Layers:

Layer: Phase I MS4 Boundaries (16)


Name: Phase I MS4 Boundaries

Display Field: Name

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Description: The Municipal Storm Water Permitting Program regulates storm water discharges from municipal separate storm sewer systems (MS4s). Municipal or urban areas commonly include large impervious surfaces which contribute to an increase in stormwater runoff. Under Phase I, which started in 1990, the Regional Water Quality Control Boards have adopted National Pollutant Discharge Elimination System General Permit (NPDES) storm water permits for medium (serving between 100,000 and 250,000 people) and large (serving 250,000 people) municipalities. For more information please reference the State Water Resources Control Board Phase I MS4 Permits web page at https://www.waterboards.ca.gov/water_issues/programs/stormwater/phase_i_municipal.html.

Copyright Text: California State Water Resources Control Board

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Templates:

Name: Phase I MS4 Boundaries
Description:
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Last Edit Date: 8/9/2024 4:35:08 PM

Schema Last Edit Date: 8/9/2024 4:35:08 PM

Data Last Edit Date: 8/9/2024 4:35:08 PM