Top 100 Contractors in NAICS 54162: Environmental Consulting Services, FY2024

Name: Top 100 Contractors in NAICS 54162: Environmental Consulting Services, FY2024
Creator: GovTribe

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

The top 10 won 35% of FY2024 NAICS 54162 contract dollars

Contract obligations: $1,450,763,858 Net of deobligations, by contracts coded NAICS 54162 or a code under it
Contractors: 1,071 Parent companies with an obligation
Largest contractor: Eastern Research Group Inc. $107 million, 6.8% 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	Eastern Research Group Inc. Top agencies EPA (Environmental Protection Agency) DOI (Department of the Interior) DOL (Department of Labor)	$106,646,914	6.8%	Rank history: #3 in FY2021, #2 in FY2022, #2 in FY2023 and #3 in FY2025; up 1 since FY2023.
2	Tetra Tech, Inc. 11 awardees Top agencies EPA (Environmental Protection Agency) NASA (National Aeronautics and Space Administration) USAF (Department of the Air Force)	$99,745,522	6.4%	Rank history: #1 in FY2021, #1 in FY2022, #1 in FY2023 and #1 in FY2025; down 1 since FY2023.
3	The Cadmus Group LLC Top agencies EPA (Environmental Protection Agency) DHS (Department of Homeland Security) USAID (US Agency for International Development)	$95,187,479	6.1%	Rank history: not on the FY2021 list, #17 in FY2022, #4 in FY2023 and #19 in FY2025; up 1 since FY2023.
4	Project Enhancement Corporation Top agencies DOE (Department of Energy) DOL (Department of Labor)	$48,493,302	3.1%	Rank history: #4 in FY2021, #4 in FY2022, #3 in FY2023 and #4 in FY2025; down 1 since FY2023.
5	S C & A Inc. Top agencies EPA (Environmental Protection Agency) DOE (Department of Energy) DHS (Department of Homeland Security)	$41,355,447	2.7%	Rank history: #48 in FY2021, #47 in FY2022, #33 in FY2023 and #6 in FY2025; up 28 since FY2023.
6	Weston Solutions Holdings, Inc. 4 awardees, including Weston Solutions Inc. Top agencies EPA (Environmental Protection Agency) DOT (Department of Transportation)	$37,557,253	2.4%	Rank history: #6 in FY2021, #6 in FY2022, #6 in FY2023 and #2 in FY2025; unchanged since FY2023.
7	General Dynamics Corporation 2 awardees, including General Dynamics Information Technology, Inc. Top agencies EPA (Environmental Protection Agency)	$37,450,568	2.4%	Rank history: #32 in FY2021, not on the FY2022 list, #37 in FY2023 and #9 in FY2025; up 30 since FY2023.
8	Lynker Corporation Top agencies Commerce (Department of Commerce)	$33,817,494	2.2%	Rank history: #15 in FY2021, #9 in FY2022, #8 in FY2023 and #5 in FY2025; unchanged since FY2023.
9	CDM Federal Programs Corporation Top agencies DHS (Department of Homeland Security) EPA (Environmental Protection Agency)	$24,728,113	1.6%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
10	Consolidated Safety Services Incorporated Top agencies Commerce (Department of Commerce) HHS (Department of Health and Human Services) DOI (Department of the Interior)	$21,560,809	1.4%	Rank history: #14 in FY2021, #11 in FY2022, #10 in FY2023 and #22 in FY2025; unchanged since FY2023.
11	Environmental Incentives, Inc. Top agencies USAID (US Agency for International Development)	$17,075,002	1.1%	Rank history: #5 in FY2021, #5 in FY2022, #7 in FY2023 and #34 in FY2025; down 4 since FY2023.
12	Research Triangle Institute Top agencies EPA (Environmental Protection Agency)	$15,799,181	1.0%	Rank history: #12 in FY2021, #15 in FY2022, #20 in FY2023 and #40 in FY2025; up 8 since FY2023.
13	Golder Europe Service Centre SRL 5 awardees, including WSP USA Solutions Inc., WSP USA Inc. and WSP Italia S.R.L. Top agencies DOT (Department of Transportation) DOI (Department of the Interior) DOE (Department of Energy)	$14,649,603	0.9%	Rank history: not on the FY2021–FY2023 lists and #25 in FY2025; up 104 since FY2023.
14	Skeo Solutions, Inc. Top agencies EPA (Environmental Protection Agency)	$14,074,259	0.9%	Rank history: #70 in FY2021, #10 in FY2022, #16 in FY2023 and #57 in FY2025; up 2 since FY2023.
