Stack Test Group
Stack Test Group
Stack Test Group


Stack Test Group… is committed to keeping the world’s air quality clean by providing our clients with superior technical expertise in air compliance and emissions solutions….


Stack Test Group was founded in 1996 by Bill Byczynski, President and Dr. Eric Aynsley.

Stack Test group first opened its doors in Aurora, Illinois. Bill attended US Military Academy and is a graduate of the University of Illinois. He had several years experience working for a competitor prior to starting his own air compliance testing business.

In 2003 Bill moved his business to Ottawa, Illinois. Stack Test Group headquarters is approximately 90 miles southwest of Chicago. The facility is approximately 8,000 square feet including a laboratory for sample analysis. Stack Test Group currently has a staff of 12 full time employees.

Stack Test Group’s strength is providing consistent, quality testing at competitive prices. we deliver on our promises. Every project is managed by a Stack Test Group Senior Staff Manager. This ensures our clients receive experienced knowledgable services, have direct and immediate access to the person responsible for their project and it enables us to consistently meet scheduling requirements and report deadlines.

The Stack Test group Sales Director and Office manager work closely with the project managers, technicians and clients for the proposals to the invoices. This process allows all the steps along the way to go smoothly. Stack Test Group prides itself on Team effort and team building.