You are here: Home News and Events Allegheny River Turns Purple Allegheny River Turns Purple The Allegheny River turned purple Wednesday morning after a chemical was accidentally released into the river. by Heather Carr January 19, 2012, 2:00 am Part of the Allegheny River turned purple Wednesday morning after a chemical was accidentally released into the river. The chemical is used to remove iron and manganese from drinking water. It turned the Allegheny River purple after Pittsburgh Water and Sewer Authority employees disposed of the chemical in a sewer. Officials say the chemical is non-toxic and quickly diluted in the river. Photo by Pittsburgh CBS See more Previous article Dioxins in the Diet – U.S. Food Industry Opposes Limits Next article Now is the Time: Show Your Support for Farmers Leave a Reply Cancel reply Your email address will not be published. Required fields are marked *Comment Name * Email * Website Upload a photo / attachment to this comment (PNG, JPG, GIF - 6 MB Max File Size): (Allowed file types: jpg, gif, png, maximum file size: 6MB.