Businesses must comply with both state and federal ovetime laws. Although most jobs require overtime pay, there are several exceptions. Salaried executivie, administrative, professional, computer-related and outside sales employees are typically exempt from overtime requriements. However there are notable exceptions. For instance, a "white-collar" salaried employee, under Federal law, must make $455 per week to be exempt. "Blue-collar" workers are not exempt and must be paid overtime under both state and federal rules.
Follow the link to the Washington Labor and Instustries' website for more information.