Top 100 Contractors in NAICS 221310: Water Supply and Irrigation Systems, Jul 2025–Jun 2026

Name: Top 100 Contractors in NAICS 221310: Water Supply and Irrigation Systems, Jul 2025–Jun 2026
Creator: GovTribe

Parent companies by net contract obligations Jul 1, 2025 – Jun 30, 2026 Code page on GovTribe

The top 10 won 68% of NAICS 221310 contract dollars from July 2025 through June 2026

Contract obligations: $651,551,933 Net of deobligations, by contracts coded NAICS 221310
Contractors: 534 Parent companies with an obligation
Largest contractor: American Water Works Company Inc. $202 million, 30.4% 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. 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)	$202,220,622	30.4%	Rank history: #1 in FY2021, #1 in FY2022, #1 in FY2023, #1 in FY2024 and #1 in FY2025; unchanged since Jul 2024–Jun 2025.
2	Fort Bliss Water Services Company 5 awardees, including Old North 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)	$68,388,522	10.3%	Rank history: not on the FY2021 list, #14 in FY2022, #6 in FY2023, #2 in FY2024 and #2 in FY2025; unchanged since Jul 2024–Jun 2025.
3	Jacobs Government Services Company 2 awardees, including Ch2M Hill Constructors, Inc. Top agencies Army (Department of the Army)	$40,295,633	6.1%	Rank history: not on the FY2021–FY2022 lists, #11 in FY2023, #4 in FY2024 and #4 in FY2025; up 2 since Jul 2024–Jun 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 69 since Jul 2024–Jun 2025.
5	Augusta-Richmond County Government Top agencies Army (Department of the Army)	$22,084,011	3.3%	Rank history: #10 in FY2021, #8 in FY2022, #13 in FY2023, #9 in FY2024 and #7 in FY2025; up 8 since Jul 2024–Jun 2025.
6	Emerald Coast Utility Services Inc. Top agencies USAF (Department of the Air Force)	$21,064,102	3.2%	Rank history: #6 in FY2021, #5 in FY2022, #5 in FY2023, #7 in FY2024 and #9 in FY2025; up 1 since Jul 2024–Jun 2025.
7	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 #13 in FY2025; up 4 since Jul 2024–Jun 2025.
8	American Water Enterprises, LLC Top agencies Army (Department of the Army)	$16,794,273	2.5%	Rank history: #3 in FY2021, #6 in FY2022, #8 in FY2023, #10 in FY2024 and #12 in FY2025; up 2 since Jul 2024–Jun 2025.
9	Fort Riley Utility Services, Inc. Top agencies Army (Department of the Army)	$15,056,232	2.3%	Rank history: #5 in FY2021, #3 in FY2022, #4 in FY2023, #5 in FY2024 and #11 in FY2025; down 1 since Jul 2024–Jun 2025.
10	Base Utilities Inc. Top agencies USAF (Department of the Air Force)	$15,014,528	2.3%	Rank history: #7 in FY2021, #9 in FY2022, #10 in FY2023, #11 in FY2024 and #14 in FY2025; up 4 since Jul 2024–Jun 2025.
11	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)	$12,329,356	1.9%	Rank history: #9 in FY2021, #7 in FY2022, #7 in FY2023, #8 in FY2024 and #10 in FY2025; up 4 since Jul 2024–Jun 2025.
12	Foreign Utility Consolidated Reporting Top agencies Army (Department of the Army)	$10,965,078	1.6%	Rank history: #13 in FY2021, #12 in FY2022, #12 in FY2023, #12 in FY2024 and #15 in FY2025; unchanged since Jul 2024–Jun 2025.
13	County of Hardin Through Hardin County Water District NO. 1 Top agencies Army (Department of the Army)	$10,661,301	1.6%	Rank history: not on the FY2021–FY2023 lists, #21 in FY2024 and #8 in FY2025; down 4 since Jul 2024–Jun 2025.
14	Central Coast Water Authority Top agencies USAF (Department of the Air Force)	$9,652,762	1.5%	Rank history: #15 in FY2021, #16 in FY2022, #15 in FY2023, #14 in FY2024 and #18 in FY2025; up 3 since Jul 2024–Jun 2025.
15	SES Energy Services LLC Top agencies Army (Department of the Army)	$9,538,130	1.4%	Rank history: not on the FY2021–FY2023 lists, #17 in FY2024 and #27 in FY2025; new, not ranked in Jul 2024–Jun 2025.
