Top 100 Contractors in PSC S222: Waste Treatment and Storage, FY2021

Name: Top 100 Contractors in PSC S222: Waste Treatment and Storage, FY2021
Creator: GovTribe

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

The top 10 won 29% of FY2021 PSC S222 contract dollars

Contract obligations: $173,726,336 Net of deobligations, by contracts coded PSC S222
Contractors: 552 Parent companies with an obligation
Largest contractor: Black Gold Industries $8.3 million, 4.0% 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	Black Gold Industries Top agencies DLA (Defense Logistics Agency)	$8,302,549	4.0%	Rank history: #2 in FY2022, #6 in FY2023, #8 in FY2024 and #10 in FY2025; up 1 since FY2020.
2	Industrial Waste Utilization, LLC Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy)	$7,283,720	3.5%	Rank history: #3 in FY2022, #5 in FY2023, #7 in FY2024 and #9 in FY2025; up 2 since FY2020.
3	Tri-State Government Services Inc. Top agencies DLA (Defense Logistics Agency)	$7,242,820	3.5%	Rank history: #7 in FY2022, #3 in FY2023, #4 in FY2024 and #6 in FY2025; down 2 since FY2020.
4	Tradebe Treatment and Recycling LLC 2 awardees Top agencies DLA (Defense Logistics Agency) VA (Department of Veterans Affairs)	$7,206,398	3.5%	Rank history: #4 in FY2022, #2 in FY2023, #10 in FY2024 and #20 in FY2025; up 113 since FY2020.
5	Willow Environmental Inc. Top agencies DLA (Defense Logistics Agency)	$5,130,691	2.5%	Rank history: #13 in FY2022, #7 in FY2023, #9 in FY2024 and #2 in FY2025; down 2 since FY2020.
6	Ecosystech JV LLC Top agencies DLA (Defense Logistics Agency)	$5,096,402	2.5%	Rank history: #14 in FY2022, #30 in FY2023 and not on the FY2024–FY2025 lists; up 4 since FY2020.
7	Sued-Muell GMBH & Co. KG Fuer Abfalltransporte UND Sonderabfallbeseitigung Top agencies DLA (Defense Logistics Agency) USAF (Department of the Air Force)	$5,060,117	2.5%	Rank history: #10 in FY2022, #11 in FY2023, #3 in FY2024 and #7 in FY2025; up 6 since FY2020.
8	Clean Venture Inc. Top agencies HHS (Department of Health and Human Services)	$4,900,828	2.4%	Rank history: not on the FY2022–FY2025 lists; down 2 since FY2020.
9	Neie Medical Waste Services, LLC Top agencies VA (Department of Veterans Affairs) Army (Department of the Army)	$4,724,354	2.3%	Rank history: #9 in FY2022, #13 in FY2023, #16 in FY2024 and #17 in FY2025; down 1 since FY2020.
10	Clean Harbors Inc 5 awardees, including Clean Harbors Environmental Services Inc., Safety-Kleen Systems, Inc. and Emerald Services, Inc. Top agencies DLA (Defense Logistics Agency) VA (Department of Veterans Affairs) USAF (Department of the Air Force)	$4,198,384	2.0%	Rank history: #5 in FY2022, #1 in FY2023, #1 in FY2024 and #1 in FY2025; up 2 since FY2020.
11	J&T Recycling Corporation Top agencies DLA (Defense Logistics Agency)	$4,105,585	2.0%	Rank history: #15 in FY2022, #19 in FY2023, #23 in FY2024 and #23 in FY2025; up 4 since FY2020.
12	Yamaki Co., Ltd. Top agencies Navy (Department of the Navy)	$4,087,003	2.0%	Rank history: #11 in FY2022, #14 in FY2023, #20 in FY2024 and #15 in FY2025; down 5 since FY2020.
13	C & C Environmental Inc. Top agencies DLA (Defense Logistics Agency)	$4,011,894	1.9%	Rank history: #12 in FY2022, #10 in FY2023, #11 in FY2024 and #4 in FY2025; down 4 since FY2020.
14	Landscape Management Systems, Inc. Top agencies Navy (Department of the Navy) DLA (Defense Logistics Agency) USAF (Department of the Air Force)	$3,799,052	1.8%	Rank history: #16 in FY2022, #23 in FY2023, #17 in FY2024 and #18 in FY2025; unchanged since FY2020.
