Top 100 Contractors in NAICS 541620: Environmental Consulting Services, FY2025

Name: Top 100 Contractors in NAICS 541620: Environmental Consulting Services, FY2025
Creator: GovTribe

Parent companies by net contract obligations Oct 1, 2024 – Sep 30, 2025 Code page on GovTribe

The top 10 won 34% of FY2025 NAICS 541620 contract dollars

Contract obligations: $1,138,602,313 Net of deobligations, by contracts coded NAICS 541620
Contractors: 810 Parent companies with an obligation
Largest contractor: Tetra Tech, Inc. $103 million, 7.7% 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	Tetra Tech, Inc. 12 awardees Top agencies EPA (Environmental Protection Agency) NASA (National Aeronautics and Space Administration) Army (Department of the Army)	$103,041,390	7.7%	Rank history: #1 in FY2021, #1 in FY2022, #1 in FY2023 and #2 in FY2024; up 1 since FY2024.
2	Weston Solutions Holdings, Inc. 5 awardees, including Weston Solutions Inc. Top agencies EPA (Environmental Protection Agency) DOT (Department of Transportation)	$90,573,656	6.8%	Rank history: #6 in FY2021, #6 in FY2022, #6 in FY2023 and #6 in FY2024; up 4 since FY2024.
3	Eastern Research Group Inc. Top agencies EPA (Environmental Protection Agency) DOI (Department of the Interior) USDA (Department of Agriculture)	$64,563,327	4.8%	Rank history: #3 in FY2021, #2 in FY2022, #2 in FY2023 and #1 in FY2024; down 2 since FY2024.
4	Project Enhancement Corporation Top agencies DOE (Department of Energy)	$48,281,552	3.6%	Rank history: #4 in FY2021, #4 in FY2022, #3 in FY2023 and #4 in FY2024; unchanged since FY2024.
5	Lynker Corporation Top agencies Commerce (Department of Commerce)	$44,901,614	3.4%	Rank history: #15 in FY2021, #9 in FY2022, #8 in FY2023 and #8 in FY2024; up 3 since FY2024.
6	S C & A Inc. Top agencies EPA (Environmental Protection Agency) DOI (Department of the Interior) DOE (Department of Energy)	$37,749,920	2.8%	Rank history: #48 in FY2021, #47 in FY2022, #33 in FY2023 and #5 in FY2024; down 1 since FY2024.
7	Gulf South Research Corp Top agencies DHS (Department of Homeland Security) Army (Department of the Army) USAF (Department of the Air Force)	$16,197,270	1.2%	Rank history: not on the FY2021–FY2024 lists; new.
8	Rpi-Css, LLC Top agencies Commerce (Department of Commerce)	$15,122,613	1.1%	Rank history: not on the FY2021–FY2024 lists; new.
9	General Dynamics Corporation Through General Dynamics Information Technology, Inc. Top agencies EPA (Environmental Protection Agency)	$13,853,929	1.0%	Rank history: #32 in FY2021, not on the FY2022 list, #37 in FY2023 and #7 in FY2024; down 2 since FY2024.
10	Environmental Assessment Services, LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$13,777,677	1.0%	Rank history: not on the FY2021–FY2023 lists and #49 in FY2024; up 39 since FY2024.
11	Jacobs Geosyntec A Joint Venture Top agencies NASA (National Aeronautics and Space Administration)	$13,458,085	1.0%	Rank history: not on the FY2021–FY2024 lists; up 119 since FY2024.
12	Gryphon Environmental, LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force) Navy (Department of the Navy)	$13,235,182	1.0%	Rank history: #22 in FY2021, #16 in FY2022, #19 in FY2023 and #17 in FY2024; up 5 since FY2024.
13	WSP USA Environment & Infrastructure Inc. Top agencies EPA (Environmental Protection Agency) DOI (Department of the Interior)	$12,688,344	1.0%	Rank history: not on the FY2021–FY2023 lists and #58 in FY2024; up 45 since FY2024.
14	The Solution Foundry, LLC Top agencies USAF (Department of the Air Force) Army (Department of the Army)	$12,672,426	1.0%	Rank history: #24 in FY2021, #14 in FY2022, #24 in FY2023 and #18 in FY2024; up 4 since FY2024.
15	Environmental Compliance Consultants, Inc. Top agencies Army (Department of the Army) USAF (Department of the Air Force) Navy (Department of the Navy)	$12,664,762	1.0%	Rank history: not on the FY2021–FY2023 lists and #69 in FY2024; up 54 since FY2024.
