Stormwater Requirements butterfly

On March 6, 2014, requirements for treatment of stormwater take effect for new and redevelopment as required by the National Pollution Discharge Elimination Permit issued by the State Water Board.

Single-family residences that create and/or replace between 2,500 - 15,000 square feet or more of impervious surface, must prepare a Landscape Plan.  

Commercial or industrial projects that create and/or replace 5,000 square feet or more of impervious surface must prepare a Drainage and Stormwater Treatment and Control Plan. 

Any project that creates and/or replaces 22,500 square feet of impervious surface must submit a Stormwater Runoff Retention Plan.

Impervious Surface Threshold Performance Requirement NPDES Resolution No. R3-2013-0032 Requirements
Greater than or equal to 2,500 square feet new/replaced Site Design LID Site Design Measures
5,000 net square feet for all projects 15,000 net for detached Single Family Residences Water Quality Treatment LID strategies and treat 85thpercentile 24 hour storm
15,000 square feet new/replaced 15,000 net for Single Family Residences Runoff Retention Retain 85th or 95th percentile 24-hour storm
22,500 new/replaced Peak Management Match 2 to 10 year peak flows

Please refer to the Watershed Management Zone (WMZ) Map to determine which your project is located in or search planning permits. Please see the Submittal Checklist, Section III and speak to a Planner for details.  Please also see the Pacific Grove Area of Special Biological Significance page and the  Stormwater Technical Guide.

For more general information on stormwater please see:

stay informed

white butterfly