15	SOL Solutions LLC Top agencies Army (Department of the Army) Navy (Department of the Navy)	$13,873,359	0.9%	Rank history: not on the FY2021–FY2023 lists and #39 in FY2025; new.
16	Weston-Techlaw JV LLC Top agencies EPA (Environmental Protection Agency)	$13,298,219	0.9%	Rank history: not on the FY2021 list, #30 in FY2022, #14 in FY2023 and #20 in FY2025; down 2 since FY2023.
17	Gryphon Environmental, LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force) Navy (Department of the Navy)	$13,137,210	0.8%	Rank history: #22 in FY2021, #16 in FY2022, #19 in FY2023 and #12 in FY2025; up 2 since FY2023.
18	The Solution Foundry, LLC Top agencies USAF (Department of the Air Force) Army (Department of the Army)	$11,538,131	0.7%	Rank history: #24 in FY2021, #14 in FY2022, #24 in FY2023 and #14 in FY2025; up 6 since FY2023.
19	ICF International, Inc. Through ICF Incorporated, L.L.C. Top agencies EPA (Environmental Protection Agency) DOT (Department of Transportation) DOI (Department of the Interior)	$11,388,566	0.7%	Rank history: #8 in FY2021, #7 in FY2022, #13 in FY2023 and not on the FY2025 list; down 6 since FY2023.
20	Marstel-Day LLC 2 awardees Top agencies Navy (Department of the Navy) DOI (Department of the Interior) USAF (Department of the Air Force)	$9,965,969	0.6%	Rank history: not on the FY2021 list, #41 in FY2022, #17 in FY2023 and #23 in FY2025; down 3 since FY2023.
21	Great Lakes Environmental Center, Inc. Top agencies EPA (Environmental Protection Agency) Army (Department of the Army) DOI (Department of the Interior)	$9,954,372	0.6%	Rank history: #60 in FY2021, #24 in FY2022, #23 in FY2023 and #37 in FY2025; up 2 since FY2023.
22	Semanticbits LLC Through ICF Incorporated, L.L.C. Top agencies EPA (Environmental Protection Agency) DOT (Department of Transportation)	$9,902,534	0.6%	Rank history: not on the FY2021–FY2023 lists and #35 in FY2025; new.
23	Chemonics International, Inc. Top agencies USAID (US Agency for International Development)	$9,790,366	0.6%	Rank history: not on the FY2021–FY2022 lists, #45 in FY2023 and #42 in FY2025; up 22 since FY2023.
24	Bluestone Environmental Group, Inc. Top agencies Army (Department of the Army) NASA (National Aeronautics and Space Administration) Navy (Department of the Navy)	$9,760,630	0.6%	Rank history: #86 in FY2021, #48 in FY2022, #36 in FY2023 and #16 in FY2025; up 12 since FY2023.
25	Tellus Civic Science Corporation Top agencies Commerce (Department of Commerce)	$9,419,785	0.6%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
26	Chenega Reliable Services LLC Top agencies USAF (Department of the Air Force) Army (Department of the Army)	$9,391,195	0.6%	Rank history: not on the FY2021–FY2023 lists and #26 in FY2025; new.
27	Mabbett & Associates, Inc. Top agencies VA (Department of Veterans Affairs) USDA (Department of Agriculture) GSA (General Services Administration)	$9,031,249	0.6%	Rank history: #37 in FY2021, #39 in FY2022, #39 in FY2023 and #50 in FY2025; up 12 since FY2023.
28	Science Applications International Corporation 2 awardees Top agencies EPA (Environmental Protection Agency)	$8,790,450	0.6%	Rank history: #49 in FY2021, #84 in FY2022, #56 in FY2023 and #45 in FY2025; up 28 since FY2023.
29	SRC Inc. Top agencies EPA (Environmental Protection Agency) HHS (Department of Health and Human Services)	$8,741,410	0.6%	Rank history: #23 in FY2021, #23 in FY2022, #32 in FY2023 and #75 in FY2025; up 3 since FY2023.
30	Potomac-Hudson Engineering Inc Top agencies DOE (Department of Energy) GSA (General Services Administration) DOS (Department of State)	$8,278,342	0.5%	Rank history: not on the FY2021–FY2023 lists and #49 in FY2025; up 124 since FY2023.
