Even though CNN is making this into “news”, this isn’t a new concern / problem / fact.
I know of one local pharm company that will destroy some substances by rinsing it down a floor drain. Yes, its a method approved by whatever governing body, because apparently its fairly inert and super dilluted (beyond the point of possibly doing damage).
Friday evening I disposed of ~a qt each of CLR, por 15, PB blast, WD40 & naval jelly into your tap water, Fry. :fyi: