Top 100 Contractors in NAICS 5622: Waste Treatment and Disposal, FY2024

Name: Top 100 Contractors in NAICS 5622: Waste Treatment and Disposal, FY2024
Creator: GovTribe

Parent companies by net contract obligations Oct 1, 2023 – Sep 30, 2024 Code page on GovTribe

The top 10 won 86% of FY2024 NAICS 5622 contract dollars

Contract obligations: $2,060,643,790 Net of deobligations, by contracts coded NAICS 5622 or a code under it
Contractors: 516 Parent companies with an obligation
Largest contractor: Amentum Services, Inc. $639 million, 30.1% 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	Amentum Services, Inc. 2 awardees, including Washington River Protection Solutions LLC Top agencies DOE (Department of Energy)	$638,754,936	30.1%	Rank history: #1 in FY2021, #1 in FY2022, #2 in FY2023 and not on the FY2025 list; up 1 since FY2023.
2	Bechtel Corp 3 awardees, including Bechtel National, Inc. and Bechtel Parsons Blue Grass, A Joint Venture Top agencies Army (Department of the Army)	$545,815,024	25.8%	Rank history: #2 in FY2021, #2 in FY2022, #1 in FY2023 and #3 in FY2025; down 1 since FY2023.
3	Bechtel Parsons Blue Grass, A Joint Venture Top agencies Army (Department of the Army)	$354,876,038	16.7%	Rank history: not on the FY2021–FY2023 lists and #2 in FY2025; new.
4	Amentum Holdings, Inc. 2 awardees, including Washington River Protection Solutions LLC Top agencies DOE (Department of Energy)	$136,304,668	6.4%	Rank history: not on the FY2021–FY2023 lists and #5 in FY2025; new.
5	ECC Constructors LLC Top agencies Army (Department of the Army)	$47,726,648	2.3%	Rank history: not on the FY2021–FY2023 lists and #4 in FY2025; new.
6	Inmar Clearing Inc. Through Inmar RX Solutions Inc. Top agencies HHS (Department of Health and Human Services)	$30,027,808	1.4%	Rank history: #23 in FY2021, #3 in FY2022, #3 in FY2023 and not on the FY2025 list; down 3 since FY2023.
7	Environmental Rail Solutions Inc. Top agencies Army (Department of the Army)	$16,244,600	0.8%	Rank history: #57 in FY2021, #5 in FY2022, #4 in FY2023 and #14 in FY2025; down 3 since FY2023.
8	Clean Harbors Inc. 6 awardees, including Clean Harbors Environmental Services Inc., Safety-Kleen Systems, Inc. and Clean Harbors Caribe, Inc. Top agencies DLA (Defense Logistics Agency) USAF (Department of the Air Force) DHS (Department of Homeland Security)	$15,580,655	0.7%	Rank history: #19 in FY2021, #12 in FY2022, #6 in FY2023 and #10 in FY2025; down 2 since FY2023.
9	Guidehouse Inc. Through Aptim Federal Services, LLC Top agencies Navy (Department of the Navy) Army (Department of the Army)	$14,239,768	0.7%	Rank history: not on the FY2021–FY2023 lists and #8 in FY2025; new.
10	JFL-WCS Partners LLC Through Waste Control Specialists LLC Top agencies DOE (Department of Energy) EPA (Environmental Protection Agency)	$13,372,988	0.6%	Rank history: not on the FY2021–FY2022 lists, #15 in FY2023 and #22 in FY2025; up 5 since FY2023.
11	Horizon Environmental Services, Inc. Top agencies DLA (Defense Logistics Agency)	$12,418,592	0.6%	Rank history: #35 in FY2021, #38 in FY2022, #20 in FY2023 and #17 in FY2025; up 9 since FY2023.
12	Seaon Environmental LLC Top agencies Navy (Department of the Navy) DHS (Department of Homeland Security)	$11,690,801	0.6%	Rank history: #18 in FY2021, #11 in FY2022, #8 in FY2023 and #9 in FY2025; down 4 since FY2023.
