Top 100 Contractors in NAICS 22131: Water Supply and Irrigation Systems, FY2023

Name: Top 100 Contractors in NAICS 22131: Water Supply and Irrigation Systems, FY2023
Creator: GovTribe

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

The top 10 won 62% of FY2023 NAICS 22131 contract dollars

Contract obligations: $565,680,556 Net of deobligations, by contracts coded NAICS 22131 or a code under it
Contractors: 628 Parent companies with an obligation
Largest contractor: American Water Works Company Inc. $172 million, 29.1% 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	American Water Works Company Inc. 10 awardees, including American Water Operations and Maintenance, LLC, American Water Military Services, LLC and Virginia-American Water Company Top agencies Army (Department of the Army) USAF (Department of the Air Force) DOJ (Department of Justice)	$172,148,259	29.1%	Rank history: #1 in FY2021, #1 in FY2022, #1 in FY2024 and #1 in FY2025; unchanged since FY2022.
2	Old North Utility Services Inc. 4 awardees, including Terrapin Utility Services, Inc., Palmetto State Utility Services, Inc. and American States Utility Services Inc. Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$53,994,402	9.1%	Rank history: #2 in FY2021, #2 in FY2022, #6 in FY2024 and not on the FY2025 list; unchanged since FY2022.
3	Oklahoma City Water Utilities Trust Top agencies USAF (Department of the Air Force)	$25,578,798	4.3%	Rank history: not on the FY2021 list, #10 in FY2022, #3 in FY2024 and #5 in FY2025; up 7 since FY2022.
4	Fort Riley Utility Services, Inc. Top agencies Army (Department of the Army)	$20,028,532	3.4%	Rank history: #5 in FY2021, #3 in FY2022, #5 in FY2024 and #11 in FY2025; down 1 since FY2022.
5	Emerald Coast Utility Services Inc. Top agencies USAF (Department of the Air Force)	$17,597,988	3.0%	Rank history: #6 in FY2021, #5 in FY2022, #7 in FY2024 and #9 in FY2025; unchanged since FY2022.
6	Fort Bliss Water Services Company Top agencies Army (Department of the Army)	$17,595,504	3.0%	Rank history: not on the FY2021 list, #14 in FY2022, #2 in FY2024 and #2 in FY2025; up 8 since FY2022.
7	Washington Suburban Sanitary Commission Top agencies HHS (Department of Health and Human Services) NASA (National Aeronautics and Space Administration) Smithsonian (Smithsonian Institution)	$16,185,174	2.7%	Rank history: #9 in FY2021, #7 in FY2022, #8 in FY2024 and #10 in FY2025; unchanged since FY2022.
8	American Water Enterprises, LLC Top agencies Army (Department of the Army)	$16,125,061	2.7%	Rank history: #3 in FY2021, #6 in FY2022, #10 in FY2024 and #12 in FY2025; down 2 since FY2022.
9	Jacobs Engineering Group Inc. 2 awardees, including Ch2M Hill Constructors, Inc. and Jacobs Project Management Co Top agencies Army (Department of the Army) VA (Department of Veterans Affairs)	$14,870,737	2.5%	Rank history: #4 in FY2021, #4 in FY2022 and not on the FY2024–FY2025 lists; down 5 since FY2022.
10	Base Utilities Inc. Top agencies USAF (Department of the Air Force)	$14,193,013	2.4%	Rank history: #7 in FY2021, #9 in FY2022, #11 in FY2024 and #14 in FY2025; down 1 since FY2022.
11	Jacobs Government Services Company Through Ch2M Hill Constructors, Inc. Top agencies Army (Department of the Army)	$13,249,589	2.2%	Rank history: not on the FY2021–FY2022 lists, #4 in FY2024 and #4 in FY2025; new.
12	Foreign Utility Consolidated Reporting Top agencies Army (Department of the Army)	$8,827,548	1.5%	Rank history: #13 in FY2021, #12 in FY2022, #12 in FY2024 and #15 in FY2025; unchanged since FY2022.
13	Augusta-Richmond County Government Top agencies Army (Department of the Army)	$8,802,885	1.5%	Rank history: #10 in FY2021, #8 in FY2022, #9 in FY2024 and #7 in FY2025; down 5 since FY2022.
