California Code, Public Utilities Code - PUC § 13453

Instead of procedure by resolutions, a petition may be filed with the secretary of a district signed by voters within the proposed special district equal in number to at least 10 percent of the total vote cast. The boundaries of the proposed special district shall be described in the petition and shall include at least two public agencies or portions thereof. A statement of the name of any public agency constitutes a sufficient and legal description of the territory thereof if the entire area of the agency is included.