Top 100 Contractors in NAICS 562211: Hazardous Waste Treatment and Disposal, FY2021

Name: Top 100 Contractors in NAICS 562211: Hazardous Waste Treatment and Disposal, FY2021
Creator: GovTribe

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

The top 10 won 90% of FY2021 NAICS 562211 contract dollars

Contract obligations: $2,357,276,396 Net of deobligations, by contracts coded NAICS 562211
Contractors: 276 Parent companies with an obligation
Largest contractor: Amentum Services, Inc. $1.11 billion, 45.6% 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	Amentum Services, Inc. 2 awardees, including Savannah River Remediation LLC and Washington River Protection Solutions LLC Top agencies DOE (Department of Energy)	$1,108,780,965	45.6%	Rank history: #1 in FY2022, #2 in FY2023, #1 in FY2024 and not on the FY2025 list; up 13 since FY2020.
2	Bechtel Corp 2 awardees, including Bechtel Parsons Blue Grass, A Joint Venture and Bechtel National, Inc. Top agencies Army (Department of the Army)	$655,463,231	26.9%	Rank history: #2 in FY2022, #1 in FY2023, #2 in FY2024 and #3 in FY2025; up 1 since FY2020.
3	Washington River Protection Solutions LLC Top agencies DOE (Department of Energy)	$194,600,000	8.0%	Rank history: not on the FY2022–FY2025 lists; down 2 since FY2020.
4	AECOM Through Washington River Protection Solutions LLC Top agencies DOE (Department of Energy)	$81,999,999	3.4%	Rank history: not on the FY2022–FY2025 lists; unchanged since FY2020.
5	Bechtel National, Inc. Top agencies Army (Department of the Army)	$63,000,000	2.6%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
6	Cook Inlet Region Inc. Through OSC Technical Solutions, LLC Top agencies DOE (Department of Energy)	$41,511,464	1.7%	Rank history: not on the FY2022–FY2025 lists; unchanged since FY2020.
7	US Ecology, Inc. 6 awardees, including US Ecology Idaho, Inc., US Ecology Holdings, Inc. and US Ecology Washington Inc. Top agencies Army (Department of the Army) DOE (Department of Energy) DOI (Department of the Interior)	$14,657,233	0.6%	Rank history: #4 in FY2022, #7 in FY2023, #12 in FY2024 and not on the FY2025 list; up 2 since FY2020.
8	Waste Control Specialists LLC Top agencies DOE (Department of Energy) Army (Department of the Army) EPA (Environmental Protection Agency)	$11,911,013	0.5%	Rank history: #8 in FY2022, #11 in FY2023 and not on the FY2024–FY2025 lists; up 26 since FY2020.
9	Energysolutions LLC 2 awardees, including Energysolutions Services, Inc. Top agencies Navy (Department of the Navy) DOE (Department of Energy)	$9,390,499	0.4%	Rank history: #6 in FY2022, #8 in FY2023, #32 in FY2024 and not on the FY2025 list; down 1 since FY2020.
10	Noreas Environmental Services LLC Top agencies Navy (Department of the Navy)	$8,922,371	0.4%	Rank history: #29 in FY2022 and not on the FY2023–FY2025 lists; unchanged since FY2020.
11	Black Gold Industries Top agencies DLA (Defense Logistics Agency) USAF (Department of the Air Force)	$8,317,749	0.3%	Rank history: #14 in FY2022, #17 in FY2023, #20 in FY2024 and #22 in FY2025; up 1 since FY2020.
12	Industrial Waste Utilization, LLC Top agencies DLA (Defense Logistics Agency)	$7,263,721	0.3%	Rank history: #13 in FY2022, #16 in FY2023, #18 in FY2024 and #20 in FY2025; up 5 since FY2020.
13	Tri-State Government Services Inc. Top agencies DLA (Defense Logistics Agency)	$7,242,820	0.3%	Rank history: #19 in FY2022, #13 in FY2023, #15 in FY2024 and #17 in FY2025; down 2 since FY2020.
14	Tradebe Treatment and Recycling LLC 3 awardees Top agencies DLA (Defense Logistics Agency) VA (Department of Veterans Affairs) EPA (Environmental Protection Agency)	$7,222,517	0.3%	Rank history: #16 in FY2022, #9 in FY2023, #22 in FY2024 and #30 in FY2025; up 81 since FY2020.
