Top 100 Contractors in NAICS 54162: Environmental Consulting Services, FY2021

Name: Top 100 Contractors in NAICS 54162: Environmental Consulting Services, FY2021
Creator: GovTribe

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

The top 10 won 27% of FY2021 NAICS 54162 contract dollars

Contract obligations: $1,017,612,128 Net of deobligations, by contracts coded NAICS 54162 or a code under it
Contractors: 1,045 Parent companies with an obligation
Largest contractor: Tetra Tech, Inc. $64.6 million, 5.7% 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. 17 awardees Top agencies EPA (Environmental Protection Agency) NASA (National Aeronautics and Space Administration) DOE (Department of Energy)	$64,589,511	5.7%	Rank history: #1 in FY2022, #1 in FY2023, #2 in FY2024 and #1 in FY2025; unchanged since FY2020.
2	Boston Government Services, LLC Top agencies DOE (Department of Energy)	$38,974,274	3.4%	Rank history: #3 in FY2022, #5 in FY2023 and not on the FY2024–FY2025 lists; up 2 since FY2020.
3	Eastern Research Group Inc. Top agencies EPA (Environmental Protection Agency) DOL (Department of Labor) USDA (Department of Agriculture)	$38,049,446	3.4%	Rank history: #2 in FY2022, #2 in FY2023, #1 in FY2024 and #3 in FY2025; unchanged since FY2020.
4	Project Enhancement Corporation Top agencies DOE (Department of Energy) DOL (Department of Labor)	$37,003,777	3.3%	Rank history: #4 in FY2022, #3 in FY2023, #4 in FY2024 and #4 in FY2025; down 2 since FY2020.
5	Environmental Incentives, Inc. Top agencies USAID (US Agency for International Development)	$30,810,537	2.7%	Rank history: #5 in FY2022, #7 in FY2023, #11 in FY2024 and #34 in FY2025; up 4 since FY2020.
6	Weston Solutions Holdings, Inc. 4 awardees, including Weston Solutions Inc. Top agencies EPA (Environmental Protection Agency) DOT (Department of Transportation)	$28,898,630	2.6%	Rank history: #6 in FY2022, #6 in FY2023, #6 in FY2024 and #2 in FY2025; up 1 since FY2020.
7	Sol Solutions, LLC Top agencies Army (Department of the Army) Navy (Department of the Navy)	$21,589,953	1.9%	Rank history: #8 in FY2022, #12 in FY2023 and not on the FY2024–FY2025 lists; up 1 since FY2020.
8	ICF International, Inc. Through ICF Incorporated, L.L.C. Top agencies EPA (Environmental Protection Agency) DOT (Department of Transportation) DOI (Department of the Interior)	$19,844,359	1.8%	Rank history: #7 in FY2022, #13 in FY2023, #19 in FY2024 and not on the FY2025 list; up 49 since FY2020.
9	Ardl Inc. Top agencies EPA (Environmental Protection Agency) Army (Department of the Army)	$14,934,876	1.3%	Rank history: #99 in FY2022, #46 in FY2023, not on the FY2024 list and #90 in FY2025; up 1 since FY2020.
10	Versar Inc. 2 awardees Top agencies Army (Department of the Army) EPA (Environmental Protection Agency) HHS (Department of Health and Human Services)	$14,326,692	1.3%	Rank history: #53 in FY2022 and not on the FY2023–FY2025 lists; down 4 since FY2020.
11	Wood Environment & Infrastructure Solutions Inc. 2 awardees, including WSP USA Environment & Infrastructure Inc. and WSP E&Is GMBH Top agencies EPA (Environmental Protection Agency) USAF (Department of the Air Force) Army (Department of the Army)	$13,905,946	1.2%	Rank history: #62 in FY2022, #25 in FY2023, #78 in FY2024 and not on the FY2025 list; up 17 since FY2020.
12	Research Triangle Institute Top agencies EPA (Environmental Protection Agency)	$13,739,499	1.2%	Rank history: #15 in FY2022, #20 in FY2023, #12 in FY2024 and #40 in FY2025; up 2 since FY2020.
13	BTP Services, LLC Top agencies DOE (Department of Energy)	$13,081,581	1.2%	Rank history: #13 in FY2022 and not on the FY2023–FY2025 lists; up 5 since FY2020.
