Latex paint can be disposed of properly by taking the lid off the container and letting it air dry. Set the paint can beside your regular trash for pickup. Leave the lid off so your waste hauler can see the paint is dry.
Optional: Add cat litter or sawdust to the remaining paint to speed up the process. The paint will dry completely in a day or two using this method.
Latex paint is also accepted for recycling at Tox-Away events. Fees apply.