Top 100 Contractors in PSC F1: Environmental Systems Protection, FY2023

Name: Top 100 Contractors in PSC F1: Environmental Systems Protection, FY2023
Creator: GovTribe

Parent companies by net contract obligations Oct 1, 2022 – Sep 30, 2023 Code page on GovTribe

The top 10 won 52% of FY2023 PSC F1 contract dollars

Contract obligations: $2,973,111,620 Net of deobligations, by contracts coded PSC F1 or a code under it
Contractors: 1,256 Parent companies with an obligation
Largest contractor: Bechtel Corp $836 million, 27.1% 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)	$836,266,723	27.1%	Rank history: #1 in FY2021, #1 in FY2022, #1 in FY2024 and #2 in FY2025; unchanged since FY2022.
2	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) DOI (Department of the Interior)	$129,226,241	4.2%	Rank history: #6 in FY2021, #17 in FY2022, #14 in FY2024 and not on the FY2025 list; up 15 since FY2022.
3	AECOM 5 awardees, including AECOM Technical Services, Inc., Amentum Environment & Energy, Inc. and Aecom-Atkins Joint Venture Top agencies EPA (Environmental Protection Agency) DOT (Department of Transportation) DHS (Department of Homeland Security)	$113,801,624	3.7%	Rank history: #37 in FY2021, #5 in FY2022, #52 in FY2024 and not on the FY2025 list; up 2 since FY2022.
4	Hydrogeologic, Inc. Top agencies Army (Department of the Army) EPA (Environmental Protection Agency)	$108,513,467	3.5%	Rank history: #2 in FY2021, #4 in FY2022, #5 in FY2024 and #10 in FY2025; unchanged since FY2022.
5	EA Engineering, Science, and Technology, Inc., PBC Top agencies EPA (Environmental Protection Agency) Navy (Department of the Navy) Army (Department of the Army)	$92,314,591	3.0%	Rank history: #7 in FY2021, #2 in FY2022, #4 in FY2024 and #8 in FY2025; down 3 since FY2022.
6	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) DOI (Department of the Interior)	$73,815,725	2.4%	Rank history: #9 in FY2021, #32 in FY2022, #28 in FY2024 and #4 in FY2025; up 26 since FY2022.
7	Nelson Environmental Remediation USA Ltd Top agencies USAID (US Agency for International Development)	$71,013,106	2.3%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
8	Environmental Restoration LLC Top agencies EPA (Environmental Protection Agency) DOJ (Department of Justice)	$63,523,616	2.1%	Rank history: #3 in FY2021, #3 in FY2022, #11 in FY2024 and #5 in FY2025; down 5 since FY2022.
9	Cook Inlet Region Inc. 3 awardees, including North Wind Portage, Inc. Top agencies DOE (Department of Energy) Army (Department of the Army)	$53,809,721	1.7%	Rank history: #5 in FY2021, #13 in FY2022, #13 in FY2024 and not on the FY2025 list; up 4 since FY2022.
10	CDM Smith Inc Through CDM Federal Programs Corporation Top agencies EPA (Environmental Protection Agency)	$49,756,139	1.6%	Rank history: not on the FY2021–FY2022 lists, #58 in FY2024 and not on the FY2025 list; new.
11	Aptim AECOM Decommissioning, LLC Top agencies Army (Department of the Army)	$48,732,607	1.6%	Rank history: #8 in FY2021, not on the FY2022 list and not on the FY2024–FY2025 lists; up 267 since FY2022.
12	Oneida Nation 3 awardees, including Sustainment & Restoration Services, LLC, OCH JV and Oneida Total Integrated Enterprises LLC Top agencies Army (Department of the Army) EPA (Environmental Protection Agency) USAF (Department of the Air Force)	$43,498,555	1.4%	Rank history: #16 in FY2021, #9 in FY2022, #42 in FY2024 and not on the FY2025 list; down 3 since FY2022.
13	C M C, Inc. Top agencies EPA (Environmental Protection Agency)	$42,663,299	1.4%	Rank history: #27 in FY2021, #12 in FY2022, #19 in FY2024 and #60 in FY2025; down 1 since FY2022.
14	Kemron / Arrowhead JV, LLC Top agencies EPA (Environmental Protection Agency)	$39,785,837	1.3%	Rank history: #40 in FY2021, #20 in FY2022 and not on the FY2024–FY2025 lists; up 6 since FY2022.
