Here are guest commentaries on two sides of the general idea of selling treated wastewater from the Urbana & Champaign Sanitary District and a specific proposal to sell such water to a proposed fertilizer plant near Tuscola.
One piece, by University of Illinois law and engineering professors, respectively, Eric Freyfogle and Clark Bullard, argues that the area's water supply is being overdrawn and that a sale of treated water should be rejected. Here is a link to their column.
The second, by Rick Manner, executive director of the sanitary district, says the sale would not hurt the water supply and may help provide funding for improvements on the Saline Branch and the Copper Slough. Here is a link to Manner's column.