13	US Ecology, Inc. 3 awardees, including US Ecology Holdings, Inc. and NRC Environmental Services Inc. Top agencies Army (Department of the Army) DLA (Defense Logistics Agency) DOJ (Department of Justice)	$10,304,239	0.5%	Rank history: #7 in FY2021, #4 in FY2022, #7 in FY2023 and not on the FY2025 list; down 6 since FY2023.
14	Sued-Muell GMBH & Co. KG Fuer Abfalltransporte UND Sonderabfallbeseitigung Top agencies DLA (Defense Logistics Agency)	$10,125,819	0.5%	Rank history: #22 in FY2021, #25 in FY2022, #21 in FY2023 and #19 in FY2025; up 7 since FY2023.
15	TRI-State Government Services Inc 2 awardees Top agencies DLA (Defense Logistics Agency) USAF (Department of the Air Force)	$8,698,044	0.4%	Rank history: #15 in FY2021, #22 in FY2022, #14 in FY2023 and #18 in FY2025; down 1 since FY2023.
16	Foreign Utility Consolidated Reporting Top agencies Army (Department of the Army)	$8,357,972	0.4%	Rank history: #11 in FY2021, #8 in FY2022, #12 in FY2023 and #11 in FY2025; down 4 since FY2023.
17	C & C Environmental Inc. Top agencies DLA (Defense Logistics Agency) Army (Department of the Army) DOI (Department of the Interior)	$8,284,260	0.4%	Rank history: #16 in FY2021, #13 in FY2022, #13 in FY2023 and #13 in FY2025; down 4 since FY2023.
18	Republic Services Inc. 10 awardees, including Allied Waste Services of North America, LLC, Republic Services of North Carolina LLC and Devens Recycling Center, LLC Top agencies Army (Department of the Army) DOJ (Department of Justice) Commerce (Department of Commerce)	$7,730,505	0.4%	Rank history: #58 in FY2021, #77 in FY2022, #77 in FY2023 and #24 in FY2025; up 59 since FY2023.
19	Industrial Waste Utilization, LLC Top agencies DLA (Defense Logistics Agency)	$6,992,647	0.3%	Rank history: #14 in FY2021, #17 in FY2022, #17 in FY2023 and #21 in FY2025; down 2 since FY2023.
20	Energysolutions Services, Inc. Top agencies Navy (Department of the Navy)	$6,847,306	0.3%	Rank history: not on the FY2021–FY2023 lists and #28 in FY2025; new.
21	Black Gold Industries Top agencies DLA (Defense Logistics Agency) USAF (Department of the Air Force) DHS (Department of Homeland Security)	$6,539,455	0.3%	Rank history: #13 in FY2021, #18 in FY2022, #18 in FY2023 and #23 in FY2025; down 3 since FY2023.
22	Willow Environmental Inc. Top agencies DLA (Defense Logistics Agency)	$6,438,766	0.3%	Rank history: #20 in FY2021, #26 in FY2022, #19 in FY2023 and #15 in FY2025; down 3 since FY2023.
23	Tradebe Treatment and Recycling LLC 2 awardees, including Tradebe Environmental Services, LLC Top agencies DLA (Defense Logistics Agency) VA (Department of Veterans Affairs) EPA (Environmental Protection Agency)	$5,975,599	0.3%	Rank history: #17 in FY2021, #20 in FY2022, #10 in FY2023 and not on the FY2025 list; down 13 since FY2023.
24	Inland Service Corporation, LLC Top agencies Army (Department of the Army)	$5,812,880	0.3%	Rank history: #27 in FY2021, #10 in FY2022, #26 in FY2023 and #57 in FY2025; up 2 since FY2023.
25	Advant-Edge Solutions of Middle Atlantic Inc. Top agencies DHA (Defense Health Agency) HHS (Department of Health and Human Services) Army (Department of the Army)	$5,334,040	0.3%	Rank history: #70 in FY2021, #23 in FY2022, #22 in FY2023 and #25 in FY2025; down 3 since FY2023.
