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The article implies that sewage treatment plants remove caffeine, but septic tanks do not. Since most sewage treatment plants don't do much more than let natural bacteria "process" the sewage (i.e., they do no chemical processing), it seems the caffeine can't be that hard to get rid of. On the other hand, it does does survive the trip from the septic tank through the ground to the ocean, so it must be somewhat persistent. I wonder if it naturally dissipates in the ocean, and if so, how long that would take?