Top 100 Contractors in PSC B533: Water Quality Studies, FY2024

Name: Top 100 Contractors in PSC B533: Water Quality Studies, FY2024
Creator: GovTribe

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

The top 10 won 45% of FY2024 PSC B533 contract dollars

Contract obligations: $12,529,767 Net of deobligations, by contracts coded PSC B533
Contractors: 167 Parent companies with an obligation
Largest contractor: RTI Laboratories Inc. $1.46 million, 10.0% 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	RTI Laboratories Inc. Top agencies DOI (Department of the Interior) DHA (Defense Health Agency)	$1,458,937	10.0%	Rank history: not on the FY2021–FY2023 lists and #8 in FY2025; up 103 since FY2023.
2	Adanta Inc. Top agencies DOI (Department of the Interior)	$785,006	5.4%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
3	Native Strategies, LLC Top agencies DOI (Department of the Interior)	$749,176	5.1%	Rank history: not on the FY2021 list, #1 in FY2022, #4 in FY2023 and #10 in FY2025; up 1 since FY2023.
4	The Cadmus Group LLC Top agencies EPA (Environmental Protection Agency)	$700,000	4.8%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
5	Mabbett & Associates, Inc. Top agencies VA (Department of Veterans Affairs)	$508,734	3.5%	Rank history: #5 in FY2021, #6 in FY2022, #3 in FY2023 and #3 in FY2025; down 2 since FY2023.
6	Sanco Laboratories Inc. Top agencies VA (Department of Veterans Affairs)	$504,126	3.5%	Rank history: not on the FY2021–FY2022 lists, #12 in FY2023 and #2 in FY2025; up 6 since FY2023.
7	Fluid Solutions LLC Top agencies DOS (Department of State)	$495,653	3.4%	Rank history: not on the FY2021–FY2023 lists and #6 in FY2025; new.
8	Forsgren Associates Inc. Top agencies USDA (Department of Agriculture)	$495,190	3.4%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
9	Phigenics LLC Top agencies VA (Department of Veterans Affairs) DHA (Defense Health Agency)	$484,156	3.3%	Rank history: not on the FY2021–FY2023 lists and #1 in FY2025; new.
10	Eurofins Drinking Water and Wastewater West, LLC Top agencies DHA (Defense Health Agency) DOI (Department of the Interior)	$392,769	2.7%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
11	The Meridian Group DC LLC Top agencies Navy (Department of the Navy)	$299,309	2.0%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
12	Sure-Biochem Laboratories LLC Top agencies Army (Department of the Army)	$297,984	2.0%	Rank history: not on the FY2021–FY2022 lists, #67 in FY2023 and #16 in FY2025; up 55 since FY2023.
13	Utah State University Top agencies DOI (Department of the Interior)	$219,417	1.5%	Rank history: not on the FY2021–FY2023 lists and #11 in FY2025; new.
14	Legend Technical Services of Arizona, Inc. Top agencies IBWC (International Boundary and Water Commission U.S.-Mexico) USAF (Department of the Air Force)	$215,216	1.5%	Rank history: #6 in FY2021, #10 in FY2022, #22 in FY2023 and #71 in FY2025; up 8 since FY2023.
15	Marine Taxonomic Services, Limited Top agencies DOI (Department of the Interior)	$197,650	1.4%	Rank history: not on the FY2021–FY2023 lists and #50 in FY2025; new.
16	BSA Environmental Services Inc. Top agencies DOI (Department of the Interior)	$189,555	1.3%	Rank history: #51 in FY2021, #25 in FY2022, #34 in FY2023 and #73 in FY2025; up 18 since FY2023.
17	William W Walker JR Top agencies DOI (Department of the Interior)	$185,000	1.3%	Rank history: not on the FY2021–FY2022 lists, #14 in FY2023 and #20 in FY2025; down 3 since FY2023.
18	Venergy Group LLC Top agencies VA (Department of Veterans Affairs)	$179,052	1.2%	Rank history: #43 in FY2021, #36 in FY2022, not on the FY2023 list and not on the FY2025 list; returned.
19	Pace Analytical Services LLC 2 awardees Top agencies Army (Department of the Army) DOI (Department of the Interior)	$159,408	1.1%	Rank history: #12 in FY2021, #27 in FY2022, #15 in FY2023 and #9 in FY2025; down 4 since FY2023.
20	Trustees of Indiana University Top agencies DOI (Department of the Interior)	$150,185	1.0%	Rank history: not on the FY2021–FY2023 lists and #14 in FY2025; new.
21	Mdk, LLC Top agencies DOI (Department of the Interior)	$137,289	0.9%	Rank history: #34 in FY2021, #22 in FY2022, #20 in FY2023 and #18 in FY2025; down 1 since FY2023.
22	Chugai Technos Corporation Top agencies Army (Department of the Army)	$135,899	0.9%	Rank history: not on the FY2021–FY2023 lists and #23 in FY2025; new.
23	Lab Leasing Co., Inc. Top agencies USDA (Department of Agriculture)	$135,518	0.9%	Rank history: not on the FY2021 list, #19 in FY2022, #24 in FY2023 and #21 in FY2025; up 1 since FY2023.