15	Gryphon Environmental, LLC Top agencies USAF (Department of the Air Force)	$3,005,877	1.5%	Rank history: #72 in FY2022, #15 in FY2023, #88 in FY2024 and not on the FY2025 list; up 4 since FY2020.
16	Kanto Kosan Co. Ltd. Top agencies Navy (Department of the Navy)	$2,997,274	1.5%	Rank history: not on the FY2022–FY2025 lists; up 24 since FY2020.
17	GS Environmental, Inc. Top agencies DLA (Defense Logistics Agency)	$2,927,317	1.4%	Rank history: #23 in FY2022, #52 in FY2023, #35 in FY2024 and #28 in FY2025; up 8 since FY2020.
18	Horizon Environmental Services, Inc. Top agencies DLA (Defense Logistics Agency)	$2,503,985	1.2%	Rank history: #22 in FY2022, #8 in FY2023, #2 in FY2024 and #3 in FY2025; down 2 since FY2020.
19	AES Asset Acquisition Corporation Top agencies DLA (Defense Logistics Agency)	$2,447,608	1.2%	Rank history: #21 in FY2022, #21 in FY2023, #29 in FY2024 and not on the FY2025 list; down 2 since FY2020.
20	Logex System GMBH &Co. KG Through Logex System International GMBH Top agencies DLA (Defense Logistics Agency)	$2,414,424	1.2%	Rank history: #20 in FY2022, #24 in FY2023, #52 in FY2024 and not on the FY2025 list; up 1 since FY2020.
21	Heritage Environmental Services Inc. Through Arcwood Environmental, LLC Top agencies DLA (Defense Logistics Agency) VA (Department of Veterans Affairs) Commerce (Department of Commerce)	$2,339,404	1.1%	Rank history: #25 in FY2022, #54 in FY2023, #43 in FY2024 and not on the FY2025 list; up 6 since FY2020.
22	Advant-Edge Solutions of Middle Atlantic Inc. Top agencies VA (Department of Veterans Affairs) Navy (Department of the Navy) Army (Department of the Army)	$2,287,599	1.1%	Rank history: #6 in FY2022, #12 in FY2023, #6 in FY2024 and #11 in FY2025; up 11 since FY2020.
23	Earth Smart Environmental Solutions LLC Top agencies VA (Department of Veterans Affairs)	$2,214,420	1.1%	Rank history: #17 in FY2022, #16 in FY2023, #13 in FY2024 and #13 in FY2025; up 5 since FY2020.
24	Pacific Commercial Services, Inc. Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy)	$1,998,213	1.0%	Rank history: #26 in FY2022, #28 in FY2023, #12 in FY2024 and #14 in FY2025; up 5 since FY2020.
25	DBI Waste Systems Inc. Top agencies VA (Department of Veterans Affairs) DHS (Department of Homeland Security)	$1,845,738	0.9%	Rank history: #18 in FY2022, #20 in FY2023, #26 in FY2024 and not on the FY2025 list; up 72 since FY2020.
26	Hamilton Alliance Inc. Top agencies VA (Department of Veterans Affairs) DOI (Department of the Interior) Commerce (Department of Commerce)	$1,827,618	0.9%	Rank history: #24 in FY2022, #18 in FY2023, #27 in FY2024 and #29 in FY2025; down 6 since FY2020.
27	Jfe-K Ryukyu Logistic JV Top agencies DLA (Defense Logistics Agency)	$1,658,124	0.8%	Rank history: #1 in FY2022, #4 in FY2023, #46 in FY2024 and #31 in FY2025; down 1 since FY2020.
28	Shimada Shokai Co., Ltd Top agencies DLA (Defense Logistics Agency)	$1,602,320	0.8%	Rank history: #43 in FY2022, #43 in FY2023, #50 in FY2024 and #34 in FY2025; down 6 since FY2020.
29	TD Environmental Inc. Top agencies DLA (Defense Logistics Agency)	$1,561,705	0.8%	Rank history: #52 in FY2022, #53 in FY2023, #48 in FY2024 and #45 in FY2025; down 6 since FY2020.
30	Clean Earth Systems, Inc. Top agencies DLA (Defense Logistics Agency)	$1,515,206	0.7%	Rank history: #27 in FY2022, #27 in FY2023, #24 in FY2024 and #32 in FY2025; new, not ranked in FY2020.
