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

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

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

The top 10 won 67% of NAICS 5622 contract dollars from July 2025 through June 2026

Contract obligations: $1,440,118,721 Net of deobligations, by contracts coded NAICS 5622 or a code under it
Contractors: 440 Parent companies with an obligation
Largest contractor: Hanford Tank Waste Operations & Closure, LLC $841 million, 47.0% of obligations
Data as of: Oct 16, 2026

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

Full ranking

Rank	Contractor	Net obligations	Share	Trend
1	Hanford Tank Waste Operations & Closure, LLC Top agencies DOE (Department of Energy)	$841,002,959	47.0%	Rank history: not on the FY2021–FY2022 lists, #62 in FY2023, not on the FY2024 list and #1 in FY2025; unchanged since Jul 2024–Jun 2025.
2	Bechtel Parsons Blue Grass, A Joint Venture Top agencies Army (Department of the Army)	$109,599,732	6.1%	Rank history: not on the FY2021–FY2023 lists, #3 in FY2024 and #2 in FY2025; unchanged since Jul 2024–Jun 2025.
3	Bechtel Corp Through Bechtel National, Inc. Top agencies Army (Department of the Army)	$68,453,847	3.8%	Rank history: #2 in FY2021, #2 in FY2022, #1 in FY2023, #2 in FY2024 and #3 in FY2025; unchanged since Jul 2024–Jun 2025.
4	ECC Constructors LLC Top agencies Army (Department of the Army)	$64,180,528	3.6%	Rank history: not on the FY2021–FY2023 lists, #5 in FY2024 and #4 in FY2025; up 1 since Jul 2024–Jun 2025.
5	Inmar RX Solutions Inc. Top agencies HHS (Department of Health and Human Services)	$40,722,298	2.3%	Rank history: not on the FY2021–FY2024 lists and #6 in FY2025; up 290 since Jul 2024–Jun 2025.
6	Aleut Environmental Remediation, LLC Top agencies Army (Department of the Army)	$22,408,328	1.3%	Rank history: not on the FY2021–FY2024 lists and #7 in FY2025; up 209 since Jul 2024–Jun 2025.
7	Environmental Rail Solutions Inc. Top agencies Army (Department of the Army)	$18,382,861	1.0%	Rank history: #57 in FY2021, #5 in FY2022, #4 in FY2023, #7 in FY2024 and #14 in FY2025; up 12 since Jul 2024–Jun 2025.
8	Guidehouse Inc. 2 awardees, including Aptim Federal Services, LLC Top agencies Navy (Department of the Navy)	$15,401,768	0.9%	Rank history: not on the FY2021–FY2023 lists, #9 in FY2024 and #8 in FY2025; unchanged since Jul 2024–Jun 2025.
9	Clean Harbors Inc. Through Clean Harbors Environmental Services Inc. Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy) USAF (Department of the Air Force)	$13,992,866	0.8%	Rank history: #19 in FY2021, #12 in FY2022, #6 in FY2023, #8 in FY2024 and #10 in FY2025; down 2 since Jul 2024–Jun 2025.
10	Seaon Environmental LLC Top agencies Navy (Department of the Navy)	$11,980,607	0.7%	Rank history: #18 in FY2021, #11 in FY2022, #8 in FY2023, #12 in FY2024 and #9 in FY2025; down 4 since Jul 2024–Jun 2025.
11	JFL-WCS Partners LLC Through Waste Control Specialists LLC Top agencies DOE (Department of Energy) Army (Department of the Army) EPA (Environmental Protection Agency)	$11,290,270	0.6%	Rank history: not on the FY2021–FY2022 lists, #15 in FY2023, #10 in FY2024 and #22 in FY2025; down 2 since Jul 2024–Jun 2025.
