Top 100 Contractors in NAICS 562991: Septic Tank and Related Services, FY2023

Name: Top 100 Contractors in NAICS 562991: Septic Tank and Related Services, FY2023
Creator: GovTribe

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

The top 10 won 26% of FY2023 NAICS 562991 contract dollars

Contract obligations: $85,156,746 Net of deobligations, by contracts coded NAICS 562991
Contractors: 607 Parent companies with an obligation
Largest contractor: Major Contracting Services, Inc. $4.15 million, 4.4% 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	Major Contracting Services, Inc. Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$4,151,153	4.4%	Rank history: #2 in FY2021, #2 in FY2022, #2 in FY2024 and #3 in FY2025; up 1 since FY2022.
2	Ronjon Rentals Inc 2 awardees Top agencies Army (Department of the Army) Navy (Department of the Navy)	$3,983,396	4.2%	Rank history: #4 in FY2021, #1 in FY2022, #3 in FY2024 and #2 in FY2025; down 1 since FY2022.
3	Vantex Service Corporation Top agencies Army (Department of the Army) Navy (Department of the Navy)	$3,333,029	3.6%	Rank history: #3 in FY2021, #4 in FY2022, #6 in FY2024 and #5 in FY2025; up 1 since FY2022.
4	Bucks Sanitary Service Inc. Top agencies USDA (Department of Agriculture) DOI (Department of the Interior) DHS (Department of Homeland Security)	$2,695,863	2.9%	Rank history: not on the FY2021 list, #11 in FY2022, #5 in FY2024 and #32 in FY2025; up 7 since FY2022.
5	Krätz GMBH Top agencies Army (Department of the Army)	$2,217,194	2.4%	Rank history: not on the FY2021–FY2022 lists, #4 in FY2024 and #6 in FY2025; new.
6	Ronjon Rentals Vantex Service Joint Venture Top agencies Navy (Department of the Navy) Army (Department of the Army) DHA (Defense Health Agency)	$1,950,454	2.1%	Rank history: #5 in FY2021, #5 in FY2022, #7 in FY2024 and #9 in FY2025; down 1 since FY2022.
7	Future Services General Trading & Contracting Co. Top agencies USAF (Department of the Air Force)	$1,908,523	2.0%	Rank history: not on the FY2021–FY2022 lists, #9 in FY2024 and #11 in FY2025; new.
8	B & B Portable Toilets LLC Top agencies USDA (Department of Agriculture)	$1,700,557	1.8%	Rank history: not on the FY2021 list, #25 in FY2022, #69 in FY2024 and #51 in FY2025; up 17 since FY2022.
9	P.u. Septic Service, Inc. Top agencies Army (Department of the Army) Navy (Department of the Navy) DOI (Department of the Interior)	$1,235,457	1.3%	Rank history: #12 in FY2021, #15 in FY2022, #14 in FY2024 and #16 in FY2025; up 6 since FY2022.
10	Skookum Educational Programs Top agencies Army (Department of the Army)	$1,159,327	1.2%	Rank history: #10 in FY2021, #8 in FY2022, #10 in FY2024 and #8 in FY2025; down 2 since FY2022.
11	Sani-Can, Inc. Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$1,134,482	1.2%	Rank history: #29 in FY2021, #23 in FY2022, #23 in FY2024 and #33 in FY2025; up 12 since FY2022.
12	VIP Sanitation Inc. Top agencies Army (Department of the Army) Navy (Department of the Navy) DHA (Defense Health Agency)	$1,079,171	1.1%	Rank history: #18 in FY2021, #6 in FY2022 and not on the FY2024–FY2025 lists; down 6 since FY2022.
13	Critical Contingency Solutions LLC Top agencies Army (Department of the Army)	$1,074,514	1.1%	Rank history: #46 in FY2021, #36 in FY2022, #16 in FY2024 and #17 in FY2025; up 23 since FY2022.
14	Kg&T Septic Inc. Top agencies USDA (Department of Agriculture)	$1,072,451	1.1%	Rank history: not on the FY2021 list, #14 in FY2022 and not on the FY2024–FY2025 lists; unchanged since FY2022.
