Top 100 Contractors in NAICS 5622: Waste Treatment and Disposal, Aug 2025–Jul 2026

Name: Top 100 Contractors in NAICS 5622: Waste Treatment and Disposal, Aug 2025–Jul 2026
Creator: GovTribe
License: https://creativecommons.org/licenses/by/4.0/

Parent companies by net contract obligations Aug 1, 2025 – Jul 31, 2026 Code page on GovTribe

The latest 12 months. See the newest fiscal year's list: Top Contractors in NAICS 5622: Waste Treatment and Disposal, FY2025.

The top 10 won 68% of NAICS 5622 contract dollars from August 2025 through July 2026

Contract obligations: $1,523,736,581 Net of deobligations, by contracts coded NAICS 5622 or a code under it
Contractors: 431 Parent companies with an obligation
Largest contractor: Hanford Tank Waste Operations & Closure, LLC $891 million, 47.9% of obligations
Data as of: Nov 5, 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)	$890,912,411	47.9%	Rank history: not on the FY2021–FY2022 lists, #62 in FY2023, not on the FY2024 list and #1 in FY2025; unchanged since Aug 2024–Jul 2025.
2	Bechtel Parsons Blue Grass, A Joint Venture Top agencies Army (Department of the Army)	$119,599,732	6.4%	Rank history: not on the FY2021–FY2023 lists, #3 in FY2024 and #2 in FY2025; unchanged since Aug 2024–Jul 2025.
3	Bechtel Corp Through Bechtel National, Inc. Top agencies Army (Department of the Army)	$118,193,551	6.4%	Rank history: #2 in FY2021, #2 in FY2022, #1 in FY2023, #2 in FY2024 and #3 in FY2025; unchanged since Aug 2024–Jul 2025.
4	Inmar RX Solutions Inc. Top agencies HHS (Department of Health and Human Services)	$40,722,298	2.2%	Rank history: not on the FY2021–FY2025 lists; up 291 since Aug 2024–Jul 2025.
5	The Aleut Corporation Through Aleut Environmental Remediation, LLC Top agencies Army (Department of the Army)	$22,408,328	1.2%	Rank history: not on the FY2021–FY2024 lists and #7 in FY2025; new, not ranked in Aug 2024–Jul 2025.
6	ECC Constructors LLC Top agencies Army (Department of the Army)	$20,359,788	1.1%	Rank history: not on the FY2021–FY2023 lists, #5 in FY2024 and not on the FY2025 list; down 1 since Aug 2024–Jul 2025.
7	Environmental Rail Solutions Inc. Top agencies Army (Department of the Army)	$17,957,146	1.0%	Rank history: #57 in FY2021, #5 in FY2022, #4 in FY2023, #7 in FY2024 and #16 in FY2025; up 4 since Aug 2024–Jul 2025.
8	Guidehouse Inc. 2 awardees, including Aptim Federal Services, LLC Top agencies Navy (Department of the Navy)	$15,054,839	0.8%	Rank history: not on the FY2021–FY2023 lists, #9 in FY2024 and #8 in FY2025; unchanged since Aug 2024–Jul 2025.
9	Clean Harbors Inc. Through Clean Harbors Environmental Services Inc. Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy) VA (Department of Veterans Affairs)	$13,481,742	0.7%	Rank history: #19 in FY2021, #12 in FY2022, #6 in FY2023, #8 in FY2024 and #11 in FY2025; unchanged since Aug 2024–Jul 2025.
10	Seaon Environmental LLC Top agencies Navy (Department of the Navy)	$11,796,491	0.6%	Rank history: #18 in FY2021, #11 in FY2022, #8 in FY2023, #12 in FY2024 and #9 in FY2025; down 4 since Aug 2024–Jul 2025.
11	Montezuma Wetlands LLC Top agencies Army (Department of the Army)	$11,177,050	0.6%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Aug 2024–Jul 2025.
12	Veolia Es Technical Solutions LLC Top agencies Army (Department of the Army) DOJ (Department of Justice) EPA (Environmental Protection Agency)	$10,352,178	0.6%	Rank history: not on the FY2021–FY2023 lists, #31 in FY2024 and #13 in FY2025; up 11 since Aug 2024–Jul 2025.