12	Veolia Es Technical Solutions LLC Top agencies Army (Department of the Army) DOJ (Department of Justice) EPA (Environmental Protection Agency)	$10,590,097	0.6%	Rank history: not on the FY2021–FY2023 lists, #31 in FY2024 and #12 in FY2025; up 11 since Jul 2024–Jun 2025.
13	Willow Environmental Inc. Top agencies DLA (Defense Logistics Agency)	$9,744,393	0.5%	Rank history: #20 in FY2021, #26 in FY2022, #19 in FY2023, #22 in FY2024 and #15 in FY2025; up 2 since Jul 2024–Jun 2025.
14	Tradebe Environmental Services, LLC Top agencies DLA (Defense Logistics Agency) EPA (Environmental Protection Agency)	$9,222,985	0.5%	Rank history: not on the FY2021–FY2023 lists, #29 in FY2024 and #20 in FY2025; up 3 since Jul 2024–Jun 2025.
15	TRI-State Government Services Inc Top agencies DLA (Defense Logistics Agency)	$9,197,472	0.5%	Rank history: #15 in FY2021, #22 in FY2022, #14 in FY2023, #15 in FY2024 and #18 in FY2025; down 1 since Jul 2024–Jun 2025.
16	C & C Environmental Inc. Top agencies DLA (Defense Logistics Agency) Army (Department of the Army) DOI (Department of the Interior)	$8,914,482	0.5%	Rank history: #16 in FY2021, #13 in FY2022, #13 in FY2023, #17 in FY2024 and #13 in FY2025; down 4 since Jul 2024–Jun 2025.
17	Foreign Utility Consolidated Reporting Top agencies Army (Department of the Army)	$8,120,060	0.5%	Rank history: #11 in FY2021, #8 in FY2022, #12 in FY2023, #16 in FY2024 and #11 in FY2025; down 7 since Jul 2024–Jun 2025.
18	Industrial Waste Utilization, LLC Top agencies DLA (Defense Logistics Agency)	$7,918,748	0.4%	Rank history: #14 in FY2021, #17 in FY2022, #17 in FY2023, #19 in FY2024 and #21 in FY2025; unchanged since Jul 2024–Jun 2025.
19	Energysolutions Services, Inc. Top agencies Navy (Department of the Navy)	$7,271,406	0.4%	Rank history: not on the FY2021–FY2023 lists, #20 in FY2024 and #28 in FY2025; up 191 since Jul 2024–Jun 2025.
20	Horizon Environmental Services, Inc. Top agencies DLA (Defense Logistics Agency) DHS (Department of Homeland Security)	$7,231,996	0.4%	Rank history: #35 in FY2021, #38 in FY2022, #20 in FY2023, #11 in FY2024 and #17 in FY2025; down 7 since Jul 2024–Jun 2025.
21	Sued-Muell GMBH & Co. KG Fuer Abfalltransporte UND Sonderabfallbeseitigung Top agencies DLA (Defense Logistics Agency)	$6,959,104	0.4%	Rank history: #22 in FY2021, #25 in FY2022, #21 in FY2023, #14 in FY2024 and #19 in FY2025; down 5 since Jul 2024–Jun 2025.
22	Neie Medical Waste Services, LLC Top agencies VA (Department of Veterans Affairs) USDA (Department of Agriculture)	$6,599,328	0.4%	Rank history: #39 in FY2021, #30 in FY2022, #29 in FY2023, #44 in FY2024 and #30 in FY2025; up 12 since Jul 2024–Jun 2025.
23	Black Gold Industries Top agencies DLA (Defense Logistics Agency)	$6,392,818	0.4%	Rank history: #13 in FY2021, #18 in FY2022, #18 in FY2023, #21 in FY2024 and #23 in FY2025; up 1 since Jul 2024–Jun 2025.
24	Harsco Corporation Through AES Asset Acquisition Corporation Top agencies DLA (Defense Logistics Agency)	$5,324,862	0.3%	Rank history: not on the FY2021–FY2024 lists and #38 in FY2025; up 35 since Jul 2024–Jun 2025.