14	Consolidated Safety Services Incorporated Top agencies Commerce (Department of Commerce) HHS (Department of Health and Human Services) EPA (Environmental Protection Agency)	$12,698,040	1.1%	Rank history: #11 in FY2022, #10 in FY2023, #10 in FY2024 and #22 in FY2025; down 3 since FY2020.
15	Lynker Corporation Top agencies Commerce (Department of Commerce)	$12,466,875	1.1%	Rank history: #9 in FY2022, #8 in FY2023, #8 in FY2024 and #5 in FY2025; up 83 since FY2020.
16	I.m. Systems Group, Inc. Top agencies Commerce (Department of Commerce)	$12,307,757	1.1%	Rank history: not on the FY2022–FY2025 lists; down 11 since FY2020.
17	ECO & Associates, Inc. Top agencies Army (Department of the Army)	$11,878,112	1.1%	Rank history: #21 in FY2022, not on the FY2023–FY2024 lists and #73 in FY2025; up 4 since FY2020.
18	Leidos Holdings, Inc. 3 awardees, including Leidos, Inc. Top agencies DHS (Department of Homeland Security) DOE (Department of Energy)	$10,161,416	0.9%	Rank history: #42 in FY2022 and not on the FY2023–FY2025 lists; up 119 since FY2020.
19	Stantec Incorporated 3 awardees, including Stantec Consulting Services Inc. Top agencies HHS (Department of Health and Human Services) DOI (Department of the Interior) DOT (Department of Transportation)	$9,471,076	0.8%	Rank history: not on the FY2022–FY2025 lists; up 29 since FY2020.
20	AECOM 4 awardees, including AECOM Technical Services, Inc., AECOM International Inc. and AECOM Italia S.P.A. Top agencies NASA (National Aeronautics and Space Administration) Army (Department of the Army) Commerce (Department of Commerce)	$9,305,081	0.8%	Rank history: #22 in FY2022, #26 in FY2023, #31 in FY2024 and not on the FY2025 list; up 2 since FY2020.
21	Environmental Management & Planning Solutions LLC 2 awardees Top agencies DOI (Department of the Interior) USDA (Department of Agriculture)	$9,302,013	0.8%	Rank history: #12 in FY2022, #11 in FY2023 and not on the FY2024–FY2025 lists; down 8 since FY2020.
22	Gryphon Environmental, LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force) VA (Department of Veterans Affairs)	$9,228,841	0.8%	Rank history: #16 in FY2022, #19 in FY2023, #17 in FY2024 and #12 in FY2025; up 18 since FY2020.
23	SRC Inc. Top agencies EPA (Environmental Protection Agency)	$8,966,019	0.8%	Rank history: #23 in FY2022, #32 in FY2023, #29 in FY2024 and #75 in FY2025; down 8 since FY2020.
24	The Solution Foundry, LLC Top agencies USAF (Department of the Air Force) Army (Department of the Army)	$8,904,080	0.8%	Rank history: #14 in FY2022, #24 in FY2023, #18 in FY2024 and #14 in FY2025; down 12 since FY2020.
25	Genwest Systems Inc. Top agencies Commerce (Department of Commerce)	$8,135,785	0.7%	Rank history: #25 in FY2022, #41 in FY2023, #95 in FY2024 and #43 in FY2025; unchanged since FY2020.
26	Cook Inlet Region Inc. 7 awardees, including North Wind Resource Consulting LLC, OSC Technical Solutions, LLC and North Wind Site Services LLC Top agencies Army (Department of the Army) DOE (Department of Energy) USDA (Department of Agriculture)	$8,007,801	0.7%	Rank history: #29 in FY2022 and not on the FY2023–FY2025 lists; up 1 since FY2020.
27	Mantech-Aecom Joint Venture Top agencies Navy (Department of the Navy) DLA (Defense Logistics Agency)	$7,320,892	0.6%	Rank history: not on the FY2022–FY2025 lists; up 2 since FY2020.
28	Camp Dresser & Mckee Inc. 3 awardees, including CDM Federal Programs Corporation Top agencies DHS (Department of Homeland Security) EPA (Environmental Protection Agency) DOI (Department of the Interior)	$7,039,703	0.6%	Rank history: not on the FY2022–FY2025 lists; up 165 since FY2020.
