Environmental
Washington's Clean Water Act permits (NPDES permits) are required for:
AAll residential construction projects
BDischarges of pollutants into surface waters from point sources✓ Correct
CAll irrigation activities on agricultural land
DSeptic system installations only
Explanation
National Pollutant Discharge Elimination System (NPDES) permits under the federal Clean Water Act (administered in Washington by Ecology) are required for point source discharges of pollutants into navigable waters or their tributaries.
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