26	Pacific Commercial Services, Inc. Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy) DOI (Department of the Interior)	$4,907,351	0.2%	Rank history: #41 in FY2021, #44 in FY2022, #43 in FY2023 and #26 in FY2025; up 17 since FY2023.
27	Bering-Weston JV, LLC Top agencies USAF (Department of the Air Force)	$4,499,000	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
28	Marianas Gas Corp 2 awardees Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy)	$4,361,492	0.2%	Rank history: not on the FY2021–FY2022 lists, #27 in FY2023 and #31 in FY2025; down 1 since FY2023.
29	Tradebe Environmental Services, LLC Top agencies DLA (Defense Logistics Agency) EPA (Environmental Protection Agency) USDA (Department of Agriculture)	$4,194,104	0.2%	Rank history: not on the FY2021–FY2023 lists and #20 in FY2025; new.
30	Flightfab, Inc. Top agencies Navy (Department of the Navy)	$3,920,950	0.2%	Rank history: #79 in FY2021, #50 in FY2022, #59 in FY2023 and #37 in FY2025; up 29 since FY2023.
31	Veolia Es Technical Solutions LLC Top agencies Army (Department of the Army) EPA (Environmental Protection Agency) USAF (Department of the Air Force)	$2,852,466	0.1%	Rank history: not on the FY2021–FY2023 lists and #12 in FY2025; new.
32	Krätz GMBH Top agencies Army (Department of the Army)	$2,438,636	0.1%	Rank history: #53 in FY2021, #35 in FY2022, #37 in FY2023 and #89 in FY2025; up 5 since FY2023.
33	Meadows Cmpg, Inc. Top agencies Navy (Department of the Navy) USAF (Department of the Air Force) DLA (Defense Logistics Agency)	$2,406,526	0.1%	Rank history: #52 in FY2021, #41 in FY2022, #52 in FY2023 and #29 in FY2025; up 19 since FY2023.
34	J&T Recycling Corporation 2 awardees Top agencies DLA (Defense Logistics Agency)	$2,403,463	0.1%	Rank history: #26 in FY2021, #29 in FY2022, #32 in FY2023 and #35 in FY2025; down 2 since FY2023.
35	Earth Smart Environmental Solutions LLC Top agencies VA (Department of Veterans Affairs) USDA (Department of Agriculture)	$2,299,091	0.1%	Rank history: #67 in FY2021, #61 in FY2022, #45 in FY2023 and #41 in FY2025; up 10 since FY2023.
36	Tgha Top agencies DOI (Department of the Interior)	$2,090,004	0.1%	Rank history: not on the FY2021–FY2023 lists and #39 in FY2025; new.
37	Energysolutions LLC 2 awardees, including Energysolutions Services, Inc. Top agencies Navy (Department of the Navy)	$2,081,867	0.1%	Rank history: #10 in FY2021, #6 in FY2022, #9 in FY2023 and not on the FY2025 list; down 28 since FY2023.
38	Clean Earth Systems, Inc. Top agencies DLA (Defense Logistics Agency)	$2,042,528	0.1%	Rank history: #51 in FY2021, #46 in FY2022, #42 in FY2023 and #46 in FY2025; up 4 since FY2023.
39	Arcwood Environmental, LLC Top agencies Navy (Department of the Navy) DLA (Defense Logistics Agency) DOJ (Department of Justice)	$2,010,176	0.1%	Rank history: not on the FY2021–FY2023 lists and #27 in FY2025; new.
40	Heritage Environmental Services Inc. Through Arcwood Environmental, LLC Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy) DOJ (Department of Justice)	$2,009,256	0.1%	Rank history: #28 in FY2021, #21 in FY2022, #33 in FY2023 and not on the FY2025 list; down 7 since FY2023.
41	EDM Enterprises, LLC Top agencies VA (Department of Veterans Affairs)	$1,961,620	0.1%	Rank history: #40 in FY2021, #40 in FY2022, #49 in FY2023 and #52 in FY2025; up 8 since FY2023.
