Find resources for about treated wood waste (TWW) specific regulations for households, contractors, businesses, haulers, generators, and landfills at www.TWWDisposal.org. Included are fact sheets and outreach materials on the appropriate handing, disposal, and other management of TWW to facilities that may receive or handle treated wood waste.

Pressure treated, preserved wood, or treated wood waste (including the sawdust), referred to as TWW, has preserving chemicals like arsenic. Common uses of TWW are fence posts, sill plates, landscape timbers, pilings, guardrails, decking, and railroad ties.

Painted, engineered, stained, laquered, plywood/composite, and wood painted with "copper green" wood may go in the garbage. Click on the TWW Material Fact Sheet for more information.