A unit of county government shall enforce § 9–2203 of this subtitle. Subject to subsection (c) of this section, a county may impose a penalty not exceeding $250 on: A person who violates § 9–2203(a) of this subtitle; or A food service business that violates § 9–2203(b) of this subtitle. A penalty may not be imposed under this section unless: The unit of county government first issues a written notice of violation to the person or the food service business; and The violation is not corrected within 3 months of receipt of the written notice. A unit of county government shall notify the Department of any violation of § 9–2203 of this subtitle.