The EPA has decided to step aside and will not regulate ballast water discharges, according to this article in The Mercury News. The reason given was that the Coast Guard has already taken the lead in regulation. Environmental groups are upset, and some are threatening to sue the EPA, with the goal of getting them to invoke the powerful Clean Water Act in an attempt to stem the flow of countless numbers of non-native aquatic species into U.S. waters. You can read more about what the Coast Guard's doing for ballast water management by clicking here.
Thanks to a member of the ALIENS-L listserver for posting a link to this story.