15	Toou Development Co., Ltd Top agencies Army (Department of the Army)	$1,020,681	1.1%	Rank history: #19 in FY2021, #20 in FY2022, #24 in FY2024 and #19 in FY2025; up 5 since FY2022.
16	Cotton Commercial Usa, Inc. Top agencies DHS (Department of Homeland Security)	$998,915	1.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
17	Big Valley Sanitation Inc. 2 awardees Top agencies USDA (Department of Agriculture) DOI (Department of the Interior) DOE (Department of Energy)	$932,254	1.0%	Rank history: #96 in FY2021, #42 in FY2022, not on the FY2024 list and #53 in FY2025; up 25 since FY2022.
18	United Site Services of Nevada, Inc. 3 awardees Top agencies USDA (Department of Agriculture) Army (Department of the Army) VA (Department of Veterans Affairs)	$908,374	1.0%	Rank history: #43 in FY2021, #57 in FY2022 and not on the FY2024–FY2025 lists; up 39 since FY2022.
19	Tex-San Site Service LLC Top agencies USAF (Department of the Air Force)	$853,021	0.9%	Rank history: not on the FY2021–FY2022 lists, #22 in FY2024 and #31 in FY2025; new.
20	Feyen's Arcade Pumping Service, LLC Top agencies Army (Department of the Army)	$824,953	0.9%	Rank history: #14 in FY2021, #3 in FY2022, #20 in FY2024 and #26 in FY2025; down 17 since FY2022.
21	Architectural House Est. for Contracting Top agencies USAF (Department of the Air Force)	$797,777	0.8%	Rank history: #30 in FY2021, #12 in FY2022, #26 in FY2024 and #24 in FY2025; down 9 since FY2022.
22	Villain Baits Inc. Top agencies Army (Department of the Army)	$755,600	0.8%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
23	Hawaii Johns Inc. Top agencies Army (Department of the Army)	$740,515	0.8%	Rank history: #23 in FY2021, #44 in FY2022, #11 in FY2024 and #27 in FY2025; up 21 since FY2022.
24	Best Way of Indiana, Inc. Top agencies Army (Department of the Army)	$720,177	0.8%	Rank history: #22 in FY2021, #27 in FY2022 and not on the FY2024–FY2025 lists; up 3 since FY2022.
25	E & D Enterprises Inc. Top agencies Army (Department of the Army)	$707,872	0.8%	Rank history: #27 in FY2021, #45 in FY2022, #25 in FY2024 and #28 in FY2025; up 20 since FY2022.
26	Tammy's Alliance, LLC Top agencies USDA (Department of Agriculture) Army (Department of the Army)	$702,257	0.7%	Rank history: not on the FY2021–FY2022 lists, #65 in FY2024 and #37 in FY2025; up 93 since FY2022.
27	Bob Drayton Inc. Top agencies USAF (Department of the Air Force)	$689,605	0.7%	Rank history: #26 in FY2021, #22 in FY2022, #27 in FY2024 and #34 in FY2025; down 5 since FY2022.
28	Mondak Portables LLC Top agencies USAF (Department of the Air Force)	$687,585	0.7%	Rank history: #41 in FY2021, #54 in FY2022, #28 in FY2024 and #68 in FY2025; up 26 since FY2022.
29	WAC LLC Top agencies DHS (Department of Homeland Security) USDA (Department of Agriculture) USAF (Department of the Air Force)	$687,243	0.7%	Rank history: #33 in FY2021, #31 in FY2022, #29 in FY2024 and not on the FY2025 list; up 2 since FY2022.
30	Mariposa Portable Santitation LLC Top agencies DOI (Department of the Interior)	$666,033	0.7%	Rank history: #56 in FY2021, #35 in FY2022, #45 in FY2024 and #55 in FY2025; up 5 since FY2022.
31	Ecology Mir Group LLC Top agencies Army (Department of the Army) Navy (Department of the Navy) USDA (Department of Agriculture)	$664,033	0.7%	Rank history: #70 in FY2021, #69 in FY2022, #53 in FY2024 and not on the FY2025 list; up 38 since FY2022.
