Used toner cartridges may be recycled or disposed of with normal trash. Many manufacturers and/or distributors of printing supplies will accept used toner cartridges for recycling. If you are unable to make this type of arrangement, then used cartridges can be disposed of via normal refuse collections. Unused toner cartridges must be treated as chemical waste and disposed of using the guidelines of the  Waste Disposal Procedures. Containers of this type must be labeled as hazardous waste, and a Chemical Collection Request Form must be submitted to Environmental Health and Safety.