Any person, firm or corporation desiring to engage in or practice the art or trade of arborist, as defined in § 2-19-1, shall obtain a license to engage or practice from the director of environmental management. The director is authorized to grant licenses to practice that art or trade and require that the applicant for the license pass an examination showing fitness to engage in that art or trade, and the director shall charge a fee as determined by regulation as authorized in § 2-10-3.1. This fee shall not exceed twenty-five dollars ($25.00).