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Updated 6/10/20:

All indications are that we're just at the beginning when it comes to understanding the presence and importance of pharmaceuticals in the environment, let alone what to do about them. Even as scientists investigate what's actually out there, pharmaceutical companies work to make drugs and drug production more environmentally benign, wastewater treatment professionals develop better ways to remove pharmaceuticals, and environmental and public health advocates work on campaigns to change practices, studies finding pharmaceuticals in the environment keep coming.
In fact, Kolpin says, hundreds are published each year. And although the amounts of pharmaceuticals being measured are exceptionally small, he says this information is important because it provides a base line for future comparison.
"What we think today is safe, we may find 10 years from now there is some effect, that we didn't realize at the time was important," he says. "We're not trying to say the sky is falling. We're trying to put out the science saying there are some things that are of concern."