Top 100 Contractors in PSC B533: Water Quality Studies, FY2025

Name: Top 100 Contractors in PSC B533: Water Quality Studies, FY2025
Creator: GovTribe

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

The top 10 won 44% of FY2025 PSC B533 contract dollars

Contract obligations: $10,375,116 Net of deobligations, by contracts coded PSC B533
Contractors: 147 Parent companies with an obligation
Largest contractor: Phigenics LLC $960 thousand, 7.6% 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	Phigenics LLC Top agencies VA (Department of Veterans Affairs) DHA (Defense Health Agency)	$960,100	7.6%	Rank history: not on the FY2021–FY2023 lists and #9 in FY2024; up 8 since FY2024.
2	Sanco Laboratories Inc. Top agencies VA (Department of Veterans Affairs)	$921,319	7.3%	Rank history: not on the FY2021–FY2022 lists, #12 in FY2023 and #6 in FY2024; up 4 since FY2024.
3	Mabbett & Associates, Inc. Top agencies VA (Department of Veterans Affairs)	$842,323	6.6%	Rank history: #5 in FY2021, #6 in FY2022, #3 in FY2023 and #5 in FY2024; up 2 since FY2024.
4	Benham Design, LLC Top agencies USAF (Department of the Air Force)	$825,612	6.5%	Rank history: not on the FY2021–FY2024 lists; new.
5	JPI Construction LLC Top agencies USDA (Department of Agriculture)	$432,560	3.4%	Rank history: not on the FY2021–FY2024 lists; new.
6	Fluid Solutions LLC Top agencies DOS (Department of State)	$388,543	3.1%	Rank history: not on the FY2021–FY2023 lists and #7 in FY2024; up 1 since FY2024.
7	Optimum Environmental Corporation Top agencies DOI (Department of the Interior)	$296,864	2.3%	Rank history: not on the FY2021–FY2024 lists; new.
8	RTI Laboratories Inc. Top agencies DHA (Defense Health Agency)	$295,000	2.3%	Rank history: not on the FY2021–FY2023 lists and #1 in FY2024; down 7 since FY2024.
9	Pace Analytical Services LLC Top agencies Army (Department of the Army) DOI (Department of the Interior)	$286,360	2.3%	Rank history: #12 in FY2021, #27 in FY2022, #15 in FY2023 and #19 in FY2024; up 10 since FY2024.
10	Native Strategies, LLC Top agencies DOI (Department of the Interior)	$284,915	2.2%	Rank history: not on the FY2021 list, #1 in FY2022, #4 in FY2023 and #3 in FY2024; down 7 since FY2024.
11	Utah State University Top agencies DOI (Department of the Interior)	$277,441	2.2%	Rank history: not on the FY2021–FY2023 lists and #13 in FY2024; up 2 since FY2024.
12	Winergy LLC Top agencies VA (Department of Veterans Affairs)	$265,174	2.1%	Rank history: not on the FY2021 list, #58 in FY2022, #78 in FY2023 and #24 in FY2024; up 12 since FY2024.
13	Matrix Sciences International Inc. Top agencies DOI (Department of the Interior)	$263,584	2.1%	Rank history: #32 in FY2021, #12 in FY2022, #23 in FY2023 and #47 in FY2024; up 34 since FY2024.
14	Trustees of Indiana University Top agencies DOI (Department of the Interior)	$207,861	1.6%	Rank history: not on the FY2021–FY2023 lists and #20 in FY2024; up 6 since FY2024.
15	San Diego State University Foundation Top agencies Navy (Department of the Navy)	$186,745	1.5%	Rank history: not on the FY2021–FY2023 lists and #29 in FY2024; up 14 since FY2024.
16	Sure-Biochem Laboratories LLC Top agencies Army (Department of the Army)	$179,539	1.4%	Rank history: not on the FY2021–FY2022 lists, #67 in FY2023 and #12 in FY2024; down 4 since FY2024.
17	Ecolab Inc. Through Barclay Water Management, Inc. Top agencies VA (Department of Veterans Affairs) DOT (Department of Transportation)	$168,660	1.3%	Rank history: #46 in FY2021, not on the FY2022 list, #91 in FY2023 and not on the FY2024 list; returned.
18	Mdk, LLC Top agencies DOI (Department of the Interior)	$166,786	1.3%	Rank history: #34 in FY2021, #22 in FY2022, #20 in FY2023 and #21 in FY2024; up 3 since FY2024.
19	GD Resources, LLC Top agencies DOI (Department of the Interior)	$162,900	1.3%	Rank history: not on the FY2021–FY2024 lists; new.