15	Brice Engineering, LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force) DHS (Department of Homeland Security)	$36,754,107	1.2%	Rank history: #18 in FY2021, #16 in FY2022, #49 in FY2024 and #28 in FY2025; up 1 since FY2022.
16	Amentum Services, Inc. Top agencies Army (Department of the Army) DHS (Department of Homeland Security)	$31,701,841	1.0%	Rank history: #38 in FY2021, #6 in FY2022 and not on the FY2024–FY2025 lists; down 10 since FY2022.
17	Aptim Federal Services LLC 2 awardees Top agencies Army (Department of the Army) Navy (Department of the Navy)	$31,260,583	1.0%	Rank history: #31 in FY2021, #10 in FY2022 and not on the FY2024–FY2025 lists; down 7 since FY2022.
18	Veterans Holding Group LLC Through Relyant Global LLC Top agencies Army (Department of the Army)	$29,776,456	1.0%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
19	Inmar Clearing Inc. Through Inmar RX Solutions Inc. Top agencies HHS (Department of Health and Human Services)	$29,565,120	1.0%	Rank history: not on the FY2021–FY2022 lists, #18 in FY2024 and not on the FY2025 list; new.
20	Pika-Insight JV LLC Top agencies Army (Department of the Army) Navy (Department of the Navy)	$26,017,594	0.8%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; up 195 since FY2022.
21	Arrowhead Contracting, LLC Top agencies EPA (Environmental Protection Agency)	$25,843,246	0.8%	Rank history: not on the FY2021–FY2022 lists, #79 in FY2024 and #31 in FY2025; new.
22	Couvillion Group LLC Top agencies DHS (Department of Homeland Security)	$25,724,737	0.8%	Rank history: #22 in FY2021, #19 in FY2022, #32 in FY2024 and #18 in FY2025; down 3 since FY2022.
23	Tetra Tech, Inc. 9 awardees, including Tetra TECH EC, Inc. Top agencies Army (Department of the Army) EPA (Environmental Protection Agency) USAF (Department of the Air Force)	$25,656,699	0.8%	Rank history: #13 in FY2021, #15 in FY2022, #12 in FY2024 and #9 in FY2025; down 8 since FY2022.
24	Fpm-Aecom JV1 Top agencies Army (Department of the Army)	$25,226,264	0.8%	Rank history: not on the FY2021 list, #33 in FY2022, #39 in FY2024 and #58 in FY2025; up 9 since FY2022.
25	Kemron Environmental Services, Inc. Top agencies EPA (Environmental Protection Agency) Army (Department of the Army)	$25,024,543	0.8%	Rank history: #11 in FY2021, #14 in FY2022 and not on the FY2024–FY2025 lists; down 11 since FY2022.
26	Eastern Research Group Inc. Top agencies EPA (Environmental Protection Agency) DOI (Department of the Interior)	$22,262,451	0.7%	Rank history: #33 in FY2021, #29 in FY2022, #15 in FY2024 and #26 in FY2025; up 3 since FY2022.
27	Sevenson Environmental Services, Inc. Top agencies Army (Department of the Army) EPA (Environmental Protection Agency)	$22,159,160	0.7%	Rank history: not on the FY2021–FY2022 lists, #3 in FY2024 and #3 in FY2025; new.
28	Asrc Consulting & Environmental Services LLC Top agencies DOI (Department of the Interior)	$19,447,132	0.6%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
29	Leidos Holdings, Inc. 3 awardees, including Leidos, Inc. and Leidos-Cdm Solutions LLC Top agencies Army (Department of the Army) DOE (Department of Energy) USAF (Department of the Air Force)	$17,745,767	0.6%	Rank history: #20 in FY2021, #56 in FY2022, #62 in FY2024 and not on the FY2025 list; up 27 since FY2022.
30	Hdr, Inc. 4 awardees, including HDR Aptim LLC and HDR Environmental, Operations and Construction, Inc. Top agencies EPA (Environmental Protection Agency) Army (Department of the Army) Navy (Department of the Navy)	$15,523,826	0.5%	Rank history: #28 in FY2021, #24 in FY2022, #72 in FY2024 and not on the FY2025 list; down 6 since FY2022.
31	Weston-Techlaw JV LLC Top agencies EPA (Environmental Protection Agency)	$15,452,244	0.5%	Rank history: not on the FY2021 list, #49 in FY2022, #40 in FY2024 and #43 in FY2025; up 18 since FY2022.
