(April 18, 2019, 1:48 PM EDT) -- WASHINGTON, D.C. — Two environmental groups on April 15 filed a petition for a writ of certiorari in the U.S. Supreme Court contending that a lower court’s ruling that held that there is an exemption to the Clean Water Act (CWA) related to the protection of navigable waters from pollutants added from a point source via groundwater is not supported by the text and structure of the CWA (Tennessee Clean Water Network, et al. v. Tennessee Valley Authority, No. 18-1307,...