Never do it. Cities around Puget Sound don't have the treatment capacity to filter this stuff out, especially pharmaceuticals and drugs. They are showing up in alarming numbers in local fish and sealife now.
We do have the ability to remove many things but those drugs could just as easily have passed through a human and been deposited conventionally. Not the issue here but perhaps stop taking pharmaceuticals and drugs! I’m having a hard time putting this into words. The drugs are going to make it into the sewer or septic, can’t stop it so long as people are eating them.