).

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