Top 100 Contractors in NAICS 56291: Remediation Services, FY2023

Name: Top 100 Contractors in NAICS 56291: Remediation Services, FY2023
Creator: GovTribe

Parent companies by net contract obligations Oct 1, 2022 – Sep 30, 2023 Code page on GovTribe

The top 10 won 53% of FY2023 NAICS 56291 contract dollars

Contract obligations: $6,584,563,080 Net of deobligations, by contracts coded NAICS 56291 or a code under it
Contractors: 902 Parent companies with an obligation
Largest contractor: Savannah River Mission Completion, LLC $823 million, 12.0% 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	Savannah River Mission Completion, LLC Top agencies DOE (Department of Energy)	$823,336,868	12.0%	Rank history: not on the FY2021 list, #1 in FY2022, #1 in FY2024 and #2 in FY2025; unchanged since FY2022.
2	United Cleanup Oak Ridge LLC Top agencies DOE (Department of Energy)	$752,637,900	11.0%	Rank history: not on the FY2021–FY2022 lists, #2 in FY2024 and #7 in FY2025; new.
3	Amentum Services, Inc. 2 awardees, including Central Plateau Cleanup Company, LLC Top agencies DOE (Department of Energy) Navy (Department of the Navy)	$530,570,731	7.7%	Rank history: #3 in FY2021, #2 in FY2022, #4 in FY2024 and not on the FY2025 list; down 1 since FY2022.
4	Fluor Corporation 2 awardees, including Fluor-Bwxt Portsmouth LLC Top agencies DOE (Department of Energy)	$478,911,114	7.0%	Rank history: #1 in FY2021, #3 in FY2022, #3 in FY2024 and #3 in FY2025; down 1 since FY2022.
5	Jacobs Engineering Group Inc. 7 awardees, including Amentum Technology, Inc., Ch2M Hill, Inc. and Idaho Environmental Coalition LLC Top agencies Army (Department of the Army) EPA (Environmental Protection Agency) DOE (Department of Energy)	$260,185,526	3.8%	Rank history: #4 in FY2021, #28 in FY2022, #6 in FY2024 and not on the FY2025 list; up 23 since FY2022.
6	EA Engineering, Science, and Technology, Inc., PBC Top agencies EPA (Environmental Protection Agency) Army (Department of the Army) USAF (Department of the Air Force)	$242,089,320	3.5%	Rank history: #7 in FY2021, #5 in FY2022, #8 in FY2024 and #9 in FY2025; down 1 since FY2022.
7	Hydrogeologic, Inc. Top agencies Army (Department of the Army) EPA (Environmental Protection Agency) USAF (Department of the Air Force)	$179,060,893	2.6%	Rank history: #5 in FY2021, #7 in FY2022, #9 in FY2024 and #6 in FY2025; unchanged since FY2022.
8	Tetra Tech, Inc. 14 awardees, including Tetra TECH EC, Inc. Top agencies DOS (Department of State) Army (Department of the Army) USAF (Department of the Air Force)	$142,251,426	2.1%	Rank history: #12 in FY2021, #8 in FY2022, #19 in FY2024 and #11 in FY2025; unchanged since FY2022.
9	AECOM 9 awardees, including AECOM Technical Services, Inc., URS Group, Inc. and Amentum Environment & Energy, Inc. Top agencies EPA (Environmental Protection Agency) Army (Department of the Army) USAF (Department of the Air Force)	$136,813,823	2.0%	Rank history: #2 in FY2021, #4 in FY2022, #65 in FY2024 and not on the FY2025 list; down 5 since FY2022.
10	Aptim Federal Services LLC 2 awardees Top agencies DOE (Department of Energy) EPA (Environmental Protection Agency) Army (Department of the Army)	$124,494,647	1.8%	Rank history: #32 in FY2021, #19 in FY2022 and not on the FY2024–FY2025 lists; up 9 since FY2022.