25	Republic Services Inc. 12 awardees, including Allied Waste Services of North America, LLC, Devens Recycling Center, LLC and Republic Services of North Carolina LLC Top agencies Army (Department of the Army) DOJ (Department of Justice) DOI (Department of the Interior)	$5,264,916	0.3%	Rank history: #58 in FY2021, #77 in FY2022, #77 in FY2023, #18 in FY2024 and #24 in FY2025; down 5 since Jul 2024–Jun 2025.
26	Advant-Edge Solutions of Middle Atlantic Inc. Top agencies DHA (Defense Health Agency) Treasury (Department of the Treasury) HHS (Department of Health and Human Services)	$4,796,519	0.3%	Rank history: #70 in FY2021, #23 in FY2022, #22 in FY2023, #25 in FY2024 and #25 in FY2025; down 4 since Jul 2024–Jun 2025.
27	Flightfab, Inc. Top agencies Navy (Department of the Navy)	$4,362,013	0.2%	Rank history: #79 in FY2021, #50 in FY2022, #59 in FY2023, #30 in FY2024 and #37 in FY2025; down 2 since Jul 2024–Jun 2025.
28	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 #57 in FY2025; up 1 since Jul 2024–Jun 2025.
29	Marianas Gas Corp Top agencies DLA (Defense Logistics Agency)	$3,266,308	0.2%	Rank history: not on the FY2021–FY2022 lists, #27 in FY2023, #28 in FY2024 and #31 in FY2025; up 1 since Jul 2024–Jun 2025.
30	Arcwood Environmental, LLC Top agencies Navy (Department of the Navy) DLA (Defense Logistics Agency) DOJ (Department of Justice)	$2,857,520	0.2%	Rank history: not on the FY2021–FY2023 lists, #39 in FY2024 and #27 in FY2025; down 3 since Jul 2024–Jun 2025.
31	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 #42 in FY2025; up 13 since Jul 2024–Jun 2025.
32	Lincoln Environmental Services, Inc. Top agencies USAF (Department of the Air Force)	$2,773,141	0.2%	Rank history: #80 in FY2021, #74 in FY2022, not on the FY2023 list, #71 in FY2024 and #67 in FY2025; new, not ranked in Jul 2024–Jun 2025.
33	Logex System International GMBH Top agencies DLA (Defense Logistics Agency)	$2,723,072	0.2%	Rank history: not on the FY2021–FY2023 lists, #60 in FY2024 and #34 in FY2025; up 3 since Jul 2024–Jun 2025.
34	J&T Recycling Corporation Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy)	$2,637,418	0.1%	Rank history: #26 in FY2021, #29 in FY2022, #32 in FY2023, #34 in FY2024 and #35 in FY2025; up 1 since Jul 2024–Jun 2025.
35	Meadows Cmpg, Inc. Top agencies Navy (Department of the Navy) USAF (Department of the Air Force)	$2,565,454	0.1%	Rank history: #52 in FY2021, #41 in FY2022, #52 in FY2023, #33 in FY2024 and #29 in FY2025; down 2 since Jul 2024–Jun 2025.
36	Pacific Commercial Services, Inc. Top agencies DLA (Defense Logistics Agency) DHS (Department of Homeland Security)	$2,516,505	0.1%	Rank history: #41 in FY2021, #44 in FY2022, #43 in FY2023, #26 in FY2024 and #26 in FY2025; down 15 since Jul 2024–Jun 2025.
37	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 #68 in FY2025; new, not ranked in Jul 2024–Jun 2025.
38	Earth Smart Environmental Solutions LLC Top agencies VA (Department of Veterans Affairs) USDA (Department of Agriculture)	$2,307,980	0.1%	Rank history: #67 in FY2021, #61 in FY2022, #45 in FY2023, #35 in FY2024 and #41 in FY2025; up 2 since Jul 2024–Jun 2025.