32	A and M Engineering & Environmental Services Inc Top agencies EPA (Environmental Protection Agency)	$13,920,364	0.5%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
33	Research Triangle Institute Top agencies EPA (Environmental Protection Agency)	$13,700,039	0.4%	Rank history: #84 in FY2021, #43 in FY2022, #53 in FY2024 and #52 in FY2025; up 10 since FY2022.
34	Paragon Professional Services LLC Top agencies EPA (Environmental Protection Agency) Army (Department of the Army)	$12,972,469	0.4%	Rank history: not on the FY2021–FY2022 lists, #31 in FY2024 and #24 in FY2025; up 409 since FY2022.
35	EQ & CH Remediation Top agencies EPA (Environmental Protection Agency)	$12,831,525	0.4%	Rank history: #25 in FY2021, #72 in FY2022, #16 in FY2024 and not on the FY2025 list; up 37 since FY2022.
36	Parsons Corporation Through Parsons Government Services Inc. Top agencies MDA (DOD Missile Defense Agency) Army (Department of the Army)	$12,420,021	0.4%	Rank history: #23 in FY2021, #35 in FY2022, #70 in FY2024 and #32 in FY2025; down 1 since FY2022.
37	Brice Solutions, LLC Top agencies DOT (Department of Transportation)	$12,116,458	0.4%	Rank history: not on the FY2021 list, #69 in FY2022, #34 in FY2024 and #83 in FY2025; up 32 since FY2022.
38	Hgl-Aptim JV LLC Top agencies Army (Department of the Army) DLA (Defense Logistics Agency)	$12,004,949	0.4%	Rank history: #45 in FY2021, #18 in FY2022, #17 in FY2024 and #21 in FY2025; down 20 since FY2022.
39	Enviro-Fix Solutions LLC Top agencies Army (Department of the Army)	$11,984,342	0.4%	Rank history: not on the FY2021–FY2022 lists, #37 in FY2024 and #34 in FY2025; new.
40	Noreas Aptim Environmental Remediation JV Top agencies EPA (Environmental Protection Agency) Navy (Department of the Navy)	$11,908,205	0.4%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; up 99 since FY2022.
41	Energysolutions LLC 2 awardees, including Energysolutions Services, Inc. Top agencies Navy (Department of the Navy)	$11,250,828	0.4%	Rank history: #34 in FY2021, #31 in FY2022 and not on the FY2024–FY2025 lists; down 10 since FY2022.
42	Bristol Bay Native Corporation 2 awardees, including Bristol Environmental Solutions LLC and Bristol Site Contractors, LLC Top agencies Army (Department of the Army)	$10,795,661	0.4%	Rank history: not on the FY2021–FY2022 lists, #87 in FY2024 and #27 in FY2025; new.
43	ST George Tanaq Corp 2 awardees, including Tanaq Environmental LLC and Heliotech Top agencies Army (Department of the Army) EPA (Environmental Protection Agency) Navy (Department of the Navy)	$10,608,712	0.3%	Rank history: #96 in FY2021, #51 in FY2022 and not on the FY2024–FY2025 lists; up 8 since FY2022.
44	Ahtna Solutions, LLC Top agencies Army (Department of the Army) DOT (Department of Transportation) Commerce (Department of Commerce)	$10,200,793	0.3%	Rank history: not on the FY2021–FY2022 lists, #65 in FY2024 and #48 in FY2025; new.
45	Ahtna, Incorporated 3 awardees, including Ahtna Global LLC, Ahtna Engineering Services, LLC and Ahtna Environmental, Inc. Top agencies Army (Department of the Army) DOT (Department of Transportation)	$9,777,227	0.3%	Rank history: #24 in FY2021, #45 in FY2022 and not on the FY2024–FY2025 lists; unchanged since FY2022.
46	Noreas Environmental Services LLC Top agencies Army (Department of the Army)	$9,769,313	0.3%	Rank history: not on the FY2021–FY2022 lists, #47 in FY2024 and #40 in FY2025; new.
47	Seaon Environmental LLC Top agencies Navy (Department of the Navy)	$9,581,813	0.3%	Rank history: #49 in FY2021, #41 in FY2022, #50 in FY2024 and #39 in FY2025; down 6 since FY2022.
48	CTL Environmental LLC Top agencies Army (Department of the Army)	$9,394,818	0.3%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; up 84 since FY2022.
49	Weston Solutions Holdings, Inc. Through Weston Solutions Inc. Top agencies EPA (Environmental Protection Agency) Army (Department of the Army)	$9,114,634	0.3%	Rank history: #74 in FY2021, #36 in FY2022, #23 in FY2024 and #44 in FY2025; down 13 since FY2022.