31	Tet Consulting & Business Management Services, LLC Top agencies DHS (Department of Homeland Security)	$1,473,472	0.7%	Rank history: #29 in FY2022, #31 in FY2023, #31 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
32	Ecolfer SRL Top agencies DLA (Defense Logistics Agency)	$1,439,513	0.7%	Rank history: #28 in FY2022, #67 in FY2023 and not on the FY2024–FY2025 lists; up 13 since FY2020.
33	Grundy Government Services, LLC Top agencies Army (Department of the Army)	$1,308,993	0.6%	Rank history: #30 in FY2022, #62 in FY2023 and not on the FY2024–FY2025 lists; up 2 since FY2020.
34	P.u. Septic Service, Inc. Top agencies Army (Department of the Army) Navy (Department of the Navy)	$1,268,183	0.6%	Rank history: #44 in FY2022, #39 in FY2023, #41 in FY2024 and #43 in FY2025; up 17 since FY2020.
35	Mabbett & Associates, Inc. Top agencies VA (Department of Veterans Affairs)	$1,244,184	0.6%	Rank history: #32 in FY2022, #48 in FY2023, not on the FY2024 list and #53 in FY2025; up 4 since FY2020.
36	Auxilio Management Services Top agencies Commerce (Department of Commerce)	$1,211,864	0.6%	Rank history: #35 in FY2022, #75 in FY2023, #77 in FY2024 and #77 in FY2025; up 82 since FY2020.
37	Anna Lisa Luna Construction, Inc. Top agencies Navy (Department of the Navy) USAF (Department of the Air Force)	$1,192,738	0.6%	Rank history: #33 in FY2022, #38 in FY2023, #79 in FY2024 and not on the FY2025 list; up 5 since FY2020.
38	Guahan Waste Control, Inc. Top agencies DLA (Defense Logistics Agency)	$1,124,822	0.5%	Rank history: #39 in FY2022, #34 in FY2023, #39 in FY2024 and #47 in FY2025; new, not ranked in FY2020.
39	Tad Environment Top agencies DLA (Defense Logistics Agency)	$1,106,859	0.5%	Rank history: #34 in FY2022, #36 in FY2023, #40 in FY2024 and #64 in FY2025; down 7 since FY2020.
40	West Central Environmental Corp. Top agencies DLA (Defense Logistics Agency)	$1,092,518	0.5%	Rank history: #37 in FY2022, #40 in FY2023, #33 in FY2024 and #38 in FY2025; down 6 since FY2020.
41	Meltec Ltd. Top agencies Navy (Department of the Navy) USAF (Department of the Air Force)	$1,030,338	0.5%	Rank history: #55 in FY2022, #45 in FY2023, #63 in FY2024 and not on the FY2025 list; up 7 since FY2020.
42	Kamal Mustafa Al Sultan General Trading & Contracting Co. WLL Top agencies USAF (Department of the Air Force)	$1,000,068	0.5%	Rank history: #31 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
43	Feyen's Arcade Pumping Service, LLC Top agencies Army (Department of the Army)	$979,669	0.5%	Rank history: #19 in FY2022, #46 in FY2023, #51 in FY2024 and #50 in FY2025; up 29 since FY2020.
44	Willkom, Inc. Top agencies DLA (Defense Logistics Agency)	$963,075	0.5%	Rank history: #46 in FY2022, #59 in FY2023, #66 in FY2024 and not on the FY2025 list; up 8 since FY2020.
45	Kimin Eng Co., Ltd. Top agencies DLA (Defense Logistics Agency)	$888,451	0.4%	Rank history: #40 in FY2022, #32 in FY2023, #47 in FY2024 and not on the FY2025 list; down 7 since FY2020.
46	Major Contracting Services, Inc. Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$867,838	0.4%	Rank history: not on the FY2022 list, #60 in FY2023, #85 in FY2024 and #72 in FY2025; down 5 since FY2020.
47	Stericycle Inc. 2 awardees Top agencies VA (Department of Veterans Affairs) HHS (Department of Health and Human Services) USAF (Department of the Air Force)	$860,094	0.4%	Rank history: #65 in FY2022 and not on the FY2023–FY2025 lists; unchanged since FY2020.
48	B & N Resources, LLC Top agencies DLA (Defense Logistics Agency)	$822,000	0.4%	Rank history: not on the FY2022–FY2025 lists; down 4 since FY2020.