39	Advance Engineering and Construction L.L.C. Top agencies USAF (Department of the Air Force)	$2,184,479	0.1%	Rank history: not on the FY2021–FY2022 lists, #44 in FY2023, not on the FY2024 list and #43 in FY2025; up 6 since Jul 2024–Jun 2025.
40	EDM Enterprises, LLC Top agencies VA (Department of Veterans Affairs)	$2,137,209	0.1%	Rank history: #40 in FY2021, #40 in FY2022, #49 in FY2023, #41 in FY2024 and #52 in FY2025; up 35 since Jul 2024–Jun 2025.
41	GS Environmental, Inc. Top agencies DLA (Defense Logistics Agency)	$2,063,987	0.1%	Rank history: #34 in FY2021, #39 in FY2022, #69 in FY2023, #50 in FY2024 and #40 in FY2025; up 2 since Jul 2024–Jun 2025.
42	West Central Environmental Corp. Top agencies DLA (Defense Logistics Agency)	$2,020,299	0.1%	Rank history: #66 in FY2021, #59 in FY2022, #60 in FY2023, #48 in FY2024 and #56 in FY2025; up 16 since Jul 2024–Jun 2025.
43	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 #39 in FY2025; down 2 since Jul 2024–Jun 2025.
44	Tikigaq Construction, LLC Top agencies Navy (Department of the Navy)	$1,967,641	0.1%	Rank history: not on the FY2021–FY2024 lists and #33 in FY2025; up 10 since Jul 2024–Jun 2025.
45	TD Environmental Inc. Top agencies DLA (Defense Logistics Agency)	$1,903,242	0.1%	Rank history: #50 in FY2021, #73 in FY2022, #70 in FY2023, #64 in FY2024 and #63 in FY2025; up 22 since Jul 2024–Jun 2025.
46	NRC Environmental Services Inc. Top agencies DLA (Defense Logistics Agency)	$1,846,877	0.1%	Rank history: not on the FY2021–FY2023 lists, #55 in FY2024 and #36 in FY2025; down 9 since Jul 2024–Jun 2025.
47	Relife Recycling S.R.L. Top agencies DLA (Defense Logistics Agency)	$1,759,592	0.1%	Rank history: not on the FY2021–FY2022 lists, #51 in FY2023, #49 in FY2024 and #53 in FY2025; up 1 since Jul 2024–Jun 2025.
48	Shimada Shokai Co., Ltd Top agencies DLA (Defense Logistics Agency)	$1,657,458	0.1%	Rank history: #48 in FY2021, #63 in FY2022, #63 in FY2023, #66 in FY2024 and #49 in FY2025; up 4 since Jul 2024–Jun 2025.
49	Aim Consulting, LLC Top agencies DHS (Department of Homeland Security)	$1,618,348	0.1%	Rank history: not on the FY2021–FY2024 lists and #44 in FY2025; down 3 since Jul 2024–Jun 2025.
50	Jfe-K Ryukyu Logistic JV Top agencies DLA (Defense Logistics Agency)	$1,575,904	0.1%	Rank history: #45 in FY2021, #16 in FY2022, #16 in FY2023, #62 in FY2024 and #45 in FY2025; up 6 since Jul 2024–Jun 2025.
51	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 #54 in FY2025; unchanged since Jul 2024–Jun 2025.
52	Okinawaken Sangyo Haikibutsushori Cooperative Association Top agencies Navy (Department of the Navy)	$1,547,612	0.1%	Rank history: #47 in FY2021, #51 in FY2022, #55 in FY2023, #52 in FY2024 and #48 in FY2025; down 2 since Jul 2024–Jun 2025.
53	EWA Direction Inc. Top agencies VA (Department of Veterans Affairs)	$1,477,228	0.1%	Rank history: #86 in FY2021, not on the FY2022–FY2023 lists, #70 in FY2024 and #47 in FY2025; down 15 since Jul 2024–Jun 2025.
