Top 100 Contractors in NAICS 5629: Remediation and Other Waste Management Services, FY2024

Name: Top 100 Contractors in NAICS 5629: Remediation and Other Waste Management Services, FY2024
Creator: GovTribe

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

The top 10 won 52% of FY2024 NAICS 5629 contract dollars

Contract obligations: $7,528,410,435 Net of deobligations, by contracts coded NAICS 5629 or a code under it
Contractors: 1,789 Parent companies with an obligation
Largest contractor: Savannah River Mission Completion, LLC $886 million, 11.3% 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	Savannah River Mission Completion, LLC Top agencies DOE (Department of Energy)	$885,649,780	11.3%	Rank history: not on the FY2021 list, #1 in FY2022, #1 in FY2023 and #2 in FY2025; unchanged since FY2023.
2	United Cleanup Oak Ridge LLC Top agencies DOE (Department of Energy)	$592,276,416	7.5%	Rank history: not on the FY2021–FY2022 lists, #2 in FY2023 and #8 in FY2025; unchanged since FY2023.
3	Fluor Corporation Through Fluor-Bwxt Portsmouth LLC Top agencies DOE (Department of Energy)	$511,503,345	6.5%	Rank history: #1 in FY2021, #3 in FY2022, #4 in FY2023 and #3 in FY2025; up 1 since FY2023.
4	Amentum Services, Inc. 3 awardees, including Central Plateau Cleanup Company, LLC and Amentum Environment & Energy, Inc. Top agencies DOE (Department of Energy) DOT (Department of Transportation) Navy (Department of the Navy)	$488,689,083	6.2%	Rank history: #3 in FY2021, #2 in FY2022, #3 in FY2023 and not on the FY2025 list; down 1 since FY2023.
5	Sevenson Environmental Services, Inc. Top agencies EPA (Environmental Protection Agency) Army (Department of the Army) Navy (Department of the Navy)	$454,187,289	5.8%	Rank history: #14 in FY2021, #10 in FY2022, #13 in FY2023 and #6 in FY2025; up 8 since FY2023.
6	Jacobs Engineering Group Inc. 6 awardees, including Idaho Environmental Coalition LLC, Amentum Technology, Inc. and Ch2M Hill, Inc. Top agencies DOE (Department of Energy) Army (Department of the Army) EPA (Environmental Protection Agency)	$440,358,670	5.6%	Rank history: #4 in FY2021, #28 in FY2022, #5 in FY2023 and not on the FY2025 list; down 1 since FY2023.
7	HUI Huliau Technology Services LLC Top agencies Army (Department of the Army)	$216,505,988	2.8%	Rank history: not on the FY2021–FY2023 lists and #83 in FY2025; new.
8	EA Engineering Science and Technology Inc. PBC 2 awardees Top agencies EPA (Environmental Protection Agency) Army (Department of the Army) Navy (Department of the Navy)	$215,107,032	2.7%	Rank history: #7 in FY2021, #5 in FY2022, #6 in FY2023 and #10 in FY2025; down 2 since FY2023.
9	Hydrogeologic, Inc. Top agencies EPA (Environmental Protection Agency) Army (Department of the Army) Navy (Department of the Navy)	$175,949,681	2.2%	Rank history: #5 in FY2021, #7 in FY2022, #7 in FY2023 and #7 in FY2025; down 2 since FY2023.
10	Hanford Laboratory Management and Integration LLC Top agencies DOE (Department of Energy)	$120,000,839	1.5%	Rank history: #21 in FY2021, #13 in FY2022, #15 in FY2023 and #13 in FY2025; up 5 since FY2023.
11	Energy Technology Alliance LLC Top agencies DOE (Department of Energy)	$117,718,826	1.5%	Rank history: not on the FY2021–FY2023 lists and #16 in FY2025; up 434 since FY2023.