16	Bluestone Environmental Group, Inc. Top agencies Army (Department of the Army) NASA (National Aeronautics and Space Administration) EPA (Environmental Protection Agency)	$12,599,806	0.9%	Rank history: #86 in FY2021, #48 in FY2022, #36 in FY2023 and #24 in FY2024; up 8 since FY2024.
17	Vernadero Group Inc. Top agencies DHS (Department of Homeland Security) Army (Department of the Army) USAF (Department of the Air Force)	$11,930,415	0.9%	Rank history: not on the FY2021–FY2023 lists and #63 in FY2024; up 46 since FY2024.
18	Absg Consulting Inc. Top agencies DOT (Department of Transportation)	$11,555,126	0.9%	Rank history: not on the FY2021–FY2024 lists; new.
19	The Cadmus Group LLC Top agencies EPA (Environmental Protection Agency) DHS (Department of Homeland Security) USAID (US Agency for International Development)	$11,026,470	0.8%	Rank history: not on the FY2021 list, #17 in FY2022, #4 in FY2023 and #3 in FY2024; down 16 since FY2024.
20	Weston-Techlaw JV LLC Top agencies EPA (Environmental Protection Agency)	$10,772,588	0.8%	Rank history: not on the FY2021 list, #30 in FY2022, #14 in FY2023 and #16 in FY2024; down 4 since FY2024.
21	Hsg, LLC Top agencies NASA (National Aeronautics and Space Administration) USAF (Department of the Air Force) DOI (Department of the Interior)	$10,652,054	0.8%	Rank history: #50 in FY2021, #40 in FY2022, #53 in FY2023 and #36 in FY2024; up 15 since FY2024.
22	Consolidated Safety Services Incorporated Top agencies Commerce (Department of Commerce) HHS (Department of Health and Human Services) EPA (Environmental Protection Agency)	$10,093,165	0.8%	Rank history: #14 in FY2021, #11 in FY2022, #10 in FY2023 and #10 in FY2024; down 12 since FY2024.
23	Marstel-Day, LLC Top agencies Navy (Department of the Navy) DOI (Department of the Interior) USAF (Department of the Air Force)	$10,065,486	0.8%	Rank history: not on the FY2021 list, #41 in FY2022, #17 in FY2023 and #20 in FY2024; down 3 since FY2024.
24	Independent Strategic Management Solutions Inc Top agencies DOE (Department of Energy)	$10,040,383	0.8%	Rank history: not on the FY2021–FY2023 lists and #44 in FY2024; up 20 since FY2024.
25	Golder Europe Service Centre SRL 5 awardees, including WSP USA Solutions Inc., Louis Berger Kyowa JV and WSP Italia S.R.L. Top agencies DOE (Department of Energy) DOT (Department of Transportation) Army (Department of the Army)	$8,810,700	0.7%	Rank history: not on the FY2021–FY2023 lists and #13 in FY2024; down 12 since FY2024.
26	Chenega Reliable Services LLC Top agencies USAF (Department of the Air Force) Army (Department of the Army)	$8,570,748	0.6%	Rank history: not on the FY2021–FY2023 lists and #26 in FY2024; unchanged since FY2024.
27	Stantec Inc. 3 awardees, including Stantec Consulting Services Inc. and Stantec GS Inc. Top agencies DOI (Department of the Interior) HHS (Department of Health and Human Services) GSA (General Services Administration)	$8,219,376	0.6%	Rank history: not on the FY2021–FY2022 lists, #60 in FY2023 and not on the FY2024 list; up 109 since FY2024.
28	DR Reed & Associates, Inc. Top agencies DOI (Department of the Interior) Army (Department of the Army)	$6,946,567	0.5%	Rank history: not on the FY2021–FY2024 lists; new.
29	Pinyon-Sundance JV, LLC Top agencies DOT (Department of Transportation)	$6,844,483	0.5%	Rank history: not on the FY2021–FY2024 lists; new.
30	Dawson Mcg, Inc. Top agencies DHS (Department of Homeland Security) Army (Department of the Army)	$6,791,187	0.5%	Rank history: not on the FY2021–FY2024 lists; up 153 since FY2024.
31	Aerostar Environmental and Construction LLC Top agencies Army (Department of the Army)	$6,740,850	0.5%	Rank history: not on the FY2021 list, #49 in FY2022, #35 in FY2023 and #37 in FY2024; up 6 since FY2024.