24	Winergy LLC Top agencies VA (Department of Veterans Affairs)	$134,824	0.9%	Rank history: not on the FY2021 list, #58 in FY2022, #78 in FY2023 and #12 in FY2025; up 54 since FY2023.
25	Premier Water & Energy Technology Inc. Top agencies Army (Department of the Army)	$125,000	0.9%	Rank history: #3 in FY2021, #9 in FY2022, #9 in FY2023 and #43 in FY2025; down 16 since FY2023.
26	Environmental Quality Laboratories Inc 2 awardees Top agencies Army (Department of the Army) DOI (Department of the Interior)	$121,530	0.8%	Rank history: #28 in FY2021, #26 in FY2022, #52 in FY2023 and #26 in FY2025; up 26 since FY2023.
27	Fyve Star Inc. Top agencies USAF (Department of the Air Force)	$117,500	0.8%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
28	Business Resources of Long ISL Top agencies VA (Department of Veterans Affairs)	$114,653	0.8%	Rank history: not on the FY2021–FY2023 lists and #22 in FY2025; new.
29	San Diego State University Foundation Top agencies Navy (Department of the Navy)	$113,082	0.8%	Rank history: not on the FY2021–FY2023 lists and #15 in FY2025; new.
30	I-2-I Solutions, Inc. Top agencies USAF (Department of the Air Force) VA (Department of Veterans Affairs) USDA (Department of Agriculture)	$111,526	0.8%	Rank history: not on the FY2021–FY2023 lists and #81 in FY2025; new.
31	Trichanalytics Inc. Top agencies DOI (Department of the Interior)	$110,250	0.8%	Rank history: not on the FY2021–FY2023 lists and #39 in FY2025; new.
32	Barclay Water Management, Inc. Top agencies VA (Department of Veterans Affairs) DOT (Department of Transportation)	$107,799	0.7%	Rank history: not on the FY2021–FY2023 lists and #77 in FY2025; new.
33	Palmetto Consulting Engineering Group Inc. Top agencies Army (Department of the Army)	$105,636	0.7%	Rank history: #15 in FY2021, #37 in FY2022, #32 in FY2023 and #25 in FY2025; down 1 since FY2023.
34	Fruit Growers Laboratory, Inc. Top agencies DOI (Department of the Interior) Army (Department of the Army)	$103,676	0.7%	Rank history: #40 in FY2021, not on the FY2022 list, #27 in FY2023 and #63 in FY2025; down 7 since FY2023.
35	Unlimited Support Services LLC Top agencies DOJ (Department of Justice)	$100,648	0.7%	Rank history: not on the FY2021–FY2022 lists, #95 in FY2023 and #27 in FY2025; up 60 since FY2023.
36	Pollen Environmental, Llc. Top agencies USAF (Department of the Air Force)	$88,758	0.6%	Rank history: not on the FY2021–FY2023 lists and #33 in FY2025; new.
37	Sociedade De Empreitadas E Trabalhos Hidraulicos, S.A. Top agencies DHA (Defense Health Agency) USAF (Department of the Air Force)	$88,628	0.6%	Rank history: not on the FY2021–FY2023 lists and #51 in FY2025; new.
38	Cranmer Engineering, Inc. Top agencies Army (Department of the Army) USDA (Department of Agriculture)	$81,295	0.6%	Rank history: not on the FY2021–FY2023 lists and #32 in FY2025; new.
39	Pisces Molecular LLC Top agencies DOI (Department of the Interior)	$80,952	0.6%	Rank history: not on the FY2021–FY2022 lists, #58 in FY2023 and not on the FY2025 list; up 19 since FY2023.
40	Stantec Inc. Through Stantec Consulting Services Inc. Top agencies Navy (Department of the Navy)	$79,500	0.5%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
41	Ocean Systems Laboratory Inc. Top agencies DOI (Department of the Interior) Army (Department of the Army)	$79,211	0.5%	Rank history: #25 in FY2021, #24 in FY2022, #35 in FY2023 and #29 in FY2025; down 6 since FY2023.
42	D & D Laboratory LLC 2 awardees Top agencies VA (Department of Veterans Affairs) DHA (Defense Health Agency)	$68,138	0.5%	Rank history: #52 in FY2021, #31 in FY2022, #37 in FY2023 and #28 in FY2025; down 5 since FY2023.
43	Caldaia Controls LLC Top agencies VA (Department of Veterans Affairs)	$67,700	0.5%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
44	Tshimakain Creek Labs LLC Top agencies Army (Department of the Army)	$63,916	0.4%	Rank history: not on the FY2021–FY2023 lists and #44 in FY2025; up 109 since FY2023.
45	Integrated Analytical Laboratories LLC Top agencies VA (Department of Veterans Affairs)	$62,577	0.4%	Rank history: #42 in FY2021, #32 in FY2022, #48 in FY2023 and not on the FY2025 list; up 3 since FY2023.
46	County of Barnstable Top agencies EPA (Environmental Protection Agency)	$61,200	0.4%	Rank history: #20 in FY2021, not on the FY2022 list, #41 in FY2023 and not on the FY2025 list; down 5 since FY2023.
47	Matrix Sciences International Inc. Top agencies DOI (Department of the Interior)	$57,567	0.4%	Rank history: #32 in FY2021, #12 in FY2022, #23 in FY2023 and #13 in FY2025; down 24 since FY2023.
48	Cooper Zietz Engineers, Inc. Top agencies HHS (Department of Health and Human Services)	$54,910	0.4%	Rank history: not on the FY2021–FY2023 lists and #55 in FY2025; new.
