Loading…

Search every US federal contract opportunity on SAM.gov, and draft winning RFP responses with AI.

Solutions

Contract search AI proposal writing Bid / no-bid scoring Buyer & market intelligence Forecast & recompetes Awards & competitors Teaming & partner network State & local contracts Pipeline & CRM

Find Contracts

All contracts Closing soon Recently posted Highest value Buyer Intelligence What’s coming up Who’s winning (awards)8(a) set-asides WOSB set-asides SDVOSB set-asides HUBZone set-asides

Agency opportunities

DoD contracts VA contracts HHS contracts DHS contracts DOE contracts GSA contracts DOT contracts NASA contracts

Tools & Pricing

AI Opportunity Scan Contract Pricing Benchmark Competitor & Incumbent Lookup Company Award Profile GovCon Market Explorer Supplier & Teaming Finder AI Pursuit Analyzer NAICS Code Lookup Set-Aside Eligibility Small Business Size Standard Acquisition Threshold Guide Bid / No-Bid Scorecard Bid ROI Calculator CMMC 2.0 / SPRS Estimator HUBZone Eligibility Checker Plans & pricing

Learn

Market Reports Blog Answers (Q&A)Resources Glossary A–Z Guides Compare tools 2026 data report

Company

About Contact sales Security & trust Careers WinAContract UK BidWriter UK GovCon — AI proposals eSourcing Data Privacy Terms Refunds

Services & network

Bid & capture consulting Registration & certifications GovCon training Supplier network Teaming & partnering Data & API Reports store

WinAContract is US-based and US-hosted — AI federal contract search and proposal writing software for US government contractors. Operated by eSourcing Data Ltd.

© 2026 eSourcing Data Ltd · info@winacontract.com

NAICS 221310

Top contractors in NAICS 221310

The 99 contractors with tracked federal awards in NAICS 221310, totalling $191,240,359. Ranked by award value.

See live NAICS 221310 opportunities →All contractors

1WASHINGTON SUBURBAN SANITARY COMMISSION$69,054,3991 awards
2CITY OF OAK RIDGE$46,147,0931 awards
3CLEAR LAKE CITY WATER AUTHORITY$14,600,7521 awards
4NORTHEAST OHIO REGIONAL SEWER DISTRICT$12,377,0842 awards
5CITY OF COCOA$5,928,6441 awards
6ADVANTIX ENGINEERING CORP$3,102,8701 awards
7DEPARTMENT OF WATER RESOURCES OREGON$2,521,9102 awards
8COVENTINA WATER, LLC$2,257,3182 awards
9HENRY MILLER RECLAIMATION DISTRICT 2131$2,137,9821 awards
10WATER TREATMENT SERVICES INC.$2,045,8281 awards
11EVOQUA WATER TECHNOLOGIES LLC$1,830,4577 awards
12ENVIROH20 LLC$1,440,1652 awards
13PEARL PURITY WATER SOLUTION LLC$1,432,5911 awards
14THE WATER WORKS AND SEWER BOARD OF THE CITY OF ANNISTON, ALABAMA$1,304,0761 awards
15CITY OF NEWPORT NEWS$1,298,5351 awards
16AVIATE ENTERPRISES, INC.$1,234,3273 awards
17RLM GOVERNMENT SERVICES LLC$1,109,2621 awards
18CITY OF WELCH$1,052,8641 awards
19MARQUIS SOLUTIONS LLC$911,6241 awards
20DOFINE SPRINKLER REBUILDERS INC$855,1111 awards
21TOWN OF ALDERSON$840,9181 awards
22COLUMBIANA COUNTY$836,9542 awards
23COUNTY OF ERIE$784,3001 awards
24ARIES CONSTRUCTION CORPORATION$746,5341 awards
25CITY OF EL RENO$710,0001 awards
26GREEN AND SUSTAINABLE SERVICES, LLC$650,7201 awards
27EAST RANGE PARTNERS LLC$569,8821 awards
28KLENZOID INC$525,4571 awards
29CUNA SUPPLY LLC$521,7162 awards
30PARAMOUNT CONSTRUCTION GROUP, LLC$509,8632 awards
31DAKS ENTERPRISES, LIMITED$506,0332 awards
32NALCO COMPANY LLC$492,9732 awards
33T-L IRRIGATION CO.$465,0331 awards
34MARVEL WATER LLC$440,1061 awards
35ROSS COUNTY WATER COMPANY, INC.$438,2781 awards
36CITY OF DALLAS$399,9061 awards
37ETAG CORPORATION$373,6351 awards
38COASTLINE LTD.$369,3531 awards
39QUALITY WATER SERVICES LLC$353,8871 awards
40VERDA MEDICAL SYSTEMS, LLC$349,5631 awards
41JACOBS PROJECT MANAGEMENT CO$335,1751 awards
42SENTINEL SERVICES, LLC$326,2551 awards
43PAULA F PRICE ENTERPRISES LLC$286,8481 awards
44J.P. SEWOROOTOR, INC.$264,2311 awards
45WCA CONSTRUCTION, LLC$254,8481 awards
46HYDRO SERVICE & SUPPLIES, INC.$247,3481 awards
47J3 ENTERPRISE LLC$241,7681 awards
48TOWN OF EMMITSBURG$238,0501 awards
49LIQUITECH, INC$229,9411 awards
50AMERI SERV WATER TECHNOLOGY, LLC$223,3181 awards
51MCHENRY, LUKE$213,4641 awards
52CITY AND COUNTY OF SAN FRANCISCO$207,2581 awards
53PHIGENICS LLC$205,4842 awards
54PHILADELPHIA WATER DEPARTMENT$190,0001 awards
55GULFPORT, CITY OF$187,3381 awards
56ENVIRONMENTAL QUALITY, INC.$179,0492 awards
57CALHOUN & DEJONG INC$173,5531 awards
58UTILITY SERVICES, INC.$168,4481 awards
59MECX, INC.$165,3001 awards
60R & M GOVERNMENT SERVICES INC$155,5001 awards