Top 100 Contractors in NAICS 5629: Remediation and Other Waste Management Services, FY2021

Name: Top 100 Contractors in NAICS 5629: Remediation and Other Waste Management Services, FY2021
Creator: GovTribe

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

The top 10 won 52% of FY2021 NAICS 5629 contract dollars

Contract obligations: $4,586,998,641 Net of deobligations, by contracts coded NAICS 5629 or a code under it
Contractors: 1,710 Parent companies with an obligation
Largest contractor: Fluor Corporation $781 million, 16.0% 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	Fluor Corporation 2 awardees, including Fluor Idaho LLC and Fluor-Bwxt Portsmouth LLC Top agencies DOE (Department of Energy)	$780,721,084	16.0%	Rank history: #3 in FY2022, #4 in FY2023, #3 in FY2024 and #3 in FY2025; up 1 since FY2020.
2	AECOM 13 awardees, including Ucor LLC, AECOM Technical Services, Inc. and URS Group, Inc. Top agencies DOE (Department of Energy) Army (Department of the Army) EPA (Environmental Protection Agency)	$477,675,108	9.8%	Rank history: #4 in FY2022, #9 in FY2023, #65 in FY2024 and not on the FY2025 list; up 1 since FY2020.
3	Amentum Services, Inc. Through Central Plateau Cleanup Company, LLC Top agencies DOE (Department of Energy) Navy (Department of the Navy)	$440,197,896	9.0%	Rank history: #2 in FY2022, #3 in FY2023, #4 in FY2024 and not on the FY2025 list; up 130 since FY2020.
4	Jacobs Engineering Group Inc. 10 awardees, including Ch2M Hill Plateau Remediation Company, Amentum Technology, Inc. and Ch2M Hill, Inc. Top agencies DOE (Department of Energy) Army (Department of the Army) EPA (Environmental Protection Agency)	$162,921,550	3.3%	Rank history: #28 in FY2022, #5 in FY2023, #6 in FY2024 and not on the FY2025 list; down 3 since FY2020.
5	Hydrogeologic, Inc. Top agencies Army (Department of the Army) EPA (Environmental Protection Agency) USAF (Department of the Air Force)	$159,745,412	3.3%	Rank history: #7 in FY2022, #7 in FY2023, #9 in FY2024 and #7 in FY2025; up 2 since FY2020.
6	Cook Inlet Region Inc. 10 awardees, including North Wind Portage, Inc., North Wind Construction Services, LLC and North Wind, Inc. Top agencies Army (Department of the Army) DOE (Department of Energy) DOI (Department of the Interior)	$137,283,041	2.8%	Rank history: #15 in FY2022, #24 in FY2023, #28 in FY2024 and not on the FY2025 list; up 6 since FY2020.
7	EA Engineering, Science, and Technology, Inc., PBC 2 awardees Top agencies EPA (Environmental Protection Agency) Army (Department of the Army) USAF (Department of the Air Force)	$124,184,120	2.5%	Rank history: #5 in FY2022, #6 in FY2023, #8 in FY2024 and #10 in FY2025; up 1 since FY2020.
8	Ch2M Hill Bwxt West Valley, LLC Top agencies DOE (Department of Energy)	$89,609,295	1.8%	Rank history: #11 in FY2022, #14 in FY2023, #34 in FY2024 and not on the FY2025 list; up 3 since FY2020.
9	Environmental Restoration LLC Top agencies EPA (Environmental Protection Agency) USAF (Department of the Air Force) DOJ (Department of Justice)	$83,284,969	1.7%	Rank history: #6 in FY2022, #11 in FY2023, #21 in FY2024 and #11 in FY2025; up 5 since FY2020.
10	Navarro Research and Engineering, Inc. Top agencies DOE (Department of Energy) Army (Department of the Army) USAF (Department of the Air Force)	$75,554,914	1.6%	Rank history: #16 in FY2022, #21 in FY2023, #20 in FY2024 and #17 in FY2025; down 1 since FY2020.