49	Symbio Laboratories US, LLC Top agencies DOI (Department of the Interior)	$54,729	0.4%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
50	DCS Infrastructure, LLC Top agencies VA (Department of Veterans Affairs)	$52,500	0.4%	Rank history: #31 in FY2021, #28 in FY2022, #33 in FY2023 and not on the FY2025 list; down 17 since FY2023.
51	NCH Corporation Through Chem-Aqua Inc. Top agencies VA (Department of Veterans Affairs)	$50,000	0.3%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
52	Strategic Support Corporation, Inc. Top agencies Army (Department of the Army)	$49,746	0.3%	Rank history: #44 in FY2021, #40 in FY2022, #45 in FY2023 and not on the FY2025 list; down 7 since FY2023.
53	Florida International University Top agencies DOI (Department of the Interior)	$49,418	0.3%	Rank history: #45 in FY2021, not on the FY2022–FY2023 lists and #46 in FY2025; returned.
54	Wilson Water Group LLC Top agencies DOI (Department of the Interior)	$48,300	0.3%	Rank history: #39 in FY2021, #39 in FY2022, #92 in FY2023 and not on the FY2025 list; up 38 since FY2023.
55	Oregon University System Through Oregon State University Top agencies DOI (Department of the Interior)	$45,721	0.3%	Rank history: #56 in FY2021, #15 in FY2022, #26 in FY2023 and not on the FY2025 list; down 29 since FY2023.
56	Babcock Laboratories, Inc. Top agencies USAF (Department of the Air Force)	$45,556	0.3%	Rank history: not on the FY2021 list, #42 in FY2022, #47 in FY2023 and #53 in FY2025; down 9 since FY2023.
57	Oregon State University Top agencies DOI (Department of the Interior)	$43,048	0.3%	Rank history: not on the FY2021–FY2023 lists and #40 in FY2025; new.
58	Nancy Miller Top agencies DOI (Department of the Interior)	$42,145	0.3%	Rank history: #35 in FY2021, #29 in FY2022, not on the FY2023 list and not on the FY2025 list; returned.
59	Ironwood Well Service LLC Top agencies DOI (Department of the Interior)	$42,135	0.3%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
60	HAN Ping Huang & Associates, Inc. Top agencies DLA (Defense Logistics Agency)	$41,915	0.3%	Rank history: #97 in FY2021, #89 in FY2022, not on the FY2023 list and #58 in FY2025; up 86 since FY2023.
61	Environmental Chemists Inc. Top agencies Navy (Department of the Navy)	$41,325	0.3%	Rank history: not on the FY2021 list, #68 in FY2022, #38 in FY2023 and #86 in FY2025; down 23 since FY2023.
62	DHL Analytical Inc. Top agencies DOI (Department of the Interior)	$38,755	0.3%	Rank history: not on the FY2021–FY2022 lists, #79 in FY2023 and #75 in FY2025; up 17 since FY2023.
63	Phycotech, Inc. Top agencies DOI (Department of the Interior)	$35,277	0.2%	Rank history: #41 in FY2021, #41 in FY2022, #43 in FY2023 and #54 in FY2025; down 20 since FY2023.
64	Arkansas University Of Through Division of Agriculture of the University of Arkansas Top agencies USDA (Department of Agriculture)	$32,718	0.2%	Rank history: not on the FY2021–FY2022 lists, #71 in FY2023 and not on the FY2025 list; up 7 since FY2023.
65	Fondriest Environmental, Inc. Top agencies DOI (Department of the Interior)	$31,428	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
66	Hydrotech Water Solutions LLC Top agencies VA (Department of Veterans Affairs)	$28,860	0.2%	Rank history: not on the FY2021–FY2023 lists and #35 in FY2025; new.
67	Analytical Services Corporation 2 awardees Top agencies USAF (Department of the Air Force) EPA (Environmental Protection Agency)	$28,256	0.2%	Rank history: #49 in FY2021, #44 in FY2022, #42 in FY2023 and #64 in FY2025; down 25 since FY2023.
68	Rhithron Associates Inc Top agencies DOI (Department of the Interior)	$28,170	0.2%	Rank history: not on the FY2021–FY2022 lists, #40 in FY2023 and #72 in FY2025; down 28 since FY2023.
69	Synergetic Business Solutions LLC Top agencies USDA (Department of Agriculture)	$28,031	0.2%	Rank history: not on the FY2021 list, #57 in FY2022, not on the FY2023 list and not on the FY2025 list; returned.
70	Umpqua Research Company Top agencies Army (Department of the Army)	$27,928	0.2%	Rank history: not on the FY2021–FY2022 lists, #53 in FY2023 and not on the FY2025 list; down 17 since FY2023.
71	Triton Water LLC Top agencies HHS (Department of Health and Human Services)	$27,000	0.2%	Rank history: not on the FY2021–FY2023 lists and #68 in FY2025; new.
72	Ruby Yaritza Hurtado Top agencies DOI (Department of the Interior)	$25,000	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
73	Susan Diane Lederer Top agencies DOI (Department of the Interior)	$25,000	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