29	Aptim Federal Services LLC Top agencies EPA (Environmental Protection Agency) DOI (Department of the Interior) Army (Department of the Army)	$7,027,788	0.6%	Rank history: #20 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
30	LRS Federal LLC Top agencies HHS (Department of Health and Human Services) VA (Department of Veterans Affairs) GSA (General Services Administration)	$6,827,846	0.6%	Rank history: #85 in FY2022, #27 in FY2023 and not on the FY2024–FY2025 lists; up 47 since FY2020.
31	Cherokee Nation 4 awardees, including Cherokee Federal Solutions, L.L.C. and Cherokee Nation Management & Consulting, L.l.c.. Top agencies Army (Department of the Army) DOI (Department of the Interior) USAF (Department of the Air Force)	$6,740,123	0.6%	Rank history: not on the FY2022 list, #83 in FY2023 and not on the FY2024–FY2025 lists; up 89 since FY2020.
32	General Dynamics Corporation 3 awardees, including General Dynamics Information Technology Inc. and Csra LLC Top agencies EPA (Environmental Protection Agency)	$6,507,549	0.6%	Rank history: not on the FY2022 list, #37 in FY2023, #7 in FY2024 and #9 in FY2025; up 1 since FY2020.
33	Oregon University System 2 awardees, including Oregon State University and Portland State University Top agencies DOI (Department of the Interior) Commerce (Department of Commerce) EPA (Environmental Protection Agency)	$6,340,186	0.6%	Rank history: #36 in FY2022, #81 in FY2023 and not on the FY2024–FY2025 lists; up 54 since FY2020.
34	Applied Environmental, Inc. Top agencies WHS (DOD Washington Headquarters Service) GSA (General Services Administration) Commerce (Department of Commerce)	$5,954,428	0.5%	Rank history: #32 in FY2022 and not on the FY2023–FY2025 lists; up 83 since FY2020.
35	Environmental Research Group, L.L.C. Top agencies Army (Department of the Army) Navy (Department of the Navy) VA (Department of Veterans Affairs)	$5,875,288	0.5%	Rank history: #33 in FY2022 and not on the FY2023–FY2025 lists; down 1 since FY2020.
36	Southwest Research Institute 2 awardees, including Signature Science LLC Top agencies OSD (Office of the Secretary of Defense) DHS (Department of Homeland Security)	$5,789,827	0.5%	Rank history: #44 in FY2022 and not on the FY2023–FY2025 lists; up 1 since FY2020.
37	Mabbett & Associates, Inc. Top agencies VA (Department of Veterans Affairs) GSA (General Services Administration) Army (Department of the Army)	$5,685,013	0.5%	Rank history: #39 in FY2022, #39 in FY2023, #27 in FY2024 and #50 in FY2025; up 30 since FY2020.
38	Windjammer Environmental LLC Top agencies HHS (Department of Health and Human Services) Army (Department of the Army) SSA (Social Security Administration)	$5,673,107	0.5%	Rank history: not on the FY2022–FY2025 lists; up 135 since FY2020.
39	ABT Global LLC 2 awardees Top agencies EPA (Environmental Protection Agency) DOI (Department of the Interior)	$5,446,763	0.5%	Rank history: #34 in FY2022, #50 in FY2023 and not on the FY2024–FY2025 lists; up 31 since FY2020.
40	Horsley Witten Group, Inc. Top agencies EPA (Environmental Protection Agency) Commerce (Department of Commerce)	$5,240,232	0.5%	Rank history: #70 in FY2022, #61 in FY2023, #66 in FY2024 and not on the FY2025 list; down 10 since FY2020.
41	Paleowest LLC Top agencies USDA (Department of Agriculture) DOI (Department of the Interior) Army (Department of the Army)	$5,079,968	0.4%	Rank history: #60 in FY2022, not on the FY2023 list, #74 in FY2024 and #72 in FY2025; up 84 since FY2020.
42	First Environment Inc. Top agencies Army (Department of the Army) VA (Department of Veterans Affairs) Navy (Department of the Navy)	$4,950,648	0.4%	Rank history: not on the FY2022–FY2023 lists, #42 in FY2024 and #86 in FY2025; up 42 since FY2020.
