Top 100 Contractors in PSC F1: Environmental Systems Protection, Jul 2025–Jun 2026

Name: Top 100 Contractors in PSC F1: Environmental Systems Protection, Jul 2025–Jun 2026
Creator: GovTribe
License: https://creativecommons.org/licenses/by/4.0/

Parent companies by net contract obligations Jul 1, 2025 – Jun 30, 2026 Code page on GovTribe

The top 10 won 33% of PSC F1 contract dollars from July 2025 through June 2026

Contract obligations: $2,078,723,790 Net of deobligations, by contracts coded PSC F1 or a code under it
Contractors: 1,146 Parent companies with an obligation
Largest contractor: Bechtel Parsons Blue Grass, A Joint Venture $110 million, 4.4% of obligations
Data as of: Oct 16, 2026

Contract actions from FPDS (SAM.gov). How the rankings work · Download all 100 rows as CSV · Free to reuse with credit to GovTribe (CC BY 4.0)

Full ranking

Rank	Contractor	Net obligations	Share	Trend
1	Bechtel Parsons Blue Grass, A Joint Venture Top agencies Army (Department of the Army)	$109,599,732	4.4%	Rank history: not on the FY2021–FY2023 lists, #2 in FY2024 and #1 in FY2025; up 1 since Jul 2024–Jun 2025.
2	Environmental Restoration LLC Top agencies EPA (Environmental Protection Agency) DOJ (Department of Justice) Army (Department of the Army)	$107,904,714	4.4%	Rank history: #3 in FY2021, #3 in FY2022, #8 in FY2023, #11 in FY2024 and #5 in FY2025; up 12 since Jul 2024–Jun 2025.
3	North Wind Portage, Inc. Top agencies DOE (Department of Energy) Army (Department of the Army)	$91,985,973	3.7%	Rank history: not on the FY2021 list, #7 in FY2022, #50 in FY2023, #7 in FY2024 and #6 in FY2025; up 3 since Jul 2024–Jun 2025.
4	Tetra Tech, Inc. 9 awardees, including Tetra TECH EC, Inc. Top agencies Army (Department of the Army) EPA (Environmental Protection Agency) DOE (Department of Energy)	$85,663,468	3.5%	Rank history: #13 in FY2021, #15 in FY2022, #23 in FY2023, #12 in FY2024 and #9 in FY2025; up 5 since Jul 2024–Jun 2025.
5	Kemron Environmental Services Inc. 2 awardees, including Kemron / Arrowhead JV, LLC Top agencies EPA (Environmental Protection Agency) Army (Department of the Army)	$81,078,975	3.3%	Rank history: not on the FY2021–FY2023 lists, #6 in FY2024 and #16 in FY2025; up 5 since Jul 2024–Jun 2025.
6	Hydrogeologic, Inc. Top agencies EPA (Environmental Protection Agency) Army (Department of the Army) Navy (Department of the Navy)	$81,020,888	3.3%	Rank history: #2 in FY2021, #4 in FY2022, #4 in FY2023, #5 in FY2024 and #10 in FY2025; up 2 since Jul 2024–Jun 2025.
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)	$70,995,968	2.9%	Rank history: not on the FY2021–FY2024 lists and #7 in FY2025; up 6 since Jul 2024–Jun 2025.
8	Bechtel Corp Through Bechtel National, Inc. Top agencies Army (Department of the Army)	$68,453,847	2.8%	Rank history: #1 in FY2021, #1 in FY2022, #1 in FY2023, #1 in FY2024 and #2 in FY2025; down 5 since Jul 2024–Jun 2025.
9	EA Engineering Science and Technology Inc. PBC Top agencies EPA (Environmental Protection Agency) Army (Department of the Army) USAF (Department of the Air Force)	$65,474,412	2.7%	Rank history: #7 in FY2021, #2 in FY2022, #5 in FY2023, #4 in FY2024 and #8 in FY2025; down 5 since Jul 2024–Jun 2025.
10	Tehama Technical Services, LLC Top agencies EPA (Environmental Protection Agency) Army (Department of the Army)	$52,708,341	2.1%	Rank history: not on the FY2021–FY2024 lists and #46 in FY2025; up 52 since Jul 2024–Jun 2025.