11	Environmental Restoration LLC Top agencies EPA (Environmental Protection Agency)	$99,807,008	1.5%	Rank history: #9 in FY2021, #6 in FY2022, #21 in FY2024 and #10 in FY2025; down 5 since FY2022.
12	RSI Entech, LLC Top agencies DOE (Department of Energy)	$93,269,485	1.4%	Rank history: #13 in FY2021, #9 in FY2022, #14 in FY2024 and not on the FY2025 list; down 3 since FY2022.
13	Sevenson Environmental Services, Inc. Top agencies Army (Department of the Army) EPA (Environmental Protection Agency) Navy (Department of the Navy)	$90,819,313	1.3%	Rank history: #14 in FY2021, #10 in FY2022, #5 in FY2024 and #5 in FY2025; down 3 since FY2022.
14	Ch2M Hill Bwxt West Valley, LLC Top agencies DOE (Department of Energy)	$87,558,755	1.3%	Rank history: #8 in FY2021, #11 in FY2022, #34 in FY2024 and not on the FY2025 list; down 3 since FY2022.
15	Hanford Laboratory Management and Integration LLC Top agencies DOE (Department of Energy)	$85,471,763	1.2%	Rank history: #21 in FY2021, #13 in FY2022, #10 in FY2024 and #12 in FY2025; down 2 since FY2022.
16	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)	$85,280,371	1.2%	Rank history: #24 in FY2021, #42 in FY2022, #53 in FY2024 and #4 in FY2025; up 26 since FY2022.
17	Central Plateau Cleanup Company, LLC Top agencies DOE (Department of Energy)	$74,906,529	1.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
18	Brice Engineering, LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force) DOI (Department of the Interior)	$72,684,435	1.1%	Rank history: #45 in FY2021, #25 in FY2022, #49 in FY2024 and #30 in FY2025; up 7 since FY2022.
19	Nelson Environmental Remediation USA Ltd Top agencies USAID (US Agency for International Development)	$71,013,106	1.0%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
20	Aptim-Amentum Alaska Decommissioning LLC Top agencies Army (Department of the Army)	$65,253,684	0.9%	Rank history: not on the FY2021–FY2022 lists, #26 in FY2024 and not on the FY2025 list; new.
21	Navarro Research and Engineering, Inc. 2 awardees Top agencies DOE (Department of Energy) Army (Department of the Army) USAF (Department of the Air Force)	$63,709,913	0.9%	Rank history: #10 in FY2021, #16 in FY2022, #20 in FY2024 and #16 in FY2025; down 5 since FY2022.
22	Oneida Nation 5 awardees, including Sustainment & Restoration Services, LLC, OCH JV and Oneida Total Integrated Enterprises LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force) EPA (Environmental Protection Agency)	$60,356,501	0.9%	Rank history: #19 in FY2021, #17 in FY2022, #69 in FY2024 and not on the FY2025 list; down 5 since FY2022.
23	CDM Smith Inc Through CDM Federal Programs Corporation Top agencies EPA (Environmental Protection Agency)	$57,803,122	0.8%	Rank history: not on the FY2021–FY2022 lists, #80 in FY2024 and not on the FY2025 list; new.
24	Cook Inlet Region Inc. 6 awardees, including North Wind Portage, Inc. and North Wind, Inc. Top agencies DOE (Department of Energy) Army (Department of the Army) DLA (Defense Logistics Agency)	$56,089,919	0.8%	Rank history: #6 in FY2021, #15 in FY2022, #28 in FY2024 and not on the FY2025 list; down 9 since FY2022.
25	Fpm-Aecom JV1 Top agencies Army (Department of the Army) USAF (Department of the Air Force) DOE (Department of Energy)	$52,014,253	0.8%	Rank history: not on the FY2021 list, #61 in FY2022, #30 in FY2024 and #54 in FY2025; up 36 since FY2022.
