Top 100 Contractors in NAICS 221320: Sewage Treatment Facilities, FY2023

Name: Top 100 Contractors in NAICS 221320: Sewage Treatment Facilities, FY2023
Creator: GovTribe

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

The top 10 won 67% of FY2023 NAICS 221320 contract dollars

Contract obligations: $187,343,518 Net of deobligations, by contracts coded NAICS 221320
Contractors: 193 Parent companies with an obligation
Largest contractor: Aqua Engineers Inc. $28.4 million, 14.8% 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	Aqua Engineers Inc. Top agencies Army (Department of the Army)	$28,424,519	14.8%	Rank history: #1 in FY2021, #2 in FY2022, #2 in FY2024 and #2 in FY2025; up 1 since FY2022.
2	Veolia Water North America-West LLC Through Veolia Water West Operating Services Inc. Top agencies IBWC (International Boundary and Water Commission U.S.-Mexico)	$22,980,246	12.0%	Rank history: #2 in FY2021, #5 in FY2022, #12 in FY2024 and not on the FY2025 list; up 3 since FY2022.
3	American Water Works Company Inc. 2 awardees, including American Water Military Services, LLC and Illinois-American Water Company Top agencies Army (Department of the Army) Navy (Department of the Navy) DOJ (Department of Justice)	$21,616,425	11.3%	Rank history: #3 in FY2021, #1 in FY2022, #1 in FY2024 and #3 in FY2025; down 2 since FY2022.
4	Old North Utility Services Inc. 2 awardees, including Old Dominion Utility Services, Inc. and American States Utility Services Inc. Top agencies Army (Department of the Army) USAF (Department of the Air Force) Navy (Department of the Navy)	$12,976,748	6.8%	Rank history: #6 in FY2021, #3 in FY2022, #8 in FY2024 and not on the FY2025 list; down 1 since FY2022.
5	Foreign Utility Consolidated Reporting Top agencies Army (Department of the Army)	$12,535,934	6.5%	Rank history: #4 in FY2021, #4 in FY2022, #6 in FY2024 and #6 in FY2025; down 1 since FY2022.
6	Nikken Sogyo Co., Ltd. Top agencies Navy (Department of the Navy)	$10,258,432	5.4%	Rank history: #5 in FY2021, #7 in FY2022, #7 in FY2024 and #7 in FY2025; up 1 since FY2022.
7	City of Aberdeen Top agencies Army (Department of the Army)	$6,030,552	3.1%	Rank history: #7 in FY2021, #8 in FY2022, #5 in FY2024 and #10 in FY2025; up 1 since FY2022.
8	Tama City Hall Top agencies USAF (Department of the Air Force)	$4,532,169	2.4%	Rank history: not on the FY2021 list, #6 in FY2022, #10 in FY2024 and #11 in FY2025; down 2 since FY2022.
9	Perc Water Corporation Top agencies Navy (Department of the Navy) USAF (Department of the Air Force) DHS (Department of Homeland Security)	$4,422,333	2.3%	Rank history: #9 in FY2021, #9 in FY2022, #9 in FY2024 and #9 in FY2025; unchanged since FY2022.
10	Nikken-Metawater JV Top agencies Navy (Department of the Navy)	$3,951,145	2.1%	Rank history: not on the FY2021–FY2022 lists, #14 in FY2024 and #13 in FY2025; new.
11	South Granville Water & Sewer Auth Top agencies DOJ (Department of Justice)	$3,845,184	2.0%	Rank history: #11 in FY2021, #11 in FY2022, #13 in FY2024 and #12 in FY2025; unchanged since FY2022.
12	Optech-Monette, LLC Top agencies USAF (Department of the Air Force)	$3,345,400	1.7%	Rank history: #14 in FY2021, #13 in FY2022, #15 in FY2024 and #18 in FY2025; up 1 since FY2022.
13	Municipality of Anchorage Top agencies USAF (Department of the Air Force)	$2,735,573	1.4%	Rank history: #18 in FY2021, #12 in FY2022, #16 in FY2024 and #15 in FY2025; down 1 since FY2022.
