Top 100 Contractors in PSC B533: Water Quality Studies, FY2021

Name: Top 100 Contractors in PSC B533: Water Quality Studies, FY2021
Creator: GovTribe

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

The top 10 won 47% of FY2021 PSC B533 contract dollars

Contract obligations: $9,028,548 Net of deobligations, by contracts coded PSC B533
Contractors: 143 Parent companies with an obligation
Largest contractor: Aptim Federal Services LLC $699 thousand, 7.3% 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	Aptim Federal Services LLC Top agencies Army (Department of the Army)	$699,475	7.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
2	Camp Dresser & Mckee Inc. Through CDM Federal Programs Corporation Top agencies VA (Department of Veterans Affairs)	$688,643	7.2%	Rank history: #4 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
3	Premier Water & Energy Technology Inc. Top agencies Army (Department of the Army)	$558,708	5.8%	Rank history: #9 in FY2022, #9 in FY2023, #25 in FY2024 and #43 in FY2025; unchanged since FY2020.
4	BNP Paribas Through Eurofins Drinking Water and Wastewater West, LLC Top agencies Army (Department of the Army) DOI (Department of the Interior)	$556,133	5.8%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
5	Mabbett & Associates, Inc. Top agencies VA (Department of Veterans Affairs)	$476,829	5.0%	Rank history: #6 in FY2022, #3 in FY2023, #5 in FY2024 and #3 in FY2025; down 3 since FY2020.
6	Legend Technical Services of Arizona, Inc. Top agencies IBWC (International Boundary and Water Commission U.S.-Mexico) USAF (Department of the Air Force)	$346,480	3.6%	Rank history: #10 in FY2022, #22 in FY2023, #14 in FY2024 and #71 in FY2025; unchanged since FY2020.
7	Steris Corporation Top agencies VA (Department of Veterans Affairs)	$331,266	3.4%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
8	HGS Engineering Inc. Top agencies VA (Department of Veterans Affairs)	$329,830	3.4%	Rank history: #11 in FY2022, #16 in FY2023, not on the FY2024 list and #47 in FY2025; down 4 since FY2020.
9	Enviroscience Inc. Top agencies DOI (Department of the Interior)	$254,833	2.7%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
10	Environmental Science Corporation Top agencies Army (Department of the Army)	$239,373	2.5%	Rank history: not on the FY2022 list, #51 in FY2023, #93 in FY2024 and #92 in FY2025; up 1 since FY2020.
11	Basic Laboratory, Inc. Top agencies DOI (Department of the Interior)	$187,500	2.0%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
12	Pace Analytical Services LLC Top agencies Army (Department of the Army) DOI (Department of the Interior)	$136,091	1.4%	Rank history: #27 in FY2022, #15 in FY2023, #19 in FY2024 and #9 in FY2025; up 5 since FY2020.
13	Kuna Engineering, LLC Top agencies DOI (Department of the Interior)	$132,625	1.4%	Rank history: #43 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
14	County of Douglas Top agencies DOI (Department of the Interior)	$128,144	1.3%	Rank history: #20 in FY2022, #36 in FY2023, #78 in FY2024 and #37 in FY2025; down 1 since FY2020.
15	Palmetto Consulting Engineering Group Inc. Top agencies Army (Department of the Army)	$123,939	1.3%	Rank history: #37 in FY2022, #32 in FY2023, #33 in FY2024 and #25 in FY2025; down 1 since FY2020.
16	Envirosource Corp. Top agencies DOI (Department of the Interior)	$123,706	1.3%	Rank history: #14 in FY2022, #25 in FY2023, not on the FY2024 list and #36 in FY2025; up 73 since FY2020.
17	Agriculture and Priority Pollutants Laboratories, LLC Top agencies DOI (Department of the Interior)	$115,000	1.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
18	Bric LLC Top agencies DOI (Department of the Interior)	$109,179	1.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
19	Aquatic Consulting & Testing, Inc. Top agencies VA (Department of Veterans Affairs)	$105,820	1.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
20	County of Barnstable Top agencies EPA (Environmental Protection Agency)	$105,756	1.1%	Rank history: not on the FY2022 list, #41 in FY2023, #46 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
21	Chugai Technos Corporation Top agencies Army (Department of the Army)	$105,550	1.1%	Rank history: #18 in FY2022, #29 in FY2023 and not on the FY2024–FY2025 lists; down 6 since FY2020.
