Annual Household Hazardous Waste Day at Clean Harbors Clean Harbors will hold its free household hazardous waste collection Saturday, May 17, 2025, for residents of El Dorado and Union County. The drive-up service is offered the third Saturday of every month, April through September, at the Clean Harbors facility, located at 309 American Circle between 8 a.m. and noon on collection days. All hazardous waste should be in a sturdy, non-returnable container, as pouring off will not be offered. Residents should make sure the waste can be easily removed from the vehicle to avoid any accidental spills.