49	Rethmann AG & Co. KG Through Remondis Industrie Service Gmbh. Top agencies DLA (Defense Logistics Agency) USAF (Department of the Air Force)	$757,959	0.4%	Rank history: #59 in FY2022, #84 in FY2023 and not on the FY2024–FY2025 lists; up 13 since FY2020.
50	Mission Contracting Inc. Top agencies Commerce (Department of Commerce)	$739,426	0.4%	Rank history: #47 in FY2022, #61 in FY2023, #56 in FY2024 and #55 in FY2025; new, not ranked in FY2020.
51	Jet Blast, Inc. Top agencies DHS (Department of Homeland Security)	$701,748	0.3%	Rank history: #36 in FY2022, #44 in FY2023, #61 in FY2024 and #84 in FY2025; up 7 since FY2020.
52	Onaka Gumi Co.,Ltd. Top agencies DLA (Defense Logistics Agency)	$701,647	0.3%	Rank history: #57 in FY2022, #88 in FY2023, #58 in FY2024 and #46 in FY2025; up 9 since FY2020.
53	Hidden Water Inc. Top agencies DLA (Defense Logistics Agency)	$683,007	0.3%	Rank history: #38 in FY2022 and not on the FY2023–FY2025 lists; down 22 since FY2020.
54	RTC Facilities Management Services LLC Top agencies USAF (Department of the Air Force)	$674,532	0.3%	Rank history: #51 in FY2022, #73 in FY2023 and not on the FY2024–FY2025 lists; up 16 since FY2020.
55	Island Contracting, Inc. Top agencies Commerce (Department of Commerce)	$656,067	0.3%	Rank history: #50 in FY2022 and not on the FY2023–FY2025 lists; down 6 since FY2020.
56	Reg Products, LLC Top agencies VA (Department of Veterans Affairs)	$655,741	0.3%	Rank history: not on the FY2022–FY2025 lists; unchanged since FY2020.
57	Set the Standard, LLC Top agencies VA (Department of Veterans Affairs)	$640,697	0.3%	Rank history: #45 in FY2022, #47 in FY2023, not on the FY2024 list and #57 in FY2025; new, not ranked in FY2020.
58	VMX International LLC Top agencies Army (Department of the Army)	$576,487	0.3%	Rank history: #60 in FY2022 and not on the FY2023–FY2025 lists; down 3 since FY2020.
59	Fremont Sanitation District Top agencies DOJ (Department of Justice)	$553,494	0.3%	Rank history: not on the FY2022–FY2025 lists; unchanged since FY2020.
60	Providence Environmental Concepts and Services LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$526,561	0.3%	Rank history: #66 in FY2022, #64 in FY2023, #65 in FY2024 and #97 in FY2025; up 3 since FY2020.
61	EDM Enterprises, LLC Top agencies VA (Department of Veterans Affairs)	$521,529	0.3%	Rank history: #54 in FY2022, #29 in FY2023, #28 in FY2024 and #37 in FY2025; down 15 since FY2020.
62	A-1 Pump & Jet Service Inc. Top agencies USAF (Department of the Air Force)	$519,247	0.3%	Rank history: not on the FY2022–FY2025 lists; up 98 since FY2020.
63	Gruene Shredding LLC Top agencies VA (Department of Veterans Affairs)	$502,800	0.2%	Rank history: #64 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
64	Waste Management, Inc. 13 awardees, including Waste Management Inc. of Florida, Waste Management of Illinois, Inc. and Waste Management of Washington, Inc. Top agencies DOJ (Department of Justice) VA (Department of Veterans Affairs) Commerce (Department of Commerce)	$501,777	0.2%	Rank history: #86 in FY2022, #66 in FY2023 and not on the FY2024–FY2025 lists; up 28 since FY2020.
65	Republic Services Inc. 7 awardees, including Montana Waste Systems, Inc., Honeygo Run Reclamation Center, Inc. and Republic Silver State Disposal Inc. Top agencies USAF (Department of the Air Force) DOJ (Department of Justice) VA (Department of Veterans Affairs)	$489,947	0.2%	Rank history: #71 in FY2022, #97 in FY2023, #5 in FY2024 and #5 in FY2025; up 10 since FY2020.
66	Ncns Environmental, Inc. Top agencies VA (Department of Veterans Affairs) DHA (Defense Health Agency) USAF (Department of the Air Force)	$489,730	0.2%	Rank history: #82 in FY2022, #92 in FY2023, #71 in FY2024 and not on the FY2025 list; down 2 since FY2020.