15	C & C Environmental Inc. Top agencies DLA (Defense Logistics Agency) Army (Department of the Army) DOI (Department of the Interior)	$7,151,852	0.3%	Rank history: #10 in FY2022, #12 in FY2023, #16 in FY2024 and #12 in FY2025; up 1 since FY2020.
16	Seaon Environmental LLC Top agencies Navy (Department of the Navy)	$6,242,500	0.3%	Rank history: #9 in FY2022, #10 in FY2023, #14 in FY2024 and #10 in FY2025; up 39 since FY2020.
17	Willow Environmental Inc. Top agencies DLA (Defense Logistics Agency)	$5,130,691	0.2%	Rank history: #23 in FY2022, #18 in FY2023, #21 in FY2024 and #14 in FY2025; down 2 since FY2020.
18	Ecosystech JV LLC Top agencies DLA (Defense Logistics Agency)	$5,096,402	0.2%	Rank history: #25 in FY2022, #38 in FY2023 and not on the FY2024–FY2025 lists; up 5 since FY2020.
19	Sued-Muell GMBH & Co. KG Fuer Abfalltransporte UND Sonderabfallbeseitigung Top agencies DLA (Defense Logistics Agency) USAF (Department of the Air Force)	$5,060,117	0.2%	Rank history: #22 in FY2022, #20 in FY2023, #13 in FY2024 and #18 in FY2025; up 6 since FY2020.
20	Clean Harbors Inc 4 awardees, including Clean Harbors Environmental Services Inc., Safety-Kleen Systems, Inc. and Clean Harbors Caribe, Inc. Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy) VA (Department of Veterans Affairs)	$5,007,948	0.2%	Rank history: #11 in FY2022, #6 in FY2023, #8 in FY2024 and #9 in FY2025; up 4 since FY2020.
21	Inmar Clearing Inc. Through Inmar RX Solutions Inc. Top agencies HHS (Department of Health and Human Services)	$4,523,084	0.2%	Rank history: #3 in FY2022, #3 in FY2023, #6 in FY2024 and not on the FY2025 list; up 1 since FY2020.
22	Salas O'brien Federal, LLC Top agencies Army (Department of the Army)	$4,499,656	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
23	Southwest Research Institute Top agencies NRC (Nuclear Regulatory Commission)	$4,215,676	0.2%	Rank history: #24 in FY2022, #39 in FY2023 and not on the FY2024–FY2025 lists; down 5 since FY2020.
24	J&T Recycling Corporation Top agencies DLA (Defense Logistics Agency)	$4,105,585	0.2%	Rank history: #26 in FY2022, #28 in FY2023, #29 in FY2024 and #31 in FY2025; up 2 since FY2020.
25	Heritage Environmental Services Inc. Through Arcwood Environmental, LLC Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy) VA (Department of Veterans Affairs)	$3,928,415	0.2%	Rank history: #17 in FY2022, #29 in FY2023, #34 in FY2024 and not on the FY2025 list; down 5 since FY2020.
26	Lonza Group AG Through Arch Chemicals, Inc. Top agencies DLA (Defense Logistics Agency)	$3,369,257	0.1%	Rank history: not on the FY2022–FY2025 lists; up 39 since FY2020.
27	Veolia Water North America-West LLC 3 awardees, including Veolia Es Technical Solutions LLC, Veolia Es (Uk) Limited and VNS Federal Services LLC Top agencies Army (Department of the Army) DLA (Defense Logistics Agency) DOJ (Department of Justice)	$3,284,911	0.1%	Rank history: #32 in FY2022, #27 in FY2023, #56 in FY2024 and not on the FY2025 list; up 3 since FY2020.
28	San-I-Pak Pacific, Inc. Top agencies VA (Department of Veterans Affairs)	$3,179,465	0.1%	Rank history: #18 in FY2022, #22 in FY2023 and not on the FY2024–FY2025 lists; up 39 since FY2020.
29	GS Environmental, Inc. Top agencies DLA (Defense Logistics Agency)	$2,927,317	0.1%	Rank history: #33 in FY2022, #54 in FY2023, #43 in FY2024 and #35 in FY2025; up 8 since FY2020.
30	Kanto Kosan Co. Ltd. Top agencies Navy (Department of the Navy)	$2,792,172	0.1%	Rank history: not on the FY2022–FY2025 lists; up 10 since FY2020.
31	Horizon Environmental Services, Inc. Top agencies DLA (Defense Logistics Agency) DOJ (Department of Justice)	$2,536,360	0.1%	Rank history: #31 in FY2022, #19 in FY2023, #11 in FY2024 and #16 in FY2025; down 4 since FY2020.
