Any person found to be violating any provision of Article III of this chapter shall be served by the city with written notice stating the nature of the violation and providing a reasonable time limit for the satisfactory correction thereof. The offender shall, within the period of time stated in the notice, permanently cease all violations. The notice requirements of this section may be waived by the Public Works Director if, in the Public Works Director’s opinion, the violation constitutes an imminent threat to human health, safety, or the environment, or to the proper operation of the wastewater facilities or is a violation of federal or state law.