14	Pural Water Specialty Co. , Inc. Top agencies Army (Department of the Army)	$7,550,909	1.3%	Rank history: #14 in FY2021, #20 in FY2022, #18 in FY2024 and #26 in FY2025; up 6 since FY2022.
15	Central Coast Water Authority Top agencies USAF (Department of the Air Force)	$7,337,104	1.2%	Rank history: #15 in FY2021, #16 in FY2022, #14 in FY2024 and #18 in FY2025; up 1 since FY2022.
16	Florida Governmental Utility Authority Top agencies USAF (Department of the Air Force)	$5,938,993	1.0%	Rank history: #8 in FY2021, #11 in FY2022, #16 in FY2024 and not on the FY2025 list; down 5 since FY2022.
17	Riverbend Water Resources District Top agencies Army (Department of the Army)	$5,907,589	1.0%	Rank history: #19 in FY2021, #15 in FY2022, #13 in FY2024 and #16 in FY2025; down 2 since FY2022.
18	GTA Containers, Inc. Top agencies Army (Department of the Army)	$4,310,997	0.7%	Rank history: not on the FY2021–FY2022 lists, #15 in FY2024 and #20 in FY2025; up 133 since FY2022.
19	Hardin County Water District NO. 1 Top agencies Army (Department of the Army)	$4,110,862	0.7%	Rank history: #17 in FY2021, #18 in FY2022, #23 in FY2024 and not on the FY2025 list; down 1 since FY2022.
20	Board of Water Commissioners of Columbus Top agencies Army (Department of the Army)	$4,053,664	0.7%	Rank history: #54 in FY2021, #79 in FY2022, #35 in FY2024 and #46 in FY2025; up 59 since FY2022.
21	Antelope Valley East Kern Water Agency Top agencies USAF (Department of the Air Force)	$3,604,240	0.6%	Rank history: #22 in FY2021, #21 in FY2022, #22 in FY2024 and #28 in FY2025; unchanged since FY2022.
22	California Water Service Group Through California Water Service Co Top agencies USAF (Department of the Air Force) Navy (Department of the Navy) DCMA (Defense Contract Management Agency)	$2,909,258	0.5%	Rank history: #24 in FY2021, #32 in FY2022, #20 in FY2024 and #29 in FY2025; up 10 since FY2022.
23	City of Jacksonville Ar Through City of Jacksonville Top agencies USAF (Department of the Air Force) DLA (Defense Logistics Agency)	$2,864,092	0.5%	Rank history: not on the FY2021 list, #33 in FY2022, #36 in FY2024 and #45 in FY2025; up 10 since FY2022.
24	City of Leavenworth Top agencies DOJ (Department of Justice)	$2,780,207	0.5%	Rank history: #91 in FY2021, #85 in FY2022, #58 in FY2024 and not on the FY2025 list; up 61 since FY2022.
25	Pyeongtaek-Si Water and Sewage Business Place Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$2,684,953	0.5%	Rank history: #16 in FY2021, #22 in FY2022, #25 in FY2024 and #22 in FY2025; down 3 since FY2022.
26	Fayetteville City of Through Fayetteville Public Works Commission Top agencies Army (Department of the Army)	$2,611,100	0.4%	Rank history: #25 in FY2021, #23 in FY2022, #26 in FY2024 and not on the FY2025 list; down 3 since FY2022.
27	FDLC Construction Management PA Top agencies USDA (Department of Agriculture)	$2,323,562	0.4%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
28	Beckley Sanitary Board Top agencies DOJ (Department of Justice)	$2,195,914	0.4%	Rank history: not on the FY2021 list, #30 in FY2022 and not on the FY2024–FY2025 lists; up 2 since FY2022.
29	Advantix Engineering Corp Top agencies USDA (Department of Agriculture)	$2,193,892	0.4%	Rank history: not on the FY2021–FY2022 lists, not on the FY2024 list and #56 in FY2025; new.
30	Northeast Ohio Regional Sewer District Top agencies NASA (National Aeronautics and Space Administration)	$2,002,584	0.3%	Rank history: #30 in FY2021, #40 in FY2022, #30 in FY2024 and #33 in FY2025; up 10 since FY2022.
