Its ok to rinse my paint supplies out in the gutter, right?
No. It is not OK. Read the paint can label; if it is “latex” paint you can wash the paint equipment in a sink that is plumbed to sanitary sewer. Any sink in your house should do. If it is a “oil-based” paint do not wash equipment in the sink! Oil based paint equipment can be cleaned using solvents and thinners. Dispose of oil-based paints, solvents and thinners at a household hazardous waste event.