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SUSMP Infiltration Requirements and Guidelines [pdf 49kb]

Flow Chart of the Plan Review and Approval Process

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SUSMP Fees [PDF 143Kb]


Redevelopment Definition

Development BMPs Handbook Part B: Planning Activities

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SUSMP Project Categories

Site Specific Categories



Redevelopment Definition


On December 13, 2001, the Regional Water Quality Control Board issued a Municipal Storm Water National Pollutant Discharge Elimination System Permit (NPDES Permit No. CAS004001) that requires new development and redevelopment projects to incorporate storm water mitigation measures, effective September 2, 2002.

Depending on the type of project, either a Standard Urban Stormwater Mitigation Plan (SUSMP) or a Site Specific Mitigation Plan is required to reduce the quantity and improve the quality of rainfall runoff that leaves the site. Developers are encouraged to begin work on complying with these regulations by visiting the Watershed Protection Division (WPD) in the design phase of their projects.

SUSMP  Project Categories:rtegories:

Site Specific Project Categories:

  • Vehicle or Equipment Fueling Areas
  • Vehicle or Equipment Maintenance Areas, including Washing and Repair
  • Commercial or Industrial Waste Handling or Storage
  • Outdoor Handling or Storage of Hazardous Materials
  • Outdoor Manufacturing Areas
  • Outdoor Food Handling or Processing
  • Outdoor Animal Care, Confinement, or Slaughter
  • Outdoor Horticultural Activities
  • Major Transportation Projects
Example of stencil


Effective January 19, 2007, a plan check fee will be collected to review stormwater mitigation measures for new development and redevelopment projects under either a Standard Urban Stormwater Mitigation Plan (SUSMP) or a Site Specific Mitigation Plan.

On December 14, 2006, The City of Los Angeles approved Ordinance No. 178132 amending the City Code to recover fees of providing Best Management Practices Plan Check to comply with SUSMP or the Site Specific Plan.

The ordinance and fee schedule can be downloaded by clicking here.



Redevelopment Projects, "…are land-disturbing activity that results in the creation, addition, or replacement of 5000 square feet or more of impervious surface area on an already developed site within the categories listed above. Existing single family non-hillside structures are exempt from the redevelopment requirements.

If a redevelopment results in an alteration to more than fifty percent of impervious surfaces of an existing development, then the entire project must be mitigated. If a redevelopment results in an alteration to less than fifty percent of the impervious surface of an existing development, and the existing development was not subject to storm water quality control requirements, then only the alteration must be mitigated."

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