14	Harnett, County of North Carolina Top agencies Army (Department of the Army)	$2,682,347	1.4%	Rank history: #13 in FY2021, #20 in FY2022, #17 in FY2024 and #17 in FY2025; up 6 since FY2022.
15	Krätz GMBH Top agencies Army (Department of the Army)	$2,611,076	1.4%	Rank history: #21 in FY2021, #14 in FY2022 and not on the FY2024–FY2025 lists; down 1 since FY2022.
16	Fairbanks Sewer & Water, Inc. Through Golden Heart Utilities, Inc. Top agencies Army (Department of the Army)	$2,335,000	1.2%	Rank history: #20 in FY2021, #16 in FY2022, #18 in FY2024 and #49 in FY2025; unchanged since FY2022.
17	Sanitation Dist 4 Inc. Top agencies DOJ (Department of Justice)	$2,136,492	1.1%	Rank history: #34 in FY2021, #23 in FY2022 and not on the FY2024–FY2025 lists; up 6 since FY2022.
18	Schwarz Construction LLC Top agencies Army (Department of the Army)	$1,822,320	1.0%	Rank history: not on the FY2021–FY2022 lists, #19 in FY2024 and #21 in FY2025; new.
19	San Antonio River Authority Top agencies USAF (Department of the Air Force)	$1,553,596	0.8%	Rank history: #26 in FY2021, #25 in FY2022, #37 in FY2024 and #33 in FY2025; up 6 since FY2022.
20	DCS Infrastructure, LLC Top agencies VA (Department of Veterans Affairs)	$1,477,058	0.8%	Rank history: #19 in FY2021, #18 in FY2022, #20 in FY2024 and #28 in FY2025; down 2 since FY2022.
21	Autoridad DE Acueductos Y Alcantarillados DE PR Top agencies DOJ (Department of Justice)	$1,409,185	0.7%	Rank history: #10 in FY2021, #34 in FY2022 and not on the FY2024–FY2025 lists; up 13 since FY2022.
22	City of Milan Top agencies DOJ (Department of Justice)	$1,325,924	0.7%	Rank history: #22 in FY2021, #24 in FY2022 and not on the FY2024–FY2025 lists; up 2 since FY2022.
23	Village of Saranac Lake Top agencies DOJ (Department of Justice)	$1,113,146	0.6%	Rank history: #31 in FY2021, #26 in FY2022, #27 in FY2024 and #26 in FY2025; up 3 since FY2022.
24	Gregg Township Municipal Authority Top agencies DOJ (Department of Justice)	$1,089,929	0.6%	Rank history: #30 in FY2021, #33 in FY2022, #24 in FY2024 and #27 in FY2025; up 9 since FY2022.
25	Wastewater Depot, LLC Top agencies Army (Department of the Army)	$1,036,845	0.5%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
26	City of Talladega Top agencies DOJ (Department of Justice)	$1,012,302	0.5%	Rank history: #76 in FY2021, #31 in FY2022 and not on the FY2024–FY2025 lists; up 5 since FY2022.
27	Lee County VA Through County of Lee Top agencies DOJ (Department of Justice)	$1,001,904	0.5%	Rank history: #33 in FY2021, #37 in FY2022, #25 in FY2024 and not on the FY2025 list; up 10 since FY2022.
28	City of Hopewell Through City of Hopewell Hrwtf Top agencies DOJ (Department of Justice)	$932,454	0.5%	Rank history: #12 in FY2021, #17 in FY2022, #44 in FY2024 and not on the FY2025 list; down 11 since FY2022.
29	City of Atwater Top agencies DOJ (Department of Justice)	$910,936	0.5%	Rank history: #29 in FY2021, #29 in FY2022 and not on the FY2024–FY2025 lists; unchanged since FY2022.
30	Veolia Federal Utility Services USA LLC Top agencies USAF (Department of the Air Force)	$884,930	0.5%	Rank history: not on the FY2021 list, #35 in FY2022 and not on the FY2024–FY2025 lists; up 5 since FY2022.