16	Bay State Utility Services, LLC Top agencies USAF (Department of the Air Force)	$9,192,098	1.4%	Rank history: not on the FY2021–FY2024 lists and #21 in FY2025; new, not ranked in Jul 2024–Jun 2025.
17	Clear Lake City Water Authority Top agencies NASA (National Aeronautics and Space Administration)	$8,975,961	1.3%	Rank history: #52 in FY2021, #74 in FY2022, #51 in FY2023, #24 in FY2024 and #53 in FY2025; up 33 since Jul 2024–Jun 2025.
18	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 #17 in FY2025; up 1 since Jul 2024–Jun 2025.
19	City of Wildwood City Hall Top agencies DOJ (Department of Justice)	$7,138,908	1.1%	Rank history: #28 in FY2021, #27 in FY2022, #33 in FY2023, #27 in FY2024 and #24 in FY2025; up 6 since Jul 2024–Jun 2025.
20	GTA Containers, LLC Top agencies Army (Department of the Army)	$4,689,008	0.7%	Rank history: not on the FY2021–FY2022 lists, #18 in FY2023, #15 in FY2024 and #20 in FY2025; up 6 since Jul 2024–Jun 2025.
21	Antelope Valley East Kern Water Agency Top agencies USAF (Department of the Air Force)	$4,582,136	0.7%	Rank history: #22 in FY2021, #21 in FY2022, #21 in FY2023, #22 in FY2024 and #28 in FY2025; up 6 since Jul 2024–Jun 2025.
22	Pyeongtaek-Si Water and Sewage Business Place Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$4,469,229	0.7%	Rank history: #16 in FY2021, #22 in FY2022, #25 in FY2023, #25 in FY2024 and #22 in FY2025; up 1 since Jul 2024–Jun 2025.
23	Fayetteville Public Works Commission Top agencies Army (Department of the Army)	$4,141,624	0.6%	Rank history: not on the FY2021–FY2024 lists and #30 in FY2025; up 6 since Jul 2024–Jun 2025.
24	California Water Service Group Through California Water Service Co Top agencies USAF (Department of the Air Force) DCMA (Defense Contract Management Agency)	$3,475,667	0.5%	Rank history: #24 in FY2021, #32 in FY2022, #22 in FY2023, #20 in FY2024 and #29 in FY2025; down 4 since Jul 2024–Jun 2025.
25	Epik-Aquashine JV LLC Top agencies DOS (Department of State)	$3,095,000	0.5%	Rank history: not on the FY2021–FY2024 lists and #31 in FY2025; new, not ranked in Jul 2024–Jun 2025.
26	Jungbu Water Supply Office Top agencies Army (Department of the Army)	$2,852,037	0.4%	Rank history: #27 in FY2021, #26 in FY2022, #31 in FY2023, #32 in FY2024 and #34 in FY2025; up 4 since Jul 2024–Jun 2025.
27	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 24 since Jul 2024–Jun 2025.
28	City of Aliceville Top agencies DOJ (Department of Justice)	$2,556,623	0.4%	Rank history: #37 in FY2021, #43 in FY2022, #35 in FY2023, #33 in FY2024 and #39 in FY2025; up 13 since Jul 2024–Jun 2025.
29	Bering-Weston JV, LLC Top agencies Army (Department of the Army)	$2,253,699	0.3%	Rank history: not on the FY2021–FY2024 lists and #6 in FY2025; down 23 since Jul 2024–Jun 2025.
30	Northeast Ohio Regional Sewer District Top agencies NASA (National Aeronautics and Space Administration)	$2,145,000	0.3%	Rank history: #30 in FY2021, #40 in FY2022, #30 in FY2023, #30 in FY2024 and #33 in FY2025; up 1 since Jul 2024–Jun 2025.
31	Onsite Water Management LLC Top agencies Army (Department of the Army) DOI (Department of the Interior)	$2,065,981	0.3%	Rank history: not on the FY2021–FY2024 lists and #37 in FY2025; new, not ranked in Jul 2024–Jun 2025.
32	Pural Water Specialty Co. , Inc. Top agencies Army (Department of the Army)	$1,923,652	0.3%	Rank history: #14 in FY2021, #20 in FY2022, #14 in FY2023, #18 in FY2024 and #26 in FY2025; down 8 since Jul 2024–Jun 2025.
