Gglycol must break down a lot faster than whatever they put in prescription drugs!
I am assuming you all are aware of the media news a few weeks ago about finding trace amounts of a whole bunch of different script drugs in water supplies in the U.S.
Male fish are starting to mutate with female traits due to birth control pills.
Apparently most of this is from urinating what didn't get absorbed by the body.
And then it makes it all the way through the filtration process to the tap (on city water...(hi Ed!)) where we drink it and cook with it.
It is said that reverse osmosis is the only way to clean the water, and that is much more expensive than the current methods.
It has made me wary of what I pour down the drain anymore.
Our efforts at recycling may just be a hopeless dream. Think of all the mercury in those compact flourescent bulbs that the U.S. Federal gov't are going to be shoving down our throats in a few years. Do you really think the average "american" cares about what they throw in the trash can? Living with my sister & bro-in-law was a real trial in this respect. I cannot throw out stuff than is accepted at a recycling center. They have no global consciousness.

Oh, and a decent water sample test probably costs a few hundred dollars. About 10 years ago they were priced at (IIRC) about $50 for a test for stuff that you can see, and I think it was $200 for the comprehensive test.
I didn't get the expensive one. I am still alive...