31	AECOM 4 awardees, including Environmental Management & Planning Solutions LLC, AECOM International Inc. and AECOM Italia S.P.A. Top agencies DOI (Department of the Interior) Army (Department of the Army) USDA (Department of Agriculture)	$8,134,205	0.5%	Rank history: #20 in FY2021, #22 in FY2022, #26 in FY2023 and not on the FY2025 list; down 5 since FY2023.
32	Straughan Environmental, Inc. Top agencies USDA (Department of Agriculture) NASA (National Aeronautics and Space Administration) HHS (Department of Health and Human Services)	$7,801,752	0.5%	Rank history: #62 in FY2021, #71 in FY2022, #59 in FY2023 and #64 in FY2025; up 27 since FY2023.
33	Logan Simpson Design Inc. 3 awardees Top agencies DOI (Department of the Interior) EPA (Environmental Protection Agency) USDA (Department of Agriculture)	$7,348,466	0.5%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; up 82 since FY2023.
34	Ocean Associates Inc. Top agencies Commerce (Department of Commerce)	$7,232,280	0.5%	Rank history: #79 in FY2021, #63 in FY2022, #82 in FY2023 and #47 in FY2025; up 48 since FY2023.
35	AECOM Technical Services, Inc. Top agencies NASA (National Aeronautics and Space Administration) Commerce (Department of Commerce) Army (Department of the Army)	$6,989,445	0.4%	Rank history: not on the FY2021–FY2023 lists and #61 in FY2025; new.
36	Hsg, LLC Top agencies NASA (National Aeronautics and Space Administration) DOI (Department of the Interior) USAF (Department of the Air Force)	$6,831,755	0.4%	Rank history: #50 in FY2021, #40 in FY2022, #53 in FY2023 and #21 in FY2025; up 17 since FY2023.
37	Aerostar Environmental and Construction LLC Top agencies Army (Department of the Army)	$6,784,870	0.4%	Rank history: not on the FY2021 list, #49 in FY2022, #35 in FY2023 and #31 in FY2025; down 2 since FY2023.
38	Integrated Systems Solutions, Inc. Top agencies Commerce (Department of Commerce)	$6,705,592	0.4%	Rank history: #71 in FY2021, #50 in FY2022, #75 in FY2023 and #44 in FY2025; up 37 since FY2023.
39	Brice Solutions, LLC Top agencies DHS (Department of Homeland Security) Army (Department of the Army)	$6,615,822	0.4%	Rank history: not on the FY2021–FY2023 lists and #87 in FY2025; up 356 since FY2023.
40	Whitetail Environmental, LLC Top agencies Army (Department of the Army) DOI (Department of the Interior)	$6,435,355	0.4%	Rank history: #91 in FY2021, #37 in FY2022, #40 in FY2023 and #99 in FY2025; unchanged since FY2023.
41	Sundance Consultants, LLC 2 awardees, including Sundance EA Associates II Top agencies Navy (Department of the Navy) DOI (Department of the Interior) USDA (Department of Agriculture)	$6,359,468	0.4%	Rank history: not on the FY2021 list, #89 in FY2022, #21 in FY2023 and #52 in FY2025; down 20 since FY2023.
42	First Environment Inc. Top agencies Army (Department of the Army) VA (Department of Veterans Affairs)	$6,317,056	0.4%	Rank history: #42 in FY2021, not on the FY2022–FY2023 lists and #86 in FY2025; up 88 since FY2023.
43	Environmental Research Group LLC Top agencies Army (Department of the Army) Navy (Department of the Navy) VA (Department of Veterans Affairs)	$6,255,462	0.4%	Rank history: not on the FY2021–FY2022 lists, #38 in FY2023 and #66 in FY2025; down 5 since FY2023.
44	Independent Strategic Management Solutions Inc Top agencies DOE (Department of Energy)	$6,173,112	0.4%	Rank history: not on the FY2021–FY2023 lists and #24 in FY2025; up 169 since FY2023.
45	Property & Environmental Management Inc. Top agencies HHS (Department of Health and Human Services)	$6,171,781	0.4%	Rank history: not on the FY2021–FY2023 lists and #88 in FY2025; new.
46	Nelson Engineering Co. Top agencies HHS (Department of Health and Human Services) Commerce (Department of Commerce) DOI (Department of the Interior)	$6,067,290	0.4%	Rank history: #74 in FY2021, not on the FY2022 list, #68 in FY2023 and not on the FY2025 list; up 22 since FY2023.