11	Enviro-Fix Solutions LLC Top agencies Army (Department of the Army)	$49,701,228	2.0%	Rank history: not on the FY2021–FY2022 lists, #39 in FY2023, #37 in FY2024 and #34 in FY2025; up 109 since Jul 2024–Jun 2025.
12	Oneida Environmental, LLC Top agencies Army (Department of the Army) DOI (Department of the Interior)	$49,466,089	2.0%	Rank history: not on the FY2021–FY2024 lists and #12 in FY2025; up 84 since Jul 2024–Jun 2025.
13	Inmar RX Solutions Inc. Top agencies HHS (Department of Health and Human Services)	$40,724,002	1.6%	Rank history: not on the FY2021–FY2024 lists and #13 in FY2025; new, not ranked in Jul 2024–Jun 2025.
14	Eastern Shawnee - Bay West JV, LLC Top agencies Army (Department of the Army)	$34,283,868	1.4%	Rank history: not on the FY2021–FY2024 lists and #36 in FY2025; new, not ranked in Jul 2024–Jun 2025.
15	Weston Solutions Holdings Inc Through Weston Solutions Inc. Top agencies Army (Department of the Army) EPA (Environmental Protection Agency)	$32,787,962	1.3%	Rank history: #74 in FY2021, #36 in FY2022, #49 in FY2023, #23 in FY2024 and #44 in FY2025; new, not ranked in Jul 2024–Jun 2025.
16	Sevenson Environmental Services, Inc. Top agencies Army (Department of the Army)	$31,569,065	1.3%	Rank history: not on the FY2021–FY2022 lists, #27 in FY2023, #3 in FY2024 and #3 in FY2025; down 15 since Jul 2024–Jun 2025.
17	AECOM Technical Services, Inc. Top agencies EPA (Environmental Protection Agency) Army (Department of the Army) Commerce (Department of Commerce)	$30,795,714	1.2%	Rank history: not on the FY2021–FY2023 lists, #8 in FY2024 and #11 in FY2025; down 10 since Jul 2024–Jun 2025.
18	Promethean Operating I LLC Top agencies DOI (Department of the Interior)	$30,121,961	1.2%	Rank history: not on the FY2021–FY2023 lists, #35 in FY2024 and #35 in FY2025; up 120 since Jul 2024–Jun 2025.
19	Couvillion Group LLC Top agencies DHS (Department of Homeland Security)	$25,991,966	1.1%	Rank history: #22 in FY2021, #19 in FY2022, #22 in FY2023, #32 in FY2024 and #18 in FY2025; up 1 since Jul 2024–Jun 2025.
20	CDM Federal Programs Corporation Top agencies EPA (Environmental Protection Agency) Army (Department of the Army)	$25,508,271	1.0%	Rank history: not on the FY2021–FY2022 lists, #54 in FY2023, #20 in FY2024 and #15 in FY2025; down 5 since Jul 2024–Jun 2025.
21	Gsia-Parsons JV LLC Top agencies Army (Department of the Army)	$25,463,633	1.0%	Rank history: not on the FY2021–FY2024 lists and #23 in FY2025; new, not ranked in Jul 2024–Jun 2025.
22	Republic Services Inc. 7 awardees, including Environmental, Safety & Health Consulting Services, Inc., US Ecology Washington Inc. and US Ecology Alaska LLC Top agencies DHS (Department of Homeland Security) Army (Department of the Army) Navy (Department of the Navy)	$25,346,673	1.0%	Rank history: not on the FY2021–FY2024 lists and #17 in FY2025; down 3 since Jul 2024–Jun 2025.
23	Kfs, LLC Top agencies Army (Department of the Army)	$23,400,000	0.9%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
24	Cape Environmental Management Inc. Top agencies EPA (Environmental Protection Agency) Army (Department of the Army) Navy (Department of the Navy)	$23,334,124	0.9%	Rank history: #62 in FY2021, #26 in FY2022, not on the FY2023–FY2024 lists and #56 in FY2025; new, not ranked in Jul 2024–Jun 2025.
25	Aleut Environmental Remediation, LLC Top agencies Army (Department of the Army)	$22,408,328	0.9%	Rank history: not on the FY2021–FY2024 lists and #22 in FY2025; up 172 since Jul 2024–Jun 2025.
