Paint, primer and stains contain chemicals and compounds that should be properly disposed of. Never wash brushes and supplies or dump paint down to storm water drain or in your kitchen sink.
You may call your local paint disposal or recycle center if you have leftover paint you don't need.
When you are done painting, squeeze all paint from your brushes in a tray or bucket. Rinse your brushes in warm water in the utility sink (not your kitchen sink).
Leave paint cans in the sun to completely dry and then dispose of the cans.
Let disposable rollers and brushes dry completely before disposing.