Phase I MS4 Permits

The Phase I MS4 Permits issued throughout the State are presented below by Regional Water Board.

Region 1

• Cities of Santa Rosa, Cloverdale, Cotati, Healdsburg, Rohnert Park, Sebastopol, Ukiah, and Windsor, Sonoma County Water Agency and County of Sonoma - Order No. R1-2015-0030
  
  Additional Information:
  http://water100.waterboards.ca.gov/rb1/adopted_orders/detail.asp?discharger=sonoma&ordernumber=&ordertype=NPDES+Permit&WADbSearch1=Submit&ID=1790

Region 2

• Municipal Regional Stormwater NPDES Permit - Order No. R2-2015-0049
  
  Additional Information:
  https://www.waterboards.ca.gov/sanfranciscobay/water_issues/programs/stormwater/Municipal/

Region 3

• City of Salinas Municipal Storm Water Discharges - Order No. R3-2012-0005
  
  Additional Information:
  https://www.waterboards.ca.gov/centralcoast/water_issues/programs/stormwater/salinas.html

Region 4

• Regional MS4 Permit – Order No. R4-2021-0105
  
  Additional Information:
  https://www.waterboards.ca.gov/losangeles/water_issues/programs/stormwater/municipal/

Region 5

• Region-wide MS4 Permit - Order No. R5-2016-0040

The below permits are older and once expired, enrollees will be required to enroll under the above Region-wide MS4 permit. The below permits are included for completeness until such time as they have expired.

• County of Kern and City of Bakersfield Discharges from Municipal Separate Storm Sewer System - Order No. 5-01-130
• County of Fresno, Fresno Metropolitan Flood Control District, California State University Fresno, and the Cities of Fresno and Clovis Discharges from Municipal Separate Storm Sewer System - Order No. 5-01-048
• City of Antioch, City of Brentwood, City of Oakley, Contra Costa County, and Contra Costa County Flood Control and Water Conservation District Storm Water Discharges from Municipal Separate Storm Sewer System - Order No. R5-2010-0102
• County of Sacramento and Cities of Citrus Heights, Elk Grove, Folsom, Galt, and Sacramento Stormwater Discharges From Municipal Separate Storm Sewer Systems Resolution - Approving Storm Water Quality Improvement Plan, Adopted on 15 October 2004 - Order No. R5-2008-0142
  
  Additional Information:
  https://www.waterboards.ca.gov/centralvalley/water_issues/storm_water/municipal_permits/
  
  
• Applicable General Permit
  • Waste Discharge Requirements for Dewatering and Other Low Threat Discharges to Surface Waters, R5-2008-0081

Region 6

• City of South Lake Tahoe, El Dorado and Placer County - Order No. R6T-2017-0010
  
  Additional Information:
  https://www.waterboards.ca.gov/lahontan/water_issues/programs/storm_water/

Region 7

• Riverside County Flood Control and Water Conservation District, County of Riverside, Coachella Valley Water District, Incorporated Cities of Riverside within the Whitewater River Basin - Order No. R7-2013-0011
  
  Additional Information:
  https://www.waterboards.ca.gov/coloradoriver/water_issues/programs/stormwater/#mp1_permit_docs

Region 8

• San Bernardino County Transportation, County of San Bernardino and Incorporated Cities of San Bernardino County within the Santa Ana Region - Order No. R8-2010-0036
• County of Orange, Orange County Flood Control District and Incorporated Cities of Orange County within the Santa Ana Region - Order No. R8-2009-0030 as amended by R8-2010-0062
• Riverside County Flood Control and Water Conservation District, County of Riverside and Incorporated Cities of Riverside County within the Santa Ana Region - Order No. R8-2010-0033
  
  Additional Information:
  https://www.waterboards.ca.gov/santaana/water_issues/programs/stormwater/

Region 9

• Region-wide MS4 Permit - Order No. R9-2013-0001 as amended by Orders R9-2015-0001 and R9-2015-0100
  
  Additional Information:
  https://www.waterboards.ca.gov/sandiego/water_issues/programs/stormwater/