Iowa Code § 105.22: Grounds for denial, revocation, or suspension of license.

A license to practice as a contractor or as a plumbing, mechanical, HVAC-refrigeration, sheet metal, or hydronic professional may be revoked or suspended, or an application for licensure may be denied pursuant to procedures established pursuant to chapter 272C by the board, or the licensee may be otherwise disciplined in accordance with that chapter, when the licensee commits any of the following acts or offenses:

1. Fraud in procuring a license.

2. Professional incompetence.

3. Knowingly making misleading, deceptive, untrue, or fraudulent misrepresentations in the practice of the profession or engaging in unethical conduct or practice harmful or detrimental to the public. Proof of actual injury need not be established.

4. Fraud in representations as to skill or ability.

5. Use of untruthful or improbable statements in advertisements.

6. Willful or repeated violations of this chapter.

7. Aiding and abetting a person who is not licensed pursuant to this chapter in that person’s pursuit of an unauthorized and unlicensed plumbing, mechanical, HVAC, refrigeration, sheet metal, or hydronic professional practice.

8. Failure to meet the commonly accepted standards of professional competence.

9. Any other such grounds as established by rule by the board.