Latex paint is not hazardous waste. Latex paints are water-based and are a safer substitute for oil-based paints. They can be placed in the trash after allowing to harden. Take the top off the pain can and place it outside, away from pets and children. Allow it to harden. If the can is very full, absorb the material by mixing it with sawdust, clay-based cat litter, or rags. Stir with a stick until all the paint is absorbed. When the paint is solidified, it can be placed in the trash leaving the lid off.