32	GV Henson Creek LLC Top agencies DHS (Department of Homeland Security)	$6,658,663	0.5%	Rank history: not on the FY2021–FY2024 lists; new.
33	Signature Science, LLC Top agencies DFAS (Defense Finance and Accounting Service) DHS (Department of Homeland Security)	$6,594,114	0.5%	Rank history: not on the FY2021–FY2023 lists and #52 in FY2024; up 19 since FY2024.
34	Environmental Incentives, Inc. Top agencies USAID (US Agency for International Development)	$6,431,886	0.5%	Rank history: #5 in FY2021, #5 in FY2022, #7 in FY2023 and #11 in FY2024; down 23 since FY2024.
35	Semanticbits LLC Through ICF Incorporated, L.L.C. Top agencies EPA (Environmental Protection Agency) DOT (Department of Transportation)	$6,227,332	0.5%	Rank history: not on the FY2021–FY2023 lists and #22 in FY2024; down 13 since FY2024.
36	Ciri Development Corporation Through North Wind Resource Consulting LLC Top agencies DOI (Department of the Interior) Army (Department of the Army) USDA (Department of Agriculture)	$6,024,362	0.5%	Rank history: not on the FY2021–FY2022 lists, #34 in FY2023 and #100 in FY2024; up 64 since FY2024.
37	Great Lakes Environmental Center, Inc. Top agencies EPA (Environmental Protection Agency) Army (Department of the Army) USDA (Department of Agriculture)	$6,014,057	0.5%	Rank history: #60 in FY2021, #24 in FY2022, #23 in FY2023 and #21 in FY2024; down 16 since FY2024.
38	Copperhead Environmental Consulting Inc. Top agencies DOI (Department of the Interior)	$5,922,711	0.4%	Rank history: not on the FY2021–FY2024 lists; up 176 since FY2024.
39	SOL Solutions LLC Top agencies Army (Department of the Army) Navy (Department of the Navy)	$5,876,025	0.4%	Rank history: not on the FY2021–FY2023 lists and #15 in FY2024; down 24 since FY2024.
40	Research Triangle Institute Top agencies EPA (Environmental Protection Agency)	$5,590,717	0.4%	Rank history: #12 in FY2021, #15 in FY2022, #20 in FY2023 and #12 in FY2024; down 28 since FY2024.
41	Jacobs Government Services Company Through Jacobs Engineering Group Inc. Top agencies Army (Department of the Army) DOI (Department of the Interior)	$5,509,734	0.4%	Rank history: not on the FY2021–FY2023 lists and #53 in FY2024; up 12 since FY2024.
42	Chemonics International, Inc. Top agencies USAID (US Agency for International Development)	$5,478,110	0.4%	Rank history: not on the FY2021–FY2022 lists, #45 in FY2023 and #23 in FY2024; down 19 since FY2024.
43	Genwest Systems Inc. Top agencies Commerce (Department of Commerce)	$5,269,806	0.4%	Rank history: #25 in FY2021, #25 in FY2022, #41 in FY2023 and #95 in FY2024; up 52 since FY2024.
44	Integrated Systems Solutions, Inc. Top agencies Commerce (Department of Commerce)	$5,006,013	0.4%	Rank history: #71 in FY2021, #50 in FY2022, #75 in FY2023 and #38 in FY2024; down 6 since FY2024.
45	Science Applications International Corporation Top agencies EPA (Environmental Protection Agency)	$4,979,138	0.4%	Rank history: #49 in FY2021, #84 in FY2022, #56 in FY2023 and #28 in FY2024; down 17 since FY2024.
46	Neptune and Company, Incorporated Top agencies DOE (Department of Energy) EPA (Environmental Protection Agency) DOI (Department of the Interior)	$4,886,067	0.4%	Rank history: not on the FY2021–FY2022 lists, #58 in FY2023 and #70 in FY2024; up 24 since FY2024.
47	Ocean Associates Inc. Top agencies Commerce (Department of Commerce)	$4,840,327	0.4%	Rank history: #79 in FY2021, #63 in FY2022, #82 in FY2023 and #34 in FY2024; down 13 since FY2024.
48	Haztrain Inc. Top agencies USAF (Department of the Air Force) EPA (Environmental Protection Agency)	$4,804,481	0.4%	Rank history: not on the FY2021–FY2023 lists and #67 in FY2024; up 19 since FY2024.
