Top 100 Contractors in NAICS 5622: Waste Treatment and Disposal, FY2025

Name: Top 100 Contractors in NAICS 5622: Waste Treatment and Disposal, FY2025
Creator: GovTribe
License: https://creativecommons.org/licenses/by/4.0/

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

The top 10 won 84% of FY2025 NAICS 5622 contract dollars

Contract obligations: $1,938,311,939 Net of deobligations, by contracts coded NAICS 5622 or a code under it
Contractors: 450 Parent companies with an obligation
Largest contractor: Hanford Tank Waste Operations & Closure, LLC $796 million, 39.4% of obligations
Data as of: Oct 23, 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	Hanford Tank Waste Operations & Closure, LLC Top agencies DOE (Department of Energy)	$796,035,008	39.4%	Rank history: not on the FY2021–FY2022 lists, #62 in FY2023 and not on the FY2024 list; returned.
2	Bechtel Parsons Blue Grass, A Joint Venture Top agencies Army (Department of the Army)	$289,456,116	14.3%	Rank history: not on the FY2021–FY2023 lists and #3 in FY2024; up 1 since FY2024.
3	Bechtel Corp Through Bechtel National, Inc. Top agencies Army (Department of the Army)	$237,713,874	11.8%	Rank history: #2 in FY2021, #2 in FY2022, #1 in FY2023 and #2 in FY2024; down 1 since FY2024.
4	Environmental Chemical Corporation Through ECC Constructors LLC Top agencies Army (Department of the Army)	$153,963,776	7.6%	Rank history: not on the FY2021–FY2024 lists; new.
5	Amentum Holdings, Inc. 2 awardees, including Washington River Protection Solutions LLC Top agencies DOE (Department of Energy)	$103,065,269	5.1%	Rank history: not on the FY2021–FY2023 lists and #4 in FY2024; down 1 since FY2024.
6	Inmar, Inc. Through Inmar RX Solutions Inc. Top agencies HHS (Department of Health and Human Services) VA (Department of Veterans Affairs)	$41,251,345	2.0%	Rank history: not on the FY2021–FY2024 lists; new.
7	The Aleut Corporation Through Aleut Environmental Remediation, LLC Top agencies Army (Department of the Army)	$22,408,328	1.1%	Rank history: not on the FY2021–FY2024 lists; new.
8	Guidehouse Inc. Through Aptim Federal Services, LLC Top agencies Navy (Department of the Navy) Army (Department of the Army)	$16,344,395	0.8%	Rank history: not on the FY2021–FY2023 lists and #9 in FY2024; up 1 since FY2024.
9	Seaon Environmental LLC Top agencies Navy (Department of the Navy)	$14,344,566	0.7%	Rank history: #18 in FY2021, #11 in FY2022, #8 in FY2023 and #12 in FY2024; up 3 since FY2024.
10	Energysolutions, LLC 3 awardees, including Energysolutions Services, Inc. Top agencies EPA (Environmental Protection Agency) Navy (Department of the Navy) Army (Department of the Army)	$13,581,704	0.7%	Rank history: not on the FY2021–FY2024 lists; up 157 since FY2024.
11	Clean Harbors Inc. 2 awardees, including Clean Harbors Environmental Services Inc. Top agencies DLA (Defense Logistics Agency) DHS (Department of Homeland Security) USAF (Department of the Air Force)	$13,519,811	0.7%	Rank history: #19 in FY2021, #12 in FY2022, #6 in FY2023 and #8 in FY2024; down 3 since FY2024.
12	Foreign Utility Consolidated Reporting Top agencies Army (Department of the Army)	$11,611,607	0.6%	Rank history: #11 in FY2021, #8 in FY2022, #12 in FY2023 and #16 in FY2024; up 4 since FY2024.
13	Veolia Es Technical Solutions LLC Top agencies Army (Department of the Army) EPA (Environmental Protection Agency) DOJ (Department of Justice)	$10,966,221	0.5%	Rank history: not on the FY2021–FY2023 lists and #31 in FY2024; up 18 since FY2024.
14	C & C Environmental Inc. Top agencies DLA (Defense Logistics Agency) Army (Department of the Army) DOI (Department of the Interior)	$10,703,457	0.5%	Rank history: #16 in FY2021, #13 in FY2022, #13 in FY2023 and #17 in FY2024; up 3 since FY2024.
