I would guess, if they were to do something, will be thru manufacturers of water treatment materials like floculants or chlorination. And local water treatment plants will be unaware of it when they use the products to treat drinking water. Is just a guess tho.
I would guess, if they were to do something, will be thru manufacturers of water treatment materials like floculants or chlorination. And local water treatment plants will be unaware of it when they use the products to treat drinking water. Is just a guess tho.