54	Guahan Waste Control, Inc. Top agencies DLA (Defense Logistics Agency)	$1,416,696	0.1%	Rank history: #63 in FY2021, #65 in FY2022, #54 in FY2023, #57 in FY2024 and #66 in FY2025; up 8 since Jul 2024–Jun 2025.
55	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 Jul 2024–Jun 2025.
56	Applied Technology, Inc. Top agencies Navy (Department of the Navy) Army (Department of the Army)	$1,236,139	0.1%	Rank history: not on the FY2021 list, #72 in FY2022, #24 in FY2023, #54 in FY2024 and #73 in FY2025; up 4 since Jul 2024–Jun 2025.
57	Tad Environment Top agencies DLA (Defense Logistics Agency)	$1,148,573	0.1%	Rank history: #65 in FY2021, #58 in FY2022, #58 in FY2023, #58 in FY2024 and #88 in FY2025; up 6 since Jul 2024–Jun 2025.
58	ECO Energy Korea Co., Ltd Top agencies DLA (Defense Logistics Agency)	$1,137,981	0.1%	Rank history: not on the FY2021–FY2024 lists and #59 in FY2025; up 3 since Jul 2024–Jun 2025.
59	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 #62 in FY2025; new, not ranked in Jul 2024–Jun 2025.
60	Stericycle Inc 2 awardees Top agencies VA (Department of Veterans Affairs) DOJ (Department of Justice) USAF (Department of the Air Force)	$988,496	0.1%	Rank history: not on the FY2021–FY2022 lists, #82 in FY2023, #79 in FY2024 and #61 in FY2025; up 6 since Jul 2024–Jun 2025.
61	Remondis Industrie Service GMBH. 2 awardees, including Refood GMBH & Co. KG Top agencies DLA (Defense Logistics Agency) Army (Department of the Army)	$978,246	0.1%	Rank history: not on the FY2021–FY2022 lists, #84 in FY2023, #59 in FY2024 and #55 in FY2025; down 12 since Jul 2024–Jun 2025.
62	Krätz GMBH Top agencies Army (Department of the Army)	$976,226	0.1%	Rank history: #53 in FY2021, #35 in FY2022, #37 in FY2023, #32 in FY2024 and #89 in FY2025; down 31 since Jul 2024–Jun 2025.
63	Onaka Gumi Co.,Ltd. Top agencies DLA (Defense Logistics Agency)	$953,156	0.1%	Rank history: #82 in FY2021, #78 in FY2022, not on the FY2023 list, #75 in FY2024 and #64 in FY2025; down 8 since Jul 2024–Jun 2025.
64	American Vet Solutions Inc. Top agencies VA (Department of Veterans Affairs) DOJ (Department of Justice)	$948,966	0.1%	Rank history: not on the FY2021–FY2024 lists and #65 in FY2025; up 1 since Jul 2024–Jun 2025.
65	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 #75 in FY2025; up 8 since Jul 2024–Jun 2025.
66	Remondis GMBH 2 awardees Top agencies Army (Department of the Army)	$911,962	0.1%	Rank history: not on the FY2021–FY2024 lists and #85 in FY2025; up 37 since Jul 2024–Jun 2025.
67	Veolia ES (UK) Limited Top agencies DLA (Defense Logistics Agency)	$891,913	<0.1%	Rank history: not on the FY2021–FY2024 lists and #79 in FY2025; up 15 since Jul 2024–Jun 2025.
68	Clean Earth Systems, Inc. Top agencies DLA (Defense Logistics Agency)	$862,681	<0.1%	Rank history: #51 in FY2021, #46 in FY2022, #42 in FY2023, #38 in FY2024 and #46 in FY2025; down 26 since Jul 2024–Jun 2025.