50	North Wind Portage, Inc. Top agencies DOE (Department of Energy)	$9,076,079	0.3%	Rank history: not on the FY2021 list, #7 in FY2022, #7 in FY2024 and #6 in FY2025; down 43 since FY2022.
51	Navarro Research and Engineering, Inc. Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$8,801,605	0.3%	Rank history: #36 in FY2021, #34 in FY2022, #36 in FY2024 and #47 in FY2025; down 17 since FY2022.
52	Environmental Chemical Corporation 4 awardees, including ECC Environmental LLC Top agencies Army (Department of the Army) MDA (DOD Missile Defense Agency)	$8,663,343	0.3%	Rank history: not on the FY2021–FY2022 lists, #24 in FY2024 and #38 in FY2025; up 192 since FY2022.
53	Versar-Envirocon JV Top agencies EPA (Environmental Protection Agency)	$8,510,801	0.3%	Rank history: not on the FY2021 list, #88 in FY2022 and not on the FY2024–FY2025 lists; up 35 since FY2022.
54	CDM Federal Programs Corporation Top agencies EPA (Environmental Protection Agency)	$7,512,709	0.2%	Rank history: not on the FY2021–FY2022 lists, #20 in FY2024 and #15 in FY2025; up 220 since FY2022.
55	Environmental Compliance Consultants, Inc. Top agencies Army (Department of the Army) Navy (Department of the Navy) DOI (Department of the Interior)	$7,297,985	0.2%	Rank history: #52 in FY2021, #52 in FY2022, #63 in FY2024 and #97 in FY2025; down 3 since FY2022.
56	Mission Support Services LLC Through Oneida Total Integrated Enterprises LLC Top agencies USAF (Department of the Air Force) VA (Department of Veterans Affairs)	$6,843,407	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
57	Triumvirate Environmental, LLC Top agencies HHS (Department of Health and Human Services) Commerce (Department of Commerce) Army (Department of the Army)	$6,770,626	0.2%	Rank history: #58 in FY2021, #70 in FY2022, #60 in FY2024 and #59 in FY2025; up 13 since FY2022.
58	Seres-Arcadis SB JV, LLC Top agencies Army (Department of the Army)	$6,766,760	0.2%	Rank history: #99 in FY2021, not on the FY2022 list and not on the FY2024–FY2025 lists; up 75 since FY2022.
59	Natives of Kodiak, Incorporated 2 awardees, including Environmental Assessment Services, LLC and Koman Government Solutions LLC Top agencies Army (Department of the Army) Navy (Department of the Navy)	$6,696,891	0.2%	Rank history: #71 in FY2021, #68 in FY2022 and not on the FY2024–FY2025 lists; up 9 since FY2022.
60	Splut Inc. Top agencies Army (Department of the Army)	$6,666,000	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
61	Sol Solutions, LLC Top agencies Army (Department of the Army)	$6,554,479	0.2%	Rank history: #48 in FY2021, #54 in FY2022 and not on the FY2024–FY2025 lists; down 7 since FY2022.
62	Jacobs Government Services Company 2 awardees, including Ch2M Hill Constructors, Inc. Top agencies Army (Department of the Army)	$6,428,056	0.2%	Rank history: not on the FY2021–FY2022 lists, #46 in FY2024 and #29 in FY2025; new.
63	Battelle Memorial Institute Top agencies HHS (Department of Health and Human Services)	$6,056,211	0.2%	Rank history: #30 in FY2021, #44 in FY2022 and not on the FY2024–FY2025 lists; down 19 since FY2022.
64	Sevenson-Usa Environmental Joint Venture Top agencies Army (Department of the Army)	$5,961,879	0.2%	Rank history: #19 in FY2021, #57 in FY2022 and not on the FY2024–FY2025 lists; down 7 since FY2022.
65	Cabrera Services Inc. Top agencies Army (Department of the Army)	$5,934,112	0.2%	Rank history: #17 in FY2021, #8 in FY2022 and not on the FY2024–FY2025 lists; down 57 since FY2022.
66	US Ecology, Inc. 5 awardees, including NRC Environmental Services Inc., NRC Gulf Environmental Services Inc. and US Ecology Washington Inc. Top agencies DHS (Department of Homeland Security) DLA (Defense Logistics Agency) Navy (Department of the Navy)	$5,907,561	0.2%	Rank history: not on the FY2021 list, #98 in FY2022 and not on the FY2024–FY2025 lists; up 32 since FY2022.