26	Aptim AECOM Decommissioning, LLC Top agencies Army (Department of the Army)	$48,732,607	0.7%	Rank history: #26 in FY2021, not on the FY2022 list and not on the FY2024–FY2025 lists; up 309 since FY2022.
27	Environmental Chemical Corporation 4 awardees, including ECC Environmental LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force) MDA (DOD Missile Defense Agency)	$44,621,602	0.6%	Rank history: #20 in FY2021, #29 in FY2022, #24 in FY2024 and #22 in FY2025; up 2 since FY2022.
28	C M C, Inc. Top agencies EPA (Environmental Protection Agency)	$42,663,299	0.6%	Rank history: #56 in FY2021, #30 in FY2022, #38 in FY2024 and #83 in FY2025; up 2 since FY2022.
29	Kemron / Arrowhead JV, LLC Top agencies EPA (Environmental Protection Agency)	$39,785,837	0.6%	Rank history: #76 in FY2021, #36 in FY2022 and not on the FY2024–FY2025 lists; up 7 since FY2022.
30	AECOM Arcadis Pfas JV Top agencies Army (Department of the Army)	$36,446,227	0.5%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
31	Sevenson-Usa Environmental Joint Venture II Top agencies Navy (Department of the Navy)	$36,389,938	0.5%	Rank history: not on the FY2021 list, #33 in FY2022, #58 in FY2024 and not on the FY2025 list; up 2 since FY2022.
32	Aerostar SES LLC 2 awardees Top agencies USAF (Department of the Air Force) Army (Department of the Army)	$33,931,528	0.5%	Rank history: #22 in FY2021, #100 in FY2022 and not on the FY2024–FY2025 lists; up 68 since FY2022.
33	Paragon Professional Services LLC Top agencies DOE (Department of Energy) EPA (Environmental Protection Agency) Army (Department of the Army)	$33,443,619	0.5%	Rank history: #47 in FY2021, #64 in FY2022, #31 in FY2024 and #18 in FY2025; up 31 since FY2022.
34	Jacobs Government Services Company 3 awardees, including Ch2M Hill Constructors, Inc. Top agencies Army (Department of the Army)	$32,396,487	0.5%	Rank history: not on the FY2021–FY2022 lists, #25 in FY2024 and #27 in FY2025; new.
35	Cape Remediation, LLC Top agencies EPA (Environmental Protection Agency) Army (Department of the Army)	$30,717,369	0.4%	Rank history: not on the FY2021–FY2022 lists, #76 in FY2024 and #82 in FY2025; up 247 since FY2022.
36	Enterprise Technical Assistance Services Inc. Top agencies DOE (Department of Energy)	$30,144,333	0.4%	Rank history: #38 in FY2021, #35 in FY2022, #36 in FY2024 and #57 in FY2025; down 1 since FY2022.
37	Veterans Holding Group LLC Through Relyant Global LLC Top agencies Army (Department of the Army)	$29,776,456	0.4%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
38	Cape Environmental Management Inc. Top agencies USAF (Department of the Air Force) Navy (Department of the Navy) Army (Department of the Army)	$28,446,162	0.4%	Rank history: #11 in FY2021, #14 in FY2022, #45 in FY2024 and #26 in FY2025; down 24 since FY2022.
39	Kemron Environmental Services, Inc. Top agencies EPA (Environmental Protection Agency) Army (Department of the Army)	$26,500,292	0.4%	Rank history: #27 in FY2021, #32 in FY2022 and not on the FY2024–FY2025 lists; down 7 since FY2022.
40	Pika-Insight JV LLC Top agencies Army (Department of the Army) Navy (Department of the Navy)	$26,017,594	0.4%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; up 235 since FY2022.
41	Arrowhead Contracting, LLC Top agencies EPA (Environmental Protection Agency)	$25,843,246	0.4%	Rank history: not on the FY2021–FY2022 lists, not on the FY2024 list and #45 in FY2025; new.