42	Perma-Fix Environmental Services, Inc. Top agencies Navy (Department of the Navy)	$1,931,090	0.1%	Rank history: #44 in FY2021, #43 in FY2022, #40 in FY2023 and #50 in FY2025; down 2 since FY2023.
43	AES Asset Acquisition Corporation Top agencies DLA (Defense Logistics Agency)	$1,821,816	0.1%	Rank history: #36 in FY2021, #37 in FY2022, #34 in FY2023 and not on the FY2025 list; down 9 since FY2023.
44	Neie Medical Waste Services, LLC Top agencies VA (Department of Veterans Affairs) USDA (Department of Agriculture)	$1,700,759	0.1%	Rank history: #39 in FY2021, #30 in FY2022, #29 in FY2023 and #30 in FY2025; down 15 since FY2023.
45	Tet Consulting & Business Management Services, LLC Top agencies DHS (Department of Homeland Security)	$1,644,951	0.1%	Rank history: #54 in FY2021, #48 in FY2022, #48 in FY2023 and not on the FY2025 list; up 3 since FY2023.
46	Areaka Trading & Logistics Company Top agencies USAF (Department of the Air Force)	$1,625,280	0.1%	Rank history: #29 in FY2021, #32 in FY2022, #39 in FY2023 and #42 in FY2025; down 7 since FY2023.
47	Kipp Mickels Equipment, Inc. Top agencies DLA (Defense Logistics Agency)	$1,609,518	0.1%	Rank history: #71 in FY2021, #56 in FY2022, #73 in FY2023 and #51 in FY2025; up 26 since FY2023.
48	West Central Environmental Corp. Top agencies DLA (Defense Logistics Agency)	$1,605,336	0.1%	Rank history: #66 in FY2021, #59 in FY2022, #60 in FY2023 and #56 in FY2025; up 12 since FY2023.
49	Relife SPA Through Relife Recycling S.R.L. Top agencies DLA (Defense Logistics Agency)	$1,499,971	0.1%	Rank history: not on the FY2021–FY2022 lists, #51 in FY2023 and #53 in FY2025; up 2 since FY2023.
50	GS Environmental, Inc. Top agencies DLA (Defense Logistics Agency)	$1,492,641	0.1%	Rank history: #34 in FY2021, #39 in FY2022, #69 in FY2023 and #40 in FY2025; up 19 since FY2023.
51	ECO Environment Co., Ltd. Top agencies Army (Department of the Army)	$1,421,749	0.1%	Rank history: #62 in FY2021, #57 in FY2022, #30 in FY2023 and #54 in FY2025; down 21 since FY2023.
52	Okinawaken Sangyo Haikibutsushori Cooperative Association Top agencies Navy (Department of the Navy)	$1,400,552	0.1%	Rank history: #47 in FY2021, #51 in FY2022, #55 in FY2023 and #48 in FY2025; up 3 since FY2023.
53	Entsorgungsbetrieb Luzia Francois GMBH Top agencies USAF (Department of the Air Force)	$1,394,922	0.1%	Rank history: #43 in FY2021, #45 in FY2022, #41 in FY2023 and #72 in FY2025; down 12 since FY2023.
54	Applied Technology, Inc. Top agencies Army (Department of the Army) Navy (Department of the Navy)	$1,307,850	0.1%	Rank history: not on the FY2021 list, #72 in FY2022, #24 in FY2023 and #73 in FY2025; down 30 since FY2023.
55	NRC Environmental Services Inc. Top agencies DLA (Defense Logistics Agency)	$1,295,891	0.1%	Rank history: not on the FY2021–FY2023 lists and #36 in FY2025; new.
56	Johnsondanforth, Inc. Top agencies VA (Department of Veterans Affairs)	$1,275,371	0.1%	Rank history: #60 in FY2021, #42 in FY2022, #53 in FY2023 and not on the FY2025 list; down 3 since FY2023.