47	Joyce Coffee Consulting LLC Top agencies EPA (Environmental Protection Agency)	$5,985,163	0.4%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; up 300 since FY2023.
48	The Clark Group. Llc Top agencies USDA (Department of Agriculture) DOJ (Department of Justice)	$5,961,051	0.4%	Rank history: not on the FY2021 list, #74 in FY2022, not on the FY2023 list and not on the FY2025 list; up 60 since FY2023.
49	Environmental Assessment Services, LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$5,942,861	0.4%	Rank history: not on the FY2021–FY2023 lists and #10 in FY2025; new.
50	Mantech SRS Technologies, Inc. Top agencies Army (Department of the Army)	$5,786,501	0.4%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
51	Avanti Corporation Top agencies EPA (Environmental Protection Agency) DOI (Department of the Interior) HHS (Department of Health and Human Services)	$5,763,720	0.4%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; up 115 since FY2023.
52	Signature Science, LLC Top agencies DHS (Department of Homeland Security) DFAS (Defense Finance and Accounting Service)	$5,672,587	0.4%	Rank history: not on the FY2021–FY2023 lists and #33 in FY2025; new.
53	Jacobs Government Services Company Through Jacobs Engineering Group Inc. Top agencies Army (Department of the Army)	$5,645,900	0.4%	Rank history: not on the FY2021–FY2023 lists and #41 in FY2025; new.
54	Research Planning, Inc. Top agencies Commerce (Department of Commerce) DOI (Department of the Interior) DOT (Department of Transportation)	$5,576,886	0.4%	Rank history: not on the FY2021–FY2023 lists and #77 in FY2025; up 48 since FY2023.
55	Solv LLC Top agencies DHS (Department of Homeland Security) Commerce (Department of Commerce) DOE (Department of Energy)	$5,171,882	0.3%	Rank history: #68 in FY2021, #52 in FY2022, #9 in FY2023 and not on the FY2025 list; down 46 since FY2023.
56	Ahtna Solutions, LLC Top agencies USAF (Department of the Air Force) Commerce (Department of Commerce) DOT (Department of Transportation)	$5,138,213	0.3%	Rank history: not on the FY2021–FY2023 lists and #65 in FY2025; up 47 since FY2023.
57	ABT Global LLC Top agencies EPA (Environmental Protection Agency)	$5,127,246	0.3%	Rank history: not on the FY2021–FY2023 lists and #79 in FY2025; new.
58	WSP USA Environment & Infrastructure Inc. Top agencies EPA (Environmental Protection Agency) USDA (Department of Agriculture) National Gallery of Art	$5,093,570	0.3%	Rank history: not on the FY2021–FY2023 lists and #13 in FY2025; up 105 since FY2023.
59	C.j. Seto Support Services, LLC Top agencies Army (Department of the Army) Navy (Department of the Navy) NASA (National Aeronautics and Space Administration)	$5,068,774	0.3%	Rank history: #66 in FY2021, #72 in FY2022, #88 in FY2023 and not on the FY2025 list; up 29 since FY2023.
60	Oneida Environmental, LLC Top agencies USAF (Department of the Air Force) DOI (Department of the Interior)	$5,057,698	0.3%	Rank history: not on the FY2021–FY2023 lists and #89 in FY2025; new.
61	Vanasse Hangen Brustlin Inc. Top agencies DOI (Department of the Interior) DOT (Department of Transportation)	$4,993,698	0.3%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
62	Umyuaq Consulting Group, LLC Top agencies Army (Department of the Army)	$4,838,352	0.3%	Rank history: #46 in FY2021, #19 in FY2022, #48 in FY2023 and not on the FY2025 list; down 14 since FY2023.
63	Vernadero Group Inc. Top agencies Army (Department of the Army) USAF (Department of the Air Force) DOI (Department of the Interior)	$4,804,336	0.3%	Rank history: not on the FY2021–FY2023 lists and #17 in FY2025; up 93 since FY2023.
64	Applied Environmental Inc. Top agencies WHS (DOD Washington Headquarters Service)	$4,729,811	0.3%	Rank history: not on the FY2021–FY2022 lists, #52 in FY2023 and #55 in FY2025; down 12 since FY2023.
65	Association of Consultants and Engineers Top agencies Navy (Department of the Navy)	$4,707,354	0.3%	Rank history: #44 in FY2021, #61 in FY2022, #31 in FY2023 and #70 in FY2025; down 34 since FY2023.
