Washington Revised Code Title 42. Public Officers and Agencies § 42.52.540. Limitations period

Any action taken under this chapter must be commenced within five years from the date of the violation. However, if it is shown that the violation was not discovered because of concealment by the person charged, then the action must be commenced within two years from the date the violation was discovered or reasonably should have been discovered: (1) By any person with direct or indirect supervisory responsibilities over the person who allegedly committed the violation; or (2) if no person has direct or indirect supervisory authority over the person who committed the violation, by the appropriate ethics board.