California Code, Government Code - GOV § 27330

On or before January 1, 1968, notices of liens for internal revenue taxes payable to the United States and certificates of release, discharge, subordination or nonattachment of such liens shall be filed in the office of the county recorder of the county within which the property subject to the lien is situated.  On or after January 2, 1968, such notices and certificates shall be filed in the manner specified in Chapter 14 (commencing with Section 7200) of Division 7 of Title 1 of this code.

Certificates of redemption issued by the United States pursuant to the Federal Tax Lien Act of 1966 shall be recorded in the office of the county recorder of the county within which the property is situated.

Any of the documents referred to in this section and including a release of right of redemption issued by the United States may be filed or recorded without acknowledgment or further proof.