Waste, regardless of origin, that might normally be disposed of in a non-secure manner, such as at a sanitary landfill site, if not incinerated. The EPA defines solid waste as any garbage or refuse, sludge from a wastewater treatment plant, water supply treatment plant, or air pollution control facility and other discarded material, including solid, liquid, semi-solid, or contained gaseous material resulting from industrial, commercial, mining, and agricultural operations, and from community activities.