43	PG Environmental, LLC Top agencies DOI (Department of the Interior) EPA (Environmental Protection Agency) DOJ (Department of Justice)	$4,914,698	0.4%	Rank history: #65 in FY2022, #44 in FY2023 and not on the FY2024–FY2025 lists; up 20 since FY2020.
44	Association of Consultants and Engineers Top agencies Navy (Department of the Navy)	$4,879,793	0.4%	Rank history: #61 in FY2022, #31 in FY2023, #65 in FY2024 and #70 in FY2025; new, not ranked in FY2020.
45	Renova-Sovereign Joint Venture Top agencies Army (Department of the Army)	$4,781,814	0.4%	Rank history: #59 in FY2022, not on the FY2023–FY2024 lists and #92 in FY2025; up 225 since FY2020.
46	Umyuaq Consulting Group, LLC Top agencies Army (Department of the Army)	$4,646,303	0.4%	Rank history: #19 in FY2022, #48 in FY2023, #62 in FY2024 and not on the FY2025 list; up 12 since FY2020.
47	Egc-Ageiss LLC Top agencies USAF (Department of the Air Force) Army (Department of the Army) IBWC (International Boundary and Water Commission U.S.-Mexico)	$4,598,841	0.4%	Rank history: #91 in FY2022 and not on the FY2023–FY2025 lists; up 46 since FY2020.
48	S C & A Inc. 2 awardees, including EC / R Incorporated Top agencies EPA (Environmental Protection Agency) DHS (Department of Homeland Security) NRC (Nuclear Regulatory Commission)	$4,541,580	0.4%	Rank history: #47 in FY2022, #33 in FY2023, #5 in FY2024 and #6 in FY2025; down 2 since FY2020.
49	Science Applications International Corporation Top agencies EPA (Environmental Protection Agency)	$4,509,375	0.4%	Rank history: #84 in FY2022, #56 in FY2023, #28 in FY2024 and #45 in FY2025; up 107 since FY2020.
50	Hsg, LLC Top agencies NASA (National Aeronautics and Space Administration) DOI (Department of the Interior) USAF (Department of the Air Force)	$4,440,993	0.4%	Rank history: #40 in FY2022, #53 in FY2023, #36 in FY2024 and #21 in FY2025; up 115 since FY2020.
51	Independent Strategic Management Solutions Inc. Top agencies DOE (Department of Energy)	$4,365,987	0.4%	Rank history: #43 in FY2022 and not on the FY2023–FY2025 lists; up 5 since FY2020.
52	Gulf South Research Corp Top agencies DHS (Department of Homeland Security) IBWC (International Boundary and Water Commission U.S.-Mexico) Army (Department of the Army)	$4,293,076	0.4%	Rank history: not on the FY2022–FY2025 lists; down 14 since FY2020.
53	National Academy of Sciences Top agencies HHS (Department of Health and Human Services)	$4,198,290	0.4%	Rank history: not on the FY2022–FY2025 lists; down 17 since FY2020.
54	Hazair Inc. Top agencies Army (Department of the Army) USAF (Department of the Air Force) VA (Department of Veterans Affairs)	$4,155,870	0.4%	Rank history: not on the FY2022–FY2025 lists; down 9 since FY2020.
55	Oneida Nation Through Sustainment & Restoration Services, LLC Top agencies USAF (Department of the Air Force) Navy (Department of the Navy) DOI (Department of the Interior)	$4,144,832	0.4%	Rank history: #51 in FY2022, #95 in FY2023 and not on the FY2024–FY2025 lists; up 295 since FY2020.
56	Toeroek Associates, Inc. Top agencies EPA (Environmental Protection Agency) DOI (Department of the Interior)	$4,129,902	0.4%	Rank history: #18 in FY2022, #29 in FY2023, #87 in FY2024 and #84 in FY2025; down 32 since FY2020.
57	WSP USA Solutions Inc. Top agencies DOI (Department of the Interior) DOE (Department of Energy) GSA (General Services Administration)	$4,117,844	0.4%	Rank history: #28 in FY2022, #30 in FY2023 and not on the FY2024–FY2025 lists; up 175 since FY2020.
58	Auxilio Management Services Top agencies Army (Department of the Army) Commerce (Department of Commerce) USAF (Department of the Air Force)	$4,035,000	0.4%	Rank history: #64 in FY2022 and not on the FY2023–FY2025 lists; up 46 since FY2020.
