When I lived in Ca. I just poured it into an oil jug with waste oil in it and took it to AutoZone. As I recall they stated it was legal to pour antifreeze down the toilet, but I refused to do that! That's BS!
Where I live now, if I have extra oil I take to O'Riley's and I use alot for my burn piles every year, something you don't get to do! Antifreeze I take to the dump and they deal with hazardous waste. I can take 5 gallon per day.
When I had a body shop the hazardous waste disposal service would analyze the waste at some point and if it had so much of a % other than paint and thinner waste they would fine me, or sur charge, what ever you wish to call it. The same goes for oil waste, if it had so much of a % of antifreeze or brake fluid or "Other" they would fine, or sur charge me.