Humans are 50% to 65% water. Animals that occupy the top of a food chain or pyramid are inherently more susceptible to water pollution in the sense that pollutants at the most basic level of the pyramid end up in concetrated fashion at the top (e.g., plankton concentrate toxins in their bodies, small fish eat the plankton and further concentrate the toxins, larger fish eat the smaller fish with a further concentration of toxins, ad absurdum until it hits your dinner plate.).
Just another gov't spinmaster. Gotta love them (not).
v/r, N-A