67	Horizon Environmental Solutions Corporation Top agencies DLA (Defense Logistics Agency)	$455,587	0.2%	Rank history: #63 in FY2022, #22 in FY2023, #57 in FY2024 and #67 in FY2025; down 7 since FY2020.
68	Coles Group (The) LLC Top agencies USAF (Department of the Air Force)	$452,650	0.2%	Rank history: #95 in FY2022, #86 in FY2023, #95 in FY2024 and #93 in FY2025; up 3 since FY2020.
69	Veolia Water North America-West LLC 2 awardees, including Veolia Es (Uk) Limited and Veolia Es Technical Solutions LLC Top agencies DLA (Defense Logistics Agency) USDA (Department of Agriculture) USAF (Department of the Air Force)	$448,914	0.2%	Rank history: #53 in FY2022, #72 in FY2023 and not on the FY2024–FY2025 lists; down 2 since FY2020.
70	Corporate Waste Solutions LLC Top agencies VA (Department of Veterans Affairs)	$434,041	0.2%	Rank history: #69 in FY2022, #56 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
71	Optech-Monette, LLC Top agencies USAF (Department of the Air Force)	$422,000	0.2%	Rank history: #56 in FY2022, #74 in FY2023, #86 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
72	Rumpke Consolidated Companies Inc. Through Rumpke of Ohio Inc. Top agencies VA (Department of Veterans Affairs)	$409,827	0.2%	Rank history: not on the FY2022–FY2025 lists; up 4 since FY2020.
73	North Mason Fiber Company Top agencies Navy (Department of the Navy)	$408,590	0.2%	Rank history: #79 in FY2022, not on the FY2023–FY2024 lists and #60 in FY2025; up 76 since FY2020.
74	Nicklaus Engineering, Inc. Top agencies Army (Department of the Army)	$388,397	0.2%	Rank history: #93 in FY2022 and not on the FY2023–FY2025 lists; up 82 since FY2020.
75	Pacific General Trading and C Ontracting Establishment Top agencies USAF (Department of the Air Force)	$377,197	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
76	Environmental Compliance Consultants, Inc. Top agencies VA (Department of Veterans Affairs) USAF (Department of the Air Force)	$373,147	0.2%	Rank history: #78 in FY2022, #37 in FY2023, #19 in FY2024 and #16 in FY2025; new, not ranked in FY2020.
77	DAE IL Sanitary Public Corporation Top agencies Army (Department of the Army)	$364,517	0.2%	Rank history: #49 in FY2022, #55 in FY2023, #60 in FY2024 and #74 in FY2025; down 12 since FY2020.
78	EWA Direction Inc. Top agencies VA (Department of Veterans Affairs)	$364,183	0.2%	Rank history: not on the FY2022–FY2023 lists, #54 in FY2024 and #35 in FY2025; up 32 since FY2020.
79	Estrategy Consulting, LLC Top agencies VA (Department of Veterans Affairs) HHS (Department of Health and Human Services) Navy (Department of the Navy)	$358,206	0.2%	Rank history: #74 in FY2022, #78 in FY2023, #67 in FY2024 and #79 in FY2025; up 8 since FY2020.
80	Gills Demolition & Backhoe Inc. Top agencies Army (Department of the Army)	$346,765	0.2%	Rank history: #75 in FY2022, #81 in FY2023, #90 in FY2024 and not on the FY2025 list; up 36 since FY2020.
81	Trilogy Medwaste Southeast LLC Top agencies VA (Department of Veterans Affairs) HHS (Department of Health and Human Services)	$323,641	0.2%	Rank history: #76 in FY2022, #87 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
82	Reworld Holding Corporation 5 awardees, including Reworld Fairfax, LLC, Reworld Solutions, LLC and Covanta Stanislaus Inc. Top agencies Treasury (Department of the Treasury) Commerce (Department of Commerce) DOJ (Department of Justice)	$307,351	0.1%	Rank history: not on the FY2022–FY2025 lists; up 90 since FY2020.
83	Seobu Environment Top agencies Army (Department of the Army)	$296,522	0.1%	Rank history: #88 in FY2022 and not on the FY2023–FY2025 lists; up 8 since FY2020.
84	Bluwater Services, LLC Top agencies USAF (Department of the Air Force)	$287,300	0.1%	Rank history: #77 in FY2022, #82 in FY2023 and not on the FY2024–FY2025 lists; down 15 since FY2020.