26	Paragon Professional Services LLC 2 awardees Top agencies EPA (Environmental Protection Agency) Army (Department of the Army) DOI (Department of the Interior)	$21,968,847	0.9%	Rank history: not on the FY2021–FY2022 lists, #34 in FY2023, #31 in FY2024 and #24 in FY2025; up 10 since Jul 2024–Jun 2025.
27	Hgl-Aptim JV LLC Top agencies Army (Department of the Army)	$21,213,816	0.9%	Rank history: #45 in FY2021, #18 in FY2022, #38 in FY2023, #17 in FY2024 and #21 in FY2025; down 3 since Jul 2024–Jun 2025.
28	Bristol Bay Native Corporation 2 awardees, including Bristol Environmental Solutions LLC Top agencies Army (Department of the Army)	$21,024,696	0.9%	Rank history: not on the FY2021–FY2022 lists, #42 in FY2023, #87 in FY2024 and #27 in FY2025; up 305 since Jul 2024–Jun 2025.
29	Guidehouse Inc. 2 awardees, including Aptim Federal Services, LLC Top agencies Navy (Department of the Navy) Army (Department of the Army)	$19,788,260	0.8%	Rank history: not on the FY2021–FY2023 lists, #45 in FY2024 and #30 in FY2025; unchanged since Jul 2024–Jun 2025.
30	Vernadero Group Inc. Top agencies DHS (Department of Homeland Security)	$19,079,506	0.8%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
31	Brice Engineering, LLC Top agencies Army (Department of the Army) DHS (Department of Homeland Security)	$18,016,152	0.7%	Rank history: #18 in FY2021, #16 in FY2022, #15 in FY2023, #49 in FY2024 and #28 in FY2025; down 3 since Jul 2024–Jun 2025.
32	Hgl-Aptim Technologies JV LLC Top agencies Army (Department of the Army) DLA (Defense Logistics Agency) DOE (Department of Energy)	$14,755,909	0.6%	Rank history: not on the FY2021–FY2024 lists and #14 in FY2025; down 11 since Jul 2024–Jun 2025.
33	Aptim Hdr, LLC Top agencies EPA (Environmental Protection Agency)	$14,310,240	0.6%	Rank history: not on the FY2021–FY2025 lists; up 185 since Jul 2024–Jun 2025.
34	C M C, Inc. Top agencies EPA (Environmental Protection Agency)	$14,024,236	0.6%	Rank history: #27 in FY2021, #12 in FY2022, #13 in FY2023, #19 in FY2024 and #60 in FY2025; down 7 since Jul 2024–Jun 2025.
35	Environmental Chemical Corporation Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$13,812,421	0.6%	Rank history: not on the FY2021–FY2022 lists, #52 in FY2023, #24 in FY2024 and #38 in FY2025; down 5 since Jul 2024–Jun 2025.
36	Ahtna Global LLC 2 awardees Top agencies Army (Department of the Army)	$13,615,378	0.6%	Rank history: not on the FY2021–FY2023 lists, #64 in FY2024 and #19 in FY2025; down 5 since Jul 2024–Jun 2025.
37	Jacobs Engineering Group Inc. 5 awardees, including Jacobs Usae Joint Venture, Ch2M Hill Constructors, Inc. and Jacobs Government Services Company Top agencies EPA (Environmental Protection Agency) Army (Department of the Army) DOI (Department of the Interior)	$13,510,374	0.5%	Rank history: not on the FY2021–FY2022 lists, #62 in FY2023, #46 in FY2024 and #29 in FY2025; up 7 since Jul 2024–Jun 2025.
38	Arrowhead Contracting, LLC Top agencies EPA (Environmental Protection Agency)	$13,197,977	0.5%	Rank history: not on the FY2021–FY2022 lists, #21 in FY2023, #79 in FY2024 and #31 in FY2025; up 9 since Jul 2024–Jun 2025.
39	J.f. Brennan Company, Inc. Top agencies EPA (Environmental Protection Agency) Army (Department of the Army)	$12,827,713	0.5%	Rank history: not on the FY2021–FY2023 lists, #21 in FY2024 and #73 in FY2025; up 69 since Jul 2024–Jun 2025.
