Final answer:
Violations of engineering professional conduct are to be reported to the state's Board of Registration, which enforces professional standards and conduct for licensed engineers.
Step-by-step explanation:
Violations of the Rules of Professional Conduct for engineers should be reported to the Board of Registration in the state in which the violation occurred.
This board is typically responsible for the licensure of engineers and has the authority to enforce professional standards and conduct within the jurisdiction of the state. While professional engineering associations such as the American Society of Civil Engineers (ASCE) and other similar bodies play a significant role in developing and promoting ethical standards, the enforcement of conduct is a legal matter handled by the appropriate registration board.