Top 100 Contractors in NAICS 22131: Water Supply and Irrigation Systems, Aug 2025–Jul 2026

Name: Top 100 Contractors in NAICS 22131: Water Supply and Irrigation Systems, Aug 2025–Jul 2026
Creator: GovTribe
License: https://creativecommons.org/licenses/by/4.0/

Parent companies by net contract obligations Aug 1, 2025 – Jul 31, 2026 Code page on GovTribe

The latest 12 months. See the newest fiscal year's list: Top Contractors in NAICS 22131: Water Supply and Irrigation Systems, FY2025.

The top 10 won 75% of NAICS 22131 contract dollars from August 2025 through July 2026

Contract obligations: $651,626,558 Net of deobligations, by contracts coded NAICS 22131 or a code under it
Contractors: 518 Parent companies with an obligation
Largest contractor: American Water Works Company Inc. $210 million, 31.4% of obligations
Data as of: Nov 5, 2026

Contract actions from FPDS (SAM.gov). How the rankings work · Download all 100 rows as CSV · Free to reuse with credit to GovTribe (CC BY 4.0)

Full ranking

Rank	Contractor	Net obligations	Share	Trend
1	American Water Works Company Inc. 3 awardees, including American Water Operations and Maintenance, LLC, American Water Military Services, LLC and Kentucky-American Water Company Top agencies Army (Department of the Army) USAF (Department of the Air Force) DOJ (Department of Justice)	$209,861,105	31.4%	Rank history: #1 in FY2021, #1 in FY2022, #1 in FY2023, #1 in FY2024 and #1 in FY2025; unchanged since Aug 2024–Jul 2025.
2	American States Water Company 7 awardees, including Old North Utility Services, Inc., Emerald Coast Utility Services Inc. and Fort Bliss Water Services Company Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$119,981,146	17.9%	Rank history: not on the FY2021 list, #14 in FY2022, #6 in FY2023, #2 in FY2024 and #2 in FY2025; unchanged since Aug 2024–Jul 2025.
3	Jacobs Engineering Group Inc. 2 awardees, including Ch2M Hill Constructors, Inc. Top agencies Army (Department of the Army)	$42,998,198	6.4%	Rank history: not on the FY2021–FY2022 lists, #11 in FY2023, #4 in FY2024 and #4 in FY2025; up 2 since Aug 2024–Jul 2025.
4	Oklahoma City Water Utilities Trust Top agencies USAF (Department of the Air Force) Army (Department of the Army)	$29,593,152	4.4%	Rank history: not on the FY2021 list, #10 in FY2022, #3 in FY2023, #3 in FY2024 and #5 in FY2025; up 73 since Aug 2024–Jul 2025.
5	Augusta-Richmond County Government Top agencies Army (Department of the Army)	$22,803,829	3.4%	Rank history: #10 in FY2021, #8 in FY2022, #13 in FY2023, #9 in FY2024 and #7 in FY2025; up 7 since Aug 2024–Jul 2025.
6	Schutt Industries of Clintonville, Wis., Inc. Top agencies Army (Department of the Army)	$20,094,180	3.0%	Rank history: not on the FY2021–FY2024 lists and #11 in FY2025; up 5 since Aug 2024–Jul 2025.
7	American Water Enterprises, LLC Top agencies Army (Department of the Army)	$15,803,881	2.4%	Rank history: #3 in FY2021, #6 in FY2022, #8 in FY2023, #10 in FY2024 and #10 in FY2025; up 3 since Aug 2024–Jul 2025.
8	Base Utilities Inc. Top agencies USAF (Department of the Air Force)	$15,014,528	2.2%	Rank history: #7 in FY2021, #9 in FY2022, #10 in FY2023, #11 in FY2024 and #12 in FY2025; up 5 since Aug 2024–Jul 2025.
9	Washington Suburban Sanitary Commission Top agencies HHS (Department of Health and Human Services) NASA (National Aeronautics and Space Administration) NARA (National Archives and Records Administration)	$12,146,345	1.8%	Rank history: #9 in FY2021, #7 in FY2022, #7 in FY2023, #8 in FY2024 and #9 in FY2025; up 6 since Aug 2024–Jul 2025.