11	Cape Environmental Management Inc. 4 awardees Top agencies Navy (Department of the Navy) USAF (Department of the Air Force) Army (Department of the Army)	$67,732,982	1.4%	Rank history: #14 in FY2022, #38 in FY2023, #46 in FY2024 and #28 in FY2025; up 5 since FY2020.
12	Tetra Tech, Inc. 12 awardees, including Tetra TECH EC, Inc. Top agencies DOS (Department of State) Army (Department of the Army) USAF (Department of the Air Force)	$66,771,226	1.4%	Rank history: #8 in FY2022, #8 in FY2023, #19 in FY2024 and #12 in FY2025; down 2 since FY2020.
13	RSI Entech, LLC Top agencies DOE (Department of Energy)	$63,990,610	1.3%	Rank history: #9 in FY2022, #12 in FY2023, #14 in FY2024 and not on the FY2025 list; up 87 since FY2020.
14	Sevenson Environmental Services, Inc. Top agencies EPA (Environmental Protection Agency) Army (Department of the Army) Navy (Department of the Navy)	$60,825,094	1.2%	Rank history: #10 in FY2022, #13 in FY2023, #5 in FY2024 and #6 in FY2025; down 1 since FY2020.
15	Weston - Er Federal Services, LLC Top agencies USAF (Department of the Air Force)	$56,813,893	1.2%	Rank history: #34 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
16	Fluor-Bwxt Portsmouth LLC Top agencies DOE (Department of Energy)	$50,963,000	1.0%	Rank history: #26 in FY2022 and not on the FY2023–FY2025 lists; down 11 since FY2020.
17	The Source Group, Inc. Top agencies DLA (Defense Logistics Agency)	$40,911,297	0.8%	Rank history: #41 in FY2022, not on the FY2023 list, #90 in FY2024 and #63 in FY2025; up 26 since FY2020.
18	Nuclear Ship Support Services LLC Top agencies DOT (Department of Transportation)	$39,856,992	0.8%	Rank history: #56 in FY2022, not on the FY2023–FY2024 lists and #82 in FY2025; new, not ranked in FY2020.
19	Oneida Nation 5 awardees, including Oneida Total Integrated Enterprises LLC and Sustainment & Restoration Services, LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force) DMA (Defense Media Activity)	$38,603,645	0.8%	Rank history: #17 in FY2022, #22 in FY2023, #69 in FY2024 and not on the FY2025 list; down 4 since FY2020.
20	Environmental Chemical Corporation 3 awardees, including ECC Insight Philotechnics LLC and ECC Insight LLC Top agencies Army (Department of the Army) Navy (Department of the Navy) USAF (Department of the Air Force)	$38,465,262	0.8%	Rank history: #29 in FY2022, #27 in FY2023, #24 in FY2024 and #24 in FY2025; up 13 since FY2020.
21	Hanford Laboratory Management and Integration LLC Top agencies DOE (Department of Energy)	$37,946,839	0.8%	Rank history: #13 in FY2022, #15 in FY2023, #10 in FY2024 and #13 in FY2025; up 184 since FY2020.
22	Aerostar SES LLC 2 awardees Top agencies USAF (Department of the Air Force) Army (Department of the Army) Navy (Department of the Navy)	$37,160,322	0.8%	Rank history: #100 in FY2022, #32 in FY2023 and not on the FY2024–FY2025 lists; up 2 since FY2020.
23	Brice-Aecom JV1 Top agencies USAF (Department of the Air Force) Army (Department of the Army)	$30,797,283	0.6%	Rank history: #78 in FY2022, #59 in FY2023 and not on the FY2024–FY2025 lists; up 105 since FY2020.
24	Arctic Slope Regional Corporation 2 awardees, including Environmental Quality Management, Inc. and EQM Services, LLC Top agencies EPA (Environmental Protection Agency) Army (Department of the Army)	$30,333,384	0.6%	Rank history: #42 in FY2022, #16 in FY2023, #53 in FY2024 and #4 in FY2025; up 28 since FY2020.
25	Tikigaq Corporation Through Agviq LLC Top agencies Navy (Department of the Navy)	$29,134,352	0.6%	Rank history: #39 in FY2022, #85 in FY2023 and not on the FY2024–FY2025 lists; up 29 since FY2020.