66	Horsley Witten Group, Inc. Top agencies EPA (Environmental Protection Agency) Commerce (Department of Commerce)	$4,638,884	0.3%	Rank history: #40 in FY2021, #70 in FY2022, #61 in FY2023 and not on the FY2025 list; down 5 since FY2023.
67	Haztrain Inc. Top agencies USAF (Department of the Air Force) EPA (Environmental Protection Agency) Navy (Department of the Navy)	$4,497,184	0.3%	Rank history: not on the FY2021–FY2023 lists and #48 in FY2025; up 317 since FY2023.
68	Guidehouse Inc. Through Aptim Federal Services, LLC Top agencies DOI (Department of the Interior)	$4,442,601	0.3%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
69	Environmental Compliance Consultants, Inc. Top agencies USAF (Department of the Air Force) Navy (Department of the Navy) VA (Department of Veterans Affairs)	$4,441,382	0.3%	Rank history: not on the FY2021–FY2023 lists and #15 in FY2025; up 54 since FY2023.
70	Neptune and Company, Incorporated Top agencies DOE (Department of Energy) EPA (Environmental Protection Agency) Army (Department of the Army)	$4,423,212	0.3%	Rank history: not on the FY2021–FY2022 lists, #58 in FY2023 and #46 in FY2025; down 12 since FY2023.
71	Aleut Technical Services, LLC Top agencies EPA (Environmental Protection Agency)	$4,371,915	0.3%	Rank history: not on the FY2021–FY2022 lists, #100 in FY2023 and #96 in FY2025; up 29 since FY2023.
72	MBK Engineers Top agencies DOI (Department of the Interior)	$4,361,417	0.3%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; up 236 since FY2023.
73	Recon Environmental,Inc. Top agencies DHS (Department of Homeland Security)	$4,321,657	0.3%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; up 114 since FY2023.
74	Paleowest LLC Top agencies DOI (Department of the Interior) Army (Department of the Army) USDA (Department of Agriculture)	$4,320,908	0.3%	Rank history: #41 in FY2021, #60 in FY2022, not on the FY2023 list and #72 in FY2025; up 210 since FY2023.
75	Environmental Management Support, Inc. Top agencies EPA (Environmental Protection Agency) DOI (Department of the Interior)	$4,266,037	0.3%	Rank history: #69 in FY2021, #96 in FY2022, #77 in FY2023 and #56 in FY2025; up 2 since FY2023.
76	Dpra Incorporated Top agencies USAF (Department of the Air Force) EPA (Environmental Protection Agency) DOI (Department of the Interior)	$4,250,039	0.3%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; up 115 since FY2023.
77	The Sanborn Map Company, Inc. Top agencies USDA (Department of Agriculture)	$4,138,286	0.3%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
78	Wood Environment & Infrastructure Solutions Inc. Through WSP USA Environment & Infrastructure Inc. Top agencies EPA (Environmental Protection Agency) GSA (General Services Administration) DOI (Department of the Interior)	$4,064,763	0.3%	Rank history: #11 in FY2021, #62 in FY2022, #25 in FY2023 and not on the FY2025 list; down 53 since FY2023.
79	Ati-Endyna JV, LLC Top agencies WHS (DOD Washington Headquarters Service)	$4,015,763	0.3%	Rank history: #75 in FY2021, #78 in FY2022, #96 in FY2023 and not on the FY2025 list; up 17 since FY2023.
80	Merrick & Company Top agencies DHS (Department of Homeland Security)	$4,006,112	0.3%	Rank history: not on the FY2021–FY2023 lists and #54 in FY2025; new.
81	Cherokee Nation Management & Consulting, L.l.c.. Top agencies DOI (Department of the Interior) USAF (Department of the Air Force)	$3,964,850	0.3%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
82	Whitetail Ayuda Joint Venture LLC Top agencies USAF (Department of the Air Force) Army (Department of the Army)	$3,895,278	0.2%	Rank history: not on the FY2021–FY2023 lists and #100 in FY2025; new.
83	Dewberry Engineers Inc. Top agencies DOT (Department of Transportation) USDA (Department of Agriculture) DOI (Department of the Interior)	$3,764,895	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
84	Tahkox E2-Whitetail LLC Top agencies Army (Department of the Army)	$3,731,749	0.2%	Rank history: not on the FY2021–FY2023 lists and #53 in FY2025; new.
85	Spatial Front Inc Top agencies Commerce (Department of Commerce)	$3,723,466	0.2%	Rank history: not on the FY2021–FY2022 lists, #70 in FY2023 and #94 in FY2025; down 15 since FY2023.