10	Foreign Utility Consolidated Reporting Top agencies Army (Department of the Army)	$11,981,247	1.8%	Rank history: #13 in FY2021, #12 in FY2022, #12 in FY2023, #12 in FY2024 and #13 in FY2025; up 4 since Aug 2024–Jul 2025.
11	Clear Lake City Water Authority Top agencies NASA (National Aeronautics and Space Administration)	$10,913,216	1.6%	Rank history: #52 in FY2021, #74 in FY2022, #51 in FY2023, #24 in FY2024 and #50 in FY2025; up 39 since Aug 2024–Jul 2025.
12	Central Coast Water Authority Top agencies USAF (Department of the Air Force)	$9,652,762	1.4%	Rank history: #15 in FY2021, #16 in FY2022, #15 in FY2023, #14 in FY2024 and #16 in FY2025; up 5 since Aug 2024–Jul 2025.
13	Bristol Bay Native Corporation Through SES Energy Services LLC Top agencies Army (Department of the Army)	$9,538,130	1.4%	Rank history: not on the FY2021–FY2022 lists, #32 in FY2023, not on the FY2024 list and #24 in FY2025; new, not ranked in Aug 2024–Jul 2025.
14	County of Hardin Through Hardin County Water District NO. 1 Top agencies Army (Department of the Army)	$9,422,116	1.4%	Rank history: not on the FY2021–FY2023 lists, #21 in FY2024 and #8 in FY2025; down 5 since Aug 2024–Jul 2025.
15	Florida Governmental Utility Authority Top agencies USAF (Department of the Air Force)	$8,717,346	1.3%	Rank history: not on the FY2021–FY2024 lists and #15 in FY2025; up 5 since Aug 2024–Jul 2025.
16	City of Wildwood City Hall Top agencies DOJ (Department of Justice)	$5,700,937	0.9%	Rank history: #28 in FY2021, #27 in FY2022, #33 in FY2023, #27 in FY2024 and #21 in FY2025; up 7 since Aug 2024–Jul 2025.
17	Pyeongtaek-Si Water and Sewage Business Place Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$5,559,229	0.8%	Rank history: #16 in FY2021, #22 in FY2022, #25 in FY2023, #25 in FY2024 and #19 in FY2025; up 9 since Aug 2024–Jul 2025.
18	Antelope Valley East Kern Water Agency Top agencies USAF (Department of the Air Force)	$3,562,923	0.5%	Rank history: #22 in FY2021, #21 in FY2022, #21 in FY2023, #22 in FY2024 and #25 in FY2025; up 9 since Aug 2024–Jul 2025.
19	California Water Service Group Through California Water Service Co Top agencies USAF (Department of the Air Force) DCMA (Defense Contract Management Agency)	$3,523,429	0.5%	Rank history: #24 in FY2021, #32 in FY2022, #22 in FY2023, #20 in FY2024 and #26 in FY2025; up 2 since Aug 2024–Jul 2025.
20	Fayetteville Public Works Commission Top agencies Army (Department of the Army)	$3,221,624	0.5%	Rank history: not on the FY2021–FY2024 lists and #27 in FY2025; up 8 since Aug 2024–Jul 2025.
21	Epik-Aquashine JV LLC Top agencies DOS (Department of State)	$3,095,000	0.5%	Rank history: not on the FY2021–FY2024 lists and #28 in FY2025; new, not ranked in Aug 2024–Jul 2025.
22	Northeast Ohio Regional Sewer District Top agencies NASA (National Aeronautics and Space Administration)	$2,865,500	0.4%	Rank history: #30 in FY2021, #40 in FY2022, #30 in FY2023, #30 in FY2024 and #30 in FY2025; up 14 since Aug 2024–Jul 2025.
23	Ahtna Usa-Cdm JV Top agencies Army (Department of the Army)	$2,729,639	0.4%	Rank history: not on the FY2021–FY2024 lists and #3 in FY2025; down 20 since Aug 2024–Jul 2025.
24	Jungbu Water Supply Office Top agencies Army (Department of the Army)	$2,307,405	0.3%	Rank history: #27 in FY2021, #26 in FY2022, #31 in FY2023, #32 in FY2024 and #31 in FY2025; up 6 since Aug 2024–Jul 2025.