12	Kemron Environmental Services Inc. 3 awardees, including Kemron / Arrowhead JV, LLC and Vrhabilis-Kemron JV, LLC Top agencies EPA (Environmental Protection Agency) Army (Department of the Army) Navy (Department of the Navy)	$115,216,372	1.5%	Rank history: not on the FY2021–FY2023 lists and #27 in FY2025; up 138 since FY2023.
13	AECOM Technical Services, Inc. Top agencies EPA (Environmental Protection Agency) Army (Department of the Army) Navy (Department of the Navy)	$107,863,800	1.4%	Rank history: #67 in FY2021, not on the FY2022–FY2023 lists and #18 in FY2025; returned.
14	RSI Entech, LLC Top agencies DOE (Department of Energy)	$106,859,649	1.4%	Rank history: #13 in FY2021, #9 in FY2022, #12 in FY2023 and not on the FY2025 list; down 2 since FY2023.
15	Idaho Environmental Coalition LLC Top agencies DOE (Department of Energy)	$99,813,459	1.3%	Rank history: not on the FY2021–FY2023 lists and #15 in FY2025; new.
16	Dawson Solutions LLC Top agencies Army (Department of the Army) DHS (Department of Homeland Security) USDA (Department of Agriculture)	$94,504,440	1.2%	Rank history: not on the FY2021–FY2022 lists, #74 in FY2023 and #53 in FY2025; up 58 since FY2023.
17	Guidehouse Inc. Through Aptim Federal Services, LLC Top agencies EPA (Environmental Protection Agency) DOE (Department of Energy) Army (Department of the Army)	$83,449,339	1.1%	Rank history: not on the FY2021–FY2023 lists and #9 in FY2025; new.
18	North Wind Portage, Inc. Top agencies Army (Department of the Army) DOE (Department of Energy)	$83,235,513	1.1%	Rank history: not on the FY2021 list, #23 in FY2022, #91 in FY2023 and #14 in FY2025; up 73 since FY2023.
19	Tetra Tech, Inc. 10 awardees, including Tetra TECH EC, Inc. Top agencies DOS (Department of State) Army (Department of the Army) EPA (Environmental Protection Agency)	$80,623,054	1.0%	Rank history: #12 in FY2021, #8 in FY2022, #8 in FY2023 and #12 in FY2025; down 11 since FY2023.
20	Navarro Research and Engineering, Inc. Top agencies DOE (Department of Energy) Army (Department of the Army)	$74,385,257	0.9%	Rank history: #10 in FY2021, #16 in FY2022, #21 in FY2023 and #17 in FY2025; up 1 since FY2023.
21	Environmental Restoration LLC Top agencies EPA (Environmental Protection Agency) Army (Department of the Army)	$71,154,653	0.9%	Rank history: #9 in FY2021, #6 in FY2022, #11 in FY2023 and #11 in FY2025; down 10 since FY2023.
22	Leisnoi Diversified-Kemron 8A JV, LLC Top agencies EPA (Environmental Protection Agency)	$66,083,081	0.8%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; up 411 since FY2023.
23	Amentum Technology, Inc. Top agencies Army (Department of the Army)	$64,391,811	0.8%	Rank history: not on the FY2021–FY2023 lists and #65 in FY2025; new.
24	Environmental Chemical Corporation 3 awardees, including ECC Environmental LLC Top agencies Army (Department of the Army) EPA (Environmental Protection Agency) USAF (Department of the Air Force)	$60,391,274	0.8%	Rank history: #20 in FY2021, #29 in FY2022, #27 in FY2023 and #24 in FY2025; up 3 since FY2023.
25	Jacobs Government Services Company 7 awardees, including Ch2M Hill Bwxt West Valley, LLC, Jacobs Engineering Group Inc. and Jacobs Usae Joint Venture Top agencies DOE (Department of Energy) EPA (Environmental Protection Agency) DECA (Defense Commissary Agency)	$60,047,217	0.8%	Rank history: not on the FY2021–FY2022 lists, #34 in FY2023 and #29 in FY2025; up 9 since FY2023.