31	Jungbu Water Supply Office Top agencies Army (Department of the Army)	$1,850,163	0.3%	Rank history: #27 in FY2021, #26 in FY2022, #32 in FY2024 and #34 in FY2025; down 5 since FY2022.
32	Bristol Bay Native Corporation Through SES Energy Services LLC Top agencies Army (Department of the Army)	$1,850,000	0.3%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
33	City of Wildwood City Hall Top agencies DOJ (Department of Justice)	$1,843,556	0.3%	Rank history: #28 in FY2021, #27 in FY2022, #27 in FY2024 and #24 in FY2025; down 6 since FY2022.
34	City of Fort Worth Top agencies DOJ (Department of Justice) Treasury (Department of the Treasury)	$1,825,674	0.3%	Rank history: #89 in FY2021, #41 in FY2022 and not on the FY2024–FY2025 lists; up 7 since FY2022.
35	City of Aliceville Top agencies DOJ (Department of Justice)	$1,711,075	0.3%	Rank history: #37 in FY2021, #43 in FY2022, #33 in FY2024 and #39 in FY2025; up 8 since FY2022.
36	Raleigh County Public Service District Top agencies DOJ (Department of Justice) DOL (Department of Labor)	$1,550,100	0.3%	Rank history: #33 in FY2021, #36 in FY2022 and not on the FY2024–FY2025 lists; unchanged since FY2022.
37	White Bear Construction, Inc. Top agencies DOI (Department of the Interior)	$1,443,160	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
38	Public Service Commission of Yazoo City 2 awardees Top agencies DOJ (Department of Justice)	$1,426,568	0.2%	Rank history: #35 in FY2021, #48 in FY2022, #39 in FY2024 and #50 in FY2025; up 10 since FY2022.
39	IWC Innovations LLC Top agencies GSA (General Services Administration)	$1,415,467	0.2%	Rank history: not on the FY2021–FY2022 lists, #53 in FY2024 and not on the FY2025 list; new.
40	New York City of Through New York City Water Board Top agencies DOJ (Department of Justice) Smithsonian (Smithsonian Institution) SSA (Social Security Administration)	$1,396,867	0.2%	Rank history: #49 in FY2021, #88 in FY2022 and not on the FY2024–FY2025 lists; up 48 since FY2022.
41	Tatonka Trucking Llc. Top agencies IBWC (International Boundary and Water Commission U.S.-Mexico)	$1,374,240	0.2%	Rank history: not on the FY2021–FY2022 lists, #57 in FY2024 and #97 in FY2025; new.
42	Evoqua Water Technologies LLC 3 awardees Top agencies Navy (Department of the Navy) VA (Department of Veterans Affairs) NASA (National Aeronautics and Space Administration)	$1,353,246	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
43	County of Miami-Dade Through Miami-Dade Water & Sewer Dept Top agencies DOJ (Department of Justice) Army (Department of the Army)	$1,347,408	0.2%	Rank history: #21 in FY2021, #19 in FY2022 and not on the FY2024–FY2025 lists; down 24 since FY2022.
44	The Maclean Group LLC Top agencies VA (Department of Veterans Affairs) USAF (Department of the Air Force)	$1,335,492	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; up 90 since FY2022.
45	Mccreary County Water District Top agencies DOJ (Department of Justice)	$1,327,520	0.2%	Rank history: #40 in FY2021, #44 in FY2022 and not on the FY2024–FY2025 lists; down 1 since FY2022.
46	Kyotango City Top agencies Army (Department of the Army)	$1,273,405	0.2%	Rank history: not on the FY2021 list, #42 in FY2022, #41 in FY2024 and #47 in FY2025; down 4 since FY2022.
47	City of Cocoa Top agencies NASA (National Aeronautics and Space Administration)	$1,228,892	0.2%	Rank history: #90 in FY2021, #47 in FY2022, #42 in FY2024 and #41 in FY2025; unchanged since FY2022.