67	S C & A Inc. Top agencies DHS (Department of Homeland Security) EPA (Environmental Protection Agency) DOE (Department of Energy)	$5,899,116	0.2%	Rank history: not on the FY2021–FY2022 lists, #74 in FY2024 and not on the FY2025 list; up 55 since FY2022.
68	The Aleut Corporation 2 awardees, including Aleut Remediation LLC Top agencies Army (Department of the Army)	$5,876,869	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; up 102 since FY2022.
69	AGN JV LLC Top agencies Army (Department of the Army)	$5,848,240	0.2%	Rank history: not on the FY2021–FY2022 lists, not on the FY2024 list and #92 in FY2025; new.
70	HGS Engineering Inc. Top agencies Navy (Department of the Navy) VA (Department of Veterans Affairs) DLA (Defense Logistics Agency)	$5,446,171	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
71	Specpro-Ayuda JV, LLC Top agencies EPA (Environmental Protection Agency)	$5,248,028	0.2%	Rank history: not on the FY2021–FY2022 lists, #57 in FY2024 and not on the FY2025 list; new.
72	Advanced Chemical Transport LLC Top agencies DOI (Department of the Interior) DOJ (Department of Justice)	$5,140,260	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
73	Ciri Development Corporation 7 awardees, including North Wind-Ea JV, LLC, North Wind Site Services, LLC and North Wind Resource Consulting LLC Top agencies Army (Department of the Army) DOI (Department of the Interior) USDA (Department of Agriculture)	$5,055,359	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; up 195 since FY2022.
74	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) VA (Department of Veterans Affairs) DHS (Department of Homeland Security)	$5,017,251	0.2%	Rank history: #93 in FY2021, #61 in FY2022 and not on the FY2024–FY2025 lists; down 13 since FY2022.
75	KGS Seres 8A JV LLC Top agencies Army (Department of the Army)	$5,003,280	0.2%	Rank history: #59 in FY2021, #64 in FY2022, #80 in FY2024 and not on the FY2025 list; down 11 since FY2022.
76	Brice Aptim JV LLC Top agencies DLA (Defense Logistics Agency)	$4,966,509	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
77	Paragon Central JV, LLC Top agencies Army (Department of the Army)	$4,886,035	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
78	Otie-Pwt JV, LLC Top agencies EPA (Environmental Protection Agency)	$4,800,193	0.2%	Rank history: not on the FY2021 list, #65 in FY2022 and not on the FY2024–FY2025 lists; down 13 since FY2022.
79	Moran Environmental Recovery, LLC Top agencies DHS (Department of Homeland Security) USAF (Department of the Air Force)	$4,774,185	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; up 148 since FY2022.
80	Whitetail Environmental, LLC Top agencies Army (Department of the Army) DOI (Department of the Interior) DHA (Defense Health Agency)	$4,718,312	0.2%	Rank history: not on the FY2021 list, #75 in FY2022 and not on the FY2024–FY2025 lists; down 5 since FY2022.
81	Arcadis N.V. Through Arcadis U.s., Inc. Top agencies DHS (Department of Homeland Security) USAF (Department of the Air Force) Army (Department of the Army)	$4,659,349	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
82	Resource Environmental Solutions LLC Through HGS LLC Top agencies GSA (General Services Administration)	$4,634,409	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
83	Better By Design LLC Top agencies EPA (Environmental Protection Agency)	$4,613,576	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
84	Pi3E JV LLP Top agencies HHS (Department of Health and Human Services) Navy (Department of the Navy)	$4,611,942	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; up 239 since FY2022.
85	Applied Research Associates, Inc. Top agencies DOI (Department of the Interior)	$4,567,265	0.1%	Rank history: #26 in FY2021, #58 in FY2022, #71 in FY2024 and #66 in FY2025; down 27 since FY2022.
86	USA Environmental, Inc. Top agencies Army (Department of the Army) Navy (Department of the Navy)	$4,507,913	0.1%	Rank history: not on the FY2021 list, #66 in FY2022 and not on the FY2024–FY2025 lists; down 20 since FY2022.
87	Ahtna-Arcadis 8(A) JV, LLC Top agencies Army (Department of the Army)	$4,448,977	0.1%	Rank history: not on the FY2021–FY2022 lists, #38 in FY2024 and #62 in FY2025; new.
