Best to take old paint to the local recycling center for safe and legal disposal.
Painters in Kansas City - whether DIY painters or pro's - all have the same challenge at the end of a job: how to get rid of old or leftover paint. There are the environmentally responsible options and then the legally questionable options. Let's take a look at both.
A certain environmental agency may construe your donation to be disposal and suddenly your kind gesture is seen as dumping rather than donation
It's never a bad idea to hang on to a small amount of your current paint color. Just an easy and quick way to cover dents and dings from everyday usage. But any quantities beyond a gallon or two present a problem. You can keep it in your basement, yes - but sooner or later you'll have to deal with it. Sooner is always better.
The best way to dispose of old paint is to take the paint to a city or county recycling center. Whether oil or latex paint, stain, varnish, etc., you'll avoid any legal liability or environmental consequences. After that, you're looking at the Less Than Ideal Solutions.
Whatever you do, don't dispose of old paint down the drain, in a vacant lot or anywhere else that you know just isn't right. If you get cought at the time you'll be in a big pile of trouble. If it is traced back to you after the fact you'll be on the evening news.