57	Guahan Waste Control, Inc. Top agencies DLA (Defense Logistics Agency)	$1,257,574	0.1%	Rank history: #63 in FY2021, #65 in FY2022, #54 in FY2023 and #66 in FY2025; down 3 since FY2023.
58	Tad Environment Top agencies DLA (Defense Logistics Agency)	$1,230,636	0.1%	Rank history: #65 in FY2021, #58 in FY2022, #58 in FY2023 and #88 in FY2025; unchanged since FY2023.
59	Remondis Industrie Service GMBH. 2 awardees, including Refood GMBH & Co. KG Top agencies DLA (Defense Logistics Agency) Army (Department of the Army)	$1,163,760	0.1%	Rank history: not on the FY2021–FY2022 lists, #84 in FY2023 and #55 in FY2025; up 25 since FY2023.
60	Logex System International GMBH Top agencies DLA (Defense Logistics Agency)	$1,106,311	0.1%	Rank history: not on the FY2021–FY2023 lists and #34 in FY2025; new.
61	Best Choice Environmental Inc. Top agencies VA (Department of Veterans Affairs)	$1,101,274	0.1%	Rank history: not on the FY2021–FY2022 lists, #91 in FY2023 and #74 in FY2025; up 30 since FY2023.
62	Jfe-K Ryukyu Logistic JV Top agencies DLA (Defense Logistics Agency)	$1,093,678	0.1%	Rank history: #45 in FY2021, #16 in FY2022, #16 in FY2023 and #45 in FY2025; down 46 since FY2023.
63	Kimin Eng Co., Ltd. Top agencies DLA (Defense Logistics Agency)	$1,073,540	0.1%	Rank history: #75 in FY2021, #62 in FY2022, #50 in FY2023 and not on the FY2025 list; down 13 since FY2023.
64	TD Environmental Inc. Top agencies DLA (Defense Logistics Agency)	$1,060,709	0.1%	Rank history: #50 in FY2021, #73 in FY2022, #70 in FY2023 and #63 in FY2025; up 6 since FY2023.
65	Lewis Environmental LLC Top agencies USDA (Department of Agriculture) Army (Department of the Army)	$1,049,119	<0.1%	Rank history: not on the FY2021 list, #19 in FY2022, not on the FY2023 list and not on the FY2025 list; returned.
66	Shimada Shokai Co., Ltd Top agencies DLA (Defense Logistics Agency)	$1,038,724	<0.1%	Rank history: #48 in FY2021, #63 in FY2022, #63 in FY2023 and #49 in FY2025; down 3 since FY2023.
67	Logex System GMBH &Co. KG Through Logex System International GMBH Top agencies DLA (Defense Logistics Agency)	$915,976	<0.1%	Rank history: #37 in FY2021, #34 in FY2022, #38 in FY2023 and not on the FY2025 list; down 29 since FY2023.
68	Veolia Water North America-West LLC 2 awardees, including Veolia Es Technical Solutions LLC and Veolia Es (Uk) Limited Top agencies Army (Department of the Army) DLA (Defense Logistics Agency) EPA (Environmental Protection Agency)	$855,414	<0.1%	Rank history: #32 in FY2021, #36 in FY2022, #31 in FY2023 and not on the FY2025 list; down 37 since FY2023.
69	Waste Management, Inc. 10 awardees, including Waste Management of Texas, Inc., Reno Disposal Co. and King George Landfill, Inc. Top agencies Army (Department of the Army) VA (Department of Veterans Affairs) DOJ (Department of Justice)	$840,303	<0.1%	Rank history: #94 in FY2021, not on the FY2022 list, #100 in FY2023 and not on the FY2025 list; up 31 since FY2023.
70	EWA Direction Inc. Top agencies VA (Department of Veterans Affairs)	$834,404	<0.1%	Rank history: #86 in FY2021, not on the FY2022–FY2023 lists and #47 in FY2025; up 82 since FY2023.