49	Potomac-Hudson Engineering Inc Top agencies DOE (Department of Energy) GSA (General Services Administration) DOS (Department of State)	$4,776,395	0.4%	Rank history: not on the FY2021–FY2023 lists and #30 in FY2024; down 19 since FY2024.
50	Mabbett & Associates, Inc. Top agencies VA (Department of Veterans Affairs) Army (Department of the Army) GSA (General Services Administration)	$4,731,125	0.4%	Rank history: #37 in FY2021, #39 in FY2022, #39 in FY2023 and #27 in FY2024; down 23 since FY2024.
51	Tehama ECS LLC Top agencies Army (Department of the Army) DOI (Department of the Interior) USAF (Department of the Air Force)	$4,722,891	0.4%	Rank history: not on the FY2021–FY2024 lists; up 52 since FY2024.
52	Sundance Consultants, LLC 2 awardees, including Sundance EA Associates II Top agencies Navy (Department of the Navy) DOI (Department of the Interior) MDA (DOD Missile Defense Agency)	$4,658,002	0.3%	Rank history: not on the FY2021 list, #89 in FY2022, #21 in FY2023 and #41 in FY2024; down 11 since FY2024.
53	Tahkox E2-Whitetail LLC Top agencies Army (Department of the Army)	$4,599,325	0.3%	Rank history: not on the FY2021–FY2023 lists and #84 in FY2024; up 31 since FY2024.
54	Merrick & Company Top agencies DHS (Department of Homeland Security)	$4,596,592	0.3%	Rank history: not on the FY2021–FY2023 lists and #80 in FY2024; up 26 since FY2024.
55	Applied Environmental Inc. Top agencies WHS (DOD Washington Headquarters Service)	$4,565,463	0.3%	Rank history: not on the FY2021–FY2022 lists, #52 in FY2023 and #64 in FY2024; up 9 since FY2024.
56	Environmental Management Support, Inc. Top agencies EPA (Environmental Protection Agency)	$4,518,847	0.3%	Rank history: #69 in FY2021, #96 in FY2022, #77 in FY2023 and #75 in FY2024; up 19 since FY2024.
57	Skeo Solutions, Inc. Top agencies EPA (Environmental Protection Agency)	$4,504,433	0.3%	Rank history: #70 in FY2021, #10 in FY2022, #16 in FY2023 and #14 in FY2024; down 43 since FY2024.
58	Dgi-Ati II LLC Top agencies WHS (DOD Washington Headquarters Service) Army (Department of the Army)	$4,485,914	0.3%	Rank history: not on the FY2021–FY2024 lists; up 240 since FY2024.
59	Q & A Diversified LLC Top agencies Army (Department of the Army)	$4,417,901	0.3%	Rank history: not on the FY2021–FY2024 lists; up 132 since FY2024.
60	LMI Consulting, LLC Top agencies DHS (Department of Homeland Security)	$4,380,004	0.3%	Rank history: not on the FY2021–FY2024 lists; new.
61	AECOM Technical Services, Inc. Top agencies NASA (National Aeronautics and Space Administration) Commerce (Department of Commerce)	$4,243,912	0.3%	Rank history: not on the FY2021–FY2023 lists and #35 in FY2024; down 26 since FY2024.
62	Propel Solutions LLC Top agencies Commerce (Department of Commerce)	$4,140,501	0.3%	Rank history: not on the FY2021–FY2024 lists; up 98 since FY2024.
63	Earth Resources Technology, LLC Top agencies Commerce (Department of Commerce)	$4,102,087	0.3%	Rank history: not on the FY2021–FY2022 lists, #73 in FY2023 and not on the FY2024 list; up 41 since FY2024.
64	Straughan Environmental, Inc. Top agencies NASA (National Aeronautics and Space Administration)	$4,097,805	0.3%	Rank history: #62 in FY2021, #71 in FY2022, #59 in FY2023 and #32 in FY2024; down 32 since FY2024.
65	Ahtna Solutions, LLC Top agencies USAF (Department of the Air Force) Commerce (Department of Commerce)	$4,047,743	0.3%	Rank history: not on the FY2021–FY2023 lists and #56 in FY2024; down 9 since FY2024.
66	Environmental Research Group LLC Top agencies Army (Department of the Army) Navy (Department of the Navy) WHS (DOD Washington Headquarters Service)	$4,039,072	0.3%	Rank history: not on the FY2021–FY2022 lists, #38 in FY2023 and #43 in FY2024; down 23 since FY2024.