13	Foreign Utility Consolidated Reporting Top agencies Army (Department of the Army)	$9,843,325	0.5%	Rank history: #11 in FY2021, #8 in FY2022, #12 in FY2023, #16 in FY2024 and #12 in FY2025; down 3 since Aug 2024–Jul 2025.
14	Willow Environmental Inc. Top agencies DLA (Defense Logistics Agency)	$9,714,680	0.5%	Rank history: #20 in FY2021, #26 in FY2022, #19 in FY2023, #22 in FY2024 and #17 in FY2025; up 1 since Aug 2024–Jul 2025.
15	TRI-State Government Services Inc Top agencies DLA (Defense Logistics Agency)	$9,517,761	0.5%	Rank history: #15 in FY2021, #22 in FY2022, #14 in FY2023, #15 in FY2024 and #19 in FY2025; up 1 since Aug 2024–Jul 2025.
16	Tradebe Environmental Services, LLC Top agencies DLA (Defense Logistics Agency) EPA (Environmental Protection Agency)	$9,413,821	0.5%	Rank history: not on the FY2021–FY2023 lists, #29 in FY2024 and #15 in FY2025; up 2 since Aug 2024–Jul 2025.
17	C & C Environmental Inc. Top agencies DLA (Defense Logistics Agency) Army (Department of the Army) EPA (Environmental Protection Agency)	$9,065,379	0.5%	Rank history: #16 in FY2021, #13 in FY2022, #13 in FY2023, #17 in FY2024 and #14 in FY2025; down 5 since Aug 2024–Jul 2025.
18	JFL-WCS Partners LLC Through Waste Control Specialists LLC Top agencies DOE (Department of Energy) Army (Department of the Army) EPA (Environmental Protection Agency)	$8,790,270	0.5%	Rank history: not on the FY2021–FY2022 lists, #15 in FY2023, #10 in FY2024 and #22 in FY2025; down 11 since Aug 2024–Jul 2025.
19	Industrial Waste Utilization, LLC Top agencies DLA (Defense Logistics Agency)	$7,952,302	0.4%	Rank history: not on the FY2021–FY2024 lists and #21 in FY2025; new, not ranked in Aug 2024–Jul 2025.
20	Energysolutions, LLC 2 awardees, including Energysolutions Services, Inc. Top agencies Navy (Department of the Navy) DOE (Department of Energy)	$7,777,319	0.4%	Rank history: not on the FY2021–FY2024 lists and #10 in FY2025; down 6 since Aug 2024–Jul 2025.
21	Horizon Environmental Services, Inc. Top agencies DLA (Defense Logistics Agency)	$7,045,812	0.4%	Rank history: #35 in FY2021, #38 in FY2022, #20 in FY2023, #11 in FY2024 and #18 in FY2025; down 8 since Aug 2024–Jul 2025.
22	Black Gold Industries Top agencies DLA (Defense Logistics Agency)	$6,762,012	0.4%	Rank history: #13 in FY2021, #18 in FY2022, #18 in FY2023, #21 in FY2024 and #23 in FY2025; up 2 since Aug 2024–Jul 2025.
23	Sued-Muell GMBH & Co. KG Fuer Abfalltransporte UND Sonderabfallbeseitigung Top agencies DLA (Defense Logistics Agency)	$6,072,765	0.3%	Rank history: #22 in FY2021, #25 in FY2022, #21 in FY2023, #14 in FY2024 and #20 in FY2025; down 6 since Aug 2024–Jul 2025.
24	Neie Medical Waste Services, LLC Top agencies VA (Department of Veterans Affairs) USDA (Department of Agriculture)	$5,604,978	0.3%	Rank history: #39 in FY2021, #30 in FY2022, #29 in FY2023, #44 in FY2024 and #29 in FY2025; up 2 since Aug 2024–Jul 2025.
25	Harsco Corporation Through AES Asset Acquisition Corporation Top agencies DLA (Defense Logistics Agency)	$5,483,474	0.3%	Rank history: not on the FY2021–FY2024 lists and #35 in FY2025; up 31 since Aug 2024–Jul 2025.
