All drains do lead to the ocean (or at least a river or lake). It's just that raw sewage isn't dumped directly into the water; there are a number of mechanical and chemical processes in the way that, if depicted in the movie, would probably not be pleasant. A deleted scene would have had Nemo going through and struggling to dodge the filtration machines, but it was cut out of the film with only a hint given that his small size allowed him to survive.

Film

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