20	William W Walker JR Top agencies DOI (Department of the Interior)	$145,000	1.1%	Rank history: not on the FY2021–FY2022 lists, #14 in FY2023 and #17 in FY2024; down 3 since FY2024.
21	Lab Leasing Co., Inc. Top agencies USDA (Department of Agriculture)	$135,518	1.1%	Rank history: not on the FY2021 list, #19 in FY2022, #24 in FY2023 and #23 in FY2024; up 2 since FY2024.
22	Business Resources of Long ISL Top agencies VA (Department of Veterans Affairs)	$131,290	1.0%	Rank history: not on the FY2021–FY2023 lists and #28 in FY2024; up 6 since FY2024.
23	Chugai Technos Corporation Top agencies Army (Department of the Army)	$125,689	1.0%	Rank history: not on the FY2021–FY2023 lists and #22 in FY2024; down 1 since FY2024.
24	Adirondack Environmental Services, Inc. Top agencies DOI (Department of the Interior)	$120,000	0.9%	Rank history: not on the FY2021–FY2024 lists; new.
25	Palmetto Consulting Engineering Group Inc. Top agencies Army (Department of the Army)	$108,696	0.9%	Rank history: #15 in FY2021, #37 in FY2022, #32 in FY2023 and #33 in FY2024; up 8 since FY2024.
26	Environmental Quality Laboratories Inc. Top agencies Army (Department of the Army) DOI (Department of the Interior)	$105,546	0.8%	Rank history: #28 in FY2021, #26 in FY2022, #52 in FY2023 and #26 in FY2024; unchanged since FY2024.
27	Unlimited Support Services LLC Top agencies DOJ (Department of Justice)	$104,997	0.8%	Rank history: not on the FY2021–FY2022 lists, #95 in FY2023 and #35 in FY2024; up 8 since FY2024.
28	D & D Laboratory LLC Top agencies VA (Department of Veterans Affairs) DHA (Defense Health Agency)	$103,547	0.8%	Rank history: #52 in FY2021, #31 in FY2022, #37 in FY2023 and #42 in FY2024; up 14 since FY2024.
29	Ocean Systems Laboratory Inc. Top agencies DOI (Department of the Interior) Army (Department of the Army)	$102,676	0.8%	Rank history: #25 in FY2021, #24 in FY2022, #35 in FY2023 and #41 in FY2024; up 12 since FY2024.
30	Pure H2O Systems, LLC Top agencies DOT (Department of Transportation)	$102,000	0.8%	Rank history: not on the FY2021–FY2024 lists; new.
31	Vitisystems, Inc. Top agencies DHS (Department of Homeland Security) DOI (Department of the Interior)	$97,740	0.8%	Rank history: #58 in FY2021 and not on the FY2022–FY2024 lists; up 122 since FY2024.
32	Cranmer Engineering, Inc. Top agencies Army (Department of the Army) DHA (Defense Health Agency) USDA (Department of Agriculture)	$96,728	0.8%	Rank history: not on the FY2021–FY2023 lists and #38 in FY2024; up 6 since FY2024.
33	Pollen Environmental, Llc. Top agencies USAF (Department of the Air Force)	$89,648	0.7%	Rank history: not on the FY2021–FY2023 lists and #36 in FY2024; up 3 since FY2024.
34	Eurofins Environment Testing Northern California LLC Top agencies DOI (Department of the Interior)	$88,165	0.7%	Rank history: not on the FY2021–FY2024 lists; new.
35	Hydrotech Water Solutions LLC Top agencies VA (Department of Veterans Affairs)	$88,002	0.7%	Rank history: not on the FY2021–FY2023 lists and #66 in FY2024; up 31 since FY2024.
36	Envirosource Corp. Top agencies DOI (Department of the Interior)	$84,868	0.7%	Rank history: #16 in FY2021, #14 in FY2022, #25 in FY2023 and not on the FY2024 list; returned.
37	County of Douglas Top agencies DOI (Department of the Interior)	$84,600	0.7%	Rank history: #14 in FY2021, #20 in FY2022, #36 in FY2023 and #78 in FY2024; up 41 since FY2024.
38	Water Treatment Services Inc. Top agencies VA (Department of Veterans Affairs)	$75,000	0.6%	Rank history: not on the FY2021–FY2024 lists; new.
39	Trichanalytics Inc. Top agencies DOI (Department of the Interior)	$66,860	0.5%	Rank history: not on the FY2021–FY2023 lists and #31 in FY2024; down 8 since FY2024.
40	Oregon State University Top agencies DOI (Department of the Interior)	$66,302	0.5%	Rank history: not on the FY2021–FY2023 lists and #57 in FY2024; up 17 since FY2024.