26	Aptim-Amentum Alaska Decommissioning LLC Top agencies Army (Department of the Army)	$58,730,468	0.7%	Rank history: not on the FY2021–FY2022 lists, #20 in FY2023 and not on the FY2025 list; down 6 since FY2023.
27	Ch2M Hill, Inc. Top agencies EPA (Environmental Protection Agency) USAF (Department of the Air Force) Army (Department of the Army)	$56,408,076	0.7%	Rank history: not on the FY2021 list, #27 in FY2022, not on the FY2023 list and #26 in FY2025; up 132 since FY2023.
28	Cook Inlet Region Inc. 6 awardees, including North Wind Portage, Inc., North Wind Construction Services, LLC and North Wind Site Services, LLC Top agencies DOE (Department of Energy) Army (Department of the Army) DOI (Department of the Interior)	$55,247,641	0.7%	Rank history: #6 in FY2021, #15 in FY2022, #24 in FY2023 and not on the FY2025 list; down 4 since FY2023.
29	Amentum Holdings, Inc. 2 awardees, including Central Plateau Cleanup Company, LLC Top agencies DOE (Department of Energy) Navy (Department of the Navy)	$46,861,748	0.6%	Rank history: not on the FY2021–FY2023 lists and #1 in FY2025; new.
30	Fpm-Aecom JV1 2 awardees, including Fpm-Aecom JV2 Top agencies USAF (Department of the Air Force) Army (Department of the Army) DOE (Department of Energy)	$41,214,945	0.5%	Rank history: not on the FY2021 list, #61 in FY2022, #25 in FY2023 and #57 in FY2025; down 5 since FY2023.
31	Paragon Professional Services LLC Top agencies DOE (Department of Energy) EPA (Environmental Protection Agency) Army (Department of the Army)	$37,824,497	0.5%	Rank history: #47 in FY2021, #64 in FY2022, #33 in FY2023 and #19 in FY2025; up 2 since FY2023.
32	Hgl-Aptim JV LLC Top agencies Army (Department of the Army) DLA (Defense Logistics Agency)	$37,296,027	0.5%	Rank history: #36 in FY2021, #31 in FY2022, #50 in FY2023 and #37 in FY2025; up 18 since FY2023.
33	Cape-Weston JV3 LLC Top agencies Navy (Department of the Navy) DLA (Defense Logistics Agency)	$36,456,441	0.5%	Rank history: not on the FY2021–FY2022 lists, #62 in FY2023 and #44 in FY2025; up 29 since FY2023.
34	Ch2M Hill Bwxt West Valley, LLC Top agencies DOE (Department of Energy)	$34,205,283	0.4%	Rank history: #8 in FY2021, #11 in FY2022, #14 in FY2023 and not on the FY2025 list; down 20 since FY2023.
35	EQ & CH Remediation Top agencies EPA (Environmental Protection Agency)	$32,786,469	0.4%	Rank history: #53 in FY2021, #68 in FY2022, #72 in FY2023 and not on the FY2025 list; up 37 since FY2023.
36	Enterprise Technical Assistance Services Inc. Top agencies DOE (Department of Energy)	$32,721,436	0.4%	Rank history: #38 in FY2021, #35 in FY2022, #36 in FY2023 and #60 in FY2025; unchanged since FY2023.
37	CDM Federal Programs Corporation Top agencies EPA (Environmental Protection Agency)	$31,520,978	0.4%	Rank history: not on the FY2021–FY2022 lists, #100 in FY2023 and #35 in FY2025; up 63 since FY2023.
38	C M C, Inc. Top agencies EPA (Environmental Protection Agency)	$29,861,520	0.4%	Rank history: #56 in FY2021, #30 in FY2022, #28 in FY2023 and #86 in FY2025; down 10 since FY2023.