31	Project Solutions, Inc. Top agencies USAF (Department of the Air Force) USDA (Department of Agriculture)	$881,336	0.5%	Rank history: #52 in FY2021, #43 in FY2022, #29 in FY2024 and #34 in FY2025; up 12 since FY2022.
32	City of Leavenworth KS Top agencies Army (Department of the Army) DOJ (Department of Justice)	$860,445	0.4%	Rank history: #35 in FY2021, #28 in FY2022, #28 in FY2024 and #25 in FY2025; down 4 since FY2022.
33	Town of North Hempstead Town Hall Through Town of North Hempstead Top agencies DOT (Department of Transportation)	$860,191	0.4%	Rank history: #38 in FY2021, #38 in FY2022, #26 in FY2024 and not on the FY2025 list; up 5 since FY2022.
34	Johnson County of Through Paintsville Utilities Commission Top agencies DOJ (Department of Justice)	$839,593	0.4%	Rank history: #45 in FY2021, #41 in FY2022, #55 in FY2024 and not on the FY2025 list; up 7 since FY2022.
35	Manguiri Contracting LLC Top agencies Army (Department of the Army)	$770,022	0.4%	Rank history: not on the FY2021–FY2022 lists, #81 in FY2024 and not on the FY2025 list; new.
36	Lafayette Township Top agencies DOJ (Department of Justice)	$726,696	0.4%	Rank history: #54 in FY2021, #40 in FY2022, #34 in FY2024 and #32 in FY2025; up 4 since FY2022.
37	Optimum Environmental Corporation Top agencies USDA (Department of Agriculture)	$675,012	0.4%	Rank history: #50 in FY2021, #53 in FY2022, #30 in FY2024 and #19 in FY2025; up 16 since FY2022.
38	City of Atlanta Top agencies DOJ (Department of Justice)	$668,484	0.3%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
39	Lab Leasing Co., Inc. Top agencies USDA (Department of Agriculture)	$648,000	0.3%	Rank history: not on the FY2021–FY2022 lists, #32 in FY2024 and #59 in FY2025; new.
40	City of Pekin Top agencies DOJ (Department of Justice)	$595,825	0.3%	Rank history: #42 in FY2021, #42 in FY2022, #41 in FY2024 and #30 in FY2025; up 2 since FY2022.
41	K.i. Kogyo Ltd. Top agencies Navy (Department of the Navy) DLA (Defense Logistics Agency)	$583,309	0.3%	Rank history: not on the FY2021–FY2022 lists, not on the FY2024 list and #61 in FY2025; new.
42	West Kern Water District Top agencies DOJ (Department of Justice)	$554,513	0.3%	Rank history: not on the FY2021 list, #44 in FY2022 and not on the FY2024–FY2025 lists; up 2 since FY2022.
43	Lexington-Fayette Urban County Government Top agencies DOJ (Department of Justice)	$493,512	0.3%	Rank history: #56 in FY2021, #47 in FY2022 and not on the FY2024–FY2025 lists; up 4 since FY2022.
44	Camp Dresser & Mckee Inc. Through CDM Constructors Inc. Top agencies Navy (Department of the Navy)	$473,500	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
45	Lowndes County Board of Commissioners Top agencies USAF (Department of the Air Force)	$471,141	0.2%	Rank history: #59 in FY2021, #54 in FY2022, #21 in FY2024 and #29 in FY2025; up 9 since FY2022.
46	Waymart Area Authority Top agencies DOJ (Department of Justice)	$457,341	0.2%	Rank history: #51 in FY2021, #48 in FY2022 and not on the FY2024–FY2025 lists; up 2 since FY2022.
47	Kent County Government Top agencies USAF (Department of the Air Force)	$444,088	0.2%	Rank history: #57 in FY2021, #51 in FY2022, #40 in FY2024 and #37 in FY2025; up 4 since FY2022.
48	Texas Water Utilities, L.P. Top agencies DOJ (Department of Justice)	$420,459	0.2%	Rank history: #27 in FY2021, #27 in FY2022, not on the FY2024 list and #42 in FY2025; down 21 since FY2022.