15	Tradebe Environmental Services, LLC 2 awardees, including Tradebe Treatment and Recycling, LLC Top agencies DLA (Defense Logistics Agency) VA (Department of Veterans Affairs) USDA (Department of Agriculture)	$10,675,822	0.5%	Rank history: not on the FY2021–FY2023 lists and #29 in FY2024; up 14 since FY2024.
16	Environmental Rail Solutions Inc. Top agencies Army (Department of the Army)	$10,605,864	0.5%	Rank history: #57 in FY2021, #5 in FY2022, #4 in FY2023 and #7 in FY2024; down 9 since FY2024.
17	Willow Environmental Inc. Top agencies DLA (Defense Logistics Agency)	$9,876,404	0.5%	Rank history: #20 in FY2021, #26 in FY2022, #19 in FY2023 and #22 in FY2024; up 5 since FY2024.
18	Horizon Environmental Services, Inc. Top agencies DLA (Defense Logistics Agency) DHS (Department of Homeland Security)	$9,172,140	0.5%	Rank history: #35 in FY2021, #38 in FY2022, #20 in FY2023 and #11 in FY2024; down 7 since FY2024.
19	TRI-State Government Services Inc 2 awardees, including International Precision, Inc. Top agencies DLA (Defense Logistics Agency) USAF (Department of the Air Force)	$8,206,273	0.4%	Rank history: #15 in FY2021, #22 in FY2022, #14 in FY2023 and #15 in FY2024; down 4 since FY2024.
20	Sued-Muell GMBH & Co. KG Fuer Abfalltransporte UND Sonderabfallbeseitigung Top agencies DLA (Defense Logistics Agency)	$7,972,792	0.4%	Rank history: #22 in FY2021, #25 in FY2022, #21 in FY2023 and #14 in FY2024; down 6 since FY2024.
21	Industrial Waste Utilization, LLC Top agencies DLA (Defense Logistics Agency)	$7,080,237	0.4%	Rank history: not on the FY2021–FY2024 lists; new.
22	JFL-WCS Partners LLC Through Waste Control Specialists LLC Top agencies DOE (Department of Energy) EPA (Environmental Protection Agency)	$6,635,040	0.3%	Rank history: not on the FY2021–FY2022 lists, #15 in FY2023 and #10 in FY2024; down 12 since FY2024.
23	Black Gold Industries Top agencies DLA (Defense Logistics Agency)	$6,119,631	0.3%	Rank history: #13 in FY2021, #18 in FY2022, #18 in FY2023 and #21 in FY2024; down 2 since FY2024.
24	Republic Services Inc. 14 awardees, including Allied Waste Services of North America, LLC, Republic Services of North Carolina LLC and Advanced Chemical Transport LLC Top agencies Army (Department of the Army) DOJ (Department of Justice) DOI (Department of the Interior)	$6,081,318	0.3%	Rank history: #58 in FY2021, #77 in FY2022, #77 in FY2023 and #18 in FY2024; down 6 since FY2024.
25	Advant-Edge Solutions of Middle Atlantic Inc. Top agencies DHA (Defense Health Agency) HHS (Department of Health and Human Services) Treasury (Department of the Treasury)	$5,629,864	0.3%	Rank history: #70 in FY2021, #23 in FY2022, #22 in FY2023 and #25 in FY2024; unchanged since FY2024.
26	Pacific Commercial Services, Inc. Top agencies DLA (Defense Logistics Agency) DHS (Department of Homeland Security) DOI (Department of the Interior)	$4,155,026	0.2%	Rank history: #41 in FY2021, #44 in FY2022, #43 in FY2023 and #26 in FY2024; unchanged since FY2024.
27	Arcwood Environmental, LLC Top agencies Navy (Department of the Navy) DLA (Defense Logistics Agency) DOJ (Department of Justice)	$3,985,539	0.2%	Rank history: not on the FY2021–FY2023 lists and #39 in FY2024; up 12 since FY2024.
28	Meadows Cmpg, Inc. Top agencies Navy (Department of the Navy) USAF (Department of the Air Force)	$3,685,157	0.2%	Rank history: #52 in FY2021, #41 in FY2022, #52 in FY2023 and #33 in FY2024; up 5 since FY2024.
29	Neie Medical Waste Services, LLC Top agencies VA (Department of Veterans Affairs) USDA (Department of Agriculture)	$3,484,619	0.2%	Rank history: #39 in FY2021, #30 in FY2022, #29 in FY2023 and #44 in FY2024; up 15 since FY2024.