42	Couvillion Group LLC Top agencies DHS (Department of Homeland Security)	$25,724,737	0.4%	Rank history: not on the FY2021 list, #38 in FY2022, #56 in FY2024 and #31 in FY2025; down 4 since FY2022.
43	Northwind-Jacobs Joint Venture Top agencies Army (Department of the Army)	$25,396,678	0.4%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; up 73 since FY2022.
44	Ahtna, Incorporated 4 awardees, including Ahtna Global LLC, Ahtna Engineering Services, LLC and Ahtna Environmental, Inc. Top agencies Army (Department of the Army) USAF (Department of the Air Force) DOT (Department of Transportation)	$25,063,301	0.4%	Rank history: #30 in FY2021, #40 in FY2022 and not on the FY2024–FY2025 lists; down 4 since FY2022.
45	Ea-Wood-1 MP JV Top agencies Navy (Department of the Navy)	$22,173,670	0.3%	Rank history: #55 in FY2021, not on the FY2022 list and not on the FY2024–FY2025 lists; up 92 since FY2022.
46	Parsons Corporation Through Parsons Government Services Inc. Top agencies Army (Department of the Army) MDA (DOD Missile Defense Agency) OSD (Office of the Secretary of Defense)	$21,719,682	0.3%	Rank history: #51 in FY2021, #21 in FY2022, #59 in FY2024 and #28 in FY2025; down 25 since FY2022.
47	Four Rivers Nuclear Partnership LLC Top agencies DOE (Department of Energy)	$21,683,615	0.3%	Rank history: #61 in FY2021, #62 in FY2022 and not on the FY2024–FY2025 lists; up 15 since FY2022.
48	Bay West LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force) EPA (Environmental Protection Agency)	$21,625,806	0.3%	Rank history: #69 in FY2021, #70 in FY2022, #55 in FY2024 and #36 in FY2025; up 22 since FY2022.
49	Cherokee Strategic Solutions, L.L.C. Top agencies Navy (Department of the Navy) Army (Department of the Army) DLA (Defense Logistics Agency)	$20,817,498	0.3%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
50	Hgl-Aptim JV LLC Top agencies Army (Department of the Army) DLA (Defense Logistics Agency)	$20,198,109	0.3%	Rank history: #36 in FY2021, #31 in FY2022, #32 in FY2024 and #35 in FY2025; down 19 since FY2022.
51	Asrc Consulting & Environmental Services LLC Top agencies DOI (Department of the Interior)	$19,447,132	0.3%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
52	Bristol Bay Native Corporation 4 awardees, including Bristol Environmental Solutions LLC, Specpro Professional Services, LLC and Bristol Site Contractors, LLC Top agencies Army (Department of the Army)	$19,163,575	0.3%	Rank history: not on the FY2021–FY2022 lists, #92 in FY2024 and #23 in FY2025; up 146 since FY2022.
53	USA Environmental, Inc. Top agencies Navy (Department of the Navy) Army (Department of the Army)	$18,915,978	0.3%	Rank history: #46 in FY2021, #52 in FY2022, #60 in FY2024 and #41 in FY2025; down 1 since FY2022.
54	Mark Cerrone, Inc. Top agencies Army (Department of the Army)	$17,553,000	0.3%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
55	Natives of Kodiak, Incorporated 2 awardees, including Koman Government Solutions LLC and Environmental Assessment Services, LLC Top agencies Army (Department of the Army) Navy (Department of the Navy)	$17,388,412	0.3%	Rank history: #48 in FY2021, #51 in FY2022 and not on the FY2024–FY2025 lists; down 4 since FY2022.
56	Hdr, Inc. 2 awardees, including HDR Aptim LLC and HDR Environmental, Operations and Construction, Inc. Top agencies EPA (Environmental Protection Agency) Army (Department of the Army)	$16,643,963	0.2%	Rank history: #57 in FY2021, #46 in FY2022 and not on the FY2024–FY2025 lists; down 10 since FY2022.
