The Waynesboro DuPont Lycra plant stopped dumping mercury into the South River fork of the Shenandoah River in the 1950s. In 2001, mercury levels in fish were found to have not dropped as expected. DuPont finally agreed to pay $50 million to restore the river banks in 2017. It remains the 5th largest environmental disaster in US history. There is an indefinite fish ban.