By Leslie Z. Walker
According to a Ninth Circuit decision in Natural Resources Defense Council v. U.S. EPA (9th Cir. 2008) 542 F.3d 1235, once the EPA has published a determination that a particular activity is a pollution source, The EPA has a mandatory duty to publish Effluent Limitation Guidelines (“ELGs”) within three years of that determination under section 304 of the CWA.
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