This sounds like kind of a pain if you have a quantity, Ronnie, but here's the scoop from the Metro Website:
http://www.louisvilleky.gov/solidwaste/ ... erials.htmPAINT DISPOSAL
While oil based paint or lead paint must be taken to HAZ BIN for disposal, water-based or latex paint is not a hazardous waste, and is not accepted at HAZ BIN. However, it can not be included with household garbage in liquid form.
If there is only a small quantity of paint in the can, remove the lid and let stand in a well-ventilated area away from children or pets until dry. For larger quantities of paint, or to speed up the drying process, stir in an absorbent such as sand, kitty litter, sawdust, vermiculite, or shredded paper.
Containers with dried latex paint (without lids) can be placed in tightly sealed plastic bags and placed in garbage containers for pickup.