22	A. Morton Thomas and Associates, Inc. Top agencies GSA (General Services Administration)	$96,100	1.0%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
23	Evapotranspiration Plus LLC Top agencies DOI (Department of the Interior)	$89,750	0.9%	Rank history: not on the FY2022–FY2024 lists and #49 in FY2025; down 3 since FY2020.
24	The Regents of the University of Colorado Top agencies DOI (Department of the Interior)	$87,508	0.9%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
25	Ocean Systems Laboratory Inc. Top agencies DOI (Department of the Interior) Army (Department of the Army)	$87,115	0.9%	Rank history: #24 in FY2022, #35 in FY2023, #41 in FY2024 and #29 in FY2025; up 29 since FY2020.
26	Hawaii International Environmental Services Inc. Top agencies Navy (Department of the Navy)	$84,792	0.9%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
27	GZ Industrial Microbe Testing Center Top agencies DOS (Department of State)	$79,411	0.8%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
28	Environmental Quality Laboratories Inc. Top agencies Army (Department of the Army) DOI (Department of the Interior)	$79,143	0.8%	Rank history: #26 in FY2022, #52 in FY2023, #26 in FY2024 and #26 in FY2025; down 7 since FY2020.
29	Phigenics LLC Top agencies VA (Department of Veterans Affairs) DHA (Defense Health Agency)	$79,019	0.8%	Rank history: #17 in FY2022, #8 in FY2023 and not on the FY2024–FY2025 lists; down 21 since FY2020.
30	Laura Michelle Demott Top agencies DOI (Department of the Interior)	$78,354	0.8%	Rank history: #76 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
31	DCS Infrastructure, LLC Top agencies VA (Department of Veterans Affairs)	$75,750	0.8%	Rank history: #28 in FY2022, #33 in FY2023, #50 in FY2024 and not on the FY2025 list; up 5 since FY2020.
32	Matrix Sciences International Inc. Top agencies DOI (Department of the Interior)	$75,528	0.8%	Rank history: #12 in FY2022, #23 in FY2023, #47 in FY2024 and #13 in FY2025; new, not ranked in FY2020.
33	Northern Lake Service Inc. Top agencies USDA (Department of Agriculture)	$72,934	0.8%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
34	Mdk, LLC Top agencies DOI (Department of the Interior)	$72,299	0.8%	Rank history: #22 in FY2022, #20 in FY2023, #21 in FY2024 and #18 in FY2025; up 38 since FY2020.
35	Nancy Miller Top agencies DOI (Department of the Interior)	$69,558	0.7%	Rank history: #29 in FY2022, not on the FY2023 list, #58 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
36	Ars Analytical, LLC Top agencies USAF (Department of the Air Force)	$69,431	0.7%	Rank history: #30 in FY2022 and not on the FY2023–FY2025 lists; down 14 since FY2020.
37	Brian Tornabene Top agencies DOI (Department of the Interior)	$69,368	0.7%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
38	Attagene Inc. Top agencies DOI (Department of the Interior)	$69,360	0.7%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
39	Wilson Water Group LLC Top agencies DOI (Department of the Interior)	$69,015	0.7%	Rank history: #39 in FY2022, #92 in FY2023, #54 in FY2024 and not on the FY2025 list; down 14 since FY2020.
40	Fruit Growers Laboratory, Inc. Top agencies DOI (Department of the Interior) Army (Department of the Army)	$68,641	0.7%	Rank history: not on the FY2022 list, #27 in FY2023, #34 in FY2024 and #63 in FY2025; down 7 since FY2020.
41	Phycotech, Inc. Top agencies DOI (Department of the Interior)	$61,855	0.6%	Rank history: #41 in FY2022, #43 in FY2023, #63 in FY2024 and #54 in FY2025; down 14 since FY2020.