26	Aptim AECOM Decommissioning, LLC Top agencies Army (Department of the Army)	$28,844,304	0.6%	Rank history: not on the FY2022 list, #26 in FY2023 and not on the FY2024–FY2025 lists; down 8 since FY2020.
27	Kemron Environmental Services, Inc. Top agencies EPA (Environmental Protection Agency) Army (Department of the Army) Navy (Department of the Navy)	$27,944,053	0.6%	Rank history: #32 in FY2022, #39 in FY2023 and not on the FY2024–FY2025 lists; up 1 since FY2020.
28	Bristol Environmental Solutions LLC Top agencies Army (Department of the Army) DOI (Department of the Interior)	$27,212,173	0.6%	Rank history: #97 in FY2022 and not on the FY2023–FY2025 lists; down 8 since FY2020.
29	Bay West-Ahtna Joint Venture, LLC Top agencies Army (Department of the Army)	$26,566,166	0.5%	Rank history: #72 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
30	Ahtna, Incorporated 3 awardees, including Ahtna Global LLC, Ahtna Environmental, Inc. and Ahtna Facility Services, Incorporated Top agencies Army (Department of the Army) DOT (Department of Transportation) DOE (Department of Energy)	$26,239,389	0.5%	Rank history: #40 in FY2022, #44 in FY2023 and not on the FY2024–FY2025 lists; down 9 since FY2020.
31	Aptim Federal Services LLC 2 awardees Top agencies Army (Department of the Army) Navy (Department of the Navy) EPA (Environmental Protection Agency)	$25,649,762	0.5%	Rank history: #20 in FY2022, #10 in FY2023 and not on the FY2024–FY2025 lists; down 14 since FY2020.
32	Camp Dresser & Mckee Inc. 3 awardees, including CDM Federal Programs Corporation Top agencies EPA (Environmental Protection Agency)	$25,235,166	0.5%	Rank history: #19 in FY2022 and not on the FY2023–FY2025 lists; down 2 since FY2020.
33	Sevenson-Usa Environmental Joint Venture Top agencies Army (Department of the Army)	$22,004,737	0.5%	Rank history: #84 in FY2022 and not on the FY2023–FY2025 lists; up 5 since FY2020.
34	Olgoonik Corporation 3 awardees, including FPM Remediations, Inc. Top agencies Army (Department of the Army) USAF (Department of the Air Force) Navy (Department of the Navy)	$21,096,055	0.4%	Rank history: #86 in FY2022, #57 in FY2023, #51 in FY2024 and #39 in FY2025; up 54 since FY2020.
35	Bhate Zapata, LLC Top agencies Army (Department of the Army) DLA (Defense Logistics Agency)	$20,539,218	0.4%	Rank history: #99 in FY2022, #79 in FY2023 and not on the FY2024–FY2025 lists; up 10 since FY2020.
36	Hgl-Aptim JV LLC Top agencies DLA (Defense Logistics Agency) Army (Department of the Army) EPA (Environmental Protection Agency)	$19,681,747	0.4%	Rank history: #31 in FY2022, #50 in FY2023, #32 in FY2024 and #37 in FY2025; up 29 since FY2020.
37	Guardian Environmental Services Co Inc. Top agencies EPA (Environmental Protection Agency)	$19,674,091	0.4%	Rank history: not on the FY2022–FY2025 lists; up 48 since FY2020.
38	Enterprise Technical Assistance Services Inc. Top agencies DOE (Department of Energy)	$19,628,505	0.4%	Rank history: #35 in FY2022, #36 in FY2023, #36 in FY2024 and #60 in FY2025; down 2 since FY2020.
39	Brice Engineering, LLC Top agencies Army (Department of the Army) DHS (Department of Homeland Security)	$19,198,691	0.4%	Rank history: #22 in FY2022, #18 in FY2023, #43 in FY2024 and #32 in FY2025; up 18 since FY2020.
