The bill establishes new protections for workers facing employment loss due to business closures or mass layoffs in Washington State. It introduces definitions for key terms such as "affected employee," "aggrieved employee," "business closing," and "mass layoff," among others. Employers are required to provide written notice to both the affected employees and the state’s employment security department at least 60 days prior to a business closing or mass layoff. The notice must include specific details about the closure or layoff, including the expected date of employment loss and the job titles of affected positions. Exceptions to the notice requirement are outlined, including situations involving unforeseen business circumstances or natural disasters.

Additionally, the bill imposes penalties on employers who fail to provide the required notice, including civil penalties of up to $500 per day for each day of violation. Employers are also liable for back pay and benefits to aggrieved employees who suffer employment loss due to non-compliance. The legislation mandates that the employment security department administer and enforce these provisions, and it allows for civil actions to be brought by aggrieved employees or their representatives. The act is officially titled the "Securing Timely Notification and Benefits for Laid-off Employees Act" and constitutes a new chapter in Title 49 of the Revised Code of Washington.