42	Integrated Analytical Laboratories LLC Top agencies VA (Department of Veterans Affairs)	$59,595	0.6%	Rank history: #32 in FY2022, #48 in FY2023, #45 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
43	Venergy Group LLC Top agencies VA (Department of Veterans Affairs)	$50,836	0.5%	Rank history: #36 in FY2022, not on the FY2023 list, #18 in FY2024 and not on the FY2025 list; down 13 since FY2020.
44	Strategic Support Corporation, Inc. Top agencies Army (Department of the Army)	$49,746	0.5%	Rank history: #40 in FY2022, #45 in FY2023, #52 in FY2024 and not on the FY2025 list; down 16 since FY2020.
45	Florida International University Top agencies DOI (Department of the Interior)	$49,608	0.5%	Rank history: not on the FY2022–FY2023 lists, #53 in FY2024 and #46 in FY2025; new, not ranked in FY2020.
46	Ecolab Inc. 2 awardees, including Championx LLC and Nalco Philippines Inc. Top agencies VA (Department of Veterans Affairs) DOJ (Department of Justice) DOS (Department of State)	$47,672	0.5%	Rank history: not on the FY2022 list, #91 in FY2023, not on the FY2024 list and #17 in FY2025; up 25 since FY2020.
47	Credere Associates, LLC Top agencies USAF (Department of the Air Force)	$44,113	0.5%	Rank history: #46 in FY2022, #56 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
48	Auburn University Top agencies HHS (Department of Health and Human Services)	$43,829	0.5%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
49	Analytical Services Corporation Top agencies USAF (Department of the Air Force) USSOCOM (United States Special Operations Command)	$43,823	0.5%	Rank history: #44 in FY2022, #42 in FY2023, #67 in FY2024 and #64 in FY2025; down 18 since FY2020.
50	Waterrock Environmental, Inc. Top agencies Army (Department of the Army)	$40,380	0.4%	Rank history: #69 in FY2022 and not on the FY2023–FY2025 lists; down 13 since FY2020.
51	BSA Environmental Services Inc. Top agencies DOI (Department of the Interior)	$38,449	0.4%	Rank history: #25 in FY2022, #34 in FY2023, #16 in FY2024 and #73 in FY2025; down 33 since FY2020.
52	D & D Laboratory LLC Top agencies VA (Department of Veterans Affairs)	$38,439	0.4%	Rank history: #31 in FY2022, #37 in FY2023, #42 in FY2024 and #28 in FY2025; up 17 since FY2020.
53	Rainwater Management Solutions, Inc. Top agencies GSA (General Services Administration)	$38,310	0.4%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
54	Socio-Ecological Concepts LLC Top agencies DOI (Department of the Interior)	$36,358	0.4%	Rank history: #49 in FY2022 and not on the FY2023–FY2025 lists; down 10 since FY2020.
55	Lucia, Isabella Top agencies DOI (Department of the Interior)	$35,652	0.4%	Rank history: not on the FY2022–FY2025 lists; up 10 since FY2020.
56	Oregon University System Through Oregon State University Top agencies DOI (Department of the Interior)	$35,652	0.4%	Rank history: #15 in FY2022, #26 in FY2023, #55 in FY2024 and not on the FY2025 list; down 5 since FY2020.
57	Kris Bass Engineering, PLLC Top agencies DOI (Department of the Interior)	$35,000	0.4%	Rank history: #71 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
58	Vitisystems, Inc. Top agencies DOI (Department of the Interior)	$35,000	0.4%	Rank history: not on the FY2022–FY2024 lists and #31 in FY2025; new, not ranked in FY2020.
59	Environmental Monitoring and Technologies, LLC Top agencies DOI (Department of the Interior)	$33,443	0.3%	Rank history: not on the FY2022–FY2025 lists; down 40 since FY2020.
60	Astbury Water Technology Inc. Top agencies DOT (Department of Transportation)	$33,012	0.3%	Rank history: not on the FY2022 list, #68 in FY2023 and not on the FY2024–FY2025 lists; down 11 since FY2020.
61	Specpro Professional Services, LLC Top agencies Navy (Department of the Navy)	$32,939	0.3%	Rank history: not on the FY2022–FY2025 lists; down 45 since FY2020.
