Prompt, Professional Substance Abuse Assessment Evaluation & Referral


Assessment Services Inc. was the first private evaluation agency to be located in the beautiul Court Avenue Business Suites. Our large,open, loft style office space provides a welcoming and private setting for your appointment. In March of 2013, our office expanded to give clients a dedicated, private entrance and increased classroom capacity. We are now located on the west side of the 2nd Floor Skywalk. Our main entrance is located on the north side of the Skywalk right before the Plaza Sykbridge.

Our offices are located in the historic Court Avenue District, downtown Des Moines, Iowa for your convenience. In addition, for a nominal fee,  ASI staff are able to travel anywhere in the State of Iowa to provide evaluation services to those unable to visit our offices due to health, disability, or incarceration.


ASI Des Moines Office

309 Court Avenue Suite 242

Des Moines IA 50309

For a link to a map of this location, click here:

Our convenient downtown location is located just minutes from the Polk County Courthouse. Located in the Court Avenue Business Suites, our upscale and professional office provides comfortable surroundings and convenience.

PLEASE NOTE: We are an independent agency and NOT affiliated with any other evaluation provider in the Court Avenue Business Suites. Krista M. Mattson is the only certified and licensed practitioner providing evaluations in our office.



Same Day Appointment (515) 875-4894 Habla Espanol
  • OWI/Substance Abuse Evaluations
  • 12 Hour Drinking Drivers Education Program
  • OWI 1st Offense Weekend Program
  • OWI 2nd Offense Weekend Program
  • 24-Hour Continuous Alcohol Monitoring (SCRAM)
  • We accept visa and mastercard