59	Natural Resources Consulting Engineers, Inc. Top agencies USAID (US Agency for International Development)	$3,952,821	0.3%	Rank history: not on the FY2022–FY2025 lists; down 27 since FY2020.
60	Great Lakes Environmental Center, Inc. Top agencies EPA (Environmental Protection Agency) Army (Department of the Army) DOI (Department of the Interior)	$3,899,888	0.3%	Rank history: #24 in FY2022, #23 in FY2023, #21 in FY2024 and #37 in FY2025; down 13 since FY2020.
61	Specpro Professional Services, LLC Top agencies Army (Department of the Army) Navy (Department of the Navy)	$3,881,778	0.3%	Rank history: #58 in FY2022, #72 in FY2023 and not on the FY2024–FY2025 lists; up 7 since FY2020.
62	Straughan Environmental, Inc. Top agencies NASA (National Aeronautics and Space Administration) USDA (Department of Agriculture) HHS (Department of Health and Human Services)	$3,850,691	0.3%	Rank history: #71 in FY2022, #59 in FY2023, #32 in FY2024 and #64 in FY2025; up 10 since FY2020.
63	Seres Engineering & Services LLC 2 awardees, including Seres-Arcadis 8(A) JV, LLC Top agencies USAF (Department of the Air Force) Army (Department of the Army)	$3,831,976	0.3%	Rank history: #27 in FY2022, #65 in FY2023 and not on the FY2024–FY2025 lists; up 8 since FY2020.
64	The NDN Sundance JV LLC Top agencies USAF (Department of the Air Force) Army (Department of the Army) OSD (Office of the Secretary of Defense)	$3,830,960	0.3%	Rank history: #55 in FY2022 and not on the FY2023–FY2025 lists; up 401 since FY2020.
65	Ahtna, Incorporated Through Ahtna Global LLC Top agencies Army (Department of the Army)	$3,788,316	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
66	C.j. Seto Support Services, LLC Top agencies NASA (National Aeronautics and Space Administration) Navy (Department of the Navy) VA (Department of Veterans Affairs)	$3,702,433	0.3%	Rank history: #72 in FY2022, #88 in FY2023, #59 in FY2024 and not on the FY2025 list; up 12 since FY2020.
67	Environmental Science Corporation Top agencies Army (Department of the Army) Navy (Department of the Navy) DLA (Defense Logistics Agency)	$3,653,827	0.3%	Rank history: not on the FY2022–FY2023 lists, #90 in FY2024 and not on the FY2025 list; up 34 since FY2020.
68	Solv LLC Top agencies DOJ (Department of Justice) USDA (Department of Agriculture) Commerce (Department of Commerce)	$3,621,261	0.3%	Rank history: #52 in FY2022, #9 in FY2023, #55 in FY2024 and not on the FY2025 list; up 26 since FY2020.
69	Environmental Management Support, Inc. Top agencies EPA (Environmental Protection Agency)	$3,520,658	0.3%	Rank history: #96 in FY2022, #77 in FY2023, #75 in FY2024 and #56 in FY2025; down 9 since FY2020.
70	Skeo Solutions, Inc. Top agencies EPA (Environmental Protection Agency)	$3,508,914	0.3%	Rank history: #10 in FY2022, #16 in FY2023, #14 in FY2024 and #57 in FY2025; down 54 since FY2020.
71	Integrated Systems Solutions, Inc. Top agencies Commerce (Department of Commerce)	$3,364,512	0.3%	Rank history: #50 in FY2022, #75 in FY2023, #38 in FY2024 and #44 in FY2025; new, not ranked in FY2020.
72	Sst-Ageiss2 JV, LLC Top agencies USAF (Department of the Air Force) Army (Department of the Army)	$3,284,304	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
73	Bering Straits Native Corporation Through Bering Global Solutions, LLC Top agencies Army (Department of the Army)	$3,278,605	0.3%	Rank history: not on the FY2022 list, #62 in FY2023, not on the FY2024 list and #67 in FY2025; up 1 since FY2020.