26	Republic Services Inc. 15 awardees, including Allied Waste Services of North America, LLC, Advanced Chemical Transport LLC and Honeygo Run Reclamation Center, Inc. Top agencies Army (Department of the Army) DOJ (Department of Justice) DOI (Department of the Interior)	$5,412,308	0.3%	Rank history: #58 in FY2021, #77 in FY2022, #77 in FY2023, #18 in FY2024 and #24 in FY2025; down 6 since Aug 2024–Jul 2025.
27	Advant-Edge Solutions of Middle Atlantic Inc. Top agencies DHA (Defense Health Agency) HHS (Department of Health and Human Services) VA (Department of Veterans Affairs)	$4,926,830	0.3%	Rank history: #70 in FY2021, #23 in FY2022, #22 in FY2023, #25 in FY2024 and #25 in FY2025; down 5 since Aug 2024–Jul 2025.
28	Flightfab, Inc. Top agencies Navy (Department of the Navy)	$4,036,461	0.2%	Rank history: #79 in FY2021, #50 in FY2022, #59 in FY2023, #30 in FY2024 and #36 in FY2025; up 11 since Aug 2024–Jul 2025.
29	Inland Service Corporation, LLC Top agencies Army (Department of the Army)	$3,890,986	0.2%	Rank history: #27 in FY2021, #10 in FY2022, #26 in FY2023, #24 in FY2024 and #55 in FY2025; unchanged since Aug 2024–Jul 2025.
30	Lincoln Environmental Services, Inc. Top agencies USAF (Department of the Air Force)	$3,568,452	0.2%	Rank history: #80 in FY2021, #74 in FY2022, not on the FY2023 list, #71 in FY2024 and #65 in FY2025; up 36 since Aug 2024–Jul 2025.
31	Amentum Holdings, Inc. Through Washington River Protection Solutions LLC Top agencies DOE (Department of Energy)	$3,150,000	0.2%	Rank history: not on the FY2021–FY2023 lists, #4 in FY2024 and #5 in FY2025; down 27 since Aug 2024–Jul 2025.
32	Arcwood Environmental, LLC Top agencies Navy (Department of the Navy) DLA (Defense Logistics Agency) DOJ (Department of Justice)	$2,909,378	0.2%	Rank history: not on the FY2021–FY2023 lists, #39 in FY2024 and #27 in FY2025; up 1 since Aug 2024–Jul 2025.
33	Areaka Trading & Logistics Company Top agencies USAF (Department of the Air Force)	$2,851,940	0.2%	Rank history: #29 in FY2021, #32 in FY2022, #39 in FY2023, #46 in FY2024 and #40 in FY2025; up 9 since Aug 2024–Jul 2025.
34	Logex System International GMBH Top agencies DLA (Defense Logistics Agency)	$2,818,064	0.2%	Rank history: not on the FY2021–FY2023 lists, #60 in FY2024 and #32 in FY2025; up 1 since Aug 2024–Jul 2025.
35	Pacific Commercial Services, Inc. Top agencies DLA (Defense Logistics Agency)	$2,770,357	0.1%	Rank history: #41 in FY2021, #44 in FY2022, #43 in FY2023, #26 in FY2024 and #26 in FY2025; down 14 since Aug 2024–Jul 2025.
36	J&T Recycling Corporation Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy)	$2,704,016	0.1%	Rank history: #26 in FY2021, #29 in FY2022, #32 in FY2023, #34 in FY2024 and #33 in FY2025; down 4 since Aug 2024–Jul 2025.
37	Dorado-Meadows JV LLC Top agencies Navy (Department of the Navy)	$2,664,595	0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Aug 2024–Jul 2025.
38	Marianas Gas Corp Top agencies DLA (Defense Logistics Agency)	$2,585,199	0.1%	Rank history: not on the FY2021–FY2022 lists, #27 in FY2023, #28 in FY2024 and #30 in FY2025; down 13 since Aug 2024–Jul 2025.
39	Meadows Cmpg, Inc. Top agencies Navy (Department of the Navy) USAF (Department of the Air Force)	$2,585,149	0.1%	Rank history: #52 in FY2021, #41 in FY2022, #52 in FY2023, #33 in FY2024 and #28 in FY2025; down 8 since Aug 2024–Jul 2025.
40	Tatonka Trucking Llc. Top agencies IBWC (International Boundary and Water Commission U.S.-Mexico)	$2,311,680	0.1%	Rank history: not on the FY2021–FY2024 lists and #66 in FY2025; new, not ranked in Aug 2024–Jul 2025.