74	Western Water Consultants, Inc. Top agencies DOI (Department of the Interior)	$24,885	0.2%	Rank history: not on the FY2021 list, #55 in FY2022, #96 in FY2023 and not on the FY2025 list; up 22 since FY2023.
75	Industrial Boiler & Mechanical Company, Inc. Top agencies DOJ (Department of Justice)	$23,601	0.2%	Rank history: not on the FY2021–FY2022 lists, #13 in FY2023 and not on the FY2025 list; down 62 since FY2023.
76	Terraphase Engineering Inc. Top agencies HHS (Department of Health and Human Services)	$23,118	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
77	Admiralty Environmental, LLC Top agencies Commerce (Department of Commerce)	$21,975	0.2%	Rank history: #91 in FY2021, not on the FY2022–FY2023 lists and #76 in FY2025; returned.
78	County of Douglas Top agencies DOI (Department of the Interior)	$21,792	0.1%	Rank history: #14 in FY2021, #20 in FY2022, #36 in FY2023 and #37 in FY2025; down 42 since FY2023.
79	Energy Laboratories, Inc. Top agencies DOI (Department of the Interior)	$21,142	0.1%	Rank history: #69 in FY2021, #62 in FY2022, #75 in FY2023 and #62 in FY2025; down 4 since FY2023.
80	Inspection Experts Inc. Top agencies USDA (Department of Agriculture)	$20,415	0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
81	Spring Street Analytical LLC Top agencies USDA (Department of Agriculture)	$20,330	0.1%	Rank history: not on the FY2021 list, #83 in FY2022, not on the FY2023 list and not on the FY2025 list; returned.
82	Herrett Thomas A Top agencies DOI (Department of the Interior)	$20,160	0.1%	Rank history: #75 in FY2021, #74 in FY2022, #84 in FY2023 and #83 in FY2025; up 2 since FY2023.
83	Riverfront Safety & Health, LC Top agencies VA (Department of Veterans Affairs)	$20,023	0.1%	Rank history: not on the FY2021–FY2023 lists and #69 in FY2025; new.
84	Pennington & Associates, Inc. Top agencies USDA (Department of Agriculture)	$20,000	0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
85	North Carolina Department of Environmental Quality Top agencies DOI (Department of the Interior)	$20,000	0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
86	KIM R Albers Top agencies DOJ (Department of Justice)	$18,900	0.1%	Rank history: #94 in FY2021, #94 in FY2022, not on the FY2023 list and not on the FY2025 list; up 21 since FY2023.
87	Wayne State University Top agencies DOI (Department of the Interior)	$18,240	0.1%	Rank history: not on the FY2021–FY2022 lists, #57 in FY2023 and not on the FY2025 list; down 30 since FY2023.
88	Aquatics Associates Inc. Top agencies USDA (Department of Agriculture)	$18,000	0.1%	Rank history: not on the FY2021 list, #82 in FY2022, #88 in FY2023 and not on the FY2025 list; unchanged since FY2023.
89	Per-Geesh Construction Corporation Top agencies HHS (Department of Health and Human Services)	$17,694	0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
90	Tet - Tauriainen Environmental Testing LLC Top agencies DOI (Department of the Interior)	$17,197	0.1%	Rank history: not on the FY2021–FY2023 lists and #87 in FY2025; new.
91	Eurofins Environment Testing Northwest, LLC Top agencies USDA (Department of Agriculture)	$17,000	0.1%	Rank history: not on the FY2021–FY2023 lists and #97 in FY2025; up 27 since FY2023.
92	Elsa Harrison Top agencies DOI (Department of the Interior)	$16,668	0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
93	Environmental Science Corporation Top agencies Army (Department of the Army)	$16,455	0.1%	Rank history: #10 in FY2021, not on the FY2022 list, #51 in FY2023 and #92 in FY2025; down 42 since FY2023.
94	Danaher Corporation Through Hach Company Top agencies DHA (Defense Health Agency)	$15,764	0.1%	Rank history: not on the FY2021–FY2023 lists and #90 in FY2025; new.
95	Enrich Products, Inc. Top agencies VA (Department of Veterans Affairs)	$15,720	0.1%	Rank history: #88 in FY2021, #79 in FY2022, #80 in FY2023 and not on the FY2025 list; down 15 since FY2023.
96	EVA Wilson Top agencies DOI (Department of the Interior)	$15,696	0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
97	Gilbride's Aqua Service, LLC Top agencies DOI (Department of the Interior)	$13,950	0.1%	Rank history: not on the FY2021 list, #87 in FY2022, #97 in FY2023 and #91 in FY2025; unchanged since FY2023.
98	Chesapeake Environmental Lab Inc. Top agencies Navy (Department of the Navy)	$13,883	0.1%	Rank history: not on the FY2021–FY2022 lists, #99 in FY2023 and not on the FY2025 list; up 1 since FY2023.
99	University of California, Davis Top agencies DOI (Department of the Interior)	$13,560	0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
100	Maanal Chowdhury Top agencies DOI (Department of the Interior)	$13,559	0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.