85	Jfe-K Iwakuni HW JV Top agencies DLA (Defense Logistics Agency)	$285,898	0.1%	Rank history: #85 in FY2022, #95 in FY2023 and not on the FY2024–FY2025 lists; up 49 since FY2020.
86	A-Ok Portables, LLC Top agencies Navy (Department of the Navy)	$282,856	0.1%	Rank history: not on the FY2022–FY2025 lists; up 381 since FY2020.
87	Natives of Kodiak, Incorporated Through Trinity Analysis and Development Corp. Top agencies USAF (Department of the Air Force)	$282,836	0.1%	Rank history: not on the FY2022–FY2025 lists; down 8 since FY2020.
88	Gotemba Eiseisha, Co. Ltd. Top agencies Navy (Department of the Navy)	$278,006	0.1%	Rank history: not on the FY2022 list, #96 in FY2023 and not on the FY2024–FY2025 lists; down 7 since FY2020.
89	1 Call Septic Service, Inc. Top agencies USAF (Department of the Air Force)	$265,600	0.1%	Rank history: #90 in FY2022 and not on the FY2023–FY2025 lists; down 5 since FY2020.
90	Mcdonald Farms Enterprises, Inc. Top agencies USAF (Department of the Air Force)	$263,745	0.1%	Rank history: not on the FY2022–FY2025 lists; down 4 since FY2020.
91	Okinawaken Sangyo Haikibutsushori Cooperative Association Top agencies USAF (Department of the Air Force)	$260,723	0.1%	Rank history: not on the FY2022 list, #63 in FY2023, #92 in FY2024 and #71 in FY2025; down 3 since FY2020.
92	Cherokee Nation Environmental Solutions, L.L.C. Top agencies DLA (Defense Logistics Agency)	$260,212	0.1%	Rank history: #84 in FY2022, not on the FY2023 list, #78 in FY2024 and #76 in FY2025; up 53 since FY2020.
93	County of Mariposa Top agencies DOI (Department of the Interior)	$257,085	0.1%	Rank history: not on the FY2022–FY2025 lists; up 13 since FY2020.
94	Ecology Mir Group LLC Top agencies DOJ (Department of Justice) USDA (Department of Agriculture) DOI (Department of the Interior)	$252,214	0.1%	Rank history: not on the FY2022–FY2023 lists, #93 in FY2024 and not on the FY2025 list; up 168 since FY2020.
95	Del Mar Environmental & Construction Services Inc. Top agencies Navy (Department of the Navy)	$250,930	0.1%	Rank history: not on the FY2022–FY2025 lists; down 15 since FY2020.
96	United Site Services of California Inc. Top agencies USDA (Department of Agriculture) Army (Department of the Army)	$246,118	0.1%	Rank history: not on the FY2022–FY2025 lists; up 326 since FY2020.
97	Environmental and Energy Innovations, LLC Top agencies VA (Department of Veterans Affairs)	$245,849	0.1%	Rank history: #96 in FY2022, #90 in FY2023, #72 in FY2024 and #91 in FY2025; up 14 since FY2020.
98	Kaihou Kogyo Co., Ltd. Top agencies USAF (Department of the Air Force)	$240,365	0.1%	Rank history: #92 in FY2022 and not on the FY2023–FY2025 lists; up 4 since FY2020.
99	Chamberlin & Wingert Sanitary Services LLC Top agencies Army (Department of the Army)	$237,297	0.1%	Rank history: #98 in FY2022 and not on the FY2023–FY2025 lists; up 32 since FY2020.
100	Windjammer Environmental LLC Top agencies DHS (Department of Homeland Security)	$227,966	0.1%	Rank history: not on the FY2022–FY2025 lists; down 1 since FY2020.

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100 of 552 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 $206 million 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 PSC S222 contractors in FY2021?

1. Black Gold Industries ($8.3M), 2. Industrial Waste Utilization, LLC ($7.28M), 3. Tri-State Government Services Inc. ($7.24M), 4. Tradebe Treatment and Recycling LLC ($7.21M), 5. Willow Environmental Inc. ($5.13M), 6. Ecosystech JV LLC ($5.1M), 7. Sued-Muell GMBH & Co. KG Fuer Abfalltransporte UND Sonderabfallbeseitigung ($5.06M), 8. Clean Venture Inc. ($4.9M), 9. Neie Medical Waste Services, LLC ($4.72M), 10. Clean Harbors Inc ($4.2M).

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