41	GS Environmental, Inc. Top agencies DLA (Defense Logistics Agency)	$2,269,384	0.1%	Rank history: #34 in FY2021, #39 in FY2022, #69 in FY2023, #50 in FY2024 and #38 in FY2025; down 4 since Aug 2024–Jul 2025.
42	Advance Engineering and Construction L.L.C. Top agencies USAF (Department of the Air Force)	$2,119,634	0.1%	Rank history: not on the FY2021–FY2022 lists, #44 in FY2023, not on the FY2024 list and #41 in FY2025; up 1 since Aug 2024–Jul 2025.
43	Earth Smart Environmental Solutions LLC Top agencies VA (Department of Veterans Affairs)	$2,026,701	0.1%	Rank history: #67 in FY2021, #61 in FY2022, #45 in FY2023, #35 in FY2024 and #39 in FY2025; down 9 since Aug 2024–Jul 2025.
44	Triumvirate Environmental, LLC 2 awardees, including West Central Environmental Corp. Top agencies DLA (Defense Logistics Agency) Army (Department of the Army)	$2,019,864	0.1%	Rank history: not on the FY2021–FY2024 lists and #50 in FY2025; up 96 since Aug 2024–Jul 2025.
45	TD Environmental Inc. Top agencies DLA (Defense Logistics Agency)	$2,012,571	0.1%	Rank history: #50 in FY2021, #73 in FY2022, #70 in FY2023, #64 in FY2024 and #61 in FY2025; up 37 since Aug 2024–Jul 2025.
46	Tgha Top agencies DOI (Department of the Interior)	$1,999,295	0.1%	Rank history: not on the FY2021–FY2023 lists, #36 in FY2024 and #37 in FY2025; down 8 since Aug 2024–Jul 2025.
47	Relife Recycling S.R.L. Top agencies DLA (Defense Logistics Agency)	$1,929,719	0.1%	Rank history: not on the FY2021–FY2022 lists, #51 in FY2023, #49 in FY2024 and #52 in FY2025; up 2 since Aug 2024–Jul 2025.
48	NRC Environmental Services Inc. Top agencies DLA (Defense Logistics Agency)	$1,770,033	0.1%	Rank history: not on the FY2021–FY2023 lists, #55 in FY2024 and #34 in FY2025; down 12 since Aug 2024–Jul 2025.
49	Aim Consulting, LLC Top agencies DHS (Department of Homeland Security)	$1,718,288	0.1%	Rank history: not on the FY2021–FY2024 lists and #42 in FY2025; down 4 since Aug 2024–Jul 2025.
50	EDM Enterprises, LLC Top agencies VA (Department of Veterans Affairs)	$1,619,264	0.1%	Rank history: #40 in FY2021, #40 in FY2022, #49 in FY2023, #41 in FY2024 and #51 in FY2025; up 7 since Aug 2024–Jul 2025.
51	Guahan Waste Control, Inc. Top agencies DLA (Defense Logistics Agency)	$1,599,504	0.1%	Rank history: #63 in FY2021, #65 in FY2022, #54 in FY2023, #57 in FY2024 and #64 in FY2025; up 17 since Aug 2024–Jul 2025.
52	Jfe-K Ryukyu Logistic JV Top agencies DLA (Defense Logistics Agency)	$1,582,273	0.1%	Rank history: #45 in FY2021, #16 in FY2022, #16 in FY2023, #62 in FY2024 and #43 in FY2025; up 10 since Aug 2024–Jul 2025.
53	Okinawaken Sangyo Haikibutsushori Cooperative Association Top agencies Navy (Department of the Navy)	$1,580,061	0.1%	Rank history: #47 in FY2021, #51 in FY2022, #55 in FY2023, #52 in FY2024 and #46 in FY2025; down 3 since Aug 2024–Jul 2025.
54	ECO Environment Co., Ltd. Top agencies Army (Department of the Army)	$1,568,412	0.1%	Rank history: #62 in FY2021, #57 in FY2022, #30 in FY2023, #51 in FY2024 and #53 in FY2025; unchanged since Aug 2024–Jul 2025.
