Iowa Admin. Code r. 661-275.6
Complaints regarding the performance of any licensed contractor, failure of a licensed contractor to meet any of the requirements established in Iowa Code chapter 100C or this chapter or any other provision of law, or operation as a fire extinguishing system contractor without licensure may be filed with the department. Complaints should be as specific as possible and clearly identify the contractor against whom the complaint is filed. Complaints should be submitted in writing to the department as indicated on the department's website. A complaint may be submitted anonymously, but if the name and contact information of the complainant are provided, the complainant will be notified of the disposition of the complaint.
Iowa Admin. Code r. 661-275.6