69	Kankyo Solution Co.,Ltd Top agencies Navy (Department of the Navy)	$847,776	<0.1%	Rank history: not on the FY2021–FY2024 lists and #70 in FY2025; down 5 since Jul 2024–Jun 2025.
70	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 #69 in FY2025; up 62 since Jul 2024–Jun 2025.
71	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 #77 in FY2025; down 1 since Jul 2024–Jun 2025.
72	Mediwaste Disposal, LLC Top agencies VA (Department of Veterans Affairs)	$720,000	<0.1%	Rank history: not on the FY2021–FY2025 lists; up 124 since Jul 2024–Jun 2025.
73	Waste Management Collection and Recycling Inc 15 awardees, including Waste Management of Texas, Inc., Atlantic Waste Disposal, Inc. and King George Landfill, Inc. Top agencies DOJ (Department of Justice) Army (Department of the Army) VA (Department of Veterans Affairs)	$705,394	<0.1%	Rank history: not on the FY2021–FY2025 lists; up 19 since Jul 2024–Jun 2025.
74	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 #78 in FY2025; up 7 since Jul 2024–Jun 2025.
75	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 #80 in FY2025; up 3 since Jul 2024–Jun 2025.
76	Lewis Environmental LLC Top agencies USDA (Department of Agriculture)	$676,060	<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 192 since Jul 2024–Jun 2025.
77	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 #90 in FY2025; up 12 since Jul 2024–Jun 2025.
78	Pacific Coast Contracting Group Top agencies VA (Department of Veterans Affairs)	$645,367	<0.1%	Rank history: not on the FY2021–FY2024 lists and #76 in FY2025; up 110 since Jul 2024–Jun 2025.
79	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 Jul 2024–Jun 2025.
80	Essinem LLC Top agencies USDA (Department of Agriculture)	$637,512	<0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
81	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 #81 in FY2025; up 2 since Jul 2024–Jun 2025.
82	Nambu Service Co., Ltd. Top agencies Army (Department of the Army)	$624,119	<0.1%	Rank history: not on the FY2021 list, #99 in FY2022, #68 in FY2023, #94 in FY2024 and #71 in FY2025; down 10 since Jul 2024–Jun 2025.
83	Up-Side Management Co Top agencies Army (Department of the Army)	$612,855	<0.1%	Rank history: not on the FY2021–FY2023 lists, #76 in FY2024 and #93 in FY2025; down 12 since Jul 2024–Jun 2025.
84	Advetage Solutions LLC Top agencies Army (Department of the Army)	$589,565	<0.1%	Rank history: not on the FY2021–FY2024 lists and #83 in FY2025; up 179 since Jul 2024–Jun 2025.
85	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 Jul 2024–Jun 2025.
86	County of Mariposa Top agencies DOI (Department of the Interior)	$553,260	<0.1%	Rank history: not on the FY2021–FY2025 lists; up 61 since Jul 2024–Jun 2025.
87	Koman Government Solutions LLC Top agencies Navy (Department of the Navy)	$543,020	<0.1%	Rank history: not on the FY2021–FY2024 lists and #96 in FY2025; up 7 since Jul 2024–Jun 2025.
88	Terrabella Environmental Services Inc. Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy) DHS (Department of Homeland Security)	$489,857	<0.1%	Rank history: not on the FY2021–FY2025 lists; up 70 since Jul 2024–Jun 2025.
89	Whitewater Environmental LLC Top agencies USAF (Department of the Air Force)	$477,096	<0.1%	Rank history: not on the FY2021–FY2024 lists and #99 in FY2025; up 8 since Jul 2024–Jun 2025.
90	Reworld Solutions, LLC Top agencies DOJ (Department of Justice) HHS (Department of Health and Human Services) Treasury (Department of the Treasury)	$476,239	<0.1%	Rank history: not on the FY2021–FY2025 lists; up 40 since Jul 2024–Jun 2025.
91	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 31 since Jul 2024–Jun 2025.