49	Dublin San Ramon Services District Top agencies DOJ (Department of Justice)	$408,068	0.2%	Rank history: #25 in FY2021, #30 in FY2022 and not on the FY2024–FY2025 lists; down 19 since FY2022.
50	Schwarz Construction Llc-K Hayes Limited Joint Venture Top agencies Army (Department of the Army)	$398,000	0.2%	Rank history: #53 in FY2021, #32 in FY2022 and not on the FY2024–FY2025 lists; down 18 since FY2022.
51	Columbia Land Services Inc. Top agencies DOI (Department of the Interior)	$396,057	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
52	City of Berlin Top agencies DOJ (Department of Justice)	$391,481	0.2%	Rank history: #67 in FY2021, #57 in FY2022 and not on the FY2024–FY2025 lists; up 5 since FY2022.
53	Kaihou Kogyo Co., Ltd. Top agencies USAF (Department of the Air Force)	$384,921	0.2%	Rank history: #73 in FY2021, #66 in FY2022, #58 in FY2024 and #62 in FY2025; up 13 since FY2022.
54	Singh Operational Services, Inc. Top agencies USDA (Department of Agriculture) Smithsonian (Smithsonian Institution)	$379,910	0.2%	Rank history: #65 in FY2021, #77 in FY2022 and not on the FY2024–FY2025 lists; up 23 since FY2022.
55	Sociedade DE Empreitadas E Trabalhos Hidraulicos S.a. Top agencies USAF (Department of the Air Force)	$358,344	0.2%	Rank history: #68 in FY2021, #59 in FY2022 and not on the FY2024–FY2025 lists; up 4 since FY2022.
56	Bluwater Services, LLC Top agencies USAF (Department of the Air Force)	$324,800	0.2%	Rank history: #69 in FY2021, #60 in FY2022 and not on the FY2024–FY2025 lists; up 4 since FY2022.
57	A. James Global Services, Inc. Top agencies USAF (Department of the Air Force)	$322,149	0.2%	Rank history: not on the FY2021 list, #69 in FY2022, #46 in FY2024 and #52 in FY2025; up 12 since FY2022.
58	City of Oklahoma City Top agencies DOJ (Department of Justice)	$307,698	0.2%	Rank history: #72 in FY2021, #65 in FY2022 and not on the FY2024–FY2025 lists; up 7 since FY2022.
59	Pacific Northwest Environmental Services LLC Top agencies USDA (Department of Agriculture)	$287,004	0.1%	Rank history: #74 in FY2021, #72 in FY2022, #50 in FY2024 and #53 in FY2025; up 13 since FY2022.
60	City of Manchester Top agencies DOJ (Department of Justice)	$283,728	0.1%	Rank history: not on the FY2021 list, #55 in FY2022, #47 in FY2024 and #58 in FY2025; down 5 since FY2022.
61	Nsp-Bch, LLC Top agencies USAF (Department of the Air Force)	$271,108	0.1%	Rank history: not on the FY2021–FY2022 lists, #51 in FY2024 and #47 in FY2025; new.
62	Midway Sewer District Top agencies DOJ (Department of Justice)	$269,176	0.1%	Rank history: #85 in FY2021, not on the FY2022 list, #59 in FY2024 and not on the FY2025 list; up 70 since FY2022.
63	Glenville Utility Top agencies DOJ (Department of Justice)	$268,383	0.1%	Rank history: #55 in FY2021, #46 in FY2022 and not on the FY2024–FY2025 lists; down 17 since FY2022.
64	Gotemba Eiseisha, Co. Ltd. Top agencies Navy (Department of the Navy)	$252,644	0.1%	Rank history: #71 in FY2021, #63 in FY2022, #56 in FY2024 and #57 in FY2025; down 1 since FY2022.
65	City of Seagoville Top agencies DOJ (Department of Justice)	$233,044	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
66	Kankyo Gijutsu KK Top agencies USAF (Department of the Air Force)	$231,009	0.1%	Rank history: #79 in FY2021, #71 in FY2022, #62 in FY2024 and #63 in FY2025; up 5 since FY2022.
