Since our foundation in 1995, Engineering Design Source Inc. (EDSI) has completed more than 2,000 civil engineering and surveying projects in the    Bi-State area. EDSI has a team of 30+ engineers, surveyors, construction inspectors, and technicians working from our Chesterfield, Missouri headquarters and office in Collinsville, Illinois. Our staff includes 33% minorities/women. EDSI is a certified Minority Business Enterprise (MBE)/Disadvantaged Business Enterprise (DBE) and a member of the American Council of Engineering Companies (ACEC) in both Missouri and Illinois. We have worked with a variety of clients including Missouri Department of Transportation (MoDOT), Illinois Department of Transportation (IDOT), St. Louis County, City of St. Louis, St. Louis Lambert International Airport,  Metropolitan St. Louis Sewer District (MSD), Illinois America Water (ILAW), Ameren, University of Missouri-St.Louis, Missouri Botanical Garden,  and large architectural/ engineering firms throughout Missouri and Illinois.


    At EDSI, our mission is to provide our clients with the highest level of excellence in our engineering and surveying services. We deliver customer satisfaction by focusing on timeliness, paying attention to details, and producing quality work. We foster the highest standards of professionalism, cooperation, and enthusiasm in our relationships with our fellow staff members, clients, and subcontractors.


    Work Hard
    Take care of our clients
    Have Fun



    • Disadvantaged Business Enterprise (DBE)
    • Minority Business Enterprise (MBE)
    • Licensed Professional Engineering Corporation
    • Licensed Professional Land Surveying Corporation


    • Disadvantaged Business Enterprise (DBE)
    • Minority Business Enterprise (MBE)
    • Licensed Professional Engineering Design Firm
    • Licensed Professional Land Surveying Firm

    City of St. Louis

    • Licensed Business
    “Thank you for your input. We’ll include your comments with our eventual report back to Parsons on Aug. 29th. We appreciate you support and diligence. You are the only “I-64 Specialist Partner” that had the time and ambition to respond to our request. That is a credit to you and your work ethic. Thanks again for all you do.”
    David Henroid
    Project Manager | Missouri Department of Transportation (MoDOT)
    “Thanks, George for all the great work that EDSI has done over the last few years, for the City of Chesterfield. It was certainly enjoyable to spend time with you and the rest of your group at the ACEC Awards ceremony. The staff at City Hall will be happy to showcase the ACEC Award EDSI received for the Chesterfield Valley Athletic Complex expansion project. Again, many thanks!”
    John Nations
    Former Mayor | City of Chesterfield, MO
    “They are one of the small-to-midsize local consulting firms that has always provided a high-quality, cost-effective product for our projects. They have also teamed with larger nationwide firms, to design much larger and more complicated projects, such as the $2.7 million design of a sanitary relief tunnel along Deer Creek.”
    Brian Hoelscher
    PE | Executive Director | Metropolitan St. Louis Sewer District (MSD)
    “I wanted to thank you for all the work your team performed on the Taxiway D Reconstruction project. The schedule for this work created some significant challenges which your team handled very well. The survey team far exceeded my expectations regarding both the speed and accuracy of their work, which allowed the design team to move forward on our aggressive schedule. Your design team made a significant contribution to the overall work and was able to accomplish this work on an accelerated time schedule with minimal input from us. I look forward to working with you and your team again in the future.”
    Ty Sander
    PE | Sr. Project Manager | Crawford, Murphy & Tilly, Inc.
    “I just wanted to let you know that we had a conference call this morning with the USACE. While on the call, Bob Mesko had nothing but good things to say about EDSI, so you and your team must have impressed him very much. Thanks for making us all look good to the client.”
    Howard K. Davis
    GISP, CFM | Sr. Project Manager | PBS&J
    “EDSI staff were excellent to work with. Communication was always clear and timely. The plan set is top notch for the complexity of the project.”
    Kevin Kriete
    PE | Structural Department Manager | HDR
    “EDSI’s employees bring value to the team and exhibit the values that I-64 project leadership is looking for to make our project successful: be flexible, encourage risk & accept failure, empower employees, be safe, provide best value for the money spent, use teamwork, listen and seek to understand, seek out and welcome ideas that increase options, and strive to work better, faster & cheaper. EDSI meets expectations for this evaluation period.”
    Lesley Hoffarth
    PE | Former I-64 Design-Build Project Director | Missouri Department of Transportation (MoDOT)