Industrial Stormwater General Permit for Non-Extractive Industries (COR900000)


Beginning in 2021 and continuing through 2022, the division led a stakeholder engagement process to gain feedback about potential changes to include in the COR900000 permit renewal. Following stakeholder feedback, the division released a draft COR900000 permit on March 10, 2022, with a public comment period that extended until August 5, 2022. The division has considered comments received during the public comment period and expects to issue the final permit, along with a response to comments, in the coming weeks or months. Here is a list of important changes to the new permit:

  • Benchmarks and corrective actions
  • PFAS requirements
  • Coal tar sealant eligibility requirement
 View public comments received on draft COR900000 renewal


​No Exposure Exclusion from CDPS Storm Water Permitting

"No Exposure" is an alternative to obtaining coverage under the COR900000 permit. In this context, "No Exposure" means that storm-resistant sheltering is in place to prevent exposure to rain, snow, snowmelt and/or runoff. To be eligible for this exclusion, you must apply for and obtain division approval through the issuance of a certification. Part G of the application contains a self-certifying checklist for you to assess whether your facility meets conditions of "No Exposure." 


How to get involved

Permit renewal stakeholder process

The renewal of the COR9000000 general permit to discharge stormwater associated with Non-Extractive Industrial Activity is in progress.

We are hosting stakeholder meetings to discuss updates and gather input.

We would like your participation in the renewal process. Please sign-up for email notifications to stay informed about updates, meetings, and other information related to the renewal process. The topic for this subscription should be Permits - Industrial.


Meeting materials

All available meeting materials (including previous meetings) can be found in the Public Materials for Industrial Stormwater General Permit Revisions Google drive folder.


For information related to the COR900000 permit renewal process or questions, contact Mary Welch by phone at 303-692-3428 or by email at