Every single medication that someone takes goes back into the supply via their waste, and is then fed back out to everyone else like a chemical stew.

You are correct - if it ain’t tested for - we have no reason to specifically filter for it.

https://www.health.harvard.edu/newsletter_article/drugs-in-the-water

I am just glad I live far enough away on a well to be unaffected. Glad your map reflects that.