In dystopia or not utopia, you might find polluted lakes and rivers.

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Generally speaking, that is correct.  A dystopia is the opposite of a utopia, and is a place which we define as unpleasant or bad.  Therefore, what you might find in a dystopia is what you would consider as being unpleasant or bad.  Hence, if you think polluted lakes and rivers are unpleasant, then they are likely to be part of a dystopia "for you".  However, each person's dystopia may be different, as it depends on personal preference, or in this case, personal disgust.

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