40	Itsi Gilbane Japan G.K. 2 awardees, including Gilbane Federal and Ges-Aecom JV Top agencies Navy (Department of the Navy) EPA (Environmental Protection Agency)	$18,594,309	0.4%	Rank history: #49 in FY2022 and not on the FY2023–FY2025 lists; up 39 since FY2020.
41	Ayuda MC2 JV LLC Top agencies EPA (Environmental Protection Agency)	$17,894,268	0.4%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
42	Calista Corp 2 awardees, including Brice Environmental Services Corporation Top agencies Army (Department of the Army) DOT (Department of Transportation) USAF (Department of the Air Force)	$17,756,463	0.4%	Rank history: #47 in FY2022, #89 in FY2023, #94 in FY2024 and not on the FY2025 list; down 19 since FY2020.
43	Tli-Bay West Joint Venture, LLC Top agencies Army (Department of the Army)	$17,265,863	0.4%	Rank history: not on the FY2022–FY2025 lists; up 119 since FY2020.
44	Wood Environment & Infrastructure Solutions Inc. 3 awardees, including Wood Programs Inc., WSP E&Is GMBH and WSP USA Environment & Infrastructure Inc. Top agencies USAF (Department of the Air Force) Army (Department of the Army) Navy (Department of the Navy)	$16,859,161	0.3%	Rank history: not on the FY2022–FY2025 lists; up 16 since FY2020.
45	Cabrera Services Inc. Top agencies Army (Department of the Army) EPA (Environmental Protection Agency)	$16,498,803	0.3%	Rank history: #24 in FY2022 and not on the FY2023–FY2025 lists; down 14 since FY2020.
46	USA Environmental, Inc. Top agencies Navy (Department of the Navy) USAF (Department of the Air Force) DFAS (Defense Finance and Accounting Service)	$15,048,244	0.3%	Rank history: #52 in FY2022, #53 in FY2023, #60 in FY2024 and #43 in FY2025; down 19 since FY2020.
47	Paragon Professional Services LLC Top agencies DOE (Department of Energy) Army (Department of the Army)	$13,758,654	0.3%	Rank history: #64 in FY2022, #33 in FY2023, #31 in FY2024 and #19 in FY2025; up 55 since FY2020.
48	Natives of Kodiak, Incorporated 4 awardees, including Koman Government Solutions LLC, Environmental Assessment Services, LLC and Trinity Analysis and Development Corp. Top agencies Army (Department of the Army) Navy (Department of the Navy) USAF (Department of the Air Force)	$13,296,311	0.3%	Rank history: #51 in FY2022, #55 in FY2023 and not on the FY2024–FY2025 lists; down 8 since FY2020.
49	Mmg-Tli JV, LLC Top agencies USAF (Department of the Air Force) Army (Department of the Army)	$12,949,712	0.3%	Rank history: not on the FY2022–FY2025 lists; up 83 since FY2020.
50	Tanaq-Ecm-8A JV Top agencies Army (Department of the Army) Navy (Department of the Navy)	$12,823,917	0.3%	Rank history: not on the FY2022–FY2025 lists; up 269 since FY2020.
51	Parsons Corporation Through Parsons Government Services Inc. Top agencies Army (Department of the Army)	$12,694,186	0.3%	Rank history: #21 in FY2022, #46 in FY2023, #59 in FY2024 and #30 in FY2025; up 8 since FY2020.
52	Leidos Holdings, Inc. 2 awardees, including Leidos, Inc. Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$11,991,534	0.2%	Rank history: #55 in FY2022, #67 in FY2023, #97 in FY2024 and #45 in FY2025; up 10 since FY2020.
53	EQ & CH Remediation Top agencies EPA (Environmental Protection Agency)	$11,277,327	0.2%	Rank history: #68 in FY2022, #72 in FY2023, #35 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
54	Nobis Engineering, Inc. 2 awardees Top agencies EPA (Environmental Protection Agency) Army (Department of the Army)	$11,098,002	0.2%	Rank history: #53 in FY2022, not on the FY2023 list, #49 in FY2024 and not on the FY2025 list; up 62 since FY2020.
