This chapter is adopted to protect the health, safety and welfare of the citizens of the city and is necessary to provide standards of qualification for journey-level plumbers who perform work within the city. Plumbing work is complex and demanding and carries a high risk of harm to persons and property if performed improperly. This chapter does not regulate either plumbing contractors licensed under the Contractors' State License Law, Section 7000 et seq., of the Business and Professions Code or apprentice plumbers regulated under an apprenticeship program pursuant to Section 3070 et seq., of the Labor Code. (Ord. 2012-049 § 2)