57	Olgoonik Corporation Through FPM Remediations, Inc. Top agencies USAF (Department of the Air Force) Army (Department of the Army) DHS (Department of Homeland Security)	$16,255,671	0.2%	Rank history: #34 in FY2021, #86 in FY2022, #51 in FY2024 and #37 in FY2025; up 29 since FY2022.
58	Ciri Development Corporation 5 awardees, including North Wind Construction Services, LLC, North Wind-Ea JV, LLC and North Wind Site Services, LLC Top agencies DOI (Department of the Interior) Army (Department of the Army) DOE (Department of Energy)	$15,845,524	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; up 45 since FY2022.
59	Brice-Aecom JV1 Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$15,554,451	0.2%	Rank history: #23 in FY2021, #78 in FY2022 and not on the FY2024–FY2025 lists; up 19 since FY2022.
60	Engineering / Remediation Resources Group, Inc. 4 awardees Top agencies Army (Department of the Army) USDA (Department of Agriculture) Navy (Department of the Navy)	$15,030,214	0.2%	Rank history: #99 in FY2021, #37 in FY2022 and not on the FY2024–FY2025 lists; down 23 since FY2022.
61	Catawba-Tea, LLC Top agencies DOE (Department of Energy)	$14,921,737	0.2%	Rank history: not on the FY2021–FY2022 lists, #70 in FY2024 and #66 in FY2025; new.
62	Cape-Weston JV3 LLC Top agencies Navy (Department of the Navy)	$14,804,719	0.2%	Rank history: not on the FY2021–FY2022 lists, #33 in FY2024 and #42 in FY2025; up 169 since FY2022.
63	Native Hawaiian Community Development Corporation 3 awardees, including GSI North America Inc. Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$14,012,271	0.2%	Rank history: not on the FY2021 list, #95 in FY2022 and not on the FY2024–FY2025 lists; up 32 since FY2022.
64	A and M Engineering & Environmental Services Inc Top agencies EPA (Environmental Protection Agency)	$13,920,364	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
65	ST George Tanaq Corp 2 awardees, including Tanaq Environmental LLC and Heliotech Top agencies Army (Department of the Army) EPA (Environmental Protection Agency) USAF (Department of the Air Force)	$13,625,533	0.2%	Rank history: #72 in FY2021, #76 in FY2022 and not on the FY2024–FY2025 lists; up 11 since FY2022.
66	Leidos Holdings, Inc. 2 awardees, including Leidos, Inc. and Leidos-Cdm Solutions LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$13,374,304	0.2%	Rank history: #52 in FY2021, #55 in FY2022, #97 in FY2024 and #43 in FY2025; down 11 since FY2022.
67	Ahtna-Arcadis 8(A) JV, LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$13,240,747	0.2%	Rank history: not on the FY2021–FY2022 lists, #50 in FY2024 and #64 in FY2025; new.
68	SES Civil and Environmental LLC Top agencies USAF (Department of the Air Force) Army (Department of the Army) Navy (Department of the Navy)	$13,158,556	0.2%	Rank history: #81 in FY2021, #77 in FY2022 and not on the FY2024–FY2025 lists; up 9 since FY2022.
69	Seres-Arcadis SB JV, LLC Top agencies Army (Department of the Army)	$13,132,135	0.2%	Rank history: #71 in FY2021, #80 in FY2022, #62 in FY2024 and not on the FY2025 list; up 11 since FY2022.
70	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)	$12,929,026	0.2%	Rank history: not on the FY2021 list, #44 in FY2022, #40 in FY2024 and #46 in FY2025; down 26 since FY2022.
71	EQ & CH Remediation Top agencies EPA (Environmental Protection Agency)	$12,831,525	0.2%	Rank history: #53 in FY2021, #68 in FY2022, #35 in FY2024 and not on the FY2025 list; down 3 since FY2022.