41	JW Environmental LLC Top agencies VA (Department of Veterans Affairs)	$64,962	0.5%	Rank history: not on the FY2021–FY2024 lists; new.
42	Black & Gold Technology LLC Top agencies Army (Department of the Army)	$64,670	0.5%	Rank history: not on the FY2021–FY2024 lists; new.
43	Premier Water & Energy Technology Inc. Top agencies Army (Department of the Army)	$62,500	0.5%	Rank history: #3 in FY2021, #9 in FY2022, #9 in FY2023 and #25 in FY2024; down 18 since FY2024.
44	Tshimakain Creek Labs LLC Top agencies Army (Department of the Army)	$61,640	0.5%	Rank history: not on the FY2021–FY2023 lists and #44 in FY2024; unchanged since FY2024.
45	Kane Environmental Inc Top agencies Navy (Department of the Navy)	$60,430	0.5%	Rank history: not on the FY2021–FY2024 lists; new.
46	Florida International University Top agencies DOI (Department of the Interior)	$54,984	0.4%	Rank history: #45 in FY2021, not on the FY2022–FY2023 lists and #53 in FY2024; up 7 since FY2024.
47	HGS Engineering Inc. Top agencies VA (Department of Veterans Affairs)	$54,955	0.4%	Rank history: #8 in FY2021, #11 in FY2022, #16 in FY2023 and not on the FY2024 list; returned.
48	University of Utah Top agencies DOI (Department of the Interior)	$53,773	0.4%	Rank history: not on the FY2021–FY2024 lists; new.
49	Evapotranspiration Plus LLC Top agencies DOI (Department of the Interior)	$52,500	0.4%	Rank history: #23 in FY2021 and not on the FY2022–FY2024 lists; returned.
50	Marine Taxonomic Services, Limited Top agencies DOI (Department of the Interior)	$49,814	0.4%	Rank history: not on the FY2021–FY2023 lists and #15 in FY2024; down 35 since FY2024.
51	Sociedade De Empreitadas E Trabalhos Hidraulicos, S.A. Top agencies DHA (Defense Health Agency)	$49,303	0.4%	Rank history: not on the FY2021–FY2023 lists and #37 in FY2024; down 14 since FY2024.
52	Watershed Assessment Associates LLC Top agencies DOI (Department of the Interior)	$45,637	0.4%	Rank history: not on the FY2021–FY2024 lists; new.
53	Babcock Laboratories, Inc. Top agencies USAF (Department of the Air Force)	$45,556	0.4%	Rank history: not on the FY2021 list, #42 in FY2022, #47 in FY2023 and #56 in FY2024; up 3 since FY2024.
54	Phycotech, Inc. Top agencies DOI (Department of the Interior)	$44,567	0.4%	Rank history: #41 in FY2021, #41 in FY2022, #43 in FY2023 and #63 in FY2024; up 9 since FY2024.
55	Cooper Zietz Engineers, Inc. Top agencies HHS (Department of Health and Human Services)	$40,569	0.3%	Rank history: not on the FY2021–FY2023 lists and #48 in FY2024; down 7 since FY2024.
56	Benjamin L. Reimer Top agencies DOI (Department of the Interior)	$39,885	0.3%	Rank history: not on the FY2021–FY2024 lists; new.
57	Madelyne Bates Top agencies DOI (Department of the Interior)	$39,885	0.3%	Rank history: not on the FY2021–FY2024 lists; new.
58	HAN Ping Huang & Associates, Inc. Top agencies DLA (Defense Logistics Agency)	$37,518	0.3%	Rank history: #97 in FY2021, #89 in FY2022, not on the FY2023 list and #60 in FY2024; up 2 since FY2024.
59	Division of Agriculture of the University of Arkansas Top agencies USDA (Department of Agriculture)	$35,192	0.3%	Rank history: not on the FY2021–FY2024 lists; new.
60	ECO Analysts, LLC Top agencies DOI (Department of the Interior)	$34,995	0.3%	Rank history: not on the FY2021 list, #52 in FY2022 and not on the FY2023–FY2024 lists; returned.
61	Ecolab Quimica LTDA Top agencies DOS (Department of State)	$33,912	0.3%	Rank history: not on the FY2021–FY2024 lists; new.
62	Energy Laboratories, Inc. Top agencies DOI (Department of the Interior) DOE (Department of Energy)	$31,898	0.3%	Rank history: #69 in FY2021, #62 in FY2022, #75 in FY2023 and #79 in FY2024; up 17 since FY2024.
63	Fruit Growers Laboratory, Inc. Top agencies DOI (Department of the Interior)	$31,074	0.2%	Rank history: #40 in FY2021, not on the FY2022 list, #27 in FY2023 and #34 in FY2024; down 29 since FY2024.
