Welcome to DER & Associates

Welcome to DER & Associates Professional Investigations, a Waverly, Iowa private investigator firm also serving the cities of Waterloo, Decorah, Mason City and Dubuque.

Firm president and owner Darwin E Rittgers is a 20-year veteran of the Waverly police force who has been in business as a private investigator for over 11 years. He is licensed throughout the state of Iowa, and only hires other licensed private investigators to assist him in his practice. 

As a client of DER & Associates, you can be assured of hiring true professionals.

Darwin E. Rittgers and his associates take very seriously the confidential nature of their business. They help employers, insurance companies, attorneys, lenders, and private individuals with matters such as:

As a former police officer and detective, Darwin E. Rittgers knows how important patience, commitment, and persistence are to successful investigative work. He has benefited many times from the skills and training he received as a police officer by pursuing justice in the most efficient manner while getting the results needed to close the case.

The answers aren’t always easy to find, and they aren’t always what you hoped for or expected. But no matter what the outcome, clients of DER & Associates know they got the best investigative service available in the Northeast Iowa area.

If you need experienced, licensed investigators to find answers to your difficult problem, call DER & Associates today, toll-free at 1-800-413-6551.