32	Ohio General Contracting LLC Top agencies USAF (Department of the Air Force)	$650,646	0.7%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
33	Constance D Gooch Top agencies DHS (Department of Homeland Security)	$595,860	0.6%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
34	Emergency Support Services, LLC Top agencies USDA (Department of Agriculture)	$591,230	0.6%	Rank history: not on the FY2021–FY2022 lists, #35 in FY2024 and #23 in FY2025; up 447 since FY2022.
35	Okinawaken Sangyo Haikibutsushori Cooperative Association Top agencies USAF (Department of the Air Force)	$586,968	0.6%	Rank history: #57 in FY2021, #37 in FY2022, #57 in FY2024 and #52 in FY2025; up 2 since FY2022.
36	Meps GMBH Military Effective Projects & Services 2 awardees, including Meps GMBH and WC LOC Italia S.R.L. Top agencies Army (Department of the Army) USAF (Department of the Air Force) DECA (Defense Commissary Agency)	$572,622	0.6%	Rank history: #1 in FY2021, #33 in FY2022 and not on the FY2024–FY2025 lists; down 3 since FY2022.
37	Saudi Naval Support Co. Top agencies USAF (Department of the Air Force)	$557,001	0.6%	Rank history: #7 in FY2021, #10 in FY2022 and not on the FY2024–FY2025 lists; down 27 since FY2022.
38	US ECO Products Corp Top agencies USAF (Department of the Air Force) Army (Department of the Army) DOI (Department of the Interior)	$553,691	0.6%	Rank history: #37 in FY2021, #34 in FY2022 and not on the FY2024–FY2025 lists; down 4 since FY2022.
39	BPM Services Inc. Top agencies Army (Department of the Army) DOI (Department of the Interior) USDA (Department of Agriculture)	$546,453	0.6%	Rank history: #40 in FY2021, #61 in FY2022, #46 in FY2024 and #79 in FY2025; up 22 since FY2022.
40	4K Sanitation LLC Top agencies Navy (Department of the Navy) USAF (Department of the Air Force) Army (Department of the Army)	$509,695	0.5%	Rank history: not on the FY2021 list, #24 in FY2022, #40 in FY2024 and #47 in FY2025; down 16 since FY2022.
41	Cumberland Septic Services Inc. Top agencies Army (Department of the Army) DHA (Defense Health Agency) Navy (Department of the Navy)	$508,725	0.5%	Rank history: #51 in FY2021, #43 in FY2022, #39 in FY2024 and #44 in FY2025; up 2 since FY2022.
42	Providence Environmental Concepts and Services LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$503,208	0.5%	Rank history: #28 in FY2021, #39 in FY2022, #43 in FY2024 and #92 in FY2025; down 3 since FY2022.
43	Sierra Septic LLC Top agencies USDA (Department of Agriculture) Navy (Department of the Navy)	$485,774	0.5%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
44	Golden Lines Contracting Company Top agencies Army (Department of the Army)	$476,160	0.5%	Rank history: not on the FY2021 list, #74 in FY2022, #90 in FY2024 and not on the FY2025 list; up 30 since FY2022.
45	Dan Falkenstein Top agencies USDA (Department of Agriculture)	$473,871	0.5%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; up 127 since FY2022.
46	Mayes Septic & Port A Pots, LLC Top agencies DOI (Department of the Interior)	$470,270	0.5%	Rank history: not on the FY2021–FY2022 lists, #41 in FY2024 and #39 in FY2025; up 66 since FY2022.
47	Kyongjinkiup Co., Ltd. Top agencies Army (Department of the Army)	$454,867	0.5%	Rank history: #75 in FY2021, not on the FY2022 list, #70 in FY2024 and #66 in FY2025; up 89 since FY2022.
48	Sanford Federal, Inc. Top agencies DOI (Department of the Interior) Army (Department of the Army) VA (Department of Veterans Affairs)	$437,218	0.5%	Rank history: not on the FY2021–FY2022 lists, #91 in FY2024 and not on the FY2025 list; new.
49	DAE IL Sanitary Public Corporation Top agencies Army (Department of the Army)	$427,696	0.5%	Rank history: #65 in FY2021, #55 in FY2022, #80 in FY2024 and #62 in FY2025; up 6 since FY2022.