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100 of 167 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 $14.6 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 2024 ran Oct 1, 2023 – Sep 30, 2024. The Department of Defense reports its contract actions to FPDS about 90 days late, so a fiscal year is ranked once they're in, in February, and the list doesn't change after.
Rank changes compare with FY2023. "New" marks a company outside that period's top 500, and "Returned" one of those that was on an earlier fiscal year's list.
Rank lines show each company's rank on every fiscal year's list since FY2021, #1 at the top, on a scale that gives the top of the list more room. A dashed stretch spans years it wasn't on the list. The step from FY2023 takes the color of the rank change beside it.
Placeholder recipients FPDS uses when it names no company ("Miscellaneous Foreign Contractors" and the like) aren't ranked.

Quick answers

Who were the top 10 PSC B533 contractors in FY2024?

1. RTI Laboratories Inc. ($1.46M), 2. Adanta Inc. ($785K), 3. Native Strategies, LLC ($749K), 4. The Cadmus Group LLC ($700K), 5. Mabbett & Associates, Inc. ($509K), 6. Sanco Laboratories Inc. ($504K), 7. Fluid Solutions LLC ($496K), 8. Forsgren Associates Inc. ($495K), 9. Phigenics LLC ($484K), 10. Eurofins Drinking Water and Wastewater West, LLC ($393K).

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