64	Analytical Services Corporation Top agencies DHA (Defense Health Agency)	$30,324	0.2%	Rank history: #49 in FY2021, #44 in FY2022, #42 in FY2023 and #67 in FY2024; up 3 since FY2024.
65	Bluegrass / Kesco, Inc. Top agencies DOJ (Department of Justice)	$30,000	0.2%	Rank history: not on the FY2021 list, #90 in FY2022 and not on the FY2023–FY2024 lists; up 62 since FY2024.
66	Love's Backflow Testing and Repair Services, Inc. Top agencies USAF (Department of the Air Force)	$29,750	0.2%	Rank history: not on the FY2021–FY2024 lists; new.
67	Davchem East Africa Limited Top agencies DOS (Department of State)	$29,747	0.2%	Rank history: not on the FY2021–FY2024 lists; new.
68	Triton Water LLC Top agencies HHS (Department of Health and Human Services)	$28,080	0.2%	Rank history: not on the FY2021–FY2023 lists and #71 in FY2024; up 3 since FY2024.
69	Riverfront Safety & Health, LC Top agencies VA (Department of Veterans Affairs)	$26,623	0.2%	Rank history: not on the FY2021–FY2023 lists and #83 in FY2024; up 14 since FY2024.
70	Fluid Handling LLC Through Evoqua Water Technologies LLC Top agencies VA (Department of Veterans Affairs)	$24,692	0.2%	Rank history: not on the FY2021–FY2024 lists; new.
71	Legend Technical Services of Arizona, Inc. Top agencies DHA (Defense Health Agency) DOI (Department of the Interior) IBWC (International Boundary and Water Commission U.S.-Mexico)	$24,189	0.2%	Rank history: #6 in FY2021, #10 in FY2022, #22 in FY2023 and #14 in FY2024; down 57 since FY2024.
72	Rhithron Associates Inc Top agencies DOI (Department of the Interior)	$24,110	0.2%	Rank history: not on the FY2021–FY2022 lists, #40 in FY2023 and #68 in FY2024; down 4 since FY2024.
73	BSA Environmental Services Inc. Top agencies DOI (Department of the Interior)	$24,004	0.2%	Rank history: #51 in FY2021, #25 in FY2022, #34 in FY2023 and #16 in FY2024; down 57 since FY2024.
74	Young's Water Services, LLC Top agencies USDA (Department of Agriculture)	$23,400	0.2%	Rank history: not on the FY2021–FY2024 lists; new.
75	DHL Analytical Inc. Top agencies DOI (Department of the Interior)	$22,993	0.2%	Rank history: not on the FY2021–FY2022 lists, #79 in FY2023 and #62 in FY2024; down 13 since FY2024.
76	Admiralty Environmental, LLC Top agencies Commerce (Department of Commerce)	$22,365	0.2%	Rank history: #91 in FY2021, not on the FY2022–FY2023 lists and #77 in FY2024; up 1 since FY2024.
77	Barclay Water Management, Inc. Top agencies DOT (Department of Transportation)	$22,250	0.2%	Rank history: not on the FY2021–FY2023 lists and #32 in FY2024; down 45 since FY2024.
78	Industrial Water Engineering Inc. Top agencies HHS (Department of Health and Human Services)	$21,297	0.2%	Rank history: not on the FY2021–FY2024 lists; new.
79	Normandeau Associates, Inc. Top agencies DOI (Department of the Interior)	$21,000	0.2%	Rank history: not on the FY2021–FY2024 lists; up 23 since FY2024.
80	Anatek Labs Inc. Top agencies DOI (Department of the Interior)	$20,919	0.2%	Rank history: not on the FY2021–FY2024 lists; up 42 since FY2024.
81	I-2-I Solutions, Inc. Top agencies Army (Department of the Army)	$20,860	0.2%	Rank history: not on the FY2021–FY2023 lists and #30 in FY2024; down 51 since FY2024.
82	Christian Pizana Rivas Top agencies DOI (Department of the Interior)	$20,000	0.2%	Rank history: not on the FY2021–FY2024 lists; up 46 since FY2024.
83	Herrett Thomas A Top agencies DOI (Department of the Interior)	$19,997	0.2%	Rank history: #75 in FY2021, #74 in FY2022, #84 in FY2023 and #82 in FY2024; down 1 since FY2024.
84	ALS Group USA Corp. Top agencies Army (Department of the Army)	$19,783	0.2%	Rank history: not on the FY2021–FY2022 lists, #49 in FY2023 and not on the FY2024 list; returned.
85	SGS North America Inc. Top agencies Treasury (Department of the Treasury) DHS (Department of Homeland Security)	$19,310	0.2%	Rank history: not on the FY2021–FY2024 lists; new.
