General Industrial Stormwater Permit

All construction activities that disturb one or more acres of soil or whose projects disturb less than one acre but are part of a larger common plan of development that in total disturbs one or more acres, are required to obtain coverage under the General Permit for Discharges of Storm Water Associated with Construction Activity Construction General Permit Order 2009-0009-DWQ.

Most construction activities fall under these requirements and include soil disturbance, clearing, grading, stock piling or excavation. Regular maintenance activities performed to restore the original line, grade, or capacity of the facility are not included.

The Construction General Permit requires the development and implementation of a Storm Water Pollution Prevention Plan, or SWPPP. The SWPPP should contain a site map(s) which show the following:

  • Construction site perimeter
  • Existing and proposed buildings, lots, roadways, storm water collection and discharge points
  • General topography both before and after construction
  • Drainage patterns across the project

The SWPPP must list Best Management Practices, or BMPs, the discharger will use to protect storm water runoff and the placement of those BMPs. Additionally, the SWPPP must contain a visual monitoring program; a chemical monitoring program for “non-visible” pollutants to be implemented if there is a failure of BMPs; and a sediment monitoring plan if the site discharges directly to a water body listed on the 303(d) list for sediment.  

If a single project traverses more than one Regional Water Quality Control Board (RWQCB) jurisdiction, a complete Notice of Intent package (Notice of Intent, site map, and fee) and Notice of Termination (upon completion of each section), must be filed for each RWQCB. For more information or to apply for a permit, please visit the California Environmental Protection Agency’s State Water Resources Control Board.