25	City of Aliceville Top agencies DOJ (Department of Justice)	$2,056,303	0.3%	Rank history: #37 in FY2021, #43 in FY2022, #35 in FY2023, #33 in FY2024 and #36 in FY2025; up 9 since Aug 2024–Jul 2025.
26	Evoqua Water Technologies LLC 6 awardees Top agencies VA (Department of Veterans Affairs) Navy (Department of the Navy) NASA (National Aeronautics and Space Administration)	$1,648,058	0.2%	Rank history: not on the FY2021–FY2023 lists, #38 in FY2024 and #37 in FY2025; up 36 since Aug 2024–Jul 2025.
27	DC Water & Sewer Authority Top agencies Treasury (Department of the Treasury) CFPB (Consumer Financial Protection Bureau) DOJ (Department of Justice)	$1,636,253	0.2%	Rank history: #64 in FY2021, #46 in FY2022, #71 in FY2023, #94 in FY2024 and not on the FY2025 list; up 94 since Aug 2024–Jul 2025.
28	City of Florence Top agencies DOJ (Department of Justice)	$1,606,140	0.2%	Rank history: #31 in FY2021, #31 in FY2022, not on the FY2023 list, #29 in FY2024 and #35 in FY2025; up 10 since Aug 2024–Jul 2025.
29	Pural Water Specialty Co. , Inc. Top agencies Army (Department of the Army)	$1,500,534	0.2%	Rank history: #14 in FY2021, #20 in FY2022, #14 in FY2023, #18 in FY2024 and #23 in FY2025; down 4 since Aug 2024–Jul 2025.
30	Bric LLC Top agencies DOI (Department of the Interior)	$1,457,915	0.2%	Rank history: not on the FY2021–FY2024 lists and #49 in FY2025; new, not ranked in Aug 2024–Jul 2025.
31	Forte Insurance (Cambodia) PLC Top agencies DOS (Department of State)	$1,426,261	0.2%	Rank history: #66 in FY2021, #84 in FY2022, #89 in FY2023, #43 in FY2024 and #46 in FY2025; up 13 since Aug 2024–Jul 2025.
32	Canadian Commercial Corporation Top agencies Navy (Department of the Navy)	$1,395,000	0.2%	Rank history: not on the FY2021–FY2024 lists and #41 in FY2025; new, not ranked in Aug 2024–Jul 2025.
33	City of Jacksonville Top agencies USAF (Department of the Air Force)	$1,383,754	0.2%	Rank history: not on the FY2021–FY2025 lists; up 212 since Aug 2024–Jul 2025.
34	Board of Water Commissioners of Columbus Top agencies Army (Department of the Army)	$1,181,020	0.2%	Rank history: #54 in FY2021, #79 in FY2022, #20 in FY2023, #35 in FY2024 and #44 in FY2025; up 13 since Aug 2024–Jul 2025.
35	Kyotango City Top agencies Army (Department of the Army)	$1,176,372	0.2%	Rank history: not on the FY2021 list, #42 in FY2022, #46 in FY2023, #41 in FY2024 and #45 in FY2025; up 8 since Aug 2024–Jul 2025.
36	City of Welch Top agencies DOJ (Department of Justice)	$1,156,590	0.2%	Rank history: #48 in FY2021, #53 in FY2022, #52 in FY2023, #40 in FY2024 and #51 in FY2025; up 17 since Aug 2024–Jul 2025.
37	Public Service Commission of Yazoo City Top agencies DOJ (Department of Justice)	$1,148,010	0.2%	Rank history: #35 in FY2021, #48 in FY2022, #38 in FY2023, #39 in FY2024 and #47 in FY2025; up 9 since Aug 2024–Jul 2025.
38	Henry Miller Reclaimation District 2131 Top agencies DOI (Department of the Interior)	$1,078,352	0.2%	Rank history: not on the FY2021–FY2024 lists and #32 in FY2025; up 11 since Aug 2024–Jul 2025.
39	Solid Blend Technologies, Inc. Top agencies VA (Department of Veterans Affairs)	$1,061,617	0.2%	Rank history: not on the FY2021–FY2023 lists, #28 in FY2024 and #38 in FY2025; down 8 since Aug 2024–Jul 2025.