48	Ch2M Hill Constructors, Inc. Top agencies Army (Department of the Army)	$1,186,307	0.2%	Rank history: #75 in FY2021, #13 in FY2022 and not on the FY2024–FY2025 lists; down 35 since FY2022.
49	Sheridan City of Through City of Sheridan Top agencies DOJ (Department of Justice)	$1,169,300	0.2%	Rank history: #55 in FY2021, #45 in FY2022 and not on the FY2024–FY2025 lists; down 4 since FY2022.
50	Edgefield County Water & Sewer Authority Top agencies DOJ (Department of Justice)	$1,127,918	0.2%	Rank history: #50 in FY2021, #49 in FY2022 and not on the FY2024–FY2025 lists; down 1 since FY2022.
51	Clear Lake City Water Authority Top agencies NASA (National Aeronautics and Space Administration)	$1,119,519	0.2%	Rank history: #52 in FY2021, #74 in FY2022, #24 in FY2024 and #53 in FY2025; up 23 since FY2022.
52	City of Welch Top agencies DOJ (Department of Justice)	$1,103,356	0.2%	Rank history: #48 in FY2021, #53 in FY2022, #40 in FY2024 and #54 in FY2025; up 1 since FY2022.
53	LOS Angeles City of Through LOS Angeles Department of Water & Power Top agencies DOJ (Department of Justice) VA (Department of Veterans Affairs)	$1,065,290	0.2%	Rank history: not on the FY2021 list, #29 in FY2022 and not on the FY2024–FY2025 lists; down 24 since FY2022.
54	Autoridad DE Acueductos Y Alcantarillados DE PR Top agencies DOJ (Department of Justice)	$1,011,246	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; up 81 since FY2022.
55	City of Greenville Top agencies DOJ (Department of Justice)	$1,010,758	0.2%	Rank history: #51 in FY2021, #64 in FY2022, #46 in FY2024 and #76 in FY2025; up 9 since FY2022.
56	Town of Pollock Top agencies DOJ (Department of Justice)	$1,005,130	0.2%	Rank history: #32 in FY2021, #39 in FY2022 and not on the FY2024–FY2025 lists; down 17 since FY2022.
57	Texarkana Water Utilities Top agencies DOJ (Department of Justice)	$976,338	0.2%	Rank history: not on the FY2021 list, #76 in FY2022 and not on the FY2024–FY2025 lists; up 19 since FY2022.
58	City of Victorville Top agencies DOJ (Department of Justice)	$946,932	0.2%	Rank history: #83 in FY2021, #50 in FY2022 and not on the FY2024–FY2025 lists; down 8 since FY2022.
59	City of Forrest City Top agencies DOJ (Department of Justice)	$946,205	0.2%	Rank history: not on the FY2021–FY2022 lists, #51 in FY2024 and not on the FY2025 list; new.
60	Preston County Public Service District NO4 Top agencies DOJ (Department of Justice)	$932,113	0.2%	Rank history: #47 in FY2021, #52 in FY2022, #44 in FY2024 and #51 in FY2025; down 8 since FY2022.
61	City of Danbury CT Top agencies DOJ (Department of Justice)	$890,000	0.2%	Rank history: #39 in FY2021, #59 in FY2022, #50 in FY2024 and #63 in FY2025; down 2 since FY2022.
62	City of Prestonsburg Through Prestonsburg City Utilities Commission Top agencies DOJ (Department of Justice)	$851,571	0.1%	Rank history: #73 in FY2021, #71 in FY2022, #78 in FY2024 and not on the FY2025 list; up 9 since FY2022.
63	Herlong Public Utility District Top agencies DOJ (Department of Justice) Army (Department of the Army)	$818,929	0.1%	Rank history: not on the FY2021 list, #60 in FY2022, #89 in FY2024 and not on the FY2025 list; down 3 since FY2022.
64	Clean Harbors Inc Through Clean Harbors Environmental Services Inc. Top agencies Navy (Department of the Navy) Army (Department of the Army)	$795,222	0.1%	Rank history: not on the FY2021 list, #28 in FY2022 and not on the FY2024–FY2025 lists; down 36 since FY2022.
65	Schuylkill County Municipal Authority Top agencies DOJ (Department of Justice)	$774,466	0.1%	Rank history: #68 in FY2021, #69 in FY2022 and not on the FY2024–FY2025 lists; up 4 since FY2022.