33	City of Florence Top agencies DOJ (Department of Justice)	$1,794,122	0.3%	Rank history: #31 in FY2021, #31 in FY2022, not on the FY2023 list, #29 in FY2024 and #38 in FY2025; up 16 since Jul 2024–Jun 2025.
34	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 83 since Jul 2024–Jun 2025.
35	Bric LLC Top agencies DOI (Department of the Interior)	$1,457,915	0.2%	Rank history: not on the FY2021–FY2024 lists and #52 in FY2025; new, not ranked in Jul 2024–Jun 2025.
36	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 #49 in FY2025; up 7 since Jul 2024–Jun 2025.
37	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 207 since Jul 2024–Jun 2025.
38	Fluid Handling LLC 4 awardees, including Evoqua Water Technologies LLC Top agencies VA (Department of Veterans Affairs) Navy (Department of the Navy) HHS (Department of Health and Human Services)	$1,381,606	0.2%	Rank history: not on the FY2021–FY2024 lists and #48 in FY2025; up 39 since Jul 2024–Jun 2025.
39	Canadian Commercial Corporation Top agencies Navy (Department of the Navy)	$1,375,000	0.2%	Rank history: not on the FY2021–FY2024 lists and #43 in FY2025; new, not ranked in Jul 2024–Jun 2025.
40	Board of Water Commissioners of Columbus Top agencies Army (Department of the Army)	$1,342,287	0.2%	Rank history: #54 in FY2021, #79 in FY2022, #20 in FY2023, #35 in FY2024 and #46 in FY2025; up 7 since Jul 2024–Jun 2025.
41	City of Welch Top agencies DOJ (Department of Justice)	$1,268,675	0.2%	Rank history: #48 in FY2021, #53 in FY2022, #52 in FY2023, #40 in FY2024 and #54 in FY2025; up 17 since Jul 2024–Jun 2025.
42	Public Service Commission of Yazoo City Top agencies DOJ (Department of Justice)	$1,210,010	0.2%	Rank history: #35 in FY2021, #48 in FY2022, #38 in FY2023, #39 in FY2024 and #50 in FY2025; up 10 since Jul 2024–Jun 2025.
43	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 #47 in FY2025; down 1 since Jul 2024–Jun 2025.
44	Goldbelt Global LLC Top agencies Army (Department of the Army)	$1,138,534	0.2%	Rank history: not on the FY2021–FY2024 lists and #23 in FY2025; down 22 since Jul 2024–Jun 2025.
45	Department of Water Resources Oregon Top agencies DOI (Department of the Interior)	$1,114,940	0.2%	Rank history: not on the FY2021 list, #95 in FY2022, not on the FY2023 list, #93 in FY2024 and #78 in FY2025; up 55 since Jul 2024–Jun 2025.
46	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 #35 in FY2025; down 2 since Jul 2024–Jun 2025.
47	Aviate Enterprises, Inc. Top agencies VA (Department of Veterans Affairs) DOJ (Department of Justice) USAF (Department of the Air Force)	$1,065,816	0.2%	Rank history: not on the FY2021–FY2023 lists, #56 in FY2024 and #44 in FY2025; down 1 since Jul 2024–Jun 2025.
48	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 #40 in FY2025; down 16 since Jul 2024–Jun 2025.
49	Town of Alderson Top agencies DOJ (Department of Justice)	$1,018,067	0.2%	Rank history: #72 in FY2021, #78 in FY2022, #73 in FY2023, #52 in FY2024 and #61 in FY2025; up 8 since Jul 2024–Jun 2025.
50	Contra Costa Water District Inc Top agencies Army (Department of the Army)	$934,618	0.1%	Rank history: not on the FY2021–FY2024 lists and #75 in FY2025; up 14 since Jul 2024–Jun 2025.
51	Woodway Water Authority Top agencies DOJ (Department of Justice)	$929,493	0.1%	Rank history: #65 in FY2021, #87 in FY2022, #76 in FY2023, #54 in FY2024 and #65 in FY2025; up 14 since Jul 2024–Jun 2025.
52	Columbiana County Top agencies DOJ (Department of Justice)	$896,329	0.1%	Rank history: #36 in FY2021, not on the FY2022 list, #69 in FY2023, #49 in FY2024 and #58 in FY2025; up 20 since Jul 2024–Jun 2025.
53	Dofine Sprinkler Rebuilders Inc. Top agencies USDA (Department of Agriculture)	$882,171	0.1%	Rank history: not on the FY2021–FY2024 lists and #64 in FY2025; new, not ranked in Jul 2024–Jun 2025.
