Cal. Health and Safety Code - HSC § 19150. Section 19150.
Every building or structure and every portion thereof shall be designed and constructed to resist stresses produced by lateral forces as provided in the State Building Standards Code. In areas where the Division of Codes and Standards of the Department of Housing and Community Development is the enforcement agency, plumbing and electrical equipment and installations shall be subject to building standards published in the State Building Standards Code and the other rules and regulations adopted pursuant to Sections 17921 and 17922 of this code.