Wash. Admin. Code § 296-126-092 : — Labor and Industries, Department of126 - Standards of labor for the protection of the safety, health and welfare of employees for all occupations subject to chapter 49.12 RCW —126-092 - Meal periods - Rest periods

(1) Employees shall be allowed a meal period of at least thirty minutes which commences no less than two hours nor more than five hours from the beginning of the shift. Meal periods shall be on the employer's time when the employee is required by the employer to remain on duty on the premises or at a prescribed work site in the interest of the employer.
(2) No employee shall be required to work more than five consecutive hours without a meal period.
(3) Employees working three or more hours longer than a normal work day shall be allowed at least one thirty-minute meal period prior to or during the overtime period.
(4) Employees shall be allowed a rest period of not less than ten minutes, on the employer's time, for each four hours of working time. Rest periods shall be scheduled as near as possible to the midpoint of the work period. No employee shall be required to work more than three hours without a rest period.
(5) Where the nature of the work allows employees to take intermittent rest periods equivalent to ten minutes for each 4 hours worked, scheduled rest periods are not required.

Wash. Admin. Code § 296-126-092

Order 76-15, § 296-126-092, filed 5/17/76.