40	Town of Alderson Top agencies DOJ (Department of Justice)	$967,235	0.1%	Rank history: #72 in FY2021, #78 in FY2022, #73 in FY2023, #52 in FY2024 and #58 in FY2025; up 23 since Aug 2024–Jul 2025.
41	Contra Costa Water District Inc Top agencies Army (Department of the Army)	$941,017	0.1%	Rank history: not on the FY2021–FY2024 lists and #71 in FY2025; up 27 since Aug 2024–Jul 2025.
42	Aviate Enterprises, Inc. Top agencies VA (Department of Veterans Affairs) DOJ (Department of Justice) USAF (Department of the Air Force)	$928,966	0.1%	Rank history: not on the FY2021–FY2023 lists, #56 in FY2024 and #42 in FY2025; up 6 since Aug 2024–Jul 2025.
43	Dofine Sprinkler Rebuilders Inc. Top agencies USDA (Department of Agriculture)	$882,171	0.1%	Rank history: not on the FY2021–FY2024 lists and #61 in FY2025; new, not ranked in Aug 2024–Jul 2025.
44	Columbiana County Top agencies DOJ (Department of Justice)	$862,805	0.1%	Rank history: #36 in FY2021, not on the FY2022 list, #69 in FY2023, #49 in FY2024 and #56 in FY2025; up 15 since Aug 2024–Jul 2025.
45	Woodway Water Authority Top agencies DOJ (Department of Justice)	$857,986	0.1%	Rank history: #65 in FY2021, #87 in FY2022, #76 in FY2023, #54 in FY2024 and #62 in FY2025; up 27 since Aug 2024–Jul 2025.
46	Liquitech, Inc. Top agencies VA (Department of Veterans Affairs)	$838,247	0.1%	Rank history: not on the FY2021 list, #65 in FY2022, #88 in FY2023, #86 in FY2024 and #67 in FY2025; up 28 since Aug 2024–Jul 2025.
47	Department of Water Resources Oregon Top agencies DOI (Department of the Interior)	$809,012	0.1%	Rank history: not on the FY2021 list, #95 in FY2022, not on the FY2023 list, #93 in FY2024 and #74 in FY2025; up 17 since Aug 2024–Jul 2025.
48	Weeminuche Construction Authority Through WCA Construction, LLC Top agencies DOI (Department of the Interior)	$781,876	0.1%	Rank history: not on the FY2021–FY2023 lists, #31 in FY2024 and not on the FY2025 list; down 15 since Aug 2024–Jul 2025.
49	City of Prestonsburg Through Prestonsburg City Utilities Commission Top agencies DOJ (Department of Justice)	$752,150	0.1%	Rank history: #73 in FY2021, #71 in FY2022, #62 in FY2023, #78 in FY2024 and #65 in FY2025; new, not ranked in Aug 2024–Jul 2025.
50	Seikitokyu Kogyo Co., Ltd. Top agencies Army (Department of the Army)	$748,695	0.1%	Rank history: not on the FY2021–FY2024 lists and #59 in FY2025; new, not ranked in Aug 2024–Jul 2025.
51	City of Cocoa Top agencies NASA (National Aeronautics and Space Administration)	$739,470	0.1%	Rank history: #90 in FY2021, #47 in FY2022, #47 in FY2023, #42 in FY2024 and #39 in FY2025; down 14 since Aug 2024–Jul 2025.
52	Fluid Solutions LLC Top agencies DOS (Department of State)	$735,941	0.1%	Rank history: #98 in FY2021, not on the FY2022 list, #87 in FY2023, #64 in FY2024 and #53 in FY2025; up 4 since Aug 2024–Jul 2025.
53	Water Treatment Specialists Inc. Top agencies VA (Department of Veterans Affairs)	$728,553	0.1%	Rank history: not on the FY2021–FY2022 lists, #75 in FY2023, not on the FY2024 list and #95 in FY2025; up 39 since Aug 2024–Jul 2025.