39	Pika International Inc. 2 awardees, including Pika-Pirnie JV LLC Top agencies Army (Department of the Army)	$29,033,053	0.4%	Rank history: not on the FY2021–FY2023 lists and #72 in FY2025; up 261 since FY2023.
40	Aerostar Environmental and Construction LLC Top agencies USAF (Department of the Air Force) Army (Department of the Army) HHS (Department of Health and Human Services)	$28,804,649	0.4%	Rank history: not on the FY2021 list, #44 in FY2022, #71 in FY2023 and #49 in FY2025; up 31 since FY2023.
41	Environmental Quality Management, Inc. Top agencies EPA (Environmental Protection Agency) USAF (Department of the Air Force)	$26,889,189	0.3%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
42	J.f. Brennan Company, Inc. Top agencies EPA (Environmental Protection Agency)	$26,534,443	0.3%	Rank history: not on the FY2021 list, #12 in FY2022, not on the FY2023 list and not on the FY2025 list; up 87 since FY2023.
43	Brice Engineering, LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force) DOI (Department of the Interior)	$25,268,114	0.3%	Rank history: #39 in FY2021, #22 in FY2022, #18 in FY2023 and #32 in FY2025; down 25 since FY2023.
44	Hgl-Er JV LLC Top agencies Army (Department of the Army)	$24,051,422	0.3%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
45	Conti Federal Services, LLC Top agencies EPA (Environmental Protection Agency)	$23,990,270	0.3%	Rank history: not on the FY2021–FY2023 lists and #36 in FY2025; new.
46	Cape Environmental Management Inc. Top agencies USAF (Department of the Air Force) Army (Department of the Army) Navy (Department of the Navy)	$23,613,727	0.3%	Rank history: #11 in FY2021, #14 in FY2022, #38 in FY2023 and #28 in FY2025; down 8 since FY2023.
47	OCH JV Top agencies EPA (Environmental Protection Agency)	$21,889,138	0.3%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
48	Sustainment & Restoration Services, LLC Top agencies Army (Department of the Army) DMA (Defense Media Activity) USAF (Department of the Air Force)	$21,396,337	0.3%	Rank history: not on the FY2021–FY2023 lists and #31 in FY2025; new.
49	Nobis Engineering, Inc. Top agencies EPA (Environmental Protection Agency)	$21,358,393	0.3%	Rank history: #54 in FY2021, #53 in FY2022, not on the FY2023 list and not on the FY2025 list; up 103 since FY2023.
50	Ahtna-Arcadis 8(A) JV, LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$20,606,413	0.3%	Rank history: not on the FY2021–FY2022 lists, #68 in FY2023 and #67 in FY2025; up 18 since FY2023.
51	Olgoonik Corporation Through FPM Remediations, Inc. Top agencies Army (Department of the Army) USAF (Department of the Air Force) DHS (Department of Homeland Security)	$20,316,470	0.3%	Rank history: #34 in FY2021, #86 in FY2022, #57 in FY2023 and #39 in FY2025; up 6 since FY2023.
52	Weston Solutions Holdings, Inc. Through Weston Solutions Inc. Top agencies Army (Department of the Army)	$20,003,803	0.3%	Rank history: #83 in FY2021, #67 in FY2022, not on the FY2023 list and not on the FY2025 list; up 51 since FY2023.
53	Arctic Slope Regional Corporation 2 awardees, including Environmental Quality Management, Inc. and EQM Services, LLC Top agencies EPA (Environmental Protection Agency)	$19,665,055	0.3%	Rank history: #24 in FY2021, #42 in FY2022, #16 in FY2023 and #4 in FY2025; down 37 since FY2023.
54	ECC Environmental LLC Top agencies Navy (Department of the Navy) Army (Department of the Army)	$19,204,924	0.2%	Rank history: not on the FY2021–FY2023 lists and #50 in FY2025; new.