30	Marianas Gas Corp Top agencies DLA (Defense Logistics Agency)	$3,289,152	0.2%	Rank history: not on the FY2021–FY2022 lists, #27 in FY2023 and #28 in FY2024; down 2 since FY2024.
31	Tikigaq Construction, LLC Top agencies Navy (Department of the Navy)	$3,137,067	0.2%	Rank history: not on the FY2021–FY2024 lists; new.
32	Logex System International GMBH Top agencies DLA (Defense Logistics Agency)	$2,396,801	0.1%	Rank history: not on the FY2021–FY2023 lists and #60 in FY2024; up 28 since FY2024.
33	J&T Recycling Corporation Top agencies DLA (Defense Logistics Agency)	$2,335,165	0.1%	Rank history: #26 in FY2021, #29 in FY2022, #32 in FY2023 and #34 in FY2024; up 1 since FY2024.
34	NRC Environmental Services Inc. Top agencies DLA (Defense Logistics Agency)	$2,321,822	0.1%	Rank history: not on the FY2021–FY2023 lists and #55 in FY2024; up 21 since FY2024.
35	Harsco Corporation 2 awardees, including AES Asset Acquisition Corporation Top agencies DLA (Defense Logistics Agency)	$2,079,842	0.1%	Rank history: not on the FY2021–FY2024 lists; up 105 since FY2024.
36	Flightfab, Inc. Top agencies Navy (Department of the Navy)	$2,070,353	0.1%	Rank history: #79 in FY2021, #50 in FY2022, #59 in FY2023 and #30 in FY2024; down 6 since FY2024.
37	Tgha Top agencies DOI (Department of the Interior)	$1,999,295	0.1%	Rank history: not on the FY2021–FY2023 lists and #36 in FY2024; down 1 since FY2024.
38	GS Environmental, Inc. Top agencies DLA (Defense Logistics Agency)	$1,989,594	0.1%	Rank history: #34 in FY2021, #39 in FY2022, #69 in FY2023 and #50 in FY2024; up 12 since FY2024.
39	Earth Smart Environmental Solutions LLC Top agencies VA (Department of Veterans Affairs) USDA (Department of Agriculture)	$1,958,280	0.1%	Rank history: #67 in FY2021, #61 in FY2022, #45 in FY2023 and #35 in FY2024; down 4 since FY2024.
40	Areaka Trading & Logistics Company Top agencies USAF (Department of the Air Force)	$1,834,935	0.1%	Rank history: #29 in FY2021, #32 in FY2022, #39 in FY2023 and #46 in FY2024; up 6 since FY2024.
41	Advance Engineering and Construction L.L.C. Top agencies USAF (Department of the Air Force)	$1,831,294	0.1%	Rank history: not on the FY2021–FY2022 lists, #44 in FY2023 and not on the FY2024 list; returned.
42	Aim Consulting, LLC Top agencies DHS (Department of Homeland Security)	$1,725,609	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
43	Jfe-K Ryukyu Logistic JV Top agencies DLA (Defense Logistics Agency)	$1,687,481	0.1%	Rank history: #45 in FY2021, #16 in FY2022, #16 in FY2023 and #62 in FY2024; up 19 since FY2024.
44	Clean Earth Systems, Inc. Top agencies DLA (Defense Logistics Agency)	$1,641,611	0.1%	Rank history: #51 in FY2021, #46 in FY2022, #42 in FY2023 and #38 in FY2024; down 6 since FY2024.
45	EWA Direction Inc. Top agencies VA (Department of Veterans Affairs)	$1,554,475	0.1%	Rank history: #86 in FY2021, not on the FY2022–FY2023 lists and #70 in FY2024; up 25 since FY2024.
46	Okinawaken Sangyo Haikibutsushori Cooperative Association Top agencies Navy (Department of the Navy)	$1,548,499	0.1%	Rank history: #47 in FY2021, #51 in FY2022, #55 in FY2023 and #52 in FY2024; up 6 since FY2024.
47	Shimada Shokai Co., Ltd Top agencies DLA (Defense Logistics Agency)	$1,468,676	0.1%	Rank history: #48 in FY2021, #63 in FY2022, #63 in FY2023 and #66 in FY2024; up 19 since FY2024.
48	Perma-Fix Environmental Services, Inc. Top agencies Navy (Department of the Navy)	$1,442,189	0.1%	Rank history: #44 in FY2021, #43 in FY2022, #40 in FY2023 and #42 in FY2024; down 6 since FY2024.