54	City of Lawrence Top agencies DOI (Department of the Interior)	$664,979	0.1%	Rank history: not on the FY2021–FY2023 lists, #73 in FY2024 and not on the FY2025 list; up 143 since Aug 2024–Jul 2025.
55	Gunsan City Hall Climate and Environment Bureau Top agencies USAF (Department of the Air Force)	$622,594	0.1%	Rank history: not on the FY2021–FY2024 lists and #70 in FY2025; up 82 since Aug 2024–Jul 2025.
56	City of El Reno Top agencies DOJ (Department of Justice)	$596,081	0.1%	Rank history: #62 in FY2021, #62 in FY2022, #68 in FY2023, #47 in FY2024 and #57 in FY2025; up 2 since Aug 2024–Jul 2025.
57	City of Fort Worth Top agencies Treasury (Department of the Treasury) Army (Department of the Army)	$585,245	0.1%	Rank history: #89 in FY2021, #41 in FY2022, #34 in FY2023, not on the FY2024 list and #69 in FY2025; new, not ranked in Aug 2024–Jul 2025.
58	Taylor Engineering, PLLC Top agencies Army (Department of the Army)	$580,199	0.1%	Rank history: not on the FY2021–FY2024 lists and #81 in FY2025; up 20 since Aug 2024–Jul 2025.
59	Utility Systems of Georgia, Inc. Top agencies Army (Department of the Army)	$575,364	0.1%	Rank history: #60 in FY2021, #75 in FY2022, #66 in FY2023, #48 in FY2024 and #55 in FY2025; down 4 since Aug 2024–Jul 2025.
60	Coventina Water, LLC Top agencies VA (Department of Veterans Affairs) USAF (Department of the Air Force)	$571,094	0.1%	Rank history: not on the FY2021–FY2023 lists, #77 in FY2024 and #40 in FY2025; down 21 since Aug 2024–Jul 2025.
61	East Range Partners LLC Top agencies VA (Department of Veterans Affairs)	$569,882	0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Aug 2024–Jul 2025.
62	Ecolab Inc. 2 awardees, including Nalco Water Pretreatment Solutions, LLC and Nalco Company LLC Top agencies VA (Department of Veterans Affairs)	$558,857	0.1%	Rank history: not on the FY2021–FY2024 lists and #77 in FY2025; up 13 since Aug 2024–Jul 2025.
63	US Diversified Contracting Services Inc. Top agencies VA (Department of Veterans Affairs)	$528,839	0.1%	Rank history: not on the FY2021–FY2024 lists and #29 in FY2025; down 34 since Aug 2024–Jul 2025.
64	Coastline Ltd. Top agencies Smithsonian (Smithsonian Institution) USAF (Department of the Air Force)	$496,713	0.1%	Rank history: not on the FY2021–FY2025 lists; up 102 since Aug 2024–Jul 2025.
65	Cabin Creek Services LLC Top agencies DOI (Department of the Interior)	$492,885	0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Aug 2024–Jul 2025.
66	Tidewater Utilities Inc Top agencies USAF (Department of the Air Force)	$491,762	0.1%	Rank history: not on the FY2021–FY2024 lists and #75 in FY2025; up 17 since Aug 2024–Jul 2025.
67	Hydro Service & Supplies Inc. 3 awardees Top agencies HHS (Department of Health and Human Services) Commerce (Department of Commerce) VA (Department of Veterans Affairs)	$488,989	0.1%	Rank history: not on the FY2021–FY2023 lists, #97 in FY2024 and #94 in FY2025; up 63 since Aug 2024–Jul 2025.
68	Davis Water Service Inc Top agencies VA (Department of Veterans Affairs)	$488,200	0.1%	Rank history: not on the FY2021–FY2025 lists; up 295 since Aug 2024–Jul 2025.
69	City of Manchester Top agencies DOJ (Department of Justice)	$465,732	0.1%	Rank history: #45 in FY2021, not on the FY2022–FY2023 lists, #92 in FY2024 and #97 in FY2025; up 80 since Aug 2024–Jul 2025.
70	T-L Irrigation Co. Top agencies USDA (Department of Agriculture)	$465,033	0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Aug 2024–Jul 2025.