71	Lincoln Environmental Services, Inc. Top agencies USAF (Department of the Air Force)	$821,224	<0.1%	Rank history: #80 in FY2021, #74 in FY2022, not on the FY2023 list and #67 in FY2025; up 116 since FY2023.
72	Daebo Industrial Co., Ltd. Top agencies Army (Department of the Army)	$818,494	<0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
73	Kankyo Solution Co. Ltd. Top agencies Navy (Department of the Navy)	$775,501	<0.1%	Rank history: #68 in FY2021, #79 in FY2022, #83 in FY2023 and not on the FY2025 list; up 10 since FY2023.
74	Horizon Environmental Solutions Corporation Top agencies DLA (Defense Logistics Agency)	$770,969	<0.1%	Rank history: #97 in FY2021, #91 in FY2022, #36 in FY2023 and #91 in FY2025; down 38 since FY2023.
75	Onaka Gumi Co.,Ltd. Top agencies DLA (Defense Logistics Agency)	$760,991	<0.1%	Rank history: #82 in FY2021, #78 in FY2022, not on the FY2023 list and #64 in FY2025; up 35 since FY2023.
76	Up-Side Management Co Top agencies Army (Department of the Army)	$733,954	<0.1%	Rank history: not on the FY2021–FY2023 lists and #93 in FY2025; up 35 since FY2023.
77	Auxilio Management Services Top agencies DOI (Department of the Interior)	$728,233	<0.1%	Rank history: not on the FY2021 list, #70 in FY2022, #71 in FY2023 and #77 in FY2025; down 6 since FY2023.
78	Broadview Waste Solutions, Inc. Top agencies VA (Department of Veterans Affairs) HHS (Department of Health and Human Services)	$668,435	<0.1%	Rank history: not on the FY2021–FY2022 lists, #57 in FY2023 and #75 in FY2025; down 21 since FY2023.
79	Stericycle Inc Top agencies VA (Department of Veterans Affairs) HHS (Department of Health and Human Services) DOJ (Department of Justice)	$650,524	<0.1%	Rank history: not on the FY2021–FY2022 lists, #82 in FY2023 and #61 in FY2025; up 3 since FY2023.
80	Lormar Reclamation Service, LLC Top agencies USAF (Department of the Air Force)	$641,125	<0.1%	Rank history: #90 in FY2021, #89 in FY2022, not on the FY2023 list and #80 in FY2025; returned.
81	Rethmann AG & Co. KG Through Remondis GMBH Top agencies Army (Department of the Army)	$640,767	<0.1%	Rank history: #59 in FY2021, #53 in FY2022, #67 in FY2023 and not on the FY2025 list; down 14 since FY2023.
82	Air Pollution Control Products Inc. Top agencies DOD (Department of Defense)	$618,760	<0.1%	Rank history: #88 in FY2021, #92 in FY2022, #61 in FY2023 and #78 in FY2025; down 21 since FY2023.
83	Perikin Enterprises LLC Top agencies Army (Department of the Army)	$606,688	<0.1%	Rank history: not on the FY2021–FY2022 lists, #78 in FY2023 and #82 in FY2025; down 5 since FY2023.
84	Cinka Construction & Consulting Services LLC Top agencies DHS (Department of Homeland Security)	$603,673	<0.1%	Rank history: not on the FY2021 list, #85 in FY2022, #79 in FY2023 and #81 in FY2025; down 5 since FY2023.
85	Tigua Facility Services, Inc. Top agencies DHS (Department of Homeland Security)	$541,268	<0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
86	Reworld Holding Corporation 6 awardees, including Reworld Solutions, LLC and Covanta Stanislaus Inc. Top agencies NARA (National Archives and Records Administration) DOJ (Department of Justice) DHS (Department of Homeland Security)	$536,980	<0.1%	Rank history: not on the FY2021–FY2022 lists, #80 in FY2023 and not on the FY2025 list; down 6 since FY2023.