55	EWA Direction Inc. Top agencies VA (Department of Veterans Affairs)	$1,469,412	0.1%	Rank history: #86 in FY2021, not on the FY2022–FY2023 lists, #70 in FY2024 and #45 in FY2025; down 9 since Aug 2024–Jul 2025.
56	Shimada Shokai Co., Ltd Top agencies DLA (Defense Logistics Agency)	$1,444,937	0.1%	Rank history: #48 in FY2021, #63 in FY2022, #63 in FY2023, #66 in FY2024 and #47 in FY2025; down 9 since Aug 2024–Jul 2025.
57	Vergara AG Service Inc. Top agencies DLA (Defense Logistics Agency)	$1,328,000	0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Aug 2024–Jul 2025.
58	Applied Technology, Inc. Top agencies Navy (Department of the Navy) Army (Department of the Army)	$1,177,132	0.1%	Rank history: not on the FY2021 list, #72 in FY2022, #24 in FY2023, #54 in FY2024 and #71 in FY2025; up 5 since Aug 2024–Jul 2025.
59	Tad Environment Top agencies DLA (Defense Logistics Agency)	$1,130,263	0.1%	Rank history: #65 in FY2021, #58 in FY2022, #58 in FY2023, #58 in FY2024 and #87 in FY2025; up 8 since Aug 2024–Jul 2025.
60	Reworld Holding Corporation 5 awardees, including Reworld Solutions, LLC, Reworld Tulsa, LLC and Reworld Indianapolis, Inc. Top agencies DOJ (Department of Justice) HHS (Department of Health and Human Services) Treasury (Department of the Treasury)	$1,033,635	0.1%	Rank history: not on the FY2021–FY2022 lists, #80 in FY2023, #86 in FY2024 and #74 in FY2025; up 82 since Aug 2024–Jul 2025.
61	Specs Chemical Services, LLC Top agencies Army (Department of the Army)	$1,029,000	0.1%	Rank history: not on the FY2021–FY2024 lists and #60 in FY2025; new, not ranked in Aug 2024–Jul 2025.
62	Krätz GMBH Top agencies Army (Department of the Army)	$1,015,439	0.1%	Rank history: #53 in FY2021, #35 in FY2022, #37 in FY2023, #32 in FY2024 and #88 in FY2025; down 14 since Aug 2024–Jul 2025.
63	American Vet Solutions Inc. Top agencies VA (Department of Veterans Affairs) DOJ (Department of Justice)	$1,008,022	0.1%	Rank history: not on the FY2021–FY2024 lists and #63 in FY2025; up 1 since Aug 2024–Jul 2025.
64	Remondis Industrie Service GMBH. 2 awardees, including Refood GMBH & Co. KG Top agencies DLA (Defense Logistics Agency) Army (Department of the Army)	$1,002,884	0.1%	Rank history: not on the FY2021–FY2022 lists, #84 in FY2023, #59 in FY2024 and #54 in FY2025; down 12 since Aug 2024–Jul 2025.
65	Waste Management Collection and Recycling Inc 15 awardees, including Waste Management of Texas, Inc., King George Landfill, Inc. and RTS Landfill, Inc. Top agencies Army (Department of the Army) DOJ (Department of Justice) VA (Department of Veterans Affairs)	$983,299	0.1%	Rank history: not on the FY2021–FY2025 lists; up 67 since Aug 2024–Jul 2025.
66	Onaka Gumi Co.,Ltd. Top agencies DLA (Defense Logistics Agency)	$934,374	0.1%	Rank history: #82 in FY2021, #78 in FY2022, not on the FY2023 list, #75 in FY2024 and #62 in FY2025; down 8 since Aug 2024–Jul 2025.
67	Broadview Waste Solutions, Inc. Top agencies VA (Department of Veterans Affairs) HHS (Department of Health and Human Services)	$921,430	<0.1%	Rank history: not on the FY2021–FY2022 lists, #57 in FY2023, #78 in FY2024 and #73 in FY2025; up 7 since Aug 2024–Jul 2025.
68	Remondis GMBH 2 awardees Top agencies Army (Department of the Army)	$911,962	<0.1%	Rank history: not on the FY2021–FY2024 lists and #84 in FY2025; up 33 since Aug 2024–Jul 2025.
