Cal. Gov. Code § 43005.7
Notwithstanding any other provision of law to the contrary, the legislative body of a city which collects its own taxes may by ordinance waive any penalties and interest on the second half of taxes, unpaid and delinquent at 5 p.m. on April 12, 1965, on any property damaged in excess of five hundred dollars ($500) by storms and floods occurring between December 1, 1964, and January 30, 1965, in an area proclaimed by the Governor to be in a state of disaster. With respect to those penalties and interest, the waiver shall constitute a complete relinquishment of all legal claim thereto by the city.
Any ordinance adopted pursuant to this section shall waive all those penalties and interest on taxes due the city, effective at 5 p.m. on April 12, 1965, and for all time thereafter, but shall not operate to reduce any tax delinquent at that time.
Ca. Gov. Code § 43005.7