67	Bering Straits Native Corporation Through Stampede Ventures, Inc. Top agencies DOI (Department of the Interior)	$4,016,787	0.3%	Rank history: #73 in FY2021, not on the FY2022 list, #62 in FY2023 and not on the FY2024 list; up 132 since FY2024.
68	Cherokee Federal Solutions, L.L.C. Top agencies Army (Department of the Army)	$3,938,690	0.3%	Rank history: not on the FY2021–FY2023 lists and #97 in FY2024; up 29 since FY2024.
69	Specpro Sustainment and Environmental, LLC Top agencies DOI (Department of the Interior) Army (Department of the Army)	$3,930,830	0.3%	Rank history: not on the FY2021–FY2024 lists; up 45 since FY2024.
70	Association of Consultants and Engineers Top agencies Navy (Department of the Navy)	$3,706,717	0.3%	Rank history: #44 in FY2021, #61 in FY2022, #31 in FY2023 and #65 in FY2024; down 5 since FY2024.
71	Southeastern Archaeological Research Inc. Top agencies Army (Department of the Army)	$3,687,448	0.3%	Rank history: not on the FY2021–FY2024 lists; up 93 since FY2024.
72	Paleowest LLC Top agencies DOI (Department of the Interior) Army (Department of the Army) USDA (Department of Agriculture)	$3,680,399	0.3%	Rank history: #41 in FY2021, #60 in FY2022, not on the FY2023 list and #74 in FY2024; up 2 since FY2024.
73	ECO & Associates, Inc. Top agencies Army (Department of the Army) DOI (Department of the Interior)	$3,615,600	0.3%	Rank history: #17 in FY2021, #21 in FY2022 and not on the FY2023–FY2024 lists; up 115 since FY2024.
74	Verina-Renova JV LLC Top agencies DHS (Department of Homeland Security) Army (Department of the Army)	$3,520,264	0.3%	Rank history: not on the FY2021–FY2024 lists; up 80 since FY2024.
75	SRC Inc. Top agencies EPA (Environmental Protection Agency)	$3,509,905	0.3%	Rank history: #23 in FY2021, #23 in FY2022, #32 in FY2023 and #29 in FY2024; down 46 since FY2024.
76	Rmec Environmental Inc Top agencies Army (Department of the Army) DOI (Department of the Interior)	$3,487,597	0.3%	Rank history: not on the FY2021–FY2022 lists, #98 in FY2023 and #91 in FY2024; up 15 since FY2024.
77	Research Planning, Inc. Top agencies Commerce (Department of Commerce) DOJ (Department of Justice)	$3,486,475	0.3%	Rank history: not on the FY2021–FY2023 lists and #54 in FY2024; down 23 since FY2024.
78	NDN Otie JV, LLC Top agencies USAF (Department of the Air Force)	$3,406,943	0.3%	Rank history: not on the FY2021–FY2023 lists and #98 in FY2024; up 20 since FY2024.
79	ABT Global LLC Top agencies EPA (Environmental Protection Agency)	$3,371,061	0.3%	Rank history: not on the FY2021–FY2023 lists and #57 in FY2024; down 22 since FY2024.
80	Environmental Science Services Inc. Top agencies Army (Department of the Army)	$3,324,853	0.2%	Rank history: not on the FY2021–FY2024 lists; new.
81	Koman ECO Ageiss JV LLC Top agencies USAF (Department of the Air Force) Army (Department of the Army)	$3,305,423	0.2%	Rank history: not on the FY2021–FY2024 lists; up 35 since FY2024.
82	Cardinal Point Captains Inc Top agencies Commerce (Department of Commerce)	$3,292,919	0.2%	Rank history: not on the FY2021–FY2022 lists, #79 in FY2023 and #96 in FY2024; up 14 since FY2024.
83	Trinity Analysis and Development Corp. Top agencies USAF (Department of the Air Force)	$3,257,662	0.2%	Rank history: not on the FY2021–FY2024 lists; up 166 since FY2024.
84	Toeroek Associates, Inc. Top agencies EPA (Environmental Protection Agency)	$3,254,415	0.2%	Rank history: #56 in FY2021, #18 in FY2022, #29 in FY2023 and #87 in FY2024; up 3 since FY2024.
85	Melwood Horticultural Training Center, Inc. Top agencies DOJ (Department of Justice)	$3,251,925	0.2%	Rank history: not on the FY2021 list, #95 in FY2022 and not on the FY2023–FY2024 lists; up 17 since FY2024.