32	AES Asset Acquisition Corporation Top agencies DLA (Defense Logistics Agency)	$2,447,608	0.1%	Rank history: #30 in FY2022, #30 in FY2023, #38 in FY2024 and not on the FY2025 list; down 4 since FY2020.
33	Aptim Federal Services LLC Top agencies Army (Department of the Army)	$2,303,834	0.1%	Rank history: #7 in FY2022, #5 in FY2023, #76 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
34	Neie Medical Waste Services, LLC Top agencies VA (Department of Veterans Affairs) USAF (Department of the Air Force)	$2,171,078	0.1%	Rank history: #27 in FY2022, #26 in FY2023, #39 in FY2024 and #28 in FY2025; down 5 since FY2020.
35	EDM Enterprises, LLC Top agencies VA (Department of Veterans Affairs)	$2,140,244	0.1%	Rank history: #34 in FY2022, #41 in FY2023, #36 in FY2024 and #44 in FY2025; down 2 since FY2020.
36	Pacific Commercial Services, Inc. Top agencies DLA (Defense Logistics Agency) DOI (Department of the Interior) Army (Department of the Army)	$1,928,354	0.1%	Rank history: #39 in FY2022, #37 in FY2023, #24 in FY2024 and #25 in FY2025; up 3 since FY2020.
37	Graham & Associates Inc. Top agencies USAF (Department of the Air Force)	$1,732,488	0.1%	Rank history: #45 in FY2022, #46 in FY2023 and not on the FY2024–FY2025 lists; up 10 since FY2020.
38	Entsorgungsbetrieb Luzia Francois GMBH Top agencies USAF (Department of the Air Force)	$1,708,253	0.1%	Rank history: #37 in FY2022, #33 in FY2023, #45 in FY2024 and #58 in FY2025; up 3 since FY2020.
39	Perma-Fix Environmental Services, Inc. Top agencies Navy (Department of the Navy) DOE (Department of Energy)	$1,679,430	0.1%	Rank history: #36 in FY2022, #32 in FY2023, #37 in FY2024 and #43 in FY2025; down 4 since FY2020.
40	Jfe-K Ryukyu Logistic JV Top agencies DLA (Defense Logistics Agency)	$1,658,124	0.1%	Rank history: #46 in FY2022, #15 in FY2023, #52 in FY2024 and #39 in FY2025; down 2 since FY2020.
41	K.i. Kogyo Ltd. Top agencies Navy (Department of the Navy) DLA (Defense Logistics Agency)	$1,629,883	0.1%	Rank history: #28 in FY2022, #67 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
42	Okinawaken Sangyo Haikibutsushori Cooperative Association Top agencies Navy (Department of the Navy)	$1,622,083	0.1%	Rank history: #43 in FY2022, #45 in FY2023, #44 in FY2024 and #42 in FY2025; down 11 since FY2020.
43	ISA (Wyoming) Corp Top agencies Navy (Department of the Navy)	$1,581,572	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
44	TD Environmental Inc. Top agencies DLA (Defense Logistics Agency)	$1,561,705	0.1%	Rank history: #58 in FY2022, #55 in FY2023, #54 in FY2024 and #52 in FY2025; down 8 since FY2020.
45	Clean Earth Systems, Inc. Top agencies DLA (Defense Logistics Agency)	$1,515,206	0.1%	Rank history: #38 in FY2022, #34 in FY2023, #33 in FY2024 and #40 in FY2025; new, not ranked in FY2020.
46	Tet Consulting & Business Management Services, LLC Top agencies DHS (Department of Homeland Security)	$1,473,472	0.1%	Rank history: #41 in FY2022, #40 in FY2023, #40 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
47	Ecolfer SRL Top agencies DLA (Defense Logistics Agency)	$1,439,513	0.1%	Rank history: #40 in FY2022, #61 in FY2023 and not on the FY2024–FY2025 lists; up 9 since FY2020.
48	Boom Waste Treatment Company Top agencies USAF (Department of the Air Force) Army (Department of the Army)	$1,419,517	0.1%	Rank history: #73 in FY2022 and not on the FY2023–FY2025 lists; up 29 since FY2020.
49	Draeger Inc. 2 awardees Top agencies DLA (Defense Logistics Agency)	$1,405,838	0.1%	Rank history: not on the FY2022–FY2025 lists; up 17 since FY2020.