74	Nelson Engineering Co. Top agencies HHS (Department of Health and Human Services) Commerce (Department of Commerce) GSA (General Services Administration)	$3,246,122	0.3%	Rank history: not on the FY2022 list, #68 in FY2023, #46 in FY2024 and not on the FY2025 list; up 39 since FY2020.
75	Ati-Endyna JV, LLC Top agencies WHS (DOD Washington Headquarters Service)	$3,213,595	0.3%	Rank history: #78 in FY2022, #96 in FY2023, #79 in FY2024 and not on the FY2025 list; up 1 since FY2020.
76	Meadows Cmpg, Inc. Top agencies Army (Department of the Army) Navy (Department of the Navy)	$3,134,606	0.3%	Rank history: not on the FY2022 list, #84 in FY2023 and not on the FY2024–FY2025 lists; down 17 since FY2020.
77	Earth Networks Inc. Top agencies Commerce (Department of Commerce)	$3,123,640	0.3%	Rank history: #87 in FY2022 and not on the FY2023–FY2025 lists; up 12 since FY2020.
78	Ones Whitetail Joint Venture LLC Top agencies Army (Department of the Army)	$3,078,610	0.3%	Rank history: not on the FY2022–FY2025 lists; up 27 since FY2020.
79	Ocean Associates Inc. Top agencies Commerce (Department of Commerce) DOI (Department of the Interior)	$3,024,186	0.3%	Rank history: #63 in FY2022, #82 in FY2023, #34 in FY2024 and #47 in FY2025; up 17 since FY2020.
80	Total Environmental Concepts, Inc. Top agencies HHS (Department of Health and Human Services) USAF (Department of the Air Force)	$3,010,625	0.3%	Rank history: not on the FY2022–FY2025 lists; up 168 since FY2020.
81	Air Resource Specialists, Inc. Top agencies DOI (Department of the Interior) EPA (Environmental Protection Agency) USDA (Department of Agriculture)	$2,961,373	0.3%	Rank history: #86 in FY2022, #69 in FY2023, #86 in FY2024 and #98 in FY2025; up 4 since FY2020.
82	Hikina 2 Komohana Consulting Inc. Top agencies DLA (Defense Logistics Agency)	$2,954,873	0.3%	Rank history: #80 in FY2022, #93 in FY2023, #93 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
83	Ageiss Inc. Top agencies USAF (Department of the Air Force)	$2,785,469	0.2%	Rank history: #73 in FY2022 and not on the FY2023–FY2025 lists; down 31 since FY2020.
84	Arctic Slope Regional Corporation Through Environmental Quality Management, Inc. Top agencies USAF (Department of the Air Force)	$2,744,504	0.2%	Rank history: #75 in FY2022, #47 in FY2023 and not on the FY2024–FY2025 lists; up 316 since FY2020.
85	Arcgeo Inc. Top agencies Army (Department of the Army)	$2,738,390	0.2%	Rank history: not on the FY2022–FY2025 lists; up 326 since FY2020.
86	Bluestone Environmental Group, Inc. Top agencies NASA (National Aeronautics and Space Administration) Army (Department of the Army) Navy (Department of the Navy)	$2,702,818	0.2%	Rank history: #48 in FY2022, #36 in FY2023, #24 in FY2024 and #16 in FY2025; unchanged since FY2020.
87	HGS Engineering Inc. Top agencies VA (Department of Veterans Affairs) DOL (Department of Labor) DOJ (Department of Justice)	$2,543,620	0.2%	Rank history: not on the FY2022–FY2025 lists; down 7 since FY2020.
88	Spatial Front Inc. Top agencies Commerce (Department of Commerce)	$2,525,273	0.2%	Rank history: not on the FY2022–FY2025 lists; up 47 since FY2020.
89	Pi2E JV LLP Top agencies HHS (Department of Health and Human Services) HUD (Department of Housing and Urban Development)	$2,513,652	0.2%	Rank history: #45 in FY2022, #91 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
90	DDC Construction Services LLC Top agencies NASA (National Aeronautics and Space Administration) Army (Department of the Army)	$2,437,874	0.2%	Rank history: not on the FY2022–FY2025 lists; up 31 since FY2020.
91	Whitetail Environmental, LLC Top agencies Army (Department of the Army) DOI (Department of the Interior) Navy (Department of the Navy)	$2,344,177	0.2%	Rank history: #37 in FY2022, #40 in FY2023, #40 in FY2024 and #99 in FY2025; down 1 since FY2020.
