functional equivalent of a direct discharge

In County of Maui, Hawaii v. Hawaii Wildlife Fund the Supreme Court held 6-3 that when there is a “functional equivalent of a direct discharge” from a point source to navigable waters an appropriate permit is required under the Clean Water Act.

The Clean Water Act forbids the “addition” of any pollutant “from a point source” to “navigable waters” without a National Pollutant Discharge Elimination System (NPDES) permit. In this case the County...