72	Brice Solutions, LLC Top agencies DOT (Department of Transportation) Army (Department of the Army)	$12,298,346	0.2%	Rank history: not on the FY2021–FY2022 lists, #61 in FY2024 and not on the FY2025 list; up 48 since FY2022.
73	Dawson Solutions LLC Top agencies Army (Department of the Army) DHS (Department of Homeland Security) USAF (Department of the Air Force)	$12,221,923	0.2%	Rank history: not on the FY2021–FY2022 lists, #16 in FY2024 and #50 in FY2025; new.
74	Confederated Salish and Kootenai Tribes 2 awardees, including S&K Mission Support, LLC and S & K Logistics Services LLC Top agencies DOE (Department of Energy)	$12,021,513	0.2%	Rank history: #82 in FY2021, not on the FY2022 list and not on the FY2024–FY2025 lists; up 36 since FY2022.
75	Enviro-Fix Solutions LLC Top agencies Army (Department of the Army)	$11,984,342	0.2%	Rank history: not on the FY2021–FY2022 lists, #64 in FY2024 and #48 in FY2025; new.
76	Noreas Aptim Environmental Remediation JV Top agencies EPA (Environmental Protection Agency) Navy (Department of the Navy)	$11,908,205	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; up 45 since FY2022.
77	Mission Support Services LLC 2 awardees, including Oneida Total Integrated Enterprises LLC Top agencies USAF (Department of the Air Force) DLA (Defense Logistics Agency) VA (Department of Veterans Affairs)	$11,894,564	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
78	Bhate Zapata, LLC Top agencies USAF (Department of the Air Force) Army (Department of the Army)	$11,702,210	0.2%	Rank history: #35 in FY2021, #99 in FY2022 and not on the FY2024–FY2025 lists; up 21 since FY2022.
79	Planned Systems International Inc. Through Advanced Technologies and Laboratories (Atl) International, Inc. Top agencies HHS (Department of Health and Human Services)	$11,517,357	0.2%	Rank history: not on the FY2021 list, #59 in FY2022 and not on the FY2024–FY2025 lists; down 20 since FY2022.
80	BEM Systems Inc. Top agencies USAF (Department of the Air Force)	$11,411,777	0.2%	Rank history: #100 in FY2021, #54 in FY2022 and not on the FY2024–FY2025 lists; down 26 since FY2022.
81	Huntington Ingalls Industries, Inc. 2 awardees, including Newport News Nuclear Bwxt-Los Alamos LLC Top agencies DOE (Department of Energy)	$10,931,322	0.2%	Rank history: #90 in FY2021, #71 in FY2022, not on the FY2024 list and #78 in FY2025; down 10 since FY2022.
82	Pe Ayuda Joint Venture LLC Top agencies Army (Department of the Army)	$10,173,465	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
83	Leisnoi Diversified Services, LLC Top agencies EPA (Environmental Protection Agency)	$9,996,821	0.1%	Rank history: #59 in FY2021, #58 in FY2022, #57 in FY2024 and #71 in FY2025; down 25 since FY2022.
84	Tikigaq Corporation Through Agviq LLC Top agencies Navy (Department of the Navy)	$9,943,203	0.1%	Rank history: #25 in FY2021, #39 in FY2022 and not on the FY2024–FY2025 lists; down 45 since FY2022.
85	Noreas Environmental Services LLC Top agencies Army (Department of the Army)	$9,769,313	0.1%	Rank history: not on the FY2021–FY2022 lists, #75 in FY2024 and #58 in FY2025; new.
86	CTL Environmental LLC Top agencies Army (Department of the Army)	$9,394,818	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; up 118 since FY2022.
87	Ahtna Solutions, LLC Top agencies Army (Department of the Army) DOT (Department of Transportation)	$9,386,573	0.1%	Rank history: not on the FY2021 list, #65 in FY2022, #91 in FY2024 and #67 in FY2025; down 22 since FY2022.