92	S.s. Papadopulos & Associates, Inc. 2 awardees Top agencies EPA (Environmental Protection Agency) GSA (General Services Administration) USDA (Department of Agriculture)	$2,334,034	0.2%	Rank history: #76 in FY2022 and not on the FY2023–FY2025 lists; up 20 since FY2020.
93	Industrial Economics Inc. Top agencies EPA (Environmental Protection Agency)	$2,323,221	0.2%	Rank history: #46 in FY2022 and not on the FY2023–FY2025 lists; down 52 since FY2020.
94	The Great Basin Institute Top agencies DOI (Department of the Interior)	$2,316,043	0.2%	Rank history: #57 in FY2022, #86 in FY2023 and not on the FY2024–FY2025 lists; down 19 since FY2020.
95	Harris Environmental Group Inc. 2 awardees Top agencies Army (Department of the Army) DOI (Department of the Interior) USDA (Department of Agriculture)	$2,301,550	0.2%	Rank history: not on the FY2022–FY2025 lists; up 24 since FY2020.
96	Swift River Versar JV Top agencies USAF (Department of the Air Force) Army (Department of the Army)	$2,282,801	0.2%	Rank history: #97 in FY2022 and not on the FY2023–FY2025 lists; up 36 since FY2020.
97	Battelle Memorial Institute Top agencies EPA (Environmental Protection Agency)	$2,257,278	0.2%	Rank history: not on the FY2022–FY2025 lists; down 5 since FY2020.
98	Hydrogeologic, Inc. Top agencies NASA (National Aeronautics and Space Administration)	$2,246,078	0.2%	Rank history: not on the FY2022 list, #71 in FY2023 and not on the FY2024–FY2025 lists; up 143 since FY2020.
99	Southeastern Archaeological Research, LLC Top agencies Army (Department of the Army) DOI (Department of the Interior)	$2,212,682	0.2%	Rank history: not on the FY2022–FY2025 lists; down 4 since FY2020.
100	Earth Smart Environmental Solutions LLC Top agencies VA (Department of Veterans Affairs) USDA (Department of Agriculture)	$2,208,322	0.2%	Rank history: #98 in FY2022, not on the FY2023 list, #89 in FY2024 and #91 in FY2025; up 26 since FY2020.

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100 of 1,045 contractors listed here. See the rest on GovTribe.

Rankings for the codes under NAICS 54162

Code	Net obligations	Largest contractor
541620 Environmental Consulting Services	$1,017,612,128	Tetra Tech, 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 $1.13 billion obligated before deobligations, so they never pass 100%.
Parent companies: each action counts under the ultimate parent its award record names, or under the awardee when it names none, so no dollar counts twice. Parents of the same name (Inc., LLC and the like aside) count as one company, since FPDS records a company's parent under more than one UEI over time. GovTribe corrects a few parents and names by hand; see the corrections.
Fiscal year 2021 ran Oct 1, 2020 – Sep 30, 2021. The Department of Defense reports its contract actions to FPDS about 90 days late, so a fiscal year is ranked once they're in, in February, and the list doesn't change after.
Rank changes compare with FY2020. "New" marks a company outside that period's top 500, and "Returned" one of those that was on an earlier fiscal year's list.
Rank lines show each company's rank on every fiscal year's list since FY2021, #1 at the top, on a scale that gives the top of the list more room. A dashed stretch spans years it wasn't on the list. The step from FY2020 takes the color of the rank change beside it.
Placeholder recipients FPDS uses when it names no company ("Miscellaneous Foreign Contractors" and the like) aren't ranked.

Quick answers

Who were the top 10 NAICS 54162 contractors in FY2021?

1. Tetra Tech, Inc. ($64.6M), 2. Boston Government Services, LLC ($39M), 3. Eastern Research Group Inc. ($38M), 4. Project Enhancement Corporation ($37M), 5. Environmental Incentives, Inc. ($30.8M), 6. Weston Solutions Holdings, Inc. ($28.9M), 7. Sol Solutions, LLC ($21.6M), 8. ICF International, Inc. ($19.8M), 9. Ardl Inc. ($14.9M), 10. Versar Inc. ($14.3M).

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