49	Kipp Mickels Equipment, Inc. Top agencies DLA (Defense Logistics Agency)	$1,415,570	0.1%	Rank history: #71 in FY2021, #56 in FY2022, #73 in FY2023 and #47 in FY2024; down 2 since FY2024.
50	Triumvirate Environmental, LLC 2 awardees, including West Central Environmental Corp. Top agencies DLA (Defense Logistics Agency) Army (Department of the Army)	$1,403,790	0.1%	Rank history: not on the FY2021–FY2024 lists; up 79 since FY2024.
51	EDM Enterprises, LLC Top agencies VA (Department of Veterans Affairs)	$1,396,027	0.1%	Rank history: #40 in FY2021, #40 in FY2022, #49 in FY2023 and #41 in FY2024; down 10 since FY2024.
52	Relife Recycling S.R.L. Top agencies DLA (Defense Logistics Agency)	$1,331,463	0.1%	Rank history: not on the FY2021–FY2022 lists, #51 in FY2023 and #49 in FY2024; down 3 since FY2024.
53	ECO Environment Co., Ltd. Top agencies Army (Department of the Army)	$1,288,380	0.1%	Rank history: #62 in FY2021, #57 in FY2022, #30 in FY2023 and #51 in FY2024; down 2 since FY2024.
54	Remondis Industrie Service GMBH. 2 awardees, including Refood GMBH & Co. KG Top agencies DLA (Defense Logistics Agency) Army (Department of the Army)	$1,249,513	0.1%	Rank history: not on the FY2021–FY2022 lists, #84 in FY2023 and #59 in FY2024; up 5 since FY2024.
55	Inland Service Corporation, LLC Top agencies Army (Department of the Army)	$1,196,932	0.1%	Rank history: #27 in FY2021, #10 in FY2022, #26 in FY2023 and #24 in FY2024; down 31 since FY2024.
56	Hamilton Alliance Inc. Top agencies DOJ (Department of Justice) VA (Department of Veterans Affairs)	$1,192,573	0.1%	Rank history: not on the FY2021 list, #100 in FY2022, #87 in FY2023 and #92 in FY2024; up 36 since FY2024.
57	ECO Energy Korea Co., Ltd Top agencies DLA (Defense Logistics Agency)	$1,186,628	0.1%	Rank history: not on the FY2021–FY2024 lists; up 85 since FY2024.
58	August Mack Environmental, Inc. Top agencies Army (Department of the Army)	$1,070,961	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
59	Stericycle Inc 2 awardees Top agencies VA (Department of Veterans Affairs) DOJ (Department of Justice) USAF (Department of the Air Force)	$1,065,275	0.1%	Rank history: not on the FY2021–FY2022 lists, #82 in FY2023 and #79 in FY2024; up 20 since FY2024.
60	Specs Chemical Services, LLC Top agencies Army (Department of the Army)	$1,029,000	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
61	TD Environmental Inc. Top agencies DLA (Defense Logistics Agency)	$973,778	<0.1%	Rank history: #50 in FY2021, #73 in FY2022, #70 in FY2023 and #64 in FY2024; up 3 since FY2024.
62	Onaka Gumi Co.,Ltd. Top agencies DLA (Defense Logistics Agency)	$971,499	<0.1%	Rank history: #82 in FY2021, #78 in FY2022, not on the FY2023 list and #75 in FY2024; up 13 since FY2024.
63	American Vet Solutions Inc. Top agencies VA (Department of Veterans Affairs)	$929,331	<0.1%	Rank history: not on the FY2021–FY2024 lists; up 125 since FY2024.
64	Guahan Waste Control, Inc. Top agencies DLA (Defense Logistics Agency)	$921,385	<0.1%	Rank history: #63 in FY2021, #65 in FY2022, #54 in FY2023 and #57 in FY2024; down 7 since FY2024.
65	Lincoln Environmental Services, Inc. Top agencies USAF (Department of the Air Force)	$921,227	<0.1%	Rank history: #80 in FY2021, #74 in FY2022, not on the FY2023 list and #71 in FY2024; up 6 since FY2024.
66	Tatonka Trucking Llc. Top agencies IBWC (International Boundary and Water Commission U.S.-Mexico)	$898,800	<0.1%	Rank history: not on the FY2021–FY2024 lists; new.