69	Kankyo Solution Co.,Ltd Top agencies Navy (Department of the Navy)	$856,634	<0.1%	Rank history: not on the FY2021–FY2024 lists and #68 in FY2025; down 4 since Aug 2024–Jul 2025.
70	Veolia ES (UK) Limited Top agencies DLA (Defense Logistics Agency)	$854,774	<0.1%	Rank history: not on the FY2021–FY2024 lists and #78 in FY2025; up 9 since Aug 2024–Jul 2025.
71	ECO Energy Korea Co., Ltd Top agencies DLA (Defense Logistics Agency)	$846,126	<0.1%	Rank history: not on the FY2021–FY2024 lists and #57 in FY2025; down 18 since Aug 2024–Jul 2025.
72	Chenega-Salas O'brien JV, LLC Top agencies Army (Department of the Army)	$782,760	<0.1%	Rank history: not on the FY2021–FY2024 lists and #67 in FY2025; up 55 since Aug 2024–Jul 2025.
73	Stericycle Inc 2 awardees Top agencies VA (Department of Veterans Affairs) DOJ (Department of Justice) USAF (Department of the Air Force)	$782,725	<0.1%	Rank history: not on the FY2021–FY2022 lists, #82 in FY2023, #79 in FY2024 and #59 in FY2025; down 12 since Aug 2024–Jul 2025.
74	Auxilio Management Services Top agencies DOI (Department of the Interior)	$748,327	<0.1%	Rank history: not on the FY2021 list, #70 in FY2022, #71 in FY2023, #77 in FY2024 and #76 in FY2025; down 1 since Aug 2024–Jul 2025.
75	Clean Earth Systems, Inc. Top agencies DLA (Defense Logistics Agency)	$722,010	<0.1%	Rank history: #51 in FY2021, #46 in FY2022, #42 in FY2023, #38 in FY2024 and #44 in FY2025; down 35 since Aug 2024–Jul 2025.
76	Lewis Environmental LLC Top agencies USDA (Department of Agriculture)	$708,988	<0.1%	Rank history: not on the FY2021 list, #19 in FY2022, not on the FY2023 list, #65 in FY2024 and not on the FY2025 list; up 343 since Aug 2024–Jul 2025.
77	Terrabella Environmental Services Inc. Top agencies DHS (Department of Homeland Security) DLA (Defense Logistics Agency) Navy (Department of the Navy)	$698,063	<0.1%	Rank history: not on the FY2021–FY2025 lists; up 81 since Aug 2024–Jul 2025.
78	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, #82 in FY2024 and #77 in FY2025; new, not ranked in Aug 2024–Jul 2025.
79	Lormar Reclamation Service, LLC Top agencies USAF (Department of the Air Force)	$679,047	<0.1%	Rank history: #90 in FY2021, #89 in FY2022, not on the FY2023 list, #80 in FY2024 and #79 in FY2025; down 4 since Aug 2024–Jul 2025.
80	Iron Enterprise LLC Top agencies VA (Department of Veterans Affairs) DOJ (Department of Justice)	$668,806	<0.1%	Rank history: not on the FY2021–FY2024 lists and #89 in FY2025; up 7 since Aug 2024–Jul 2025.
81	Pacific Coast Contracting Group Top agencies VA (Department of Veterans Affairs)	$645,367	<0.1%	Rank history: not on the FY2021–FY2024 lists and #75 in FY2025; up 104 since Aug 2024–Jul 2025.
82	Kodiak Island Borough Top agencies DHS (Department of Homeland Security)	$640,488	<0.1%	Rank history: not on the FY2021–FY2024 lists and #83 in FY2025; down 5 since Aug 2024–Jul 2025.
83	Vesequ LLC Top agencies VA (Department of Veterans Affairs)	$640,000	<0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Aug 2024–Jul 2025.
84	Essinem LLC Top agencies USDA (Department of Agriculture)	$637,512	<0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Aug 2024–Jul 2025.
85	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, #84 in FY2024 and #80 in FY2025; down 5 since Aug 2024–Jul 2025.
86	Advetage Solutions LLC Top agencies Army (Department of the Army)	$606,308	<0.1%	Rank history: not on the FY2021–FY2024 lists and #82 in FY2025; up 176 since Aug 2024–Jul 2025.
