Official State of Iowa Website Here is how you know
Iowa Department of Human Rights

For Interpreters

What Laws Require an Interpreter?

What Credentials Must an Interpreter Have?

For working in a legal setting: Iowa State Requirements

Interpreter Setting: http://www.iowacourts.gov/administration/directories/ADA_Access/

Licensed by the State of Iowa: Iowa Department of Public Health Licensure

Certification

Samples of licenses, certification, and membership cards: Download PDF.