That is an excellent question! In a field where people are born into it or fall into it, why would anyone want to deal with industrial water treatment?
Check out this links to learn more about what can be an exceptionally rewarding career:
Like Seeing How Things Are Made and Going Behind the Scenes? Consider a Water Treatment Career
Wikipedia: Industrial Water Treatment
Association of Water Technologies (AWT) created the Student Education and Enhancement Development (SEED) Program
AWT: Why Would You Recommend the Water Treatment Industry
AWT: Careers in the Water Treatment Industry
AWT: Why You Should Consider a Career in Water Treatment
AWT: A Day in the Life of an AWT Member
AIChE: Consider a Career in the Water Industry