Overview:How is Storm Water Regulated Under the EPA’s NPDES Program?

• Phased approach to regulation

  • Phase I (1990): Regulated discharges from large and medium MS4s serving ,000 and eleven categories of industrial activity, including large construction > 5 acres - §402(p)(2)
  • Phase II (1999): Regulated discharges from small MS4s and small construction > 1 acres - §402(p)(6).

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