87	Willkom, Inc. Top agencies DLA (Defense Logistics Agency)	$532,246	<0.1%	Rank history: #72 in FY2021, #68 in FY2022, #76 in FY2023 and not on the FY2025 list; down 11 since FY2023.
88	Rad Solutions LLC Top agencies DOI (Department of the Interior) Army (Department of the Army)	$512,629	<0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; up 79 since FY2023.
89	Phoenix Corp of the Quad Cities Top agencies Army (Department of the Army)	$508,721	<0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
90	BWX Technologies, Inc. Through Bwxt Nog Technologies, Inc. Top agencies DOE (Department of Energy)	$500,737	<0.1%	Rank history: #95 in FY2021, #93 in FY2022, #90 in FY2023 and not on the FY2025 list; unchanged since FY2023.
91	Biofiltro USA Inc. Top agencies DHS (Department of Homeland Security)	$500,000	<0.1%	Rank history: #99 in FY2021, #96 in FY2022, #95 in FY2023 and not on the FY2025 list; up 4 since FY2023.
92	Hamilton Alliance Inc. Top agencies VA (Department of Veterans Affairs) DOJ (Department of Justice) SSA (Social Security Administration)	$487,643	<0.1%	Rank history: not on the FY2021 list, #100 in FY2022, #87 in FY2023 and #58 in FY2025; down 5 since FY2023.
93	Hosan Environment Co., Ltd. Top agencies Army (Department of the Army)	$479,867	<0.1%	Rank history: not on the FY2021–FY2022 lists, #92 in FY2023 and not on the FY2025 list; down 1 since FY2023.
94	Nambu Service Co., Ltd. Top agencies Army (Department of the Army)	$469,268	<0.1%	Rank history: not on the FY2021 list, #99 in FY2022, #68 in FY2023 and #71 in FY2025; down 26 since FY2023.
95	Ncns Environmental, Inc. Top agencies VA (Department of Veterans Affairs)	$464,903	<0.1%	Rank history: #96 in FY2021, not on the FY2022–FY2023 lists and not on the FY2025 list; up 18 since FY2023.
96	Action Services Corp Top agencies Army (Department of the Army)	$436,331	<0.1%	Rank history: not on the FY2021–FY2022 lists, #96 in FY2023 and #95 in FY2025; unchanged since FY2023.
97	D'S Ventures, LLC Top agencies USAF (Department of the Air Force)	$425,805	<0.1%	Rank history: not on the FY2021–FY2022 lists, #75 in FY2023 and not on the FY2025 list; down 22 since FY2023.
98	Sal Construction Co. Top agencies HHS (Department of Health and Human Services)	$412,740	<0.1%	Rank history: not on the FY2021–FY2022 lists, #99 in FY2023 and not on the FY2025 list; up 1 since FY2023.
99	Cherokee Nation Environmental Solutions, L.L.C. Top agencies DLA (Defense Logistics Agency)	$411,009	<0.1%	Rank history: not on the FY2021–FY2023 lists and #97 in FY2025; up 21 since FY2023.
100	Yamaki Co., Ltd. Top agencies Navy (Department of the Navy) USAF (Department of the Air Force)	$402,928	<0.1%	Rank history: #85 in FY2021, #82 in FY2022, #88 in FY2023 and not on the FY2025 list; down 12 since FY2023.

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100 of 516 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	$2,060,643,790	Amentum 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 $2.12 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 2024 ran Oct 1, 2023 – Sep 30, 2024. 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 FY2023. "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 FY2023 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 FY2024?

1. Amentum Services, Inc. ($639M), 2. Bechtel Corp ($546M), 3. Bechtel Parsons Blue Grass, A Joint Venture ($355M), 4. Amentum Holdings, Inc. ($136M), 5. ECC Constructors LLC ($47.7M), 6. Inmar Clearing Inc. ($30M), 7. Environmental Rail Solutions Inc. ($16.2M), 8. Clean Harbors Inc. ($15.6M), 9. Guidehouse Inc. ($14.2M), 10. JFL-WCS Partners LLC ($13.4M).

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