55	Ea-Wood-1 MP JV Top agencies Navy (Department of the Navy)	$10,913,108	0.2%	Rank history: not on the FY2022 list, #45 in FY2023 and not on the FY2024–FY2025 lists; up 26 since FY2020.
56	C M C, Inc. Top agencies EPA (Environmental Protection Agency)	$10,755,863	0.2%	Rank history: #30 in FY2022, #28 in FY2023, #38 in FY2024 and #86 in FY2025; down 27 since FY2020.
57	Hdr, Inc. 3 awardees, including HDR Aptim LLC, HDR Environmental, Operations and Construction, Inc. and Henningson, Durham & Richardson, P.C Top agencies EPA (Environmental Protection Agency) DLA (Defense Logistics Agency)	$10,638,830	0.2%	Rank history: #46 in FY2022, #56 in FY2023 and not on the FY2024–FY2025 lists; up 39 since FY2020.
58	Ayuda Arcadis 8A Joint Venture LLC Top agencies Army (Department of the Army)	$10,356,629	0.2%	Rank history: not on the FY2022–FY2023 lists, #99 in FY2024 and not on the FY2025 list; up 87 since FY2020.
59	Leisnoi Diversified Services, LLC Top agencies EPA (Environmental Protection Agency)	$10,035,316	0.2%	Rank history: #58 in FY2022, #84 in FY2023, #57 in FY2024 and #74 in FY2025; up 387 since FY2020.
60	Arcadis N.V. 2 awardees, including Arcadis U.s., Inc. and Arcadis Consulting (Uk) Limited Top agencies USAF (Department of the Air Force) Army (Department of the Army) Navy (Department of the Navy)	$9,884,797	0.2%	Rank history: not on the FY2022–FY2025 lists; down 35 since FY2020.
61	Four Rivers Nuclear Partnership LLC Top agencies DOE (Department of Energy)	$9,798,104	0.2%	Rank history: #62 in FY2022, #47 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
62	Leisnoi-Kemron 8A JV, LLC Top agencies Navy (Department of the Navy)	$9,769,041	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
63	Bhate Environmental Associates, Inc. Top agencies USAF (Department of the Air Force) Army (Department of the Army) Commerce (Department of Commerce)	$9,703,602	0.2%	Rank history: #50 in FY2022, #92 in FY2023, not on the FY2024 list and #96 in FY2025; down 5 since FY2020.
64	Ie-Weston Federal Services JVB LLC Top agencies Army (Department of the Army)	$9,302,904	0.2%	Rank history: #91 in FY2022 and not on the FY2023–FY2025 lists; up 18 since FY2020.
65	Professional Project Services, Inc. Top agencies DOE (Department of Energy)	$9,117,674	0.2%	Rank history: #63 in FY2022, not on the FY2023 list, #77 in FY2024 and #84 in FY2025; down 1 since FY2020.
66	Advanced Technologies and Laboratories (Atl) International, Inc. Top agencies HHS (Department of Health and Human Services) SSA (Social Security Administration)	$9,037,970	0.2%	Rank history: not on the FY2022–FY2023 lists, #66 in FY2024 and not on the FY2025 list; up 258 since FY2020.
67	AECOM Technical Services, Inc. Top agencies Army (Department of the Army)	$8,933,759	0.2%	Rank history: not on the FY2022–FY2023 lists, #13 in FY2024 and #18 in FY2025; up 195 since FY2020.
68	Ayuda-Plexus Joint Venture LLC Top agencies Army (Department of the Army)	$8,866,702	0.2%	Rank history: #83 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
69	Bay West LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force) DOJ (Department of Justice)	$8,853,788	0.2%	Rank history: #70 in FY2022, #48 in FY2023, #55 in FY2024 and #38 in FY2025; down 30 since FY2020.
70	Ea-Wood-2 MP JV Top agencies Army (Department of the Army)	$8,587,052	0.2%	Rank history: not on the FY2022–FY2025 lists; up 125 since FY2020.
71	Seres-Arcadis SB JV, LLC Top agencies Army (Department of the Army)	$8,395,863	0.2%	Rank history: #80 in FY2022, #70 in FY2023, #62 in FY2024 and not on the FY2025 list; down 30 since FY2020.
