I see you’ve heard of my friend Flint

The two bad ones are interchangeable depending on badness. I know someone who lived next to a junkyard and had to emergently switch from well to town water because chemicals from the junkyard were leeching into his well. Funny enough two members of his household eventually got cancer too. Similarly, one of the only cases of tularemia in VT in recent history was from a muskrat dying in someone’s well.