66	Utility Systems of Georgia, Inc. Top agencies Army (Department of the Army)	$769,286	0.1%	Rank history: #60 in FY2021, #75 in FY2022, #48 in FY2024 and #57 in FY2025; up 9 since FY2022.
67	City of Beaumont Top agencies DOJ (Department of Justice)	$757,022	0.1%	Rank history: not on the FY2021 list, #38 in FY2022 and not on the FY2024–FY2025 lists; down 29 since FY2022.
68	City of El Reno Top agencies DOJ (Department of Justice)	$756,502	0.1%	Rank history: #62 in FY2021, #62 in FY2022, #47 in FY2024 and #60 in FY2025; down 6 since FY2022.
69	Columbiana County Top agencies DOJ (Department of Justice)	$753,892	0.1%	Rank history: #36 in FY2021, not on the FY2022 list, #49 in FY2024 and #58 in FY2025; up 412 since FY2022.
70	Gyrene Engineering Management, LLC Top agencies USAF (Department of the Air Force)	$701,252	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
71	DC Water & Sewer Authority Top agencies Smithsonian (Smithsonian Institution) CFPB (Consumer Financial Protection Bureau) Treasury (Department of the Treasury)	$685,851	0.1%	Rank history: #64 in FY2021, #46 in FY2022, #94 in FY2024 and not on the FY2025 list; down 25 since FY2022.
72	Ocs-Ncs JV, LLC Top agencies DOI (Department of the Interior)	$681,060	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
73	Town of Alderson Top agencies DOJ (Department of Justice)	$677,747	0.1%	Rank history: #72 in FY2021, #78 in FY2022, #52 in FY2024 and #61 in FY2025; up 5 since FY2022.
74	Williamsburg County Development Corp Through Williamsburg County Water & Sewer Top agencies DOJ (Department of Justice)	$672,782	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
75	Water Treatment Specialists Inc. Top agencies VA (Department of Veterans Affairs)	$667,965	0.1%	Rank history: not on the FY2021–FY2022 lists, not on the FY2024 list and #99 in FY2025; up 42 since FY2022.
76	Woodway Water Authority Top agencies DOJ (Department of Justice)	$667,018	0.1%	Rank history: #65 in FY2021, #87 in FY2022, #54 in FY2024 and #65 in FY2025; up 11 since FY2022.
77	Gilmer County Public Service District Top agencies DOJ (Department of Justice)	$635,530	0.1%	Rank history: #41 in FY2021, #51 in FY2022 and not on the FY2024–FY2025 lists; down 26 since FY2022.
78	City of Big Spring Top agencies DOJ (Department of Justice)	$634,481	0.1%	Rank history: #81 in FY2021, not on the FY2022 list, #75 in FY2024 and not on the FY2025 list; up 25 since FY2022.
79	Water Authority Busan Metropolitan City Korea 6 awardees, including Daegu Metropolitan City, Headquarters, Daegu Waterworks and Headquarters of Pohang Waterworks Top agencies Army (Department of the Army)	$617,315	0.1%	Rank history: #82 in FY2021, #82 in FY2022, #61 in FY2024 and not on the FY2025 list; up 3 since FY2022.
80	City of Oakdale Top agencies DOJ (Department of Justice)	$612,481	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; up 96 since FY2022.
81	Coolco LLC Top agencies GSA (General Services Administration)	$602,726	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
82	Eagle Harbor, LLC Top agencies Army (Department of the Army)	$598,109	0.1%	Rank history: #77 in FY2021, #81 in FY2022, #62 in FY2024 and not on the FY2025 list; down 1 since FY2022.
83	Natives of Kodiak, Incorporated Through Koman Government Solutions LLC Top agencies Army (Department of the Army)	$589,011	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
84	Construction Solutions Group, LLC Top agencies DOI (Department of the Interior)	$581,000	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
85	City of Jesup Top agencies DOJ (Department of Justice)	$569,291	0.1%	Rank history: #46 in FY2021, #63 in FY2022 and not on the FY2024–FY2025 lists; down 22 since FY2022.