86	Air Resource Specialists, Inc. Top agencies DOI (Department of the Interior) USDA (Department of Agriculture) EPA (Environmental Protection Agency)	$3,688,412	0.2%	Rank history: #81 in FY2021, #86 in FY2022, #69 in FY2023 and #98 in FY2025; down 17 since FY2023.
87	Toeroek Associates, Inc. Top agencies EPA (Environmental Protection Agency) DOI (Department of the Interior) USDA (Department of Agriculture)	$3,626,477	0.2%	Rank history: #56 in FY2021, #18 in FY2022, #29 in FY2023 and #84 in FY2025; down 58 since FY2023.
88	Spackman Mossop Michaels, LLC Top agencies EPA (Environmental Protection Agency)	$3,622,870	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
89	Earth Smart Environmental Solutions LLC Top agencies VA (Department of Veterans Affairs) DOI (Department of the Interior) USDA (Department of Agriculture)	$3,546,680	0.2%	Rank history: #100 in FY2021, #98 in FY2022, not on the FY2023 list and #91 in FY2025; up 60 since FY2023.
90	Environmental Science Corporation Top agencies Navy (Department of the Navy) Army (Department of the Army)	$3,542,665	0.2%	Rank history: #67 in FY2021, not on the FY2022–FY2023 lists and not on the FY2025 list; up 39 since FY2023.
91	Rmec Environmental Inc Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$3,535,539	0.2%	Rank history: not on the FY2021–FY2022 lists, #98 in FY2023 and #76 in FY2025; up 7 since FY2023.
92	1Stmission LLC Top agencies Commerce (Department of Commerce)	$3,527,810	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
93	Hikina 2 Komohana Consulting Inc. Top agencies Army (Department of the Army)	$3,491,970	0.2%	Rank history: #82 in FY2021, #80 in FY2022, #93 in FY2023 and not on the FY2025 list; unchanged since FY2023.
94	Hdr, Inc. Through HDR Environmental, Operations and Construction, Inc. Top agencies Army (Department of the Army) DHS (Department of Homeland Security)	$3,486,499	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; up 37 since FY2023.
95	Genwest Systems Inc. Top agencies Commerce (Department of Commerce)	$3,453,475	0.2%	Rank history: #25 in FY2021, #25 in FY2022, #41 in FY2023 and #43 in FY2025; down 54 since FY2023.
96	Cardinal Point Captains Inc Top agencies Commerce (Department of Commerce) DOI (Department of the Interior)	$3,419,975	0.2%	Rank history: not on the FY2021–FY2022 lists, #79 in FY2023 and #82 in FY2025; down 17 since FY2023.
97	Cherokee Federal Solutions, L.L.C. Top agencies Army (Department of the Army)	$3,414,710	0.2%	Rank history: not on the FY2021–FY2023 lists and #68 in FY2025; new.
98	NDN Otie JV, LLC Top agencies USAF (Department of the Air Force)	$3,341,766	0.2%	Rank history: not on the FY2021–FY2023 lists and #78 in FY2025; up 24 since FY2023.
99	Scout Environmental, Inc. Top agencies VA (Department of Veterans Affairs) DOI (Department of the Interior)	$3,297,678	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; up 217 since FY2023.
100	Ciri Development Corporation 2 awardees, including North Wind Resource Consulting LLC Top agencies Army (Department of the Army) USDA (Department of Agriculture)	$3,217,805	0.2%	Rank history: not on the FY2021–FY2022 lists, #34 in FY2023 and #36 in FY2025; down 66 since FY2023.

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100 of 1,071 contractors listed here. See the rest on GovTribe.

Rankings for the codes under NAICS 54162

Code	Net obligations	Largest contractor
541620 Environmental Consulting Services	$1,450,763,858	Eastern Research Group Inc.

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 $1.56 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 54162 contractors in FY2024?

1. Eastern Research Group Inc. ($107M), 2. Tetra Tech, Inc. ($99.7M), 3. The Cadmus Group LLC ($95.2M), 4. Project Enhancement Corporation ($48.5M), 5. S C & A Inc. ($41.4M), 6. Weston Solutions Holdings, Inc. ($37.6M), 7. General Dynamics Corporation ($37.5M), 8. Lynker Corporation ($33.8M), 9. CDM Federal Programs Corporation ($24.7M), 10. Consolidated Safety Services Incorporated ($21.6M).

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