88	Calista Corp 2 awardees, including Brice Environmental Services Corporation Top agencies Army (Department of the Army)	$9,227,292	0.1%	Rank history: #41 in FY2021, #47 in FY2022, #94 in FY2024 and not on the FY2025 list; down 41 since FY2022.
89	CDM Smith-Bay West JV, A Joint Venture Top agencies Army (Department of the Army)	$9,170,406	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
90	North Wind Portage, Inc. Top agencies DOE (Department of Energy)	$9,076,079	0.1%	Rank history: not on the FY2021 list, #22 in FY2022, #18 in FY2024 and #13 in FY2025; down 68 since FY2022.
91	Bhate Environmental Associates, Inc. Top agencies USAF (Department of the Air Force) DLA (Defense Logistics Agency)	$8,835,038	0.1%	Rank history: #63 in FY2021, #50 in FY2022, not on the FY2024 list and #91 in FY2025; down 41 since FY2022.
92	Moran Environmental Recovery, LLC 2 awardees, including Mainstream Commercial Divers, Inc. Top agencies DHS (Department of Homeland Security) Navy (Department of the Navy) Army (Department of the Army)	$8,576,014	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; up 88 since FY2022.
93	Versar-Envirocon JV Top agencies EPA (Environmental Protection Agency)	$8,510,801	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; up 50 since FY2022.
94	GSI Mmrp JV LLC Top agencies Army (Department of the Army)	$8,227,315	0.1%	Rank history: not on the FY2021 list, #73 in FY2022 and not on the FY2024–FY2025 lists; down 21 since FY2022.
95	3D Envirologics LLC Top agencies HHS (Department of Health and Human Services)	$7,957,979	0.1%	Rank history: not on the FY2021–FY2022 lists, not on the FY2024 list and #86 in FY2025; up 18 since FY2022.
96	The Aleut Corporation 2 awardees, including Aleut Remediation LLC Top agencies Army (Department of the Army) Navy (Department of the Navy)	$7,936,998	0.1%	Rank history: #95 in FY2021, not on the FY2022 list and not on the FY2024–FY2025 lists; up 99 since FY2022.
97	Talces JV, LLC Top agencies USAF (Department of the Air Force)	$7,872,341	0.1%	Rank history: not on the FY2021–FY2022 lists, #68 in FY2024 and not on the FY2025 list; new.
98	Eqms-Bem JV, LLC Top agencies USAF (Department of the Air Force)	$7,731,609	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
99	CDM Federal Programs Corporation Top agencies EPA (Environmental Protection Agency)	$7,560,635	0.1%	Rank history: not on the FY2021–FY2022 lists, #37 in FY2024 and #33 in FY2025; up 232 since FY2022.
100	Nuclear Ship Support Services LLC Top agencies DOT (Department of Transportation)	$7,124,554	0.1%	Rank history: #18 in FY2021, #56 in FY2022, not on the FY2024 list and #79 in FY2025; down 44 since FY2022.

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100 of 902 contractors listed here. See the rest on GovTribe.

Rankings for the codes under NAICS 56291

Code	Net obligations	Largest contractor
562910 Remediation Services	$6,584,563,080	Savannah River Mission Completion, 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 $6.87 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 2023 ran Oct 1, 2022 – Sep 30, 2023. 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 FY2022. "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 FY2022 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 56291 contractors in FY2023?

1. Savannah River Mission Completion, LLC ($823M), 2. United Cleanup Oak Ridge LLC ($753M), 3. Amentum Services, Inc. ($531M), 4. Fluor Corporation ($479M), 5. Jacobs Engineering Group Inc. ($260M), 6. EA Engineering, Science, and Technology, Inc., PBC ($242M), 7. Hydrogeologic, Inc. ($179M), 8. Tetra Tech, Inc. ($142M), 9. AECOM ($137M), 10. Aptim Federal Services LLC ($124M).

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