A federal appeals court is sending the Environmental Protection Agency (EPA) back to the drawing board over its wastewater regulations in a ruling that compares them to a Commodore 64 home computer. 

The U.S. Court of Appeals for the 5th Circuit ruled on Friday that the EPA’s 2015 power plant wastewater pollution rule was not stringent enough, siding with environmentalists.

Circuit Judge Stuart Kyle Duncan ruled in favor of various environmental groups that portions of the wastewater rule regulating legacy wastewater and liquid from impoundments were “unlawful.”