Storm Drain

San Joaquin County Stormwater Logo


NPDES Phase 1 Post-Cosntruction


The 2009 Storm Water Quality Control Criteria (2009 SWQCCP) for the County of San Joaquin (County) is an update to the County’s 2003 SWQCCP with special emphasis on the implementation on low impact development (LID) strategies. LID is an environmentally sound technology and an economically sustainable approach to addressing the adverse impacts urbanization can have on aquatic resources. LID's goal is to mimic a site's predevelopment hydrology by using design techniques that infiltrate, filter, store, evaporate, and detain runoff close to its source. SWQCCP strategies are not only applicable to open space, but also rooftops, streetscapes, parking lots, sidewalks, and medians. LID is a versatile approach that can be applied equally well to new development, urban retrofits, and redevelopment/revitalization projects. By managing runoff close to its source though intelligent site design, LID can enhance the local environment, protect public health, and improve community livability


  • Protect the water of the County from adverse impacts of urban runoff;
  • Ensure that the implementation of the measures is consistent with NPDES permit and other State requirements;
  • Provide clear development standards for developers, design engineers, agency engineers, and planners to use in the selection and implementation of appropriate storm water control measures;
  • Integrate LID strategies; and
  • Provide maintenance procedures to ensure that the selected control measures will be maintained to provide effective, long-term pollution control.
The 2009 SWQCCP only applies to Priority projects in the NPDES Phase 1 Area.  The County has created a tool called the  Volume Reduction Requirement Calculator to help developers recognize when they have achieved the volume reduction requirement.  For a map of the NPDES Phase 1 Area, the 2009 SWQCCP, a fact sheet of the 2009 SWQCCP  and the Volume Reduction Requirement Calculator click on the appropriate links below.

NPDES Phase 1 Area Map        
2009 SWQCPP         Fact Sheet         Volume Reduction Requirement Calculator


Priority projects are defined as:

  • Significant redevelopment (addition of 5,000 ft2 or more);
  • Home subdivisions of 10 housing units or more;
  • Commercial development 5,000 ft2 or more;
  • Automotive repair shops;
  • Restaurants;
  • Parking lots 5,000 ft2 or more or with 25 or more parking spaces;
  • Streets and roads greater than one acre of impervious area;
  • Retail gasoline outlet.

LID techniques include:

  • Preserve natural hydrology;
  • Manage storm water close to the rain falls;
  • Minimize site disturbance and grading;
  • Retain vegetation;
  • Cluster development;
  • Reduce impervious surface;
  • Reforestation;
  • Bioretention systems;
  • Landscape with native plants;
  • Compost amended soils;
  • Pervious concrete;
  • Porous asphalt;
  • Permeable pavers;
  • Eco roofs (green roofs)


Links to LID Web Sites:


EPA's LID and other Green Design Strategies

EPA's Green Infrastructure


San Joaquin River


PO Box 1810 / 1810 East Hazelton Avenue, Stockton, California 95201    |    Phone  (209)  468 - 3055

San Joaquin County Logo

The Storm water Pollution Prevention Program is a Program of the

San Joaquin County

Public Works Department

San Joaquin County Public Works Logo