The Grand Canyon is one of the world’s most famous waterways, and its stretch of the Colorado River and its tributaries are protected. But a new study has discovered that some of the canyon’s water systems may contain pharmaceutical drugs and forever chemicals. … Monument Spring, which feeds into the Colorado River, showed traces of multiple pharmaceutical medications, including an antibiotic, antifungal, antidepressant, and a diabetic drug. The amounts are small, but experts say the findings indicate wastewater from a nearby treatment plant is somehow seeping back to the canyon and the Colorado River, a major water source for plants, animals, and humans in the region.