50	GPC Consolidated Reporting Top agencies USDA (Department of Agriculture)	$427,093	0.5%	Rank history: #20 in FY2021, #86 in FY2022 and not on the FY2024–FY2025 lists; up 36 since FY2022.
51	United Site National Services Company 4 awardees, including United Site Services of Maryland, Inc., United Site Services Northeast, Inc. and United Site Services, Inc. Top agencies Army (Department of the Army) DHS (Department of Homeland Security) DMA (Defense Media Activity)	$422,426	0.5%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
52	RTC Facilities Management Services LLC Top agencies USAF (Department of the Air Force)	$413,775	0.4%	Rank history: #21 in FY2021, #19 in FY2022 and not on the FY2024–FY2025 lists; down 33 since FY2022.
53	Ben Lujan Towing, Inc. Top agencies USAF (Department of the Air Force)	$406,616	0.4%	Rank history: not on the FY2021–FY2022 lists, #55 in FY2024 and #59 in FY2025; new.
54	Hosan Sanitation Co., Ltd. Top agencies Army (Department of the Army)	$393,761	0.4%	Rank history: #71 in FY2021, #29 in FY2022, #88 in FY2024 and #67 in FY2025; down 25 since FY2022.
55	Ivan's Site Services, Inc. Top agencies Army (Department of the Army) USAF (Department of the Air Force) DHS (Department of Homeland Security)	$393,396	0.4%	Rank history: #85 in FY2021, not on the FY2022 list and not on the FY2024–FY2025 lists; up 52 since FY2022.
56	K&H Environmental Services, LLC Top agencies Navy (Department of the Navy)	$389,864	0.4%	Rank history: not on the FY2021–FY2022 lists, #63 in FY2024 and #13 in FY2025; up 321 since FY2022.
57	LJH Services Inc. Top agencies DHS (Department of Homeland Security)	$367,495	0.4%	Rank history: #38 in FY2021, #16 in FY2022 and not on the FY2024–FY2025 lists; down 41 since FY2022.
58	Two-Tac LLC Top agencies Navy (Department of the Navy)	$365,917	0.4%	Rank history: not on the FY2021 list, #73 in FY2022 and not on the FY2024–FY2025 lists; up 15 since FY2022.
59	D&M Pumping LLC Top agencies USSOCOM (United States Special Operations Command) DOI (Department of the Interior) DOE (Department of Energy)	$345,009	0.4%	Rank history: #42 in FY2021, #50 in FY2022 and not on the FY2024–FY2025 lists; down 9 since FY2022.
60	Gulf Unity Company Top agencies USAF (Department of the Air Force)	$328,613	0.4%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
61	Fusionsite Clarksville LLC Top agencies Army (Department of the Army)	$319,694	0.3%	Rank history: not on the FY2021 list, #63 in FY2022, #60 in FY2024 and not on the FY2025 list; up 2 since FY2022.
62	United Site Services of California Inc. Top agencies Army (Department of the Army) USDA (Department of Agriculture) DLA (Defense Logistics Agency)	$309,689	0.3%	Rank history: #47 in FY2021, #84 in FY2022, not on the FY2024 list and #93 in FY2025; up 22 since FY2022.
63	Geranios Enterprises Inc. Top agencies USAF (Department of the Air Force)	$304,000	0.3%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; up 276 since FY2022.
64	Pine Rim Enterprises Inc. Top agencies USDA (Department of Agriculture)	$302,134	0.3%	Rank history: not on the FY2021–FY2022 lists, #58 in FY2024 and #22 in FY2025; new.
65	Jmak Services LLC Top agencies DHS (Department of Homeland Security)	$297,515	0.3%	Rank history: not on the FY2021 list, #41 in FY2022, #44 in FY2024 and not on the FY2025 list; down 24 since FY2022.
66	Jungers Resources LLC Top agencies DOI (Department of the Interior) USDA (Department of Agriculture)	$295,447	0.3%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
67	Brunson's Investment, LLC Top agencies DHS (Department of Homeland Security)	$284,175	0.3%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
68	Outbacks, Inc. Top agencies USDA (Department of Agriculture)	$283,985	0.3%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
69	Todo Mauleg Top agencies USAF (Department of the Air Force) Navy (Department of the Navy) Army (Department of the Army)	$278,170	0.3%	Rank history: #76 in FY2021, #95 in FY2022, #87 in FY2024 and #70 in FY2025; up 26 since FY2022.