54	City of Cocoa Top agencies NASA (National Aeronautics and Space Administration)	$871,711	0.1%	Rank history: #90 in FY2021, #47 in FY2022, #47 in FY2023, #42 in FY2024 and #41 in FY2025; down 19 since Jul 2024–Jun 2025.
55	Prestonsburg City Utilities Commission Top agencies DOJ (Department of Justice)	$868,422	0.1%	Rank history: not on the FY2021–FY2023 lists, #87 in FY2024 and #69 in FY2025; up 25 since Jul 2024–Jun 2025.
56	Liquitech, Inc. Top agencies VA (Department of Veterans Affairs)	$819,012	0.1%	Rank history: not on the FY2021 list, #65 in FY2022, #88 in FY2023, #86 in FY2024 and #71 in FY2025; up 33 since Jul 2024–Jun 2025.
57	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 23 since Jul 2024–Jun 2025.
58	Fluid Solutions LLC Top agencies DOS (Department of State)	$755,976	0.1%	Rank history: #98 in FY2021, not on the FY2022 list, #87 in FY2023, #64 in FY2024 and #55 in FY2025; down 5 since Jul 2024–Jun 2025.
59	Sentinel Services, LLC Top agencies VA (Department of Veterans Affairs)	$755,160	0.1%	Rank history: not on the FY2021–FY2024 lists and #72 in FY2025; up 57 since Jul 2024–Jun 2025.
60	Seikitokyu Kogyo Co., Ltd. Top agencies Army (Department of the Army)	$748,695	0.1%	Rank history: not on the FY2021–FY2024 lists and #62 in FY2025; new, not ranked in Jul 2024–Jun 2025.
61	City of El Reno Top agencies DOJ (Department of Justice)	$735,081	0.1%	Rank history: #62 in FY2021, #62 in FY2022, #68 in FY2023, #47 in FY2024 and #60 in FY2025; down 1 since Jul 2024–Jun 2025.
62	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 #99 in FY2025; up 29 since Jul 2024–Jun 2025.
63	Advantix Engineering Corp Top agencies USDA (Department of Agriculture)	$717,582	0.1%	Rank history: not on the FY2021–FY2022 lists, #29 in FY2023, not on the FY2024 list and #56 in FY2025; up 58 since Jul 2024–Jun 2025.
64	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 136 since Jul 2024–Jun 2025.
65	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 #74 in FY2025; up 69 since Jul 2024–Jun 2025.
66	Essential Utilities, Inc. Top agencies DOJ (Department of Justice)	$597,699	0.1%	Rank history: #99 in FY2021, not on the FY2022 list, #100 in FY2023, #81 in FY2024 and #80 in FY2025; up 10 since Jul 2024–Jun 2025.
67	City of Fort Worth Top agencies Treasury (Department of the Treasury) Army (Department of the Army)	$585,245	0.1%	Rank history: not on the FY2021–FY2023 lists, #67 in FY2024 and #73 in FY2025; down 5 since Jul 2024–Jun 2025.
68	Taylor Engineering, PLLC Top agencies Army (Department of the Army)	$580,199	0.1%	Rank history: not on the FY2021–FY2024 lists and #85 in FY2025; up 6 since Jul 2024–Jun 2025.
69	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 #57 in FY2025; down 18 since Jul 2024–Jun 2025.
70	Coventina Water, LLC Top agencies VA (Department of Veterans Affairs) USAF (Department of the Air Force)	$571,753	0.1%	Rank history: not on the FY2021–FY2023 lists, #77 in FY2024 and #42 in FY2025; down 33 since Jul 2024–Jun 2025.
71	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 Jul 2024–Jun 2025.
72	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 #81 in FY2025; down 2 since Jul 2024–Jun 2025.
73	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 #32 in FY2025; down 45 since Jul 2024–Jun 2025.
74	Coastline Ltd. Top agencies Smithsonian (Smithsonian Institution) USAF (Department of the Air Force)	$505,463	0.1%	Rank history: not on the FY2021–FY2025 lists; up 102 since Jul 2024–Jun 2025.
75	Tidewater Utilities Inc Top agencies USAF (Department of the Air Force)	$491,762	0.1%	Rank history: not on the FY2021–FY2024 lists and #79 in FY2025; unchanged since Jul 2024–Jun 2025.
76	Davis Water Service Inc Top agencies VA (Department of Veterans Affairs)	$488,200	0.1%	Rank history: not on the FY2021–FY2025 lists; up 286 since Jul 2024–Jun 2025.
