Our community has drug disposal days periodically where the police departments set up a place where people can bring all their drugs to be disposed of - no questions asked. All the pills are emptied into a huge trash bag and the bottles etc. are crushed. I'm not sure how they dispose of the drugs, but they don't end up in our water supply. It's a problem as it is because most of the drugs are excreted into the sewer supply from us taking them, so we don't need to have more of them flushed down the toilet. I'm not sure how much of those drugs make their way into our drinking water supply. A good water filter helps.
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