62	University System of Maryland Through University of Maryland Center for Environmental Science Top agencies DOI (Department of the Interior)	$32,177	0.3%	Rank history: #50 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
63	Nippon Bldg.care Limited Top agencies Army (Department of the Army)	$31,976	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
64	Microbac Laboratories Inc. Top agencies DHA (Defense Health Agency) Army (Department of the Army)	$29,894	0.3%	Rank history: not on the FY2022 list, #90 in FY2023, not on the FY2024 list and #89 in FY2025; down 12 since FY2020.
65	Kristy Sullivan Top agencies DOI (Department of the Interior)	$26,320	0.3%	Rank history: #75 in FY2022 and not on the FY2023–FY2025 lists; down 30 since FY2020.
66	Texas TECH University System Top agencies Army (Department of the Army)	$26,250	0.3%	Rank history: not on the FY2022–FY2025 lists; up 16 since FY2020.
67	Eurofins Analytics, LLC Top agencies Army (Department of the Army) VA (Department of Veterans Affairs)	$26,192	0.3%	Rank history: not on the FY2022–FY2025 lists; up 63 since FY2020.
68	Lab / Cor Inc. Top agencies DOI (Department of the Interior)	$24,925	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
69	Energy Laboratories, Inc. Top agencies DOI (Department of the Interior) Army (Department of the Army)	$22,930	0.2%	Rank history: #62 in FY2022, #75 in FY2023, #79 in FY2024 and #62 in FY2025; up 4 since FY2020.
70	Martel Laboratories Jds, Inc. Top agencies Navy (Department of the Navy)	$22,761	0.2%	Rank history: #59 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
71	Alpha Analytical Laboratories, Inc. Top agencies DOI (Department of the Interior)	$20,000	0.2%	Rank history: #72 in FY2022, #85 in FY2023 and not on the FY2024–FY2025 lists; down 45 since FY2020.
72	Mccampbell Analytical Incorporated Top agencies DOI (Department of the Interior)	$20,000	0.2%	Rank history: not on the FY2022 list, #59 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
73	Woods Hole Oceanographic Institution Top agencies DOI (Department of the Interior)	$19,920	0.2%	Rank history: not on the FY2022–FY2025 lists; up 11 since FY2020.
74	Esi-Atc JV LLC Top agencies Army (Department of the Army)	$19,657	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
75	Herrett Thomas A Top agencies DOI (Department of the Interior)	$19,008	0.2%	Rank history: #74 in FY2022, #84 in FY2023, #82 in FY2024 and #83 in FY2025; down 12 since FY2020.
76	Eurofins Scientific SE Through Eurofins Environment Testing Southwest, LLC Top agencies DOI (Department of the Interior)	$18,988	0.2%	Rank history: #5 in FY2022, #11 in FY2023 and not on the FY2024–FY2025 lists; down 75 since FY2020.
77	Fennelly, Patrick Top agencies DOI (Department of the Interior)	$18,490	0.2%	Rank history: not on the FY2022–FY2025 lists; down 21 since FY2020.
78	Meca Consulting Inc. Top agencies VA (Department of Veterans Affairs)	$17,440	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
79	SAK Environmental, LLC Top agencies USAF (Department of the Air Force)	$17,149	0.2%	Rank history: not on the FY2022–FY2025 lists; down 33 since FY2020.
80	Aviate Enterprises, Inc. Top agencies VA (Department of Veterans Affairs)	$16,966	0.2%	Rank history: #81 in FY2022, #87 in FY2023 and not on the FY2024–FY2025 lists; down 16 since FY2020.
81	RTI Laboratories Inc. Top agencies DOI (Department of the Interior) VA (Department of Veterans Affairs)	$16,425	0.2%	Rank history: #73 in FY2022 and not on the FY2023–FY2025 lists; up 28 since FY2020.
82	Keystone Laboratories, Inc. Top agencies USDA (Department of Agriculture) Army (Department of the Army)	$15,845	0.2%	Rank history: #80 in FY2022 and not on the FY2023–FY2025 lists; up 4 since FY2020.