86	City of Newport News Top agencies NASA (National Aeronautics and Space Administration)	$565,913	0.1%	Rank history: #94 in FY2021, not on the FY2022 list, #60 in FY2024 and not on the FY2025 list; up 15 since FY2022.
87	Fluid Solutions LLC Top agencies DOS (Department of State)	$562,717	0.1%	Rank history: #98 in FY2021, not on the FY2022 list, #64 in FY2024 and #55 in FY2025; up 22 since FY2022.
88	Liquitech, Inc. Top agencies VA (Department of Veterans Affairs)	$558,918	0.1%	Rank history: not on the FY2021 list, #65 in FY2022, #86 in FY2024 and #71 in FY2025; down 23 since FY2022.
89	Forte Insurance (Cambodia) PLC Top agencies DOS (Department of State)	$553,132	0.1%	Rank history: #66 in FY2021, #84 in FY2022, #43 in FY2024 and #49 in FY2025; down 5 since FY2022.
90	Lakehurst Water & Sanitation District Top agencies DOJ (Department of Justice)	$543,556	0.1%	Rank history: #88 in FY2021, #94 in FY2022 and not on the FY2024–FY2025 lists; up 4 since FY2022.
91	State of Hawaii 3 awardees, including Agribusiness Development Corporation Top agencies Navy (Department of the Navy)	$514,660	0.1%	Rank history: #43 in FY2021, #57 in FY2022, #72 in FY2024 and not on the FY2025 list; down 34 since FY2022.
92	Green and Sustainable Services, LLC Top agencies USAF (Department of the Air Force) VA (Department of Veterans Affairs)	$514,489	0.1%	Rank history: not on the FY2021 list, #83 in FY2022, #68 in FY2024 and #77 in FY2025; down 9 since FY2022.
93	Allegany County Commissioners Top agencies DOJ (Department of Justice)	$504,764	0.1%	Rank history: #95 in FY2021, #80 in FY2022, #71 in FY2024 and #96 in FY2025; down 13 since FY2022.
94	Everson Construction Group, LLC Top agencies DHS (Department of Homeland Security)	$476,250	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
95	Oregon State of Through Department of Water Resources Oregon Top agencies DOI (Department of the Interior)	$469,002	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
96	County of Brunswick Top agencies Army (Department of the Army)	$455,795	0.1%	Rank history: not on the FY2021–FY2022 lists, #96 in FY2024 and not on the FY2025 list; up 99 since FY2022.
97	City of Atlanta Top agencies DOJ (Department of Justice)	$431,765	0.1%	Rank history: #20 in FY2021, #25 in FY2022 and not on the FY2024–FY2025 lists; down 72 since FY2022.
98	Sungro Products LLC Top agencies HHS (Department of Health and Human Services)	$429,044	0.1%	Rank history: #56 in FY2021, not on the FY2022 list and not on the FY2024–FY2025 lists; up 75 since FY2022.
99	Ama Diversified Construction Group Top agencies Army (Department of the Army)	$420,814	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; up 62 since FY2022.
100	Essential Utilities, Inc. Top agencies DOJ (Department of Justice)	$411,894	0.1%	Rank history: #99 in FY2021, not on the FY2022 list, #81 in FY2024 and #80 in FY2025; up 16 since FY2022.

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100 of 628 contractors listed here. See the rest on GovTribe.

Rankings for the codes under NAICS 22131

Code	Net obligations	Largest contractor
221310 Water Supply and Irrigation Systems	$565,680,556	American Water Works Company Inc.

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 $592 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 22131 contractors in FY2023?

1. American Water Works Company Inc. ($172M), 2. Old North Utility Services Inc. ($54M), 3. Oklahoma City Water Utilities Trust ($25.6M), 4. Fort Riley Utility Services, Inc. ($20M), 5. Emerald Coast Utility Services Inc. ($17.6M), 6. Fort Bliss Water Services Company ($17.6M), 7. Washington Suburban Sanitary Commission ($16.2M), 8. American Water Enterprises, LLC ($16.1M), 9. Jacobs Engineering Group Inc. ($14.9M), 10. Base Utilities Inc. ($14.2M).

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