50	Environmental Rail Solutions Inc. Top agencies Army (Department of the Army)	$1,356,162	0.1%	Rank history: #5 in FY2022, #4 in FY2023, #7 in FY2024 and #13 in FY2025; down 37 since FY2020.
51	Johnsondanforth, Inc. Top agencies VA (Department of Veterans Affairs)	$1,276,605	0.1%	Rank history: #35 in FY2022, #44 in FY2023, #48 in FY2024 and #83 in FY2025; unchanged since FY2020.
52	Tad Environment Top agencies DLA (Defense Logistics Agency)	$1,106,859	<0.1%	Rank history: #47 in FY2022, #48 in FY2023, #49 in FY2024 and #67 in FY2025; down 7 since FY2020.
53	West Central Environmental Corp. Top agencies DLA (Defense Logistics Agency)	$1,092,518	<0.1%	Rank history: #48 in FY2022, #49 in FY2023, #41 in FY2024 and #46 in FY2025; down 7 since FY2020.
54	Earth Smart Environmental Solutions LLC Top agencies VA (Department of Veterans Affairs)	$1,056,605	<0.1%	Rank history: #50 in FY2022, #36 in FY2023, #30 in FY2024 and #36 in FY2025; up 8 since FY2020.
55	Kankyo Solution Co. Ltd. Top agencies Navy (Department of the Navy) Army (Department of the Army)	$1,047,634	<0.1%	Rank history: #61 in FY2022, #60 in FY2023, #60 in FY2024 and not on the FY2025 list; up 28 since FY2020.
56	Advant-Edge Solutions of Middle Atlantic Inc. Top agencies HHS (Department of Health and Human Services) Navy (Department of the Navy) VA (Department of Veterans Affairs)	$1,030,894	<0.1%	Rank history: #20 in FY2022, #21 in FY2023, #23 in FY2024 and #24 in FY2025; down 24 since FY2020.
57	Willkom, Inc. Top agencies DLA (Defense Logistics Agency)	$963,075	<0.1%	Rank history: #53 in FY2022, #58 in FY2023, #67 in FY2024 and not on the FY2025 list; up 6 since FY2020.
58	Enviroserve Inc. Top agencies DLA (Defense Logistics Agency) DHS (Department of Homeland Security)	$935,904	<0.1%	Rank history: #62 in FY2022 and not on the FY2023–FY2025 lists; up 184 since FY2020.
59	Kimin Eng Co., Ltd. Top agencies DLA (Defense Logistics Agency)	$888,451	<0.1%	Rank history: #51 in FY2022, #42 in FY2023, #53 in FY2024 and not on the FY2025 list; down 9 since FY2020.
60	Stericycle Inc. 2 awardees Top agencies VA (Department of Veterans Affairs) Navy (Department of the Navy) HHS (Department of Health and Human Services)	$853,855	<0.1%	Rank history: #52 in FY2022 and not on the FY2023–FY2025 lists; down 3 since FY2020.
61	B & N Resources, LLC Top agencies DLA (Defense Logistics Agency)	$822,000	<0.1%	Rank history: not on the FY2022–FY2025 lists; down 7 since FY2020.
62	Lincoln Environmental Services, Inc. Top agencies USAF (Department of the Air Force)	$770,032	<0.1%	Rank history: #59 in FY2022, not on the FY2023 list, #58 in FY2024 and #55 in FY2025; down 4 since FY2020.
63	Rethmann AG & Co. KG Through Remondis Industrie Service Gmbh. Top agencies DLA (Defense Logistics Agency)	$749,076	<0.1%	Rank history: #63 in FY2022, #71 in FY2023 and not on the FY2024–FY2025 lists; up 10 since FY2020.
64	Arch Chemicals, Inc. Top agencies DLA (Defense Logistics Agency)	$726,215	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 21 since FY2020.
65	Onaka Gumi Co.,Ltd. Top agencies DLA (Defense Logistics Agency)	$701,647	<0.1%	Rank history: #60 in FY2022, #72 in FY2023, #62 in FY2024 and #53 in FY2025; up 7 since FY2020.
66	Hidden Water Inc. Top agencies DLA (Defense Logistics Agency)	$683,007	<0.1%	Rank history: #49 in FY2022, #100 in FY2023 and not on the FY2024–FY2025 lists; down 23 since FY2020.
67	EWA Direction Inc. Top agencies VA (Department of Veterans Affairs)	$661,873	<0.1%	Rank history: not on the FY2022 list, #99 in FY2023, #57 in FY2024 and #41 in FY2025; up 3 since FY2020.
