Originally Posted by Bikeman
believe it or not, when I called Douglas County a few years back, they said to flush the coolant down the toilet!
This was for a long time the recommended disposal in many places. Most waste water plants would tolerate and treat anti-freeze in diluted amounts. This is less ideal now because of the way the treatment plants work (antifreeze can cause problems with the biological treatment that is getting more common). So if your sewer company or city says not to do it, then don't. No matter if your waste water company can handle it or not, anti-freeze should NEVER be dumped into storm sewers, just septic treatment systems might be OK.