Tannery industries in Mojo town, Ethiopia, are polluting the Mojo River with their wastewater. The researchers collected samples from tanneries, river water, and sediments to analyze their chemical properties. They found high levels of pollutants like chromium, ammonia, and sulfide in the wastewater, exceeding safety limits. The tannery effluents are directly harming the river's water quality. The study suggests that tanneries should treat their wastewater before releasing it to protect the aquatic environment.