70	Waste and Water Logistics, LLC Top agencies DOI (Department of the Interior)	$272,326	0.3%	Rank history: #93 in FY2021, #60 in FY2022, #34 in FY2024 and #38 in FY2025; down 10 since FY2022.
71	United Site Services, Inc. 7 awardees, including United Site Services of Florida, LLC, United Site Services of Maryland, Inc. and United Site Services Northeast, Inc. Top agencies DHS (Department of Homeland Security) Army (Department of the Army) USAF (Department of the Air Force)	$271,335	0.3%	Rank history: not on the FY2021 list, #38 in FY2022 and not on the FY2024–FY2025 lists; down 33 since FY2022.
72	Davis Water Service Inc. Top agencies VA (Department of Veterans Affairs)	$266,050	0.3%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
73	Hills Home Repair, LLC Top agencies USDA (Department of Agriculture)	$264,921	0.3%	Rank history: not on the FY2021 list, #28 in FY2022 and not on the FY2024–FY2025 lists; down 45 since FY2022.
74	Sierra Sanitation, Inc. Top agencies Army (Department of the Army) USDA (Department of Agriculture)	$254,154	0.3%	Rank history: not on the FY2021 list, #83 in FY2022, #99 in FY2024 and #73 in FY2025; up 9 since FY2022.
75	Bison Group, Inc. Top agencies DOI (Department of the Interior) USDA (Department of Agriculture) DLA (Defense Logistics Agency)	$252,635	0.3%	Rank history: #74 in FY2021, not on the FY2022 list and not on the FY2024–FY2025 lists; up 28 since FY2022.
76	Asap Inc Top agencies USDA (Department of Agriculture)	$248,586	0.3%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; up 35 since FY2022.
77	Red Orange North America Inc. Top agencies USAF (Department of the Air Force) DOI (Department of the Interior) VA (Department of Veterans Affairs)	$247,622	0.3%	Rank history: #44 in FY2021, #17 in FY2022, #73 in FY2024 and not on the FY2025 list; down 60 since FY2022.
78	Paula Watkins Top agencies Army (Department of the Army)	$245,149	0.3%	Rank history: #67 in FY2021, #80 in FY2022, #82 in FY2024 and #78 in FY2025; up 2 since FY2022.
79	Krsos LLC Top agencies USAF (Department of the Air Force)	$243,022	0.3%	Rank history: not on the FY2021–FY2022 lists, #85 in FY2024 and #86 in FY2025; new.
80	High Sierra Toilet Company, Inc. Top agencies USAF (Department of the Air Force)	$238,570	0.3%	Rank history: #59 in FY2021, #18 in FY2022 and not on the FY2024–FY2025 lists; down 62 since FY2022.
81	Sim Sanitation Inc. Top agencies USAF (Department of the Air Force)	$234,352	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; up 37 since FY2022.
82	Wise Environmental Solutions Inc Top agencies Army (Department of the Army)	$234,156	0.2%	Rank history: not on the FY2021–FY2022 lists, #31 in FY2024 and not on the FY2025 list; new.
83	Ridgecrest Septic Services Inc. Top agencies Navy (Department of the Navy)	$232,103	0.2%	Rank history: #62 in FY2021, #52 in FY2022, #89 in FY2024 and not on the FY2025 list; down 31 since FY2022.
84	AAA Pumping Service, Inc. Top agencies USDA (Department of Agriculture) DHS (Department of Homeland Security)	$225,383	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
85	Rep Holdings, Inc. Top agencies Army (Department of the Army) USAF (Department of the Air Force) USSOCOM (United States Special Operations Command)	$222,453	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; up 313 since FY2022.
86	TNT Waste Service LLC Top agencies DOI (Department of the Interior)	$221,740	0.2%	Rank history: not on the FY2021–FY2022 lists, not on the FY2024 list and #94 in FY2025; up 225 since FY2022.