40	Clean Harbors Inc. Through Clean Harbors Environmental Services Inc. Top agencies DHS (Department of Homeland Security) Navy (Department of the Navy) USDA (Department of Agriculture)	$12,050,303	0.5%	Rank history: not on the FY2021–FY2023 lists, #77 in FY2024 and #37 in FY2025; down 7 since Jul 2024–Jun 2025.
41	Parsons Corporation Through Parsons Government Services Inc. Top agencies Army (Department of the Army) MDA (DOD Missile Defense Agency)	$11,374,927	0.5%	Rank history: #23 in FY2021, #35 in FY2022, #36 in FY2023, #70 in FY2024 and #32 in FY2025; up 14 since Jul 2024–Jun 2025.
42	Seaon Environmental LLC Top agencies Navy (Department of the Navy)	$10,472,259	0.4%	Rank history: #49 in FY2021, #41 in FY2022, #47 in FY2023, #50 in FY2024 and #39 in FY2025; down 5 since Jul 2024–Jun 2025.
43	The Source Group, Inc. Top agencies DLA (Defense Logistics Agency)	$10,377,684	0.4%	Rank history: #43 in FY2021, #25 in FY2022, not on the FY2023 list, #69 in FY2024 and #54 in FY2025; up 33 since Jul 2024–Jun 2025.
44	Weston-Techlaw JV LLC Top agencies EPA (Environmental Protection Agency)	$9,685,736	0.4%	Rank history: not on the FY2021 list, #49 in FY2022, #31 in FY2023, #40 in FY2024 and #43 in FY2025; down 12 since Jul 2024–Jun 2025.
45	Veolia Es Technical Solutions LLC Top agencies Army (Department of the Army) DOJ (Department of Justice) EPA (Environmental Protection Agency)	$9,294,743	0.4%	Rank history: not on the FY2021–FY2024 lists and #42 in FY2025; up 20 since Jul 2024–Jun 2025.
46	Tierra Right of Way Services Ltd Top agencies DHS (Department of Homeland Security)	$9,216,243	0.4%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
47	Aes-Esfs JV II LLC Top agencies Army (Department of the Army)	$9,000,000	0.4%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
48	EQ & CH Remediation Top agencies EPA (Environmental Protection Agency)	$8,666,138	0.4%	Rank history: #25 in FY2021, #72 in FY2022, #35 in FY2023, #16 in FY2024 and not on the FY2025 list; down 30 since Jul 2024–Jun 2025.
49	Aergc JV LLC Top agencies Army (Department of the Army)	$8,326,564	0.3%	Rank history: not on the FY2021–FY2024 lists and #50 in FY2025; new, not ranked in Jul 2024–Jun 2025.
50	Triumvirate Environmental, LLC Top agencies HHS (Department of Health and Human Services) Commerce (Department of Commerce) Army (Department of the Army)	$8,263,391	0.3%	Rank history: #58 in FY2021, #70 in FY2022, #57 in FY2023, #60 in FY2024 and #59 in FY2025; up 6 since Jul 2024–Jun 2025.
51	Pika International Inc. 2 awardees, including Pika-Pirnie JV LLC Top agencies Army (Department of the Army)	$8,200,688	0.3%	Rank history: not on the FY2021–FY2023 lists, #51 in FY2024 and #55 in FY2025; up 33 since Jul 2024–Jun 2025.
52	Fpm-Aecom JV1 2 awardees, including Fpm-Aecom JV2 Top agencies Army (Department of the Army)	$8,188,194	0.3%	Rank history: not on the FY2021 list, #33 in FY2022, #24 in FY2023, #39 in FY2024 and #58 in FY2025; down 26 since Jul 2024–Jun 2025.
53	Navarro Research and Engineering, Inc. Top agencies Army (Department of the Army)	$8,136,485	0.3%	Rank history: #36 in FY2021, #34 in FY2022, #51 in FY2023, #36 in FY2024 and #47 in FY2025; up 14 since Jul 2024–Jun 2025.
54	Oneida Total Integrated Enterprises LLC Top agencies USAF (Department of the Air Force) DLA (Defense Logistics Agency) VA (Department of Veterans Affairs)	$8,093,352	0.3%	Rank history: not on the FY2021–FY2023 lists, #78 in FY2024 and #69 in FY2025; up 32 since Jul 2024–Jun 2025.