67	Chenega-Salas O'brien JV, LLC Top agencies Army (Department of the Army)	$865,252	<0.1%	Rank history: not on the FY2021–FY2024 lists; up 96 since FY2024.
68	Kankyo Solution Co.,Ltd Top agencies Navy (Department of the Navy)	$863,083	<0.1%	Rank history: not on the FY2021–FY2024 lists; new.
69	Nambu Service Co., Ltd. Top agencies Army (Department of the Army)	$834,504	<0.1%	Rank history: not on the FY2021 list, #99 in FY2022, #68 in FY2023 and #94 in FY2024; up 25 since FY2024.
70	Entsorgungsbetrieb Luzia Francois GMBH Top agencies USAF (Department of the Air Force)	$794,387	<0.1%	Rank history: #43 in FY2021, #45 in FY2022, #41 in FY2023 and #53 in FY2024; down 17 since FY2024.
71	Applied Technology, Inc. Top agencies Army (Department of the Army) Navy (Department of the Navy)	$787,299	<0.1%	Rank history: not on the FY2021 list, #72 in FY2022, #24 in FY2023 and #54 in FY2024; down 17 since FY2024.
72	Best Choice Environmental Inc. Top agencies VA (Department of Veterans Affairs)	$785,704	<0.1%	Rank history: not on the FY2021–FY2022 lists, #91 in FY2023 and #61 in FY2024; down 11 since FY2024.
73	Broadview Waste Solutions, Inc. Top agencies VA (Department of Veterans Affairs) HHS (Department of Health and Human Services)	$780,716	<0.1%	Rank history: not on the FY2021–FY2022 lists, #57 in FY2023 and #78 in FY2024; up 5 since FY2024.
74	Reworld Holding Corporation 4 awardees, including Reworld Solutions, LLC, Reworld Tulsa, LLC and Reworld Alexandria / Arlington, LLC Top agencies DOJ (Department of Justice) HHS (Department of Health and Human Services) DHS (Department of Homeland Security)	$757,953	<0.1%	Rank history: not on the FY2021–FY2022 lists, #80 in FY2023 and #86 in FY2024; up 12 since FY2024.
75	Pacific Coast Contracting Group Top agencies VA (Department of Veterans Affairs)	$750,000	<0.1%	Rank history: not on the FY2021–FY2024 lists; new.
76	Auxilio Management Services Top agencies DOI (Department of the Interior)	$742,160	<0.1%	Rank history: not on the FY2021 list, #70 in FY2022, #71 in FY2023 and #77 in FY2024; up 1 since FY2024.
77	Air Pollution Control Products Inc. Top agencies DOD (Department of Defense)	$685,192	<0.1%	Rank history: #88 in FY2021, #92 in FY2022, #61 in FY2023 and #82 in FY2024; up 5 since FY2024.
78	Veolia ES (UK) Limited Top agencies DLA (Defense Logistics Agency)	$681,924	<0.1%	Rank history: not on the FY2021–FY2024 lists; up 25 since FY2024.
79	Lormar Reclamation Service, LLC Top agencies USAF (Department of the Air Force)	$660,000	<0.1%	Rank history: #90 in FY2021, #89 in FY2022, not on the FY2023 list and #80 in FY2024; up 1 since FY2024.
80	Cinka Construction & Consulting Services LLC Top agencies DHS (Department of Homeland Security)	$626,706	<0.1%	Rank history: not on the FY2021 list, #85 in FY2022, #79 in FY2023 and #84 in FY2024; up 4 since FY2024.
81	Perikin Enterprises LLC Top agencies Army (Department of the Army)	$621,855	<0.1%	Rank history: not on the FY2021–FY2022 lists, #78 in FY2023 and #83 in FY2024; up 2 since FY2024.
82	Advetage Solutions LLC Top agencies Army (Department of the Army)	$589,565	<0.1%	Rank history: not on the FY2021–FY2024 lists; up 188 since FY2024.
83	Kodiak Island Borough Top agencies DHS (Department of Homeland Security)	$574,232	<0.1%	Rank history: not on the FY2021–FY2024 lists; up 44 since FY2024.
84	Remondis GMBH Top agencies Army (Department of the Army)	$573,388	<0.1%	Rank history: not on the FY2021–FY2024 lists; new.
85	North State Environmental Top agencies VA (Department of Veterans Affairs)	$550,385	<0.1%	Rank history: not on the FY2021–FY2024 lists; new.