87	Waste Management, Inc. Through Waste Management of Colorado, Inc. Top agencies DOI (Department of the Interior)	$218,134	0.2%	Rank history: #79 in FY2021, not on the FY2022 list and not on the FY2024–FY2025 lists; up 319 since FY2022.
88	Walters Services Inc. Top agencies Army (Department of the Army)	$217,657	0.2%	Rank history: not on the FY2021 list, #98 in FY2022, #75 in FY2024 and not on the FY2025 list; up 10 since FY2022.
89	Tidewater Marine International, Inc. Top agencies Navy (Department of the Navy)	$215,670	0.2%	Rank history: not on the FY2021 list, #79 in FY2022, #94 in FY2024 and #88 in FY2025; down 10 since FY2022.
90	Hanson Services LLC Top agencies USAF (Department of the Air Force)	$213,300	0.2%	Rank history: not on the FY2021–FY2022 lists, not on the FY2024 list and #90 in FY2025; up 266 since FY2022.
91	Paju Sanitation Corp. Top agencies Army (Department of the Army)	$212,890	0.2%	Rank history: #39 in FY2021, #58 in FY2022, #81 in FY2024 and not on the FY2025 list; down 33 since FY2022.
92	Redorange LLC Top agencies VA (Department of Veterans Affairs) USAF (Department of the Air Force) Navy (Department of the Navy)	$207,138	0.2%	Rank history: not on the FY2021–FY2022 lists, #67 in FY2024 and #87 in FY2025; new.
93	E. Stewart LLC Top agencies Army (Department of the Army)	$205,040	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
94	Clinkscales Portable Toilets, LLC Top agencies USDA (Department of Agriculture)	$204,734	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
95	Superior Sanitation, LLC Top agencies USDA (Department of Agriculture)	$200,486	0.2%	Rank history: not on the FY2021 list, #66 in FY2022, #52 in FY2024 and #63 in FY2025; down 29 since FY2022.
96	Chamberlin & Wingert Sanitary Services LLC Top agencies Army (Department of the Army)	$197,929	0.2%	Rank history: #58 in FY2021, #72 in FY2022 and not on the FY2024–FY2025 lists; down 24 since FY2022.
97	Portapros LLC Top agencies USAF (Department of the Air Force) USDA (Department of Agriculture)	$197,794	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; up 296 since FY2022.
98	Blue Nose It Solutions, Inc. Top agencies VA (Department of Veterans Affairs)	$195,025	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; up 12 since FY2022.
99	Namdo Sanitation Co. Ltd Top agencies Army (Department of the Army)	$194,099	0.2%	Rank history: #52 in FY2021, not on the FY2022 list, #61 in FY2024 and #71 in FY2025; up 129 since FY2022.
100	Straight Flush Drain Solutions, LLC Top agencies USAF (Department of the Air Force)	$191,000	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; up 64 since FY2022.

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100 of 607 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 $93.9 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 2023 ran Oct 1, 2022 – Sep 30, 2023. The Department of Defense reports its contract actions to FPDS about 90 days late, so a fiscal year is ranked once they're in, in February, and the list doesn't change after.
Rank changes compare with FY2022. "New" marks a company outside that period's top 500, and "Returned" one of those that was on an earlier fiscal year's list.
Rank lines show each company's rank on every fiscal year's list since FY2021, #1 at the top, on a scale that gives the top of the list more room. A dashed stretch spans years it wasn't on the list. The step from FY2022 takes the color of the rank change beside it.
Placeholder recipients FPDS uses when it names no company ("Miscellaneous Foreign Contractors" and the like) aren't ranked.

Quick answers

Who were the top 10 NAICS 562991 contractors in FY2023?

1. Major Contracting Services, Inc. ($4.15M), 2. Ronjon Rentals Inc ($3.98M), 3. Vantex Service Corporation ($3.33M), 4. Bucks Sanitary Service Inc. ($2.7M), 5. Krätz GMBH ($2.22M), 6. Ronjon Rentals Vantex Service Joint Venture ($1.95M), 7. Future Services General Trading & Contracting Co. ($1.91M), 8. B & B Portable Toilets LLC ($1.7M), 9. P.u. Septic Service, Inc. ($1.24M), 10. Skookum Educational Programs ($1.16M).

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