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About what makes CT Laboratories different...

Experience cannot be overlooked. CT Laboratories LLC has been in business since 1987.  We are located in the heart of the Baraboo Bluffs in Baraboo, WI.  The lab was started back in the eighties as an off-shoot of the engineering firm Mid-States Associates.  Today, we are locally owned and continue to grow.  We are always increasing our capabilities and the locations we serve.

CT Laboratories' staff is comprised of dedicated, long-term employees. Key personnel, including our Laboratory Director, Project Managers, Group Leaders and Senior Analysts have an average tenure of over 12 years with the company. We also understand that communication is the key to a successful project. Our clients are assigned a specific project manager to take care of their needs from initial project scoping and assistance with QAPP generation, to fulfilling bottle requests and verifying sample receipt through addressing technical issues and final report generation.

Quality is not a given or an afterthought at CT Laboratories. Our quality assurance program is designed to ensure legally defensible data. From numerous performance evaluation studies, NELAP and other individual State audits, as well as our in-house program, we continually monitor our quality to ensure our clients get the best results possible.



As a Small Business, many of our personnel take on more than one responsibility. We are extremely proud of our team and the expertise they bring to the laboratory. 



President & Owner

Pan American Business School, 1977

Time at CT Laboratories: 19 years

Ms. Berwanger has over 35 years of experience in the environmental laboratory industry, in a variety of financial, technical, regulatory, marketing, project management, sales and managerial positions. Her expertise includes a thorough knowledge of Federal contracting requirements and business management aspects of the laboratory.

Learn more about our Woman-Owned Small Business Designation:


Brett Szymanski

Laboratory Director / Project Manager

BA in Management & Human Resources

Time at CT Laboratories: 14 years

Areas of Expertise:


Dennis Linley

Business Development / Marketing

BS in Wildlife Biology

Time at CT Laboratories: 26 years

Areas of Expertise:

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Heidi Beckel

Wet Chemistry & Microbiology Group Leader

BS in Microbiology

Time at CT Laboratories: 3 years

Areas of Expertise:

  • Microbiology sample preparation and analysis. 

  • Wet Chemistry sample preparation and analysis. 

  • Troubleshooting and optimizing instrumentation. 

  • Team management & leadership.


David Berwanger

VP of Operations / Information Systems Manager

AS/BS in Chemistry

Time at CT Laboratories: 23 years

Areas of Expertise:

  • Analytical laboratory instrumentation.

  • Productivity/cost consulting.

  • Environmental laboratory management.

  • Laboratory network and instrumentation software.


Jodi Serstad

Project Manager

Time at CT Laboratories: 20 years

Areas of Expertise


Adam Zurfluh

Semivolatiles & Extractions Group Leader

BS in Wildlife Biology

Time at CT Laboratories: 9 years

Areas of Expertise:

  • Semivolatile Organics Analysis including PCBs, Pesticides, and Explosives. 

  • Extraction of Semivolatile Organic Compounds from difficult matrices.

  • Instrumentation & Maintenance - GC and HPLC

  • Team management & leadership


Rebecca Duranceau

Quality Assurance Manager / Technical Director

BS/MS in Chemistry/Medicinal Chemistry

Time at CT Laboratories: 15 years

Areas of Expertise:


Erik Catherman

Sample Receiving / Facilities Manager

Time at CT Laboratories: 2 years

Areas of Expertise: 

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Debbie Watts

Administrative Assistant 

Time at CT Laboratories: 15 years

Areas of Expertise:

  • Accounts Receivable

  • Human Resources / Payroll 

  • Client Relationships

  • Create and Maintain Physical and Electronic Filing Systems


Eric Korthals

Senior Project Manager / Deputy Technical Director

BS/MS in Aquatic Biology/Chemistry

Time at CT Laboratories: 31 years

Areas of Expertise:

  • Project Management in all areas of CT Laboratories involvement.

  • Laboratory Information Management Systems (LIMS) administration and development. 

  • Electronic Data Deliverables (EDDs) development and generation. 


Randy Digmann

Volatiles & Metals Group Leader

BS in Water Chemistry

Time at CT Laboratories: 32 years

Areas of Expertise:

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