68	Yamaki Co., Ltd. Top agencies DHA (Defense Health Agency) USAF (Department of the Air Force) DLA (Defense Logistics Agency)	$617,835	<0.1%	Rank history: #64 in FY2022, #62 in FY2023, #74 in FY2024 and not on the FY2025 list; unchanged since FY2020.
69	BWX Technologies, Inc. Through Bwxt Nog Technologies, Inc. Top agencies DOE (Department of Energy)	$464,505	<0.1%	Rank history: #68 in FY2022, #64 in FY2023, #69 in FY2024 and #85 in FY2025; new, not ranked in FY2020.
70	Horizon Environmental Solutions Corporation Top agencies DLA (Defense Logistics Agency)	$455,587	<0.1%	Rank history: #67 in FY2022, #31 in FY2023, #61 in FY2024 and #69 in FY2025; up 1 since FY2020.
71	Ncns Environmental, Inc. Top agencies VA (Department of Veterans Affairs) DHA (Defense Health Agency)	$437,416	<0.1%	Rank history: #80 in FY2022, #74 in FY2023, #70 in FY2024 and #91 in FY2025; up 7 since FY2020.
72	Pacific Trans Environmental Services Inc. 2 awardees Top agencies DLA (Defense Logistics Agency)	$422,674	<0.1%	Rank history: #65 in FY2022 and not on the FY2023–FY2025 lists; up 8 since FY2020.
73	Confluence Corp Top agencies Navy (Department of the Navy)	$397,860	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
74	The HP Group LLC Top agencies Navy (Department of the Navy)	$364,971	<0.1%	Rank history: not on the FY2022–FY2025 lists; down 15 since FY2020.
75	Sal Construction Co. Top agencies HHS (Department of Health and Human Services)	$361,440	<0.1%	Rank history: #70 in FY2022, #69 in FY2023, #72 in FY2024 and not on the FY2025 list; up 6 since FY2020.
76	Republic Services Inc. 3 awardees, including Republic Silver State Disposal Inc., Allied Waste Transportation Inc. and Republic Services of Pennsylvania, LLC Top agencies VA (Department of Veterans Affairs) DOE (Department of Energy) DLA (Defense Logistics Agency)	$316,734	<0.1%	Rank history: not on the FY2022 list, #83 in FY2023, #17 in FY2024 and #23 in FY2025; up 125 since FY2020.
77	Set Environmental Inc. Top agencies DOT (Department of Transportation) DOJ (Department of Justice)	$316,187	<0.1%	Rank history: #96 in FY2022, #84 in FY2023 and not on the FY2024–FY2025 lists; up 29 since FY2020.
78	Biomedical Waste Services, Inc. Top agencies VA (Department of Veterans Affairs)	$315,311	<0.1%	Rank history: #75 in FY2022, #87 in FY2023 and not on the FY2024–FY2025 lists; up 6 since FY2020.
79	Noble Supply & Logistics, LLC Top agencies Navy (Department of the Navy) USAF (Department of the Air Force)	$312,669	<0.1%	Rank history: #81 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
80	Verina Consulting Group LLC Top agencies USAF (Department of the Air Force)	$309,138	<0.1%	Rank history: #76 in FY2022, #82 in FY2023, #82 in FY2024 and #75 in FY2025; new, not ranked in FY2020.
81	VSE Corporation Top agencies DOJ (Department of Justice)	$300,592	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
82	Up-Side Management Co Top agencies Army (Department of the Army)	$298,758	<0.1%	Rank history: #79 in FY2022, #73 in FY2023, #63 in FY2024 and #70 in FY2025; new, not ranked in FY2020.
83	Auxilio Management Services Top agencies DOI (Department of the Interior)	$288,344	<0.1%	Rank history: #55 in FY2022, #56 in FY2023, #64 in FY2024 and #63 in FY2025; down 22 since FY2020.
84	Jfe-K Iwakuni HW JV Top agencies DLA (Defense Logistics Agency)	$285,898	<0.1%	Rank history: #83 in FY2022, #76 in FY2023 and not on the FY2024–FY2025 lists; up 16 since FY2020.
85	The Kippur Corp Top agencies DHS (Department of Homeland Security)	$280,000	<0.1%	Rank history: #89 in FY2022 and not on the FY2023–FY2025 lists; up 12 since FY2020.
86	Plexus Scientific Corporation Top agencies Commerce (Department of Commerce)	$265,494	<0.1%	Rank history: #92 in FY2022, #52 in FY2023, #77 in FY2024 and not on the FY2025 list; up 136 since FY2020.