83	Ashley M Smith Top agencies DOI (Department of the Interior)	$15,134	0.2%	Rank history: #86 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
84	Kirk Engineering & Natural Resources, Inc. Top agencies DOI (Department of the Interior)	$14,980	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
85	Janda Inc. Top agencies USDA (Department of Agriculture) DOI (Department of the Interior)	$14,560	0.2%	Rank history: not on the FY2022–FY2025 lists; up 33 since FY2020.
86	Eurofins Environment Testing Northeast, LLC Top agencies USDA (Department of Agriculture)	$12,316	0.1%	Rank history: #91 in FY2022 and not on the FY2023–FY2025 lists; up 17 since FY2020.
87	RMB Environmental Laboratories Inc. Top agencies USDA (Department of Agriculture) DOI (Department of the Interior)	$12,208	0.1%	Rank history: #38 in FY2022, #93 in FY2023 and not on the FY2024–FY2025 lists; down 11 since FY2020.
88	Enrich Products, Inc. Top agencies VA (Department of Veterans Affairs)	$12,100	0.1%	Rank history: #79 in FY2022, #80 in FY2023, #95 in FY2024 and not on the FY2025 list; up 8 since FY2020.
89	Inner Basin Environmental LLC Top agencies DOI (Department of the Interior)	$11,588	0.1%	Rank history: not on the FY2022 list, #74 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
90	H-O-H Water Technology, Inc. Top agencies DOT (Department of Transportation)	$11,520	0.1%	Rank history: not on the FY2022–FY2025 lists; down 12 since FY2020.
91	Admiralty Environmental, LLC Top agencies DOI (Department of the Interior)	$11,187	0.1%	Rank history: not on the FY2022–FY2023 lists, #77 in FY2024 and #76 in FY2025; up 38 since FY2020.
92	Global Water Technology, Inc. Top agencies DOT (Department of Transportation)	$10,950	0.1%	Rank history: #92 in FY2022 and not on the FY2023–FY2025 lists; down 12 since FY2020.
93	Matthew Davis Hack Top agencies DOI (Department of the Interior)	$10,500	0.1%	Rank history: not on the FY2022–FY2025 lists; down 59 since FY2020.
94	KIM R Albers Top agencies DOJ (Department of Justice)	$10,425	0.1%	Rank history: #94 in FY2022, not on the FY2023 list, #86 in FY2024 and not on the FY2025 list; unchanged since FY2020.
95	Environmental, Inc. Top agencies USDA (Department of Agriculture)	$9,850	0.1%	Rank history: not on the FY2022 list, #86 in FY2023 and not on the FY2024–FY2025 lists; down 4 since FY2020.
96	Jahn, Kalle L Top agencies DOI (Department of the Interior)	$9,683	0.1%	Rank history: not on the FY2022–FY2025 lists; down 22 since FY2020.
97	HAN Ping Huang & Associates, Inc. Top agencies DLA (Defense Logistics Agency)	$9,430	0.1%	Rank history: #89 in FY2022, not on the FY2023 list, #60 in FY2024 and #58 in FY2025; down 36 since FY2020.
98	Atmos Solutions Inc. Top agencies Army (Department of the Army)	$9,092	0.1%	Rank history: #66 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
99	State of California Controllers Office Through University of California, Davis Top agencies DOI (Department of the Interior)	$8,594	0.1%	Rank history: #23 in FY2022, #30 in FY2023 and not on the FY2024–FY2025 lists; down 76 since FY2020.
100	Arc Environmental, LLC Top agencies Army (Department of the Army)	$8,514	0.1%	Rank history: #97 in FY2022 and not on the FY2023–FY2025 lists; down 7 since FY2020.

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100 of 143 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 $9.61 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 B533 contractors in FY2021?

1. Aptim Federal Services LLC ($699K), 2. Camp Dresser & Mckee Inc. ($689K), 3. Premier Water & Energy Technology Inc. ($559K), 4. BNP Paribas ($556K), 5. Mabbett & Associates, Inc. ($477K), 6. Legend Technical Services of Arizona, Inc. ($346K), 7. Steris Corporation ($331K), 8. HGS Engineering Inc. ($330K), 9. Enviroscience Inc. ($255K), 10. Environmental Science Corporation ($239K).

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