72	ST George Tanaq Corp 3 awardees, including Tanaq Environmental LLC, Heliotech and Helios Resources, Ltd Top agencies Army (Department of the Army) EPA (Environmental Protection Agency) USAF (Department of the Air Force)	$8,225,480	0.2%	Rank history: #76 in FY2022, #65 in FY2023 and not on the FY2024–FY2025 lists; down 24 since FY2020.
73	Resolve Marine Group Inc. Top agencies DHS (Department of Homeland Security)	$8,123,380	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
74	Wastren, Inc. Through VNS Federal Services LLC Top agencies DOE (Department of Energy)	$8,010,068	0.2%	Rank history: not on the FY2022–FY2025 lists; up 20 since FY2020.
75	A and M Engineering & Environmental Services, Inc. Top agencies EPA (Environmental Protection Agency)	$7,929,157	0.2%	Rank history: #85 in FY2022, not on the FY2023 list, #88 in FY2024 and #79 in FY2025; up 71 since FY2020.
76	Kemron / Arrowhead JV, LLC Top agencies EPA (Environmental Protection Agency)	$7,735,868	0.2%	Rank history: #36 in FY2022, #29 in FY2023 and not on the FY2024–FY2025 lists; up 16 since FY2020.
77	Pika International, Inc. Top agencies Army (Department of the Army)	$7,621,218	0.2%	Rank history: #45 in FY2022 and not on the FY2023–FY2025 lists; up 71 since FY2020.
78	Seres Engineering & Services LLC 2 awardees, including Seres-Arcadis 8(A) JV2 LLC Top agencies Army (Department of the Army) Navy (Department of the Navy) USAF (Department of the Air Force)	$7,472,354	0.2%	Rank history: #25 in FY2022 and not on the FY2023–FY2025 lists; down 28 since FY2020.
79	Alaska Peninsula Corporation Through Talarik Research and Restoration Services LLC Top agencies USAF (Department of the Air Force)	$7,387,972	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
80	Asl-Mmg Joint Venture LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$7,279,820	0.1%	Rank history: not on the FY2022–FY2025 lists; up 26 since FY2020.
81	SES Civil and Environmental LLC Top agencies USAF (Department of the Air Force) HHS (Department of Health and Human Services) Navy (Department of the Navy)	$7,257,801	0.1%	Rank history: #77 in FY2022, #69 in FY2023 and not on the FY2024–FY2025 lists; down 44 since FY2020.
82	Confederated Salish and Kootenai Tribes Through S & K Logistics Services LLC Top agencies DOE (Department of Energy)	$7,236,808	0.1%	Rank history: not on the FY2022 list, #75 in FY2023 and not on the FY2024–FY2025 lists; up 74 since FY2020.
83	Weston Solutions Holdings, Inc. Through Weston Solutions Inc. Top agencies Army (Department of the Army)	$7,207,502	0.1%	Rank history: #67 in FY2022, not on the FY2023 list, #52 in FY2024 and not on the FY2025 list; down 64 since FY2020.
84	CES Insight LLC Top agencies USAF (Department of the Air Force) DOT (Department of Transportation)	$7,128,599	0.1%	Rank history: #88 in FY2022 and not on the FY2023–FY2025 lists; up 100 since FY2020.
85	Global Diving & Salvage, Inc. Top agencies DHS (Department of Homeland Security)	$7,072,725	0.1%	Rank history: #43 in FY2022, not on the FY2023 list, #85 in FY2024 and not on the FY2025 list; up 52 since FY2020.
86	Meps GMBH Military Effective Projects & Services 2 awardees, including Meps GMBH and TOI TOI & Dixi Sanitaersysteme GMBH Top agencies USAF (Department of the Air Force) Army (Department of the Army)	$7,042,650	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
87	Environmental Compliance Consultants, Inc. Top agencies Army (Department of the Army) DOI (Department of the Interior)	$6,740,075	0.1%	Rank history: #75 in FY2022 and not on the FY2023–FY2025 lists; up 12 since FY2020.
