Okay, I have to disagree with most people in this thread. I am not a Chemistry or Environmental Engineering guy, but in my opinion your best bet is Stanford, PhD or Masters. If you are looking to do a PhD, given the current competition in PhD programs, a Stanford PhD will definitely give you a big advantage. Plus, Stanford is notorious for having very difficult PhD qualifying exams(procedures), especially in Engineering, which adds to their PhD prestige.
If you prefer the industry route after a quick Masters degree, Stanford is the obvious choice.