The Clean Water Act sometimes requires a permit for the indirect discharge of pollutants from a point source to navigable waters, but only when the discharge is the “functional equivalent” of a direct discharge, the Supreme Court held on April 23.  The Court’s 6-3 opinion in County of Maui v. Hawaii Wildlife Fund (No. 18-260) addresses a circuit split regarding whether indirect discharges to navigable water via groundwater are subject to the Act’s National Pollutant Discharge Elimination System (“NPDES”) permitting program, but it has implications for other types of indirect discharges as well.  Although the Court identified some factors that may help determine when a discharge is the functional equivalent of a direct discharge—especially the time and distance between the discharge of a pollutant from a point source and the pollutant’s arrival in navigable waters—its opinion is likely to create substantial uncertainty for the regulated community as the Environmental Protection Agency (“EPA”), litigants, and the courts attempt to apply the Court’s multi-factor test to a variety of factual scenarios.
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