Los Angeles County Municipal NPDES Permit

The Los Angeles Water Board regulates discharges from medium and large municipal separate storm sewer systems (MS4s) through the Los Angeles County, Long Beach, and Ventura County MS4 Permits. These permits are issued under the National Pollutant Discharge Elimination System (NPDES) Program

Permits

Los Angeles County

• Los Angeles County MS4 Permit Program Page
• Time Schedule Orders
• Watershed Management Programs
• Administrative Petitions
• Permit Amendments

Long Beach

• Long Beach MS4 Program Page
• Watershed Management Programs
  • Long Beach Nearshore
  • Los Cerritos Channel Watershed
  • Lower Los Angeles River Watershed
  • Lower San Gabriel River Watershed
• Permit Amendments

Ventura County

• Ventura County MS4 Permit Program Page

Announcements

• Coming Soon

Additional Information

• Stormwater Funding
• Trash TMDLs