Mattress Stewardship Program established; report; civil penalties. Establishes the Mattress Stewardship Program that allows certain industry associations to administer the Program as a mattress recycling organization with approval and certification from the Department of Environmental Quality. The bill requires certain producers, retailers, and renovators of mattresses to register with a certified mattress recycling organization and requires a producer to identify each mattress brand it sells or offers for sale in the Commonwealth on or before June 1, 2027. Prior to the Program going into effect, the bill requires a mattress recycling organization to submit a plan with certain criteria relating to the collection and recycling of mattresses and the implementation of the Program. The bill establishes annual reporting requirements for the mattress recycling organization and establishes a Mattress Stewardship Program Advisory Board to provide advice on the proper implementation and sustainability of the Program. Finally, the bill establishes the powers and duties of the Department as they relate to the bill and civil penalties for violations of the Program by the producers, the retailers, or the mattress recycling organization.