Call the environmental protection agency in your state. Verify all regulations regarding the proper disposal of CCA-treated wood. The information will also be available on the state's EPA website.
Place the CCA-treated wood with household rubbish. Make sure that you don't mix the CCA-tread wood with yard waste. It is unlawful in many states to mix yard waste with CCA-treated wood.
Call your local landfill and inquire about its particular dumping information. Fill your truck with CCA-treated wood. Drive it to the landfill and dispose of the CCA-treated wood.