77	Hydro Service & Supplies, Inc. Top agencies HHS (Department of Health and Human Services) Commerce (Department of Commerce) DHA (Defense Health Agency)	$462,343	0.1%	Rank history: not on the FY2021–FY2025 lists; up 63 since Jul 2024–Jun 2025.
78	City of Manchester Top agencies DOJ (Department of Justice)	$460,718	0.1%	Rank history: #45 in FY2021, not on the FY2022–FY2023 lists, #92 in FY2024 and not on the FY2025 list; up 25 since Jul 2024–Jun 2025.
79	Cabin Creek Services LLC Top agencies DOI (Department of the Interior)	$455,576	0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
80	Veterans Construction and Design Inc. Top agencies DOI (Department of the Interior)	$445,000	0.1%	Rank history: not on the FY2021–FY2024 lists and #86 in FY2025; new, not ranked in Jul 2024–Jun 2025.
81	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 Jul 2024–Jun 2025.
82	Verda Medical Systems, LLC Top agencies VA (Department of Veterans Affairs)	$431,725	0.1%	Rank history: not on the FY2021–FY2025 lists; up 128 since Jul 2024–Jun 2025.
83	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 #91 in FY2025; down 17 since Jul 2024–Jun 2025.
84	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 #90 in FY2025; new, not ranked in Jul 2024–Jun 2025.
85	City of Berlin Top agencies DOJ (Department of Justice)	$421,559	0.1%	Rank history: not on the FY2021–FY2025 lists; up 23 since Jul 2024–Jun 2025.
86	Herlong Public Utility District Top agencies DOJ (Department of Justice)	$404,741	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 32 since Jul 2024–Jun 2025.
87	City of Danbury CT Top agencies DOJ (Department of Justice)	$390,958	0.1%	Rank history: #39 in FY2021, #59 in FY2022, #61 in FY2023, #50 in FY2024 and #63 in FY2025; up 3 since Jul 2024–Jun 2025.
88	City of Newport News Top agencies NASA (National Aeronautics and Space Administration)	$386,617	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 16 since Jul 2024–Jun 2025.
89	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 #66 in FY2025; down 30 since Jul 2024–Jun 2025.
90	Daegu Metropolitan City Top agencies Army (Department of the Army)	$359,162	0.1%	Rank history: not on the FY2021–FY2024 lists and #83 in FY2025; down 12 since Jul 2024–Jun 2025.
91	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 #77 in FY2025; down 28 since Jul 2024–Jun 2025.
92	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 Jul 2024–Jun 2025.
93	Evoqua Water Technologies LLC 3 awardees Top agencies VA (Department of Veterans Affairs) Navy (Department of the Navy) Commerce (Department of Commerce)	$323,235	<0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
94	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 #88 in FY2025; down 10 since Jul 2024–Jun 2025.
95	Preston County Public Service District NO4 Top agencies DOJ (Department of Justice)	$313,431	<0.1%	Rank history: #47 in FY2021, #52 in FY2022, #60 in FY2023, #44 in FY2024 and #51 in FY2025; down 41 since Jul 2024–Jun 2025.
96	SKE Support Services GMBH Top agencies Army (Department of the Army)	$308,625	<0.1%	Rank history: not on the FY2021–FY2025 lists; up 126 since Jul 2024–Jun 2025.
97	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 Jul 2024–Jun 2025.
98	Paramount Construction Group, LLC Top agencies VA (Department of Veterans Affairs)	$289,032	<0.1%	Rank history: not on the FY2021–FY2025 lists; up 148 since Jul 2024–Jun 2025.
99	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 6 since Jul 2024–Jun 2025.
100	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 Jul 2024–Jun 2025.

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100 of 534 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 $665 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.
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 Jul 2024–Jun 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 221310 contractors in Jul 2025–Jun 2026?

1. American Water Works Company Inc. ($202M), 2. Fort Bliss Water Services Company ($68.4M), 3. Jacobs Government Services Company ($40.3M), 4. Oklahoma City Water Utilities Trust ($29.6M), 5. Augusta-Richmond County Government ($22.1M), 6. Emerald Coast Utility Services Inc. ($21.1M), 7. Schutt Industries of Clintonville, Wis., Inc. ($20.1M), 8. American Water Enterprises, LLC ($16.8M), 9. Fort Riley Utility Services, Inc. ($15.1M), 10. Base Utilities Inc. ($15M).

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