They might also have environmental implications if they make it through sewage treatment facilities into waterways. (scientificamerican.com)
But besides failing to remove all drugs from wastewater, sewage treatment facilities using chlorine may have the unintended consequences of encouraging the formation of other antibiotics in the discharged water. (sciencedaily.com)
In countries without sewage treatment facilities, untreated sewage is released into coastal waters. (waterencyclopedia.com)