The Environmental Protection Agency (EPA) of US had accidentally spilled three million gallons of wastewater from an abandoned mine last week on 5 August. The spill happened when EPA workers were cleaning up the closed Gold King Mine, who accidentally diverted the toxic water into a tributary of the Animas River.
It turned the Colorado River mustard yellow.
The EPA claims that wildlife is not in danger because the sludge moved quickly downstream. However, local authorities took immediate steps to protect drinking water supplies and farms by closing the Animas River. People were advised to stay out of the water.