Dried out Latex Paint (water-based) is an acceptable item for curbside trash.  To solidify follow these simple instructions:

DO...

• Mix absorbent material (i.e. cat litter, sawdust, shredded newspaper) into paint and allow mixture to dry thoroughly.  Use a 50/50 mixture to ensure the quickest dry time; or
• Let the paint dry out.  Simply remove the lid and sit the paint can in a well-ventilated area (this works best for small quantities of paint); or
• Pour thin layers (about 1" of paint) into a disposable pie plate or cardboard box lined with plastic and allow the paint to dray one layer at a time.  Repeat the process until all the paint is dry.
• Once paint is dry, leave the lid off the can and place in your regular trash.
• Recycle the steel cans!  Place dried paint in box or plastic grocery bag to throw it out.