92	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 #95 in FY2025; up 1 since Jul 2024–Jun 2025.
93	Horizon Environmental Solutions Corporation Top agencies DLA (Defense Logistics Agency)	$458,669	<0.1%	Rank history: #97 in FY2021, #91 in FY2022, #36 in FY2023, #74 in FY2024 and #91 in FY2025; down 16 since Jul 2024–Jun 2025.
94	Daniels Sharpsmart, Inc. Top agencies VA (Department of Veterans Affairs)	$449,340	<0.1%	Rank history: not on the FY2021–FY2024 lists and #94 in FY2025; new, not ranked in Jul 2024–Jun 2025.
95	Energysolutions, LLC Top agencies Navy (Department of the Navy) DOE (Department of Energy)	$440,667	<0.1%	Rank history: not on the FY2021–FY2024 lists and #16 in FY2025; down 84 since Jul 2024–Jun 2025.
96	August Mack Environmental, Inc. Top agencies Army (Department of the Army)	$416,062	<0.1%	Rank history: not on the FY2021–FY2024 lists and #60 in FY2025; down 39 since Jul 2024–Jun 2025.
97	Hosan Environment Co., Ltd. Top agencies Army (Department of the Army)	$415,861	<0.1%	Rank history: not on the FY2021–FY2022 lists, #92 in FY2023, #93 in FY2024 and not on the FY2025 list; up 3 since Jul 2024–Jun 2025.
98	American Vet Works, Inc. Top agencies VA (Department of Veterans Affairs)	$397,335	<0.1%	Rank history: not on the FY2021–FY2025 lists; up 1 since Jul 2024–Jun 2025.
99	Schrass GMBH Top agencies Army (Department of the Army)	$389,960	<0.1%	Rank history: not on the FY2021–FY2025 lists; up 2 since Jul 2024–Jun 2025.
100	Hamilton Alliance Inc. Top agencies VA (Department of Veterans Affairs) DOJ (Department of Justice)	$378,165	<0.1%	Rank history: not on the FY2021 list, #100 in FY2022, #87 in FY2023, #92 in FY2024 and #58 in FY2025; down 47 since Jul 2024–Jun 2025.

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100 of 440 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	$1,440,118,721	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 $1.79 billion obligated before deobligations, so they never pass 100%.
Parent companies: each action counts under the ultimate parent its award record names, or under the awardee when it names none, so no dollar counts twice. Parents of the same name (Inc., LLC and the like aside) count as one company, since FPDS records a company's parent under more than one UEI over time. GovTribe corrects a few parents and names by hand; see the corrections.
Period: the trailing 12 months end with the last month that ended at least 90 days ago, because the Department of Defense reports its contract actions to FPDS about 90 days late. The list is rebuilt each night.
Rank changes compare with Jul 2024–Jun 2025. "New" marks a company outside that period's top 500, and "Returned" one of those that was on an earlier fiscal year's list.
Rank lines show each company's rank on every fiscal year's list since FY2021, #1 at the top, on a scale that gives the top of the list more room. A dashed stretch spans years it wasn't on the list.
Placeholder recipients FPDS uses when it names no company ("Miscellaneous Foreign Contractors" and the like) aren't ranked.

Quick answers

Who were the top 10 NAICS 5622 contractors in Jul 2025–Jun 2026?

1. Hanford Tank Waste Operations & Closure, LLC ($841M), 2. Bechtel Parsons Blue Grass, A Joint Venture ($110M), 3. Bechtel Corp ($68.5M), 4. ECC Constructors LLC ($64.2M), 5. Inmar RX Solutions Inc. ($40.7M), 6. Aleut Environmental Remediation, LLC ($22.4M), 7. Environmental Rail Solutions Inc. ($18.4M), 8. Guidehouse Inc. ($15.4M), 9. Clean Harbors Inc. ($14M), 10. Seaon Environmental LLC ($12M).

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