PURE WATER IS PERFECTLY CLEAR, OF COURSE

Seawater and streamwater are not pure water.

Pure water is clear, not blue.

That may be true but seawater is only blue because it is reflecting the light of the sky.

Thank you OP. Good to know that NASA's 17 billion dollar budget is hard at work.

On a related topic (related to the board, not the thread), the school I am going to this fall doesn't have an active anime club. I intend to transfer after one semester. Am I pathetic, /anime/?

Are you transferring just to get an anime club?  Then it's not like you liked the school that much anyway.  Lots of people transfer and change majors and shit.  Sounds pretty average to me - not much confidence in your major, looking for a change.

YOU MADE ME RAGE OP

Not true.  Pure water is not perfectly clear.  It scatters bluer light more than redder light, meaning that it will always appear blue to some extent (related to the depth of water you're looking at).
And, under bright light of certain frequencies (including sunlight), it fluoresces slightly green.  (Quadrupole emission, for those who know any chem/physics.)

So yes, all those shows you've watched and comics you've read in which they made the ocean water appear blue were correct.