Any person violating sections 18-1901 to 18-1913 or any lawful ordinance or rules and regulations authorized by such sections shall be guilty of a misdemeanor, and shall be fined not more than five hundred dollars nor less than fifty dollars for each and every violation thereof. If such person holds a plumber's license, he or she shall forfeit the same, and it shall be void, and he or she shall not be entitled to another plumber's license for one year after such forfeiture is declared against him or her by the plumbing board.