Our History.

Homer and Edward ChastainHomer and Edward Chastain (left to right)
Chastain & Associates was founded in the spring of 1954 by brothers, Homer and Edward Chastain. After being awarded a 909,000 square foot expansion project for Caterpillar's existing facility in Decatur, the brothers mortgaged everything they owned to meet the increased payroll and staffing demands of the project. Over the years, we have completed numerous projects for Caterpillar, and are proud to have them as a friend today. Chastain is headquartered in Decatur, Illinois.

In September 1954, the brothers were also involved in the early development of the Illinois State Toll Highway, formerly known as the Northern Illinois Toll Highway. Chastain was among several firms supporting Joseph K. Knoerle & Associates, Inc. of Chicago, Illinois in the preparation of the final feasibility report and construction cost to develop 481 lane miles of the proposed highway. To-date, Chastain has completed over 75 projects for the Illinois Tollway and maintains a strong relationship with the agency through open communication. Read more...

Our Leaders.

Click on the names to view their bio.

Our Diversity.

Our Culture.

At Chastain, we believe teamwork matters.  Not only is is apparent in the services we offer our clients, but how we treat one another.  Our clients and staff flourishes with our outward mindset!  This means we genuinely see (and hear and listen to) others.  We evaluate their needs, objectives and challenges rather than focusing on our own.  When we do this, options occur to us that never could have before and we can focus on the collective result we desire.

Professional Growth.

Chastain maintains and develops the highest level of expertise and professionalism through the promotion and encouragement of continuing education, seminars, and educational programs.  As such, Chastain maintains a 24/7 online university where staff has access to accredited courses to help maintain and develop their skill set.

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At Chastain, I value the opportunity to try out different types of projects.  It has helped me to become a more well-rounded engineer and discover the type of project that I enjoy the most.  I also value the openness of management in the company.  It is okay if we don't have all the answers and we can find the solution together as a group.  Chastain also provide flexibility in work schedule and accommodates our family needs.
- Janice P., Project Manager - Schaumburg

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​I have been with Chastain for going on the three months and I can honestly say I love my job.  Chastain does an amazing job of creating a welcoming atmosphere.  Everyone is open to answering any questions, if they don't know an answer, they will show you how to find it!  Overall, Chastain is a welcoming company with a great work-family balance!
- Mackenzie H., Engineer - Paducah

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 Working at Chastain has been very rewarding, challenging and flat out fun.  They offer a very flexible working environment (half day Fridays) as well as being family-friendly and understanding when things do come up.  The projects are very diverse and they are always open to employees who want to spread their wings and wear many hats on a project.  My co-workers are very genuine and are always available to lend a helping hand on project related issues.
- Matt T., AutoCAD Designer - Rockford

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For me, the most important thing has been their willingness to be flexible with not only my hours, but the location where I do my work.  I was provided with all the necessary equipment to work from home during the pandemic, which allowed me to be there for my kids while homeschooling.  Overall, Chastain is a great company.  We are consistently being offered opportunities to be our best selves.
- Tamara P., Project Coordinator - Lafayette

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I enjoy the flexibility of work hours and time off, being able to work on different types of projects, and additional engineering knowledge throughout the company to discuss problems with and figure out solutions.
- Troy T., Survey Crew Chief - Paris

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I like working at Chastain because of the diversity of the projects and parts of projects I get to work on. As a young engineer, it’s been very helpful to me to see so many different aspects of a project and how they all work together. In the office, I’ve worked on water and sewer projects, local roads, bridge replacements, hydraulic modeling, MFT programs, and countless others. Out of the office, I’ve done surveying and construction observation which have helped me see how the plans get from the paper to the ground. Chastain has showed me how much more there is to civil engineering outside of what they teach you in school.
- Luke K., Engineer - Decatur

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