No public record other than office files and memoranda of any local government agency shall be destroyed until it is six years old or until the six-year retention is reduced by the local records committee for records that are shown by the requesting agency that a six-year retention is both unnecessary and uneconomical or that a lesser federal retention guideline has been established; or until the record has been authorized for microfilming or for conversion to any other document imaging system approved by the state archivist.

Except as otherwise provided by law, no public record, including office files and memoranda, shall be destroyed until approved for destruction by the local records committee. Reference chapter 40.14 RCW.