87	Cherokee Nation Environmental Solutions, L.L.C. Top agencies DLA (Defense Logistics Agency)	$260,212	<0.1%	Rank history: #82 in FY2022, #78 in FY2023, #73 in FY2024 and #72 in FY2025; up 20 since FY2020.
88	Environmental Management Services Inc. Top agencies EPA (Environmental Protection Agency) VA (Department of Veterans Affairs)	$233,581	<0.1%	Rank history: not on the FY2022–FY2024 lists and #90 in FY2025; up 1 since FY2020.
89	Hawaii 5-0 Technology Services Inc. Top agencies DHS (Department of Homeland Security)	$230,630	<0.1%	Rank history: #77 in FY2022 and not on the FY2023–FY2025 lists; down 7 since FY2020.
90	R. & R. Environmental, Inc. Top agencies Army (Department of the Army)	$226,286	<0.1%	Rank history: not on the FY2022–FY2025 lists; down 4 since FY2020.
91	Ahtna, Incorporated Through Ahtna Design-Build Inc. Top agencies DOE (Department of Energy)	$224,525	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 130 since FY2020.
92	INCINER8 Ltd Top agencies HHS (Department of Health and Human Services)	$220,540	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
93	Environmental Restoration LLC Top agencies DOJ (Department of Justice)	$215,609	<0.1%	Rank history: #91 in FY2022 and not on the FY2023–FY2025 lists; up 138 since FY2020.
94	Elastec Inc. Top agencies Navy (Department of the Navy)	$203,542	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
95	Source Environmental Inc. Top agencies DOI (Department of the Interior) USDA (Department of Agriculture) DOJ (Department of Justice)	$200,188	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
96	Hamilton Alliance Inc. Top agencies VA (Department of Veterans Affairs)	$195,575	<0.1%	Rank history: #85 in FY2022, #68 in FY2023, #80 in FY2024 and #79 in FY2025; down 4 since FY2020.
97	Yahata Marine, K.K. Top agencies Navy (Department of the Navy)	$192,936	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
98	Rad Solutions LLC Top agencies Army (Department of the Army)	$191,302	<0.1%	Rank history: #88 in FY2022, not on the FY2023 list, #68 in FY2024 and not on the FY2025 list; up 4 since FY2020.
99	Argonaut Inflatable Research and Engineering, Inc. Top agencies DLA (Defense Logistics Agency)	$191,252	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
100	Triumvirate Environmental, LLC Top agencies Army (Department of the Army) DHS (Department of Homeland Security)	$190,843	<0.1%	Rank history: #98 in FY2022, not on the FY2023 list, #88 in FY2024 and #100 in FY2025; down 7 since FY2020.

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100 of 276 contractors listed here. See the rest on GovTribe.

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 $2.43 billion obligated before deobligations, so they never pass 100%.
Parent companies: each action counts under the ultimate parent its award record names, or under the awardee when it names none, so no dollar counts twice. Parents of the same name (Inc., LLC and the like aside) count as one company, since FPDS records a company's parent under more than one UEI over time. GovTribe corrects a few parents and names by hand; see the corrections.
Fiscal year 2021 ran Oct 1, 2020 – Sep 30, 2021. The Department of Defense reports its contract actions to FPDS about 90 days late, so a fiscal year is ranked once they're in, in February, and the list doesn't change after.
Rank changes compare with FY2020. "New" marks a company outside that period's top 500, and "Returned" one of those that was on an earlier fiscal year's list.
Rank lines show each company's rank on every fiscal year's list since FY2021, #1 at the top, on a scale that gives the top of the list more room. A dashed stretch spans years it wasn't on the list. The step from FY2020 takes the color of the rank change beside it.
Placeholder recipients FPDS uses when it names no company ("Miscellaneous Foreign Contractors" and the like) aren't ranked.

Quick answers

Who were the top 10 NAICS 562211 contractors in FY2021?

1. Amentum Services, Inc. ($1.11B), 2. Bechtel Corp ($655M), 3. Washington River Protection Solutions LLC ($195M), 4. AECOM ($82M), 5. Bechtel National, Inc. ($63M), 6. Cook Inlet Region Inc. ($41.5M), 7. US Ecology, Inc. ($14.7M), 8. Waste Control Specialists LLC ($11.9M), 9. Energysolutions LLC ($9.39M), 10. Noreas Environmental Services LLC ($8.92M).

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