88	RSI Remediation, LLC Top agencies Navy (Department of the Navy)	$4,363,623	0.1%	Rank history: not on the FY2021–FY2022 lists, #68 in FY2024 and not on the FY2025 list; new.
89	Toeroek Associates, Inc. Top agencies EPA (Environmental Protection Agency)	$4,181,425	0.1%	Rank history: not on the FY2021 list, #79 in FY2022 and not on the FY2024–FY2025 lists; down 10 since FY2022.
90	C & C Environmental Inc. Top agencies Army (Department of the Army) EPA (Environmental Protection Agency)	$4,177,086	0.1%	Rank history: #67 in FY2021, #82 in FY2022, #100 in FY2024 and #76 in FY2025; down 8 since FY2022.
91	Techlaw, Inc. Through Techlaw Consultants Inc. Top agencies EPA (Environmental Protection Agency)	$4,174,046	0.1%	Rank history: #76 in FY2021, #85 in FY2022 and not on the FY2024–FY2025 lists; down 6 since FY2022.
92	Aerostar Environmental and Construction LLC Top agencies USAF (Department of the Air Force) HHS (Department of Health and Human Services) Army (Department of the Army)	$4,076,533	0.1%	Rank history: not on the FY2021–FY2022 lists, not on the FY2024 list and #33 in FY2025; up 42 since FY2022.
93	North Wind-Cdm Advantage JV, LLC Top agencies Army (Department of the Army)	$3,956,663	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
94	Straughan Environmental, Inc. Top agencies NASA (National Aeronautics and Space Administration)	$3,939,991	0.1%	Rank history: #78 in FY2021, #83 in FY2022, not on the FY2024 list and #80 in FY2025; down 11 since FY2022.
95	PCI Bhate JV LLC Top agencies USAF (Department of the Air Force)	$3,756,357	0.1%	Rank history: not on the FY2021–FY2022 lists, not on the FY2024 list and #63 in FY2025; new.
96	Tanaq-Sundance 8(A) Joint Venture, LLC Top agencies Army (Department of the Army)	$3,723,737	0.1%	Rank history: not on the FY2021–FY2022 lists, #67 in FY2024 and not on the FY2025 list; up 67 since FY2022.
97	Municipal Base Services LLC Top agencies Army (Department of the Army)	$3,722,894	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
98	Pika International, Inc. Top agencies Army (Department of the Army)	$3,707,417	0.1%	Rank history: #42 in FY2021, #38 in FY2022 and not on the FY2024–FY2025 lists; down 60 since FY2022.
99	Applied Technology, Inc. Top agencies Navy (Department of the Navy) Army (Department of the Army)	$3,671,373	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; up 89 since FY2022.
100	ABT Global LLC 2 awardees Top agencies EPA (Environmental Protection Agency)	$3,669,650	0.1%	Rank history: #73 in FY2021, not on the FY2022 list and not on the FY2024–FY2025 lists; up 2 since FY2022.

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100 of 1,256 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	$2,664,061,296	Bechtel Corp
F115 Environmental Systems Protection – Environmental Consulting and Legal Support	$106,118,046	Weston-Techlaw JV LLC
F112 Oil Spill Response including Cleanup, Removal, Disposal and Operational Support	$53,411,036	Couvillion Group LLC
F103 Water Quality Support Services	$32,841,980	Seaon Environmental LLC
F110 Development of Environmental Impact Statements and Assessments	$27,724,705	Leidos Holdings, Inc.
F101 Air Quality Support Services	$20,608,072	Eastern Research Group Inc.
F107 Hazardous Substance Analysis	$16,472,235	Ones Whitetail Joint Venture LLC
F105 Pesticides Support Services	$11,175,115	Gulf South Research Corp
F114 Environmental Systems Protection – Environmental Licensing and Permitting	$3,277,661	Pacific Commercial Services, 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 $3.08 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 2023 ran Oct 1, 2022 – Sep 30, 2023. 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 FY2022. "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 FY2022 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 FY2023?

1. Bechtel Corp ($836M), 2. Jacobs Engineering Group Inc. ($129M), 3. AECOM ($114M), 4. Hydrogeologic, Inc. ($109M), 5. EA Engineering, Science, and Technology, Inc., PBC ($92.3M), 6. Arctic Slope Regional Corporation ($73.8M), 7. Nelson Environmental Remediation USA Ltd ($71M), 8. Environmental Restoration LLC ($63.5M), 9. Cook Inlet Region Inc. ($53.8M), 10. CDM Smith Inc ($49.8M).

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