88	Alpha Facilities Solutions, LLC Top agencies DODEA (Department of Defense Education Activity) Army (Department of the Army)	$6,669,347	0.1%	Rank history: not on the FY2022–FY2025 lists; up 5 since FY2020.
89	The Chenega Corporation 4 awardees, including Chenega Healthcare Services LLC, Chenega Tri-Services, LLC and Chenega Facilities Management LLC Top agencies USAF (Department of the Air Force) Army (Department of the Army)	$6,627,340	0.1%	Rank history: #74 in FY2022 and not on the FY2023–FY2025 lists; down 23 since FY2020.
90	R8I Cabrera Remediation and Construction \"Llc\" Top agencies Army (Department of the Army)	$6,626,180	0.1%	Rank history: not on the FY2022–FY2025 lists; down 29 since FY2020.
91	Huntington Ingalls Industries, Inc. 2 awardees, including Newport News Nuclear Bwxt-Los Alamos LLC Top agencies DOE (Department of Energy)	$6,473,930	0.1%	Rank history: #71 in FY2022, #82 in FY2023, not on the FY2024 list and #81 in FY2025; down 8 since FY2020.
92	Credere Associates, LLC Top agencies Army (Department of the Army) DHS (Department of Homeland Security)	$6,353,537	0.1%	Rank history: not on the FY2022–FY2025 lists; up 252 since FY2020.
93	Susitna Environmental, LLC Top agencies Army (Department of the Army) DOT (Department of Transportation)	$5,873,580	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
94	Meadows Cmpg, Inc. Top agencies Navy (Department of the Navy)	$5,765,536	0.1%	Rank history: not on the FY2022–FY2025 lists; up 17 since FY2020.
95	Kfs, LLC Top agencies Army (Department of the Army)	$5,610,799	0.1%	Rank history: not on the FY2022–FY2025 lists; up 36 since FY2020.
96	The Aleut Corporation 4 awardees, including Aleut Remediation LLC and Aleut Construction LLC Top agencies Army (Department of the Army) DOI (Department of the Interior) DOE (Department of Energy)	$5,477,630	0.1%	Rank history: not on the FY2022 list, #97 in FY2023 and not on the FY2024–FY2025 lists; up 164 since FY2020.
97	Bers-Weston Services Jvc, LLC Top agencies Navy (Department of the Navy)	$5,476,281	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
98	Itms, Inc. Top agencies Navy (Department of the Navy)	$5,455,321	0.1%	Rank history: not on the FY2022–FY2025 lists; down 14 since FY2020.
99	Paragon-Jacobs Joint Venture, LLC Top agencies Army (Department of the Army)	$5,335,919	0.1%	Rank history: #87 in FY2022 and not on the FY2023–FY2025 lists; up 5 since FY2020.
100	Engineering / Remediation Resources Group, Inc. 4 awardees Top agencies Navy (Department of the Navy) USDA (Department of Agriculture) Army (Department of the Army)	$5,129,221	0.1%	Rank history: #37 in FY2022, #60 in FY2023 and not on the FY2024–FY2025 lists; down 66 since FY2020.

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100 of 1,710 contractors listed here. See the rest on GovTribe.

Rankings for the codes under NAICS 5629

Code	Net obligations	Largest contractor
56291 Remediation Services	$4,477,192,245	Fluor Corporation
56299 All Other Waste Management Services	$104,059,294	Meps GMBH Military Effective Projects & Services
56292 Materials Recovery Facilities	$5,747,102	Auris Noble 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 $4.87 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 5629 contractors in FY2021?

1. Fluor Corporation ($781M), 2. AECOM ($478M), 3. Amentum Services, Inc. ($440M), 4. Jacobs Engineering Group Inc. ($163M), 5. Hydrogeologic, Inc. ($160M), 6. Cook Inlet Region Inc. ($137M), 7. EA Engineering, Science, and Technology, Inc., PBC ($124M), 8. Ch2M Hill Bwxt West Valley, LLC ($89.6M), 9. Environmental Restoration LLC ($83.3M), 10. Navarro Research and Engineering, Inc. ($75.6M).

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