Washington Revised Code Title 49. Labor Regulations § 49.100.030. Employee must provide notice of intent to take leave

(1) An employee who seeks leave under this chapter must provide the employer with notice of the employee's intention to take leave at least 30 days before a regular legislative session.

(2) When a special legislative session is called, the employee must provide notice to the employer as soon as the governor or legislature proclaims the special legislative session.