NPDES Municipal Permit

The 1987 amendment to the Clean Water Act, required that the Environmental Protection Agency issue National Pollutant Discharge Elimination System (NPDES) Municipal Stormwater permits for discharges from large Municipal Separate Storm Sewer Systems (or MS4s), which are systems serving a population of 250,000 or more.

An NPDES Permit allows clean stormwater discharges into rivers, lakes or the ocean. The California State Water Resources Control Board (Los Angeles Region) issues NPDES Permits in the Los Angeles area with the permit requiring a decrease in pollutants in stormwater and urban runoff.

The City of Los Angeles is in compliance with all requirements of the NPDES Municipal Permit.

For more information on Los Angeles’ NPDES Permit, please visit the Los Angeles Water Resources Control Board.