55	Bay West LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force) EPA (Environmental Protection Agency)	$18,641,494	0.2%	Rank history: #69 in FY2021, #70 in FY2022, #48 in FY2023 and #38 in FY2025; down 7 since FY2023.
56	Couvillion Group LLC Top agencies DHS (Department of Homeland Security)	$17,500,000	0.2%	Rank history: not on the FY2021 list, #38 in FY2022, #42 in FY2023 and #33 in FY2025; down 14 since FY2023.
57	Leisnoi Diversified Services, LLC Top agencies EPA (Environmental Protection Agency) Army (Department of the Army)	$16,014,806	0.2%	Rank history: #59 in FY2021, #58 in FY2022, #84 in FY2023 and #74 in FY2025; up 27 since FY2023.
58	Sevenson-Usa Environmental Joint Venture II Top agencies Navy (Department of the Navy)	$15,632,668	0.2%	Rank history: not on the FY2021 list, #33 in FY2022, #31 in FY2023 and not on the FY2025 list; down 27 since FY2023.
59	Parsons Corporation Through Parsons Government Services Inc. Top agencies OSD (Office of the Secretary of Defense) MDA (DOD Missile Defense Agency) Army (Department of the Army)	$15,028,960	0.2%	Rank history: #51 in FY2021, #21 in FY2022, #46 in FY2023 and #30 in FY2025; down 13 since FY2023.
60	USA Environmental, Inc. Top agencies Navy (Department of the Navy)	$14,918,533	0.2%	Rank history: #46 in FY2021, #52 in FY2022, #53 in FY2023 and #43 in FY2025; down 7 since FY2023.
61	Brice Solutions, LLC Top agencies DOT (Department of Transportation) Army (Department of the Army)	$14,759,346	0.2%	Rank history: not on the FY2021–FY2022 lists, #73 in FY2023 and not on the FY2025 list; up 12 since FY2023.
62	Seres-Arcadis SB JV, LLC Top agencies Army (Department of the Army)	$14,430,728	0.2%	Rank history: #71 in FY2021, #80 in FY2022, #70 in FY2023 and not on the FY2025 list; up 8 since FY2023.
63	Cape-Weston JV1 LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$14,231,711	0.2%	Rank history: not on the FY2021–FY2023 lists and #94 in FY2025; up 122 since FY2023.
64	Enviro-Fix Solutions LLC Top agencies Army (Department of the Army)	$14,048,833	0.2%	Rank history: not on the FY2021–FY2022 lists, #76 in FY2023 and #51 in FY2025; up 12 since FY2023.
65	AECOM 9 awardees, including Amentum Environment & Energy, Inc., URS Group, Inc. and AECOM Technical Services, Inc. Top agencies DOT (Department of Transportation) EPA (Environmental Protection Agency) USAF (Department of the Air Force)	$13,985,469	0.2%	Rank history: #2 in FY2021, #4 in FY2022, #9 in FY2023 and not on the FY2025 list; down 56 since FY2023.
66	Advanced Technologies and Laboratories (Atl) International, Inc. Top agencies HHS (Department of Health and Human Services)	$13,641,795	0.2%	Rank history: #66 in FY2021, not on the FY2022–FY2023 lists and not on the FY2025 list; returned.
67	Koman Government Solutions LLC Top agencies Army (Department of the Army) Navy (Department of the Navy) USAF (Department of the Air Force)	$13,401,713	0.2%	Rank history: not on the FY2021–FY2023 lists and #56 in FY2025; new.
68	Talces JV, LLC Top agencies USAF (Department of the Air Force) DOT (Department of Transportation)	$13,226,397	0.2%	Rank history: not on the FY2021–FY2022 lists, #98 in FY2023 and not on the FY2025 list; up 30 since FY2023.