67	City of Victorville Top agencies DOJ (Department of Justice)	$229,219	0.1%	Rank history: #24 in FY2021, #21 in FY2022 and not on the FY2024–FY2025 lists; down 46 since FY2022.
68	Massachusetts Development Finance Agency Top agencies DOJ (Department of Justice)	$224,942	0.1%	Rank history: #78 in FY2021, #70 in FY2022 and not on the FY2024–FY2025 lists; up 2 since FY2022.
69	Kabul Cummins Technical Servic Es Company Top agencies DOS (Department of State)	$224,635	0.1%	Rank history: #63 in FY2021, not on the FY2022 list and not on the FY2024–FY2025 lists; returned.
70	New York City of Through New York City Water Board Top agencies DOJ (Department of Justice)	$224,298	0.1%	Rank history: #16 in FY2021, #15 in FY2022 and not on the FY2024–FY2025 lists; down 55 since FY2022.
71	Advanced Logistic Partners Inc. Top agencies Army (Department of the Army)	$223,605	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
72	City of Alexandria Virginia Sanitation Authority Top agencies WHS (DOD Washington Headquarters Service)	$218,760	0.1%	Rank history: #75 in FY2021, not on the FY2022 list, #80 in FY2024 and #56 in FY2025; returned.
73	Kelly Township Municipal Authority Top agencies DOJ (Department of Justice)	$217,209	0.1%	Rank history: #66 in FY2021, #61 in FY2022 and not on the FY2024–FY2025 lists; down 12 since FY2022.
74	Preston County Public Service District Top agencies DOJ (Department of Justice)	$202,348	0.1%	Rank history: #58 in FY2021, #49 in FY2022, #36 in FY2024 and #41 in FY2025; down 25 since FY2022.
75	Herlong Public Utility District Top agencies DOJ (Department of Justice)	$189,750	0.1%	Rank history: #41 in FY2021, not on the FY2022 list, #38 in FY2024 and #31 in FY2025; returned.
76	Denver Board of Water Commissioners Top agencies Treasury (Department of the Treasury)	$166,409	0.1%	Rank history: not on the FY2021 list, #78 in FY2022, #60 in FY2024 and #78 in FY2025; up 2 since FY2022.
77	Urban Construction Bureau Sagamihara City Top agencies Army (Department of the Army)	$166,282	0.1%	Rank history: not on the FY2021 list, #76 in FY2022, #65 in FY2024 and #65 in FY2025; down 1 since FY2022.
78	Oglala Sioux Tribe of Pine Ridge Indian Reservation Top agencies DOI (Department of the Interior)	$160,000	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
79	City of Watervliet Top agencies Army (Department of the Army)	$156,800	0.1%	Rank history: not on the FY2021 list, #62 in FY2022 and not on the FY2024–FY2025 lists; down 17 since FY2022.
80	Cumberland County Utilities Authority Top agencies DOJ (Department of Justice)	$151,695	0.1%	Rank history: #64 in FY2021, #56 in FY2022 and not on the FY2024–FY2025 lists; down 24 since FY2022.
81	City of Waseca Top agencies DOJ (Department of Justice)	$148,040	0.1%	Rank history: #77 in FY2021, #68 in FY2022 and not on the FY2024–FY2025 lists; down 13 since FY2022.
82	Smith & Loveless, Inc. Top agencies USDA (Department of Agriculture)	$139,998	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
83	GP Jager, LLC Top agencies DOJ (Department of Justice)	$136,987	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
84	Nicklaus Engineering, Inc. Top agencies Army (Department of the Army)	$136,563	0.1%	Rank history: #62 in FY2021, #67 in FY2022, #52 in FY2024 and #70 in FY2025; down 17 since FY2022.
85	Rockaway Valley Reg Sewer Auth Top agencies Army (Department of the Army)	$134,467	0.1%	Rank history: #84 in FY2021, #84 in FY2022, #61 in FY2024 and #69 in FY2025; down 1 since FY2022.
