This stuff is poisonous and should never be dumped on the ground. Automotive antifreeze (including in RV engines) is made from Ethylene Glycol. This stuff is poisonous and should never be dumped on the ground. Automotive antifreeze (including in RV engines) is made from Ethylene Glycol.Click to see full answer. Furthermore, how do you dispose of RV antifreeze?Use 2 20 gallon storage tubs under the exhaust to catch the RV Antifreeze. No, you should not dispose antifreeze in any sort of sewer or nature. It is toxic and will impact the bacteria used in water purification or even worse, your local lake(s). It can also cause sever ground contamination.Also Know, is RV antifreeze hazardous? RV antifreeze is non-toxic and meant for pumping into the plumbing system. Automotive antifreeze is a whole different critter. Yes, ethanol is a good antifreeze (not in your bloodstream) because it raises the freezing point of water. That other antifreeze contender, propylene glycol, is also an alcohol of sorts. Herein, is it OK to put antifreeze down the drain? Do not pour your waste antifreeze down the drain. Animals may still have access to where the liquid flows through a storm drain and drink it because it smells and tastes sweet. It also should not be put in a septic system. Antifreeze contains glycol, which is toxic to humans and animals in certain doses.Will RV antifreeze kill plants?Antifreeze, also known as coolant, is commonly used in most vehicles to keep parts of the engine from freezing or overheating. If antifreeze leaks out of engines or storage containers or spills on grass, it is often toxic and can hinder lawn and plant growth or kill plants outright.