69	Oneida Nation 3 awardees, including Sustainment & Restoration Services, LLC Top agencies Army (Department of the Army) Navy (Department of the Navy) USAF (Department of the Air Force)	$13,204,351	0.2%	Rank history: #19 in FY2021, #17 in FY2022, #22 in FY2023 and not on the FY2025 list; down 47 since FY2023.
70	Catawba-Tea, LLC Top agencies DOE (Department of Energy)	$12,396,835	0.2%	Rank history: not on the FY2021–FY2022 lists, #61 in FY2023 and #69 in FY2025; down 9 since FY2023.
71	Oneida Total Integrated Enterprises LLC Top agencies USAF (Department of the Air Force) DOI (Department of the Interior) Army (Department of the Army)	$12,021,086	0.2%	Rank history: not on the FY2021–FY2023 lists and #62 in FY2025; new.
72	EQM Services, LLC Top agencies EPA (Environmental Protection Agency)	$11,666,554	0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
73	Charter Contracting Company, LLC Top agencies Army (Department of the Army)	$11,594,969	0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
74	Techlaw Consultants Inc. Top agencies EPA (Environmental Protection Agency)	$11,489,457	0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
75	Noreas Environmental Services LLC Top agencies Army (Department of the Army)	$11,353,673	0.1%	Rank history: not on the FY2021–FY2022 lists, #86 in FY2023 and #61 in FY2025; up 11 since FY2023.
76	Cape Remediation, LLC Top agencies EPA (Environmental Protection Agency)	$11,178,533	0.1%	Rank history: not on the FY2021–FY2022 lists, #35 in FY2023 and #85 in FY2025; down 41 since FY2023.
77	Professional Project Services, Inc. Top agencies DOE (Department of Energy)	$10,712,928	0.1%	Rank history: #65 in FY2021, #63 in FY2022, not on the FY2023 list and #84 in FY2025; up 35 since FY2023.
78	Engineering/Remediation Resources Group Inc. Top agencies USDA (Department of Agriculture) Navy (Department of the Navy) Army (Department of the Army)	$9,923,590	0.1%	Rank history: not on the FY2021–FY2023 lists and #59 in FY2025; new.
79	Insight-Esi LLC Top agencies Navy (Department of the Navy)	$9,730,304	0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; up 103 since FY2023.
80	CDM Smith Inc 2 awardees, including CDM Federal Programs Corporation and Cape - CDM Smith, A Joint Venture Top agencies EPA (Environmental Protection Agency) Army (Department of the Army)	$9,712,364	0.1%	Rank history: not on the FY2021–FY2022 lists, #23 in FY2023 and not on the FY2025 list; down 57 since FY2023.
81	Plexus-Ayuda Joint Venture LLC Top agencies Army (Department of the Army) EPA (Environmental Protection Agency)	$9,422,182	0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
82	SES Civil and Environmental LLC Top agencies USAF (Department of the Air Force) Navy (Department of the Navy) Army (Department of the Army)	$9,312,446	0.1%	Rank history: not on the FY2021–FY2023 lists and #77 in FY2025; new.
83	Parsons Government Services Inc. Top agencies MDA (DOD Missile Defense Agency)	$9,288,412	0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
84	Lata-Cti Environmental Services LLC Top agencies USAF (Department of the Air Force)	$9,272,129	0.1%	Rank history: not on the FY2021 list, #94 in FY2022, not on the FY2023 list and #80 in FY2025; up 20 since FY2023.
85	Global Diving & Salvage, Inc. Top agencies DHS (Department of Homeland Security) Commerce (Department of Commerce)	$9,251,080	0.1%	Rank history: #85 in FY2021, #43 in FY2022, not on the FY2023 list and not on the FY2025 list; up 93 since FY2023.
86	Terra Solutions & Services Inc. Top agencies Army (Department of the Army)	$9,244,582	0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
87	The Cherokee Nation Through Cherokee Strategic Solutions, L.L.C. Top agencies Navy (Department of the Navy) Army (Department of the Army)	$8,910,897	0.1%	Rank history: not on the FY2021–FY2023 lists and #47 in FY2025; new.