86	Waste Management, Inc. 2 awardees, including Waste Management of Texas, Inc. Top agencies Army (Department of the Army) DOJ (Department of Justice)	$534,804	<0.1%	Rank history: #94 in FY2021, not on the FY2022 list, #100 in FY2023 and #69 in FY2024; down 17 since FY2024.
87	Tad Environment Top agencies DLA (Defense Logistics Agency)	$530,870	<0.1%	Rank history: #65 in FY2021, #58 in FY2022, #58 in FY2023 and #58 in FY2024; down 29 since FY2024.
88	Krätz GMBH Top agencies Army (Department of the Army)	$498,009	<0.1%	Rank history: #53 in FY2021, #35 in FY2022, #37 in FY2023 and #32 in FY2024; down 56 since FY2024.
89	Iron Enterprise LLC Top agencies VA (Department of Veterans Affairs) DOJ (Department of Justice) Army (Department of the Army)	$489,199	<0.1%	Rank history: not on the FY2021–FY2024 lists; up 175 since FY2024.
90	Horizon Environmental Solutions Corporation Top agencies DLA (Defense Logistics Agency)	$482,268	<0.1%	Rank history: #97 in FY2021, #91 in FY2022, #36 in FY2023 and #74 in FY2024; down 16 since FY2024.
91	C2G, Ltd Co. Top agencies DLA (Defense Logistics Agency)	$470,682	<0.1%	Rank history: not on the FY2021 list, #81 in FY2022 and not on the FY2023–FY2024 lists; up 41 since FY2024.
92	Up-Side Management Co Top agencies Army (Department of the Army)	$466,439	<0.1%	Rank history: not on the FY2021–FY2023 lists and #76 in FY2024; down 16 since FY2024.
93	Daniels Sharpsmart, Inc. Top agencies VA (Department of Veterans Affairs)	$449,340	<0.1%	Rank history: not on the FY2021–FY2024 lists; new.
94	Action Services Corporation Top agencies Army (Department of the Army)	$447,794	<0.1%	Rank history: not on the FY2021–FY2022 lists, #96 in FY2023 and #96 in FY2024; up 2 since FY2024.
95	Koman Government Solutions LLC Top agencies Navy (Department of the Navy)	$441,364	<0.1%	Rank history: not on the FY2021–FY2024 lists; up 6 since FY2024.
96	Cherokee Nation Through Cherokee Nation Environmental Solutions, L.L.C. Top agencies DLA (Defense Logistics Agency)	$428,581	<0.1%	Rank history: not on the FY2021–FY2024 lists; new.
97	G.d.o., Inc. Top agencies Army (Department of the Army)	$415,100	<0.1%	Rank history: not on the FY2021–FY2024 lists; new.
98	Whitewater Environmental LLC Top agencies USAF (Department of the Air Force)	$407,102	<0.1%	Rank history: not on the FY2021–FY2024 lists; up 43 since FY2024.
99	Verina Consulting Group LLC Top agencies USAF (Department of the Air Force)	$406,205	<0.1%	Rank history: not on the FY2021–FY2024 lists; up 14 since FY2024.
100	Narcx Solutions Inc. Top agencies DHS (Department of Homeland Security)	$399,997	<0.1%	Rank history: not on the FY2021–FY2024 lists; new.

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100 of 450 contractors listed here. See the rest on GovTribe.

Rankings for the codes under NAICS 5622

Code	Net obligations	Largest contractor
56221 Waste Treatment and Disposal	$1,938,311,939	Hanford Tank Waste Operations & Closure, 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 $2.02 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. An awardee whose own actions mostly name no parent, and that no other company's actions name as their parent, rolls up its SAM.gov registration's chain of parent companies: it counts under the first company there that other companies' actions name as their parent, or under the parent most of a company's own actions name, whichever comes first; with neither, under the highest company in the chain with federal contracts of its own. Joint ventures stay companies of their own. 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 NAICS 5622 contractors in FY2025?

1. Hanford Tank Waste Operations & Closure, LLC ($796M), 2. Bechtel Parsons Blue Grass, A Joint Venture ($289M), 3. Bechtel Corp ($238M), 4. Environmental Chemical Corporation ($154M), 5. Amentum Holdings, Inc. ($103M), 6. Inmar, Inc. ($41.3M), 7. The Aleut Corporation ($22.4M), 8. Guidehouse Inc. ($16.3M), 9. Seaon Environmental LLC ($14.3M), 10. Energysolutions, LLC ($13.6M).

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