55	Pika-Insight JV LLC Top agencies Army (Department of the Army) Navy (Department of the Navy)	$7,826,785	0.3%	Rank history: not on the FY2021–FY2022 lists, #20 in FY2023 and not on the FY2024–FY2025 lists; up 26 since Jul 2024–Jun 2025.
56	Ch2M Hill, Inc. Top agencies EPA (Environmental Protection Agency) Army (Department of the Army)	$7,629,257	0.3%	Rank history: #85 in FY2021, #21 in FY2022, not on the FY2023 list, #33 in FY2024 and #41 in FY2025; down 14 since Jul 2024–Jun 2025.
57	Energysolutions Services, Inc. Top agencies Navy (Department of the Navy)	$7,271,406	0.3%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
58	Wsp-Versar JV Through Versar-Wsp JV Top agencies EPA (Environmental Protection Agency)	$6,957,457	0.3%	Rank history: not on the FY2021–FY2025 lists; up 10 since Jul 2024–Jun 2025.
59	Resolve Marine Group Inc. Top agencies DHS (Department of Homeland Security)	$6,451,995	0.3%	Rank history: #39 in FY2021, not on the FY2022–FY2023 lists, #88 in FY2024 and not on the FY2025 list; up 36 since Jul 2024–Jun 2025.
60	The Cadmus Group LLC Top agencies EPA (Environmental Protection Agency) HHS (Department of Health and Human Services)	$6,377,768	0.3%	Rank history: not on the FY2021–FY2024 lists and #81 in FY2025; up 65 since Jul 2024–Jun 2025.
61	Eastern Research Group Inc. Top agencies EPA (Environmental Protection Agency)	$6,262,951	0.3%	Rank history: #33 in FY2021, #29 in FY2022, #26 in FY2023, #15 in FY2024 and #26 in FY2025; down 45 since Jul 2024–Jun 2025.
62	Environmental Science Corporation Top agencies Navy (Department of the Navy) Army (Department of the Army)	$6,083,955	0.2%	Rank history: not on the FY2021–FY2024 lists and #65 in FY2025; up 143 since Jul 2024–Jun 2025.
63	Fidelis-Bbd, LLC Top agencies EPA (Environmental Protection Agency)	$6,030,015	0.2%	Rank history: not on the FY2021–FY2024 lists and #61 in FY2025; new, not ranked in Jul 2024–Jun 2025.
64	Oneida-Stantec JV LLC Top agencies Army (Department of the Army)	$5,790,532	0.2%	Rank history: not on the FY2021–FY2024 lists and #70 in FY2025; new, not ranked in Jul 2024–Jun 2025.
65	Calista Corp 2 awardees, including Brice Environmental Services Corporation Top agencies Army (Department of the Army)	$5,781,050	0.2%	Rank history: #60 in FY2021, not on the FY2022–FY2023 lists, #90 in FY2024 and not on the FY2025 list; up 17 since Jul 2024–Jun 2025.
66	Conti Federal Services, LLC Top agencies EPA (Environmental Protection Agency)	$5,677,666	0.2%	Rank history: not on the FY2021–FY2023 lists, #26 in FY2024 and #20 in FY2025; down 41 since Jul 2024–Jun 2025.
67	Gulf South Research Corp Top agencies DHS (Department of Homeland Security) DOI (Department of the Interior)	$5,603,492	0.2%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
68	Sargent Corporation Top agencies Army (Department of the Army)	$5,414,000	0.2%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
69	LPS Kemron JV LLC Top agencies EPA (Environmental Protection Agency)	$5,411,026	0.2%	Rank history: not on the FY2021–FY2024 lists and #67 in FY2025; unchanged since Jul 2024–Jun 2025.
70	Bay West LLC Top agencies Army (Department of the Army) DOJ (Department of Justice)	$5,367,876	0.2%	Rank history: not on the FY2021–FY2024 lists and #85 in FY2025; up 77 since Jul 2024–Jun 2025.
71	A and M Engineering & Environmental Services, Inc. Top agencies EPA (Environmental Protection Agency)	$5,239,200	0.2%	Rank history: #41 in FY2021, #39 in FY2022, not on the FY2023 list, #56 in FY2024 and #53 in FY2025; down 20 since Jul 2024–Jun 2025.
