Cal. Rev. & Tax. Code § 2189.8
Upon application, the county tax collector may issue tax clearance certificates. Those certificates shall be used to permit registration of used floating homes, as defined in Section 18075.6 of the Health and Safety Code, and for any other purposes as may be prescribed by the Controller. The certificates may indicate that the county tax collector finds that no local property tax is due or is likely to become due, or that any applicable local property taxes have been paid or are to be paid in a manner not requiring the withholding of registration or the transfer of registration. The certificates shall be in any form which the Controller may prescribe, and shall be executed, issued, and accepted for clearance of registration or permit issuance on any conditions which the Controller may prescribe.
Ca. Rev. and Tax. Code § 2189.8