87	Nambu Service Co., Ltd. Top agencies Army (Department of the Army)	$602,343	<0.1%	Rank history: not on the FY2021 list, #99 in FY2022, #68 in FY2023, #94 in FY2024 and #69 in FY2025; down 17 since Aug 2024–Jul 2025.
88	Koman Government Solutions LLC Top agencies Navy (Department of the Navy)	$574,788	<0.1%	Rank history: not on the FY2021–FY2024 lists and #95 in FY2025; up 4 since Aug 2024–Jul 2025.
89	Meltec Iwaki Co., Ltd. Top agencies USAF (Department of the Air Force)	$567,378	<0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Aug 2024–Jul 2025.
90	Mediwaste Disposal, LLC Top agencies VA (Department of Veterans Affairs)	$540,000	<0.1%	Rank history: not on the FY2021–FY2025 lists; up 18 since Aug 2024–Jul 2025.
91	Hamilton Alliance Inc. Top agencies VA (Department of Veterans Affairs) DOJ (Department of Justice)	$516,321	<0.1%	Rank history: not on the FY2021 list, #100 in FY2022, #87 in FY2023, #92 in FY2024 and #56 in FY2025; down 36 since Aug 2024–Jul 2025.
92	Ncns Environmental, Inc. Top agencies VA (Department of Veterans Affairs)	$505,002	<0.1%	Rank history: #96 in FY2021, not on the FY2022–FY2023 lists, #95 in FY2024 and not on the FY2025 list; up 34 since Aug 2024–Jul 2025.
93	Whitewater Environmental LLC Top agencies USAF (Department of the Air Force)	$477,096	<0.1%	Rank history: not on the FY2021–FY2024 lists and #98 in FY2025; up 3 since Aug 2024–Jul 2025.
94	BWX Technologies, Inc. Through Bwxt Nog Technologies, Inc. Top agencies DOE (Department of Energy)	$474,869	<0.1%	Rank history: #95 in FY2021, #93 in FY2022, #90 in FY2023, #90 in FY2024 and not on the FY2025 list; up 23 since Aug 2024–Jul 2025.
95	Action Services Corporation Top agencies Army (Department of the Army)	$461,214	<0.1%	Rank history: not on the FY2021–FY2022 lists, #96 in FY2023, #96 in FY2024 and #94 in FY2025; down 4 since Aug 2024–Jul 2025.
96	Street Legal Industries LLC Top agencies DLA (Defense Logistics Agency)	$439,260	<0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Aug 2024–Jul 2025.
97	Hosan Environment Co., Ltd. Top agencies Army (Department of the Army)	$425,947	<0.1%	Rank history: not on the FY2021–FY2022 lists, #92 in FY2023, #93 in FY2024 and not on the FY2025 list; up 5 since Aug 2024–Jul 2025.
98	Horizon Environmental Solutions Corporation Top agencies DLA (Defense Logistics Agency)	$419,943	<0.1%	Rank history: #97 in FY2021, #91 in FY2022, #36 in FY2023, #74 in FY2024 and #90 in FY2025; down 22 since Aug 2024–Jul 2025.
99	August Mack Environmental, Inc. Top agencies Army (Department of the Army)	$416,062	<0.1%	Rank history: not on the FY2021–FY2024 lists and #58 in FY2025; down 39 since Aug 2024–Jul 2025.
100	American Vet Works, Inc. Top agencies VA (Department of Veterans Affairs)	$397,335	<0.1%	Rank history: not on the FY2021–FY2025 lists; down 2 since Aug 2024–Jul 2025.

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100 of 431 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	$1,523,736,581	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 $1.86 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.
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 Aug 2024–Jul 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 NAICS 5622 contractors in Aug 2025–Jul 2026?

1. Hanford Tank Waste Operations & Closure, LLC ($891M), 2. Bechtel Parsons Blue Grass, A Joint Venture ($120M), 3. Bechtel Corp ($118M), 4. Inmar RX Solutions Inc. ($40.7M), 5. The Aleut Corporation ($22.4M), 6. ECC Constructors LLC ($20.4M), 7. Environmental Rail Solutions Inc. ($18M), 8. Guidehouse Inc. ($15.1M), 9. Clean Harbors Inc. ($13.5M), 10. Seaon Environmental LLC ($11.8M).

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