72	Inspection Experts Inc. Top agencies DHS (Department of Homeland Security) Army (Department of the Army) Navy (Department of the Navy)	$5,231,910	0.2%	Rank history: not on the FY2021–FY2024 lists and #68 in FY2025; new, not ranked in Jul 2024–Jun 2025.
73	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 and #71 in FY2025; new, not ranked in Jul 2024–Jun 2025.
74	Ahtna-Arcadis 8(A) JV, LLC Top agencies Army (Department of the Army)	$5,117,664	0.2%	Rank history: not on the FY2021–FY2022 lists, #87 in FY2023, #38 in FY2024 and #62 in FY2025; down 4 since Jul 2024–Jun 2025.
75	Research Triangle Institute Top agencies EPA (Environmental Protection Agency)	$5,046,564	0.2%	Rank history: #84 in FY2021, #43 in FY2022, #33 in FY2023, #53 in FY2024 and #52 in FY2025; down 29 since Jul 2024–Jun 2025.
76	ECO & Associates, Inc. Top agencies DHS (Department of Homeland Security)	$4,954,044	0.2%	Rank history: not on the FY2021–FY2025 lists; up 174 since Jul 2024–Jun 2025.
77	Charter Contracting Company, LLC Top agencies Army (Department of the Army)	$4,940,000	0.2%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
78	Williams Diversified Materials, Inc. Top agencies EPA (Environmental Protection Agency)	$4,849,351	0.2%	Rank history: not on the FY2021–FY2025 lists; up 26 since Jul 2024–Jun 2025.
79	Bayside-Errg JV Top agencies DOI (Department of the Interior)	$4,549,842	0.2%	Rank history: not on the FY2021–FY2024 lists and #75 in FY2025; new, not ranked in Jul 2024–Jun 2025.
80	Hdr, Inc. 2 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)	$4,463,654	0.2%	Rank history: #28 in FY2021, #24 in FY2022, #30 in FY2023, #72 in FY2024 and not on the FY2025 list; down 23 since Jul 2024–Jun 2025.
81	Chemtrack Alaska, Inc. Top agencies USAF (Department of the Air Force) DOT (Department of Transportation)	$4,328,541	0.2%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
82	3D Envirologics LLC Top agencies HHS (Department of Health and Human Services)	$4,309,856	0.2%	Rank history: not on the FY2021–FY2024 lists and #64 in FY2025; up 12 since Jul 2024–Jun 2025.
83	Property & Environmental Management Inc. Top agencies HHS (Department of Health and Human Services) Treasury (Department of the Treasury)	$4,304,012	0.2%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
84	Cape-Weston JV3 LLC Top agencies Navy (Department of the Navy)	$4,243,772	0.2%	Rank history: not on the FY2021–FY2024 lists and #49 in FY2025; down 34 since Jul 2024–Jun 2025.
85	GSI North America Inc. Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$4,093,785	0.2%	Rank history: not on the FY2021–FY2023 lists, #61 in FY2024 and #79 in FY2025; up 16 since Jul 2024–Jun 2025.
86	C & C Environmental Inc. Top agencies Army (Department of the Army) EPA (Environmental Protection Agency)	$4,068,470	0.2%	Rank history: #67 in FY2021, #82 in FY2022, #90 in FY2023, #100 in FY2024 and #76 in FY2025; down 15 since Jul 2024–Jun 2025.
87	Bluestone - Burns & Mcdonnell JV Top agencies EPA (Environmental Protection Agency)	$3,967,080	0.2%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
88	Orin Technologies, Llc. Top agencies USAF (Department of the Air Force)	$3,958,040	0.2%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
89	Mountain Point, LLC Top agencies Army (Department of the Army)	$3,951,515	0.2%	Rank history: not on the FY2021–FY2024 lists and #89 in FY2025; new, not ranked in Jul 2024–Jun 2025.
90	Engineering/Remediation Resources Group Inc. Top agencies Navy (Department of the Navy) USDA (Department of Agriculture) Army (Department of the Army)	$3,750,731	0.2%	Rank history: #92 in FY2021, #42 in FY2022, not on the FY2023 list, #43 in FY2024 and #72 in FY2025; down 32 since Jul 2024–Jun 2025.