71	Numunu Staffing LLC Top agencies Army (Department of the Army)	$443,842	0.1%	Rank history: not on the FY2021–FY2023 lists, #19 in FY2024 and not on the FY2025 list; new, not ranked in Aug 2024–Jul 2025.
72	Essential Utilities, Inc. Top agencies DOJ (Department of Justice)	$437,699	0.1%	Rank history: #99 in FY2021, not on the FY2022 list, #100 in FY2023, #81 in FY2024 and #76 in FY2025; up 9 since Aug 2024–Jul 2025.
73	Hydro, Inc. Top agencies HHS (Department of Health and Human Services)	$424,278	0.1%	Rank history: not on the FY2021–FY2023 lists, #74 in FY2024 and #87 in FY2025; up 12 since Aug 2024–Jul 2025.
74	Prime Projects International (Construction ) Limited Top agencies DOS (Department of State) Army (Department of the Army)	$421,922	0.1%	Rank history: not on the FY2021–FY2024 lists and #86 in FY2025; new, not ranked in Aug 2024–Jul 2025.
75	Daegu Metropolitan City Top agencies Army (Department of the Army)	$400,000	0.1%	Rank history: not on the FY2021–FY2024 lists and #79 in FY2025; up 7 since Aug 2024–Jul 2025.
76	City of Newport News Top agencies NASA (National Aeronautics and Space Administration)	$388,658	0.1%	Rank history: #94 in FY2021, not on the FY2022 list, #86 in FY2023, #60 in FY2024 and not on the FY2025 list; up 31 since Aug 2024–Jul 2025.
77	Sentinel Services, LLC Top agencies VA (Department of Veterans Affairs)	$383,160	0.1%	Rank history: not on the FY2021–FY2024 lists and #68 in FY2025; down 12 since Aug 2024–Jul 2025.
78	Sterileco LLC Top agencies VA (Department of Veterans Affairs)	$365,400	0.1%	Rank history: not on the FY2021–FY2025 lists; up 335 since Aug 2024–Jul 2025.
79	Enviroh20 LLC Top agencies VA (Department of Veterans Affairs)	$363,062	0.1%	Rank history: not on the FY2021–FY2023 lists, #59 in FY2024 and #63 in FY2025; down 19 since Aug 2024–Jul 2025.
80	Mobile Medical International Corporation Through Verda Medical Systems, LLC Top agencies VA (Department of Veterans Affairs)	$358,778	0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Aug 2024–Jul 2025.
81	Green and Sustainable Services, LLC Top agencies USAF (Department of the Air Force)	$357,480	0.1%	Rank history: not on the FY2021 list, #83 in FY2022, #92 in FY2023, #68 in FY2024 and #73 in FY2025; down 12 since Aug 2024–Jul 2025.
82	SWK Stadtwerke Kaiserslautern Versorgungs-Ag Top agencies USAF (Department of the Air Force)	$336,211	0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Aug 2024–Jul 2025.
83	Filtration Technology, Inc. Top agencies DOI (Department of the Interior)	$317,066	<0.1%	Rank history: not on the FY2021–FY2023 lists, #90 in FY2024 and #89 in FY2025; up 4 since Aug 2024–Jul 2025.
84	Veolia WTS Services USA Inc Top agencies Navy (Department of the Navy)	$316,022	<0.1%	Rank history: not on the FY2021–FY2023 lists, #82 in FY2024 and #84 in FY2025; up 13 since Aug 2024–Jul 2025.
85	SKE Support Services GMBH Top agencies Army (Department of the Army)	$308,625	<0.1%	Rank history: not on the FY2021–FY2025 lists; up 138 since Aug 2024–Jul 2025.
86	Herlong Public Utility District Top agencies DOJ (Department of Justice)	$304,289	<0.1%	Rank history: not on the FY2021 list, #60 in FY2022, #63 in FY2023, #89 in FY2024 and not on the FY2025 list; up 14 since Aug 2024–Jul 2025.
87	Onsite Water Management LLC Top agencies Army (Department of the Army) DOI (Department of the Interior)	$304,261	<0.1%	Rank history: not on the FY2021–FY2024 lists and #34 in FY2025; down 52 since Aug 2024–Jul 2025.