86	First Environment Inc. Top agencies Army (Department of the Army) VA (Department of Veterans Affairs) USAF (Department of the Air Force)	$3,201,362	0.2%	Rank history: #42 in FY2021, not on the FY2022–FY2023 lists and #42 in FY2024; down 44 since FY2024.
87	Brice Solutions, LLC Top agencies DHS (Department of Homeland Security) Army (Department of the Army)	$3,159,421	0.2%	Rank history: not on the FY2021–FY2023 lists and #39 in FY2024; down 48 since FY2024.
88	Property & Environmental Management Inc. Top agencies HHS (Department of Health and Human Services)	$3,143,913	0.2%	Rank history: not on the FY2021–FY2023 lists and #45 in FY2024; down 43 since FY2024.
89	Oneida Environmental, LLC Top agencies USAF (Department of the Air Force) DOI (Department of the Interior) Army (Department of the Army)	$3,057,094	0.2%	Rank history: not on the FY2021–FY2023 lists and #60 in FY2024; down 29 since FY2024.
90	Ardl Inc. Top agencies Army (Department of the Army) EPA (Environmental Protection Agency)	$2,925,037	0.2%	Rank history: #9 in FY2021, #99 in FY2022, #46 in FY2023 and not on the FY2024 list; up 219 since FY2024.
91	Earth Smart Environmental Solutions LLC Top agencies VA (Department of Veterans Affairs)	$2,866,155	0.2%	Rank history: #100 in FY2021, #98 in FY2022, not on the FY2023 list and #89 in FY2024; down 2 since FY2024.
92	Renova-Sovereign Joint Venture Top agencies Army (Department of the Army)	$2,832,658	0.2%	Rank history: #45 in FY2021, #59 in FY2022 and not on the FY2023–FY2024 lists; up 27 since FY2024.
93	Rural Community Assistance Corporation Top agencies EPA (Environmental Protection Agency) HHS (Department of Health and Human Services)	$2,715,983	0.2%	Rank history: not on the FY2021–FY2024 lists; up 137 since FY2024.
94	Spatial Front Inc Top agencies Commerce (Department of Commerce)	$2,706,929	0.2%	Rank history: not on the FY2021–FY2022 lists, #70 in FY2023 and #85 in FY2024; down 9 since FY2024.
95	Anamar Environmental Consulting, Inc. Top agencies Army (Department of the Army)	$2,689,996	0.2%	Rank history: not on the FY2021–FY2024 lists; new.
96	Aleut Technical Services, LLC Top agencies EPA (Environmental Protection Agency)	$2,597,986	0.2%	Rank history: not on the FY2021–FY2022 lists, #100 in FY2023 and #71 in FY2024; down 25 since FY2024.
97	Alpha Facilities Solutions LLC Top agencies Army (Department of the Army) Navy (Department of the Navy) USDA (Department of Agriculture)	$2,591,504	0.2%	Rank history: not on the FY2021–FY2024 lists; up 26 since FY2024.
98	Air Resource Specialists, Inc. Top agencies DOI (Department of the Interior) EPA (Environmental Protection Agency)	$2,584,562	0.2%	Rank history: #81 in FY2021, #86 in FY2022, #69 in FY2023 and #86 in FY2024; down 12 since FY2024.
99	Whitetail Environmental, LLC Top agencies Army (Department of the Army) DOI (Department of the Interior)	$2,576,764	0.2%	Rank history: #91 in FY2021, #37 in FY2022, #40 in FY2023 and #40 in FY2024; down 59 since FY2024.
100	Whitetail Ayuda Joint Venture LLC Top agencies Army (Department of the Army)	$2,430,694	0.2%	Rank history: not on the FY2021–FY2023 lists and #82 in FY2024; down 18 since FY2024.

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100 of 810 contractors listed here. See the rest on GovTribe.

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 $1.33 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 2025 ran Oct 1, 2024 – Sep 30, 2025. 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 FY2024. "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 FY2024 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 541620 contractors in FY2025?

1. Tetra Tech, Inc. ($103M), 2. Weston Solutions Holdings, Inc. ($90.6M), 3. Eastern Research Group Inc. ($64.6M), 4. Project Enhancement Corporation ($48.3M), 5. Lynker Corporation ($44.9M), 6. S C & A Inc. ($37.7M), 7. Gulf South Research Corp ($16.2M), 8. Rpi-Css, LLC ($15.1M), 9. General Dynamics Corporation ($13.9M), 10. Environmental Assessment Services, LLC ($13.8M).

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