91	Dawson Solutions LLC Top agencies Army (Department of the Army)	$3,664,373	0.1%	Rank history: not on the FY2021–FY2023 lists, #25 in FY2024 and #86 in FY2025; down 69 since Jul 2024–Jun 2025.
92	Noreas Environmental Services LLC Top agencies Army (Department of the Army)	$3,607,874	0.1%	Rank history: not on the FY2021–FY2022 lists, #46 in FY2023, #47 in FY2024 and #40 in FY2025; down 51 since Jul 2024–Jun 2025.
93	Straughan Environmental, Inc. Top agencies NASA (National Aeronautics and Space Administration)	$3,587,278	0.1%	Rank history: #78 in FY2021, #83 in FY2022, #94 in FY2023, not on the FY2024 list and #80 in FY2025; up 13 since Jul 2024–Jun 2025.
94	PB Environmental General Partnership Top agencies Army (Department of the Army)	$3,488,796	0.1%	Rank history: not on the FY2021–FY2024 lists and #90 in FY2025; new, not ranked in Jul 2024–Jun 2025.
95	Koman Government Solutions LLC Top agencies Army (Department of the Army) DHS (Department of Homeland Security)	$3,466,184	0.1%	Rank history: not on the FY2021–FY2025 lists; up 35 since Jul 2024–Jun 2025.
96	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 and #91 in FY2025; new, not ranked in Jul 2024–Jun 2025.
97	S C & A Inc. Top agencies EPA (Environmental Protection Agency) DHS (Department of Homeland Security) DOE (Department of Energy)	$3,266,667	0.1%	Rank history: not on the FY2021–FY2022 lists, #67 in FY2023, #74 in FY2024 and not on the FY2025 list; down 19 since Jul 2024–Jun 2025.
98	Heliotech Top agencies EPA (Environmental Protection Agency)	$3,256,383	0.1%	Rank history: not on the FY2021–FY2023 lists, #97 in FY2024 and not on the FY2025 list; up 14 since Jul 2024–Jun 2025.
99	JFL-WCS Partners LLC Through Waste Control Specialists LLC Top agencies Army (Department of the Army)	$3,224,434	0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
100	Del Mar-Trevet-Jv LLC Top agencies Navy (Department of the Navy)	$3,223,608	0.1%	Rank history: not on the FY2021–FY2025 lists; up 58 since Jul 2024–Jun 2025.

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100 of 1,146 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	$1,722,005,875	Bechtel Parsons Blue Grass, A Joint Venture
F115 Environmental Systems Protection – Environmental Consulting and Legal Support	$69,852,564	Weston-Techlaw JV LLC
F114 Environmental Systems Protection – Environmental Licensing and Permitting	$61,555,041	Tetra Tech, Inc.
F112 Oil Spill Response including Cleanup, Removal, Disposal and Operational Support	$58,046,674	Republic Services Inc.
F110 Development of Environmental Impact Statements and Assessments	$56,996,167	Vernadero Group Inc.
F103 Water Quality Support Services	$29,885,373	Versar-Envirocon JV
F111 Industrial Investigations, Surveys and Technical Support for Multiple Pollutants	$17,367,026	Mountain Point, LLC
F107 Hazardous Substance Analysis	$14,905,181	Brice Integrated LLC
F105 Pesticides Support Services	$10,958,581	CDS Services Inc.
F101 Air Quality Support Services	$7,594,644	Q & A Diversified LLC

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 $2.47 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.
Period: the trailing 12 months end with the last month that ended at least 90 days ago, because the Department of Defense reports its contract actions to FPDS about 90 days late. The list is rebuilt each night.
Rank changes compare with Jul 2024–Jun 2025. "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.
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 Jul 2025–Jun 2026?

1. Bechtel Parsons Blue Grass, A Joint Venture ($110M), 2. Environmental Restoration LLC ($108M), 3. North Wind Portage, Inc. ($92M), 4. Tetra Tech, Inc. ($85.7M), 5. Kemron Environmental Services Inc. ($81.1M), 6. Hydrogeologic, Inc. ($81M), 7. Amentum Holdings, Inc. ($71M), 8. Bechtel Corp ($68.5M), 9. EA Engineering Science and Technology Inc. PBC ($65.5M), 10. Tehama Technical Services, LLC ($52.7M).

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