Cal. Pub. Util. Code § 13454

The petition shall declare that the public interest or necessity demands the creation of a special district for sewage disposal or solid waste resource recovery purposes within the area of the district described in the petition. The petition may be on separate papers, but each paper shall contain the affidavit of the party who circulated it, certifying that each name signed thereto is the true signature of the person whose name it purports to be.