86	City of Richmond Top agencies SSA (Social Security Administration)	$133,856	0.1%	Rank history: #90 in FY2021, #85 in FY2022, #64 in FY2024 and #79 in FY2025; down 1 since FY2022.
87	City of Sandstone Top agencies DOJ (Department of Justice)	$122,192	0.1%	Rank history: not on the FY2021 list, #91 in FY2022 and not on the FY2024–FY2025 lists; up 4 since FY2022.
88	International Chemstar Incorporated Top agencies Navy (Department of the Navy)	$116,464	0.1%	Rank history: #49 in FY2021, #58 in FY2022 and not on the FY2024–FY2025 lists; down 30 since FY2022.
89	Schrass GMBH Top agencies USAF (Department of the Air Force)	$114,031	0.1%	Rank history: #81 in FY2021, #79 in FY2022, #78 in FY2024 and #75 in FY2025; down 10 since FY2022.
90	Nabd Alasr Trading and Contracting Company Top agencies DOS (Department of State)	$112,087	0.1%	Rank history: not on the FY2021–FY2022 lists, #72 in FY2024 and not on the FY2025 list; new.
91	Stat Waste Stream Services Inc. Top agencies DHS (Department of Homeland Security)	$109,150	0.1%	Rank history: not on the FY2021–FY2022 lists, #63 in FY2024 and not on the FY2025 list; up 73 since FY2022.
92	City of Anadarko City Hall Top agencies DOI (Department of the Interior)	$106,549	0.1%	Rank history: not on the FY2021 list, #87 in FY2022, #42 in FY2024 and #55 in FY2025; down 5 since FY2022.
93	Schwandorfer Umwelttechnik GMBH Top agencies Army (Department of the Army)	$99,430	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
94	Bristol Bay Borough Of Top agencies USAF (Department of the Air Force)	$95,000	<0.1%	Rank history: #98 in FY2021, #93 in FY2022, #76 in FY2024 and #74 in FY2025; down 1 since FY2022.
95	South Park Township Top agencies HHS (Department of Health and Human Services) DOE (Department of Energy)	$95,000	<0.1%	Rank history: #99 in FY2021, not on the FY2022 list, #87 in FY2024 and not on the FY2025 list; up 6 since FY2022.
96	Gwendolyn C. Hill Top agencies Army (Department of the Army)	$92,460	<0.1%	Rank history: not on the FY2021 list, #94 in FY2022, #79 in FY2024 and #73 in FY2025; down 2 since FY2022.
97	DOO Beotok Pancevo Top agencies DOS (Department of State)	$82,737	<0.1%	Rank history: #97 in FY2021, #97 in FY2022, #82 in FY2024 and not on the FY2025 list; unchanged since FY2022.
98	Chesapeake Laboratories Inc. Top agencies DOI (Department of the Interior)	$82,200	<0.1%	Rank history: not on the FY2021 list, #98 in FY2022 and not on the FY2024–FY2025 lists; unchanged since FY2022.
99	M Davidson & Associates Inc. Top agencies Army (Department of the Army)	$79,000	<0.1%	Rank history: not on the FY2021–FY2022 lists, #77 in FY2024 and #72 in FY2025; up 5 since FY2022.
100	Suez WTS USA Inc. Through Suez RV Ile-De-France Top agencies DOS (Department of State)	$78,841	<0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.

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100 of 193 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 $192 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 221320 contractors in FY2023?

1. Aqua Engineers Inc. ($28.4M), 2. Veolia Water North America-West LLC ($23M), 3. American Water Works Company Inc. ($21.6M), 4. Old North Utility Services Inc. ($13M), 5. Foreign Utility Consolidated Reporting ($12.5M), 6. Nikken Sogyo Co., Ltd. ($10.3M), 7. City of Aberdeen ($6.03M), 8. Tama City Hall ($4.53M), 9. Perc Water Corporation ($4.42M), 10. Nikken-Metawater JV ($3.95M).

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