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Regional Permit Program Page

The Los Angeles Water Board regulates discharges from medium and large municipal separate storm sewer systems (MS4s) through the Regional Phase I MS4 Permit. This permit is issued under the National Pollutant Discharge Elimination System (NPDES) Program.

Past Regional Permit Information:


Program Supervisor
Ivar Ridgeway
(213) 620-2150
Senior Environmental Scientist (Supervisor)