88	Daiichi Bussan Co., Ltd. Top agencies USAF (Department of the Air Force)	$299,120	<0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Aug 2024–Jul 2025.
89	City of Berlin Top agencies DOJ (Department of Justice)	$291,559	<0.1%	Rank history: not on the FY2021–FY2024 lists and #99 in FY2025; up 2 since Aug 2024–Jul 2025.
90	New York City Water Board Top agencies SSA (Social Security Administration)	$290,000	<0.1%	Rank history: not on the FY2021–FY2025 lists; up 136 since Aug 2024–Jul 2025.
91	City of Clarksburg Through Clarksburg Water Board Top agencies DOJ (Department of Justice)	$283,200	<0.1%	Rank history: not on the FY2021–FY2025 lists; up 17 since Aug 2024–Jul 2025.
92	City of Philadelphia Department of Revenue Water Revenue Bureau B0610658047 Top agencies Treasury (Department of the Treasury)	$277,470	<0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Aug 2024–Jul 2025.
93	The Water Works and Sewer Board of the City of Anniston, Alabama Top agencies DHS (Department of Homeland Security)	$253,989	<0.1%	Rank history: not on the FY2021–FY2023 lists, #63 in FY2024 and not on the FY2025 list; down 27 since Aug 2024–Jul 2025.
94	Ama Diversified Construction Group Top agencies Army (Department of the Army)	$251,048	<0.1%	Rank history: not on the FY2021–FY2022 lists, #99 in FY2023 and not on the FY2024–FY2025 lists; up 19 since Aug 2024–Jul 2025.
95	Aqua-Serv Engineers, Inc. Top agencies VA (Department of Veterans Affairs) HHS (Department of Health and Human Services) USAF (Department of the Air Force)	$250,949	<0.1%	Rank history: not on the FY2021–FY2025 lists; up 220 since Aug 2024–Jul 2025.
96	East RIO Hondo Water Supply Corp Top agencies DHS (Department of Homeland Security)	$250,000	<0.1%	Rank history: not on the FY2021–FY2023 lists, #99 in FY2024 and not on the FY2025 list; up 122 since Aug 2024–Jul 2025.
97	Venergy Group LLC Top agencies VA (Department of Veterans Affairs) DOJ (Department of Justice)	$249,568	<0.1%	Rank history: not on the FY2021–FY2024 lists and #64 in FY2025; down 26 since Aug 2024–Jul 2025.
98	City of San Diego Top agencies IBWC (International Boundary and Water Commission U.S.-Mexico)	$245,520	<0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Aug 2024–Jul 2025.
99	Town of Emmitsburg Top agencies DHS (Department of Homeland Security)	$238,050	<0.1%	Rank history: not on the FY2021–FY2025 lists; up 45 since Aug 2024–Jul 2025.
100	Marquis Solutions LLC Top agencies VA (Department of Veterans Affairs)	$236,600	<0.1%	Rank history: not on the FY2021–FY2025 lists; up 16 since Aug 2024–Jul 2025.

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100 of 518 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	$651,626,558	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 $669 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. An awardee whose own actions mostly name no parent, and that no other company's actions name as their parent, rolls up its SAM.gov registration's chain of parent companies: it counts under the first company there that other companies' actions name as their parent, or under the parent most of a company's own actions name, whichever comes first; with neither, under the highest company in the chain with federal contracts of its own. Joint ventures stay companies of their own. 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.
Period: the trailing 12 months end with the last month that ended at least 90 days ago, because the Department of Defense reports its contract actions to FPDS about 90 days late. The list is rebuilt each night.
Rank changes compare with Aug 2024–Jul 2025. "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.
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 Aug 2025–Jul 2026?

1. American Water Works Company Inc. ($210M), 2. American States Water Company ($120M), 3. Jacobs Engineering Group Inc. ($43M), 4. Oklahoma City Water Utilities Trust ($29.6M), 5. Augusta-Richmond County Government ($22.8M), 6. Schutt Industries of Clintonville, Wis., Inc. ($20.1M), 7. American Water Enterprises, LLC ($15.8M), 8. Base Utilities Inc. ($15M), 9. Washington Suburban Sanitary Commission ($12.1M), 10. Foreign Utility Consolidated Reporting ($12M).

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