86	Environmental Chemists Inc. Top agencies Navy (Department of the Navy)	$18,810	0.1%	Rank history: not on the FY2021 list, #68 in FY2022, #38 in FY2023 and #61 in FY2024; down 25 since FY2024.
87	Tet - Tauriainen Environmental Testing LLC Top agencies DOI (Department of the Interior)	$18,756	0.1%	Rank history: not on the FY2021–FY2023 lists and #90 in FY2024; up 3 since FY2024.
88	Thomas Sadekoski Top agencies DOI (Department of the Interior)	$17,182	0.1%	Rank history: not on the FY2021–FY2024 lists; up 15 since FY2024.
89	Microbac Laboratories Inc. Top agencies USDA (Department of Agriculture)	$17,031	0.1%	Rank history: #64 in FY2021, not on the FY2022 list, #90 in FY2023 and not on the FY2024 list; up 46 since FY2024.
90	Danaher Corporation Through Hach Company Top agencies DHA (Defense Health Agency)	$16,395	0.1%	Rank history: not on the FY2021–FY2023 lists and #94 in FY2024; up 4 since FY2024.
91	Gilbride's Aqua Service, LLC Top agencies DOI (Department of the Interior)	$16,075	0.1%	Rank history: not on the FY2021 list, #87 in FY2022, #97 in FY2023 and #97 in FY2024; up 6 since FY2024.
92	Environmental Science Corporation Top agencies Army (Department of the Army)	$15,920	0.1%	Rank history: #10 in FY2021, not on the FY2022 list, #51 in FY2023 and #93 in FY2024; up 1 since FY2024.
93	Western Water Consultants Inc. Top agencies DOI (Department of the Interior)	$14,931	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
94	Dellavalle Laboratory, Inc. Top agencies HHS (Department of Health and Human Services)	$14,906	0.1%	Rank history: not on the FY2021–FY2024 lists; up 11 since FY2024.
95	CT Laboratories, LLC Top agencies DOI (Department of the Interior)	$14,620	0.1%	Rank history: not on the FY2021–FY2022 lists, #98 in FY2023 and not on the FY2024 list; up 6 since FY2024.
96	Dawson Mcg, Inc. Top agencies EPA (Environmental Protection Agency)	$14,066	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
97	Eurofins Environment Testing Northwest, LLC Top agencies USDA (Department of Agriculture)	$11,561	0.1%	Rank history: not on the FY2021–FY2023 lists and #91 in FY2024; down 6 since FY2024.
98	Lucas Reiter Top agencies DOI (Department of the Interior)	$11,508	0.1%	Rank history: not on the FY2021–FY2024 lists; up 26 since FY2024.
99	William Seamans Top agencies DOI (Department of the Interior)	$11,508	0.1%	Rank history: not on the FY2021–FY2024 lists; up 26 since FY2024.
100	Zackary Althiser Top agencies DOI (Department of the Interior)	$11,508	0.1%	Rank history: not on the FY2021–FY2024 lists; new.

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100 of 147 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 $12.7 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 2025 ran Oct 1, 2024 – Sep 30, 2025. The Department of Defense reports its contract actions to FPDS about 90 days late, so a fiscal year is ranked once they're in, in February, and the list doesn't change after.
Rank changes compare with FY2024. "New" marks a company outside that period's top 500, and "Returned" one of those that was on an earlier fiscal year's list.
Rank lines show each company's rank on every fiscal year's list since FY2021, #1 at the top, on a scale that gives the top of the list more room. A dashed stretch spans years it wasn't on the list. The step from FY2024 takes the color of the rank change beside it.
Placeholder recipients FPDS uses when it names no company ("Miscellaneous Foreign Contractors" and the like) aren't ranked.

Quick answers

Who were the top 10 PSC B533 contractors in FY2025?

1. Phigenics LLC ($960K), 2. Sanco Laboratories Inc. ($921K), 3. Mabbett & Associates, Inc. ($842K), 4. Benham Design, LLC ($826K), 5. JPI Construction LLC ($433K), 6. Fluid Solutions LLC ($389K), 7. Optimum Environmental Corporation ($297K), 8. RTI Laboratories Inc. ($295K), 9. Pace Analytical Services LLC ($286K), 10. Native Strategies, LLC ($285K).

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