88	A and M Engineering & Environmental Services, Inc. Top agencies EPA (Environmental Protection Agency)	$8,602,459	0.1%	Rank history: #75 in FY2021, #85 in FY2022, not on the FY2023 list and #79 in FY2025; returned.
89	Specpro-Ayuda JV, LLC Top agencies EPA (Environmental Protection Agency) Army (Department of the Army)	$8,505,428	0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; up 30 since FY2023.
90	The Source Group, Inc. Top agencies DLA (Defense Logistics Agency)	$8,176,185	0.1%	Rank history: #17 in FY2021, #41 in FY2022, not on the FY2023 list and #63 in FY2025; up 37 since FY2023.
91	Ahtna Solutions, LLC Top agencies DOT (Department of Transportation) Army (Department of the Army) USAF (Department of the Air Force)	$7,913,916	0.1%	Rank history: not on the FY2021 list, #65 in FY2022, #88 in FY2023 and #70 in FY2025; down 3 since FY2023.
92	Bristol Bay Native Corporation 4 awardees, including Bristol Environmental Solutions LLC and Specpro Professional Services, LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$7,835,659	0.1%	Rank history: not on the FY2021–FY2022 lists, #52 in FY2023 and #25 in FY2025; down 40 since FY2023.
93	Fpm-Aecom JV2 Top agencies Army (Department of the Army)	$7,790,503	0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
94	Calista Corp 2 awardees, including Brice Environmental Services Corporation Top agencies Army (Department of the Army)	$7,782,756	0.1%	Rank history: #42 in FY2021, #47 in FY2022, #89 in FY2023 and not on the FY2025 list; down 5 since FY2023.
95	GSI North America Inc. Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$7,775,804	0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
96	CDM A Joint Venture Top agencies DOE (Department of Energy) EPA (Environmental Protection Agency)	$7,586,448	0.1%	Rank history: not on the FY2021 list, #90 in FY2022, not on the FY2023 list and not on the FY2025 list; up 55 since FY2023.
97	Leidos Holdings, Inc. 2 awardees, including Leidos, Inc. Top agencies Army (Department of the Army)	$7,439,606	0.1%	Rank history: #52 in FY2021, #55 in FY2022, #67 in FY2023 and #45 in FY2025; down 30 since FY2023.
98	Gsina-Gilbane II JV LLC Top agencies USAF (Department of the Air Force)	$7,248,228	0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; up 35 since FY2023.
99	Ayuda Arcadis 8A Joint Venture LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$7,174,175	0.1%	Rank history: #58 in FY2021, not on the FY2022–FY2023 lists and not on the FY2025 list; up 29 since FY2023.
100	SES Construction and Fuel Services LLC 2 awardees, including Bristol Environmental Solutions LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$7,152,770	0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.

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100 of 1,789 contractors listed here. See the rest on GovTribe.

Rankings for the codes under NAICS 5629

Code	Net obligations	Largest contractor
56291 Remediation Services	$7,387,548,038	Savannah River Mission Completion, LLC
56299 All Other Waste Management Services	$133,408,550	Amerivet Contracting
56292 Materials Recovery Facilities	$7,453,847	Soldier Systems D-Mil, 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 $7.85 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 5629 contractors in FY2024?

1. Savannah River Mission Completion, LLC ($886M), 2. United Cleanup Oak Ridge LLC ($592M), 3. Fluor Corporation ($512M), 4. Amentum Services, Inc. ($489M), 5. Sevenson Environmental Services, Inc. ($454M), 6. Jacobs Engineering Group Inc. ($440M), 7. HUI Huliau Technology Services LLC ($217M), 8. EA Engineering Science and Technology Inc. PBC ($215M), 9. Hydrogeologic, Inc. ($176M), 10. Hanford Laboratory Management and Integration LLC ($120M).

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