Well Kelly , personnally I dont drink out of the toilet, so.....who knows??

So Kelly , what Amervo says is a felony up there in Maryland, is not in Texas!

Copied from City of Houstons website (thx for looking up, Kel):

Reuse
If the antifreeze is unused and in good condition, try to find a neighbor, friend, or family member that could make good use of it.

Disposal
If you live in the City of Houston, used antifreeze can be disposed of by pouring into your toilet. The wastewater treatment plants will not be adversely affected by this. Both used and unused antifreeze can be disposed of by bringing it to the City of Houston's Consumer Recycling Center, located at 5815 SW Freeway, at Westpark. Please limit your load to 5-gallons. (You can also bring a lot of other recyclable items to this facility including used oil, latex paint, car batteries, paper, plastic, glass, aluminum, tin and phone books.)

So Dave , you might check w your locality? its evidently different in different places!
And as I think I remember, you work in one state ,live in the other...you may even have two different laws to contend with..?