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


In order to protect Colorado waters from pollutants in stormwater runoff, the division requires operators of certain industrial facilities to obtain permit coverage for actual or potential discharges of stormwater. Required coverage is determined primarily by an industries’ SIC code, or in a few cases, an industry description. The COR900000 permit requires facilities to implement a stormwater management plan, implement specific stormwater control measures, also known as best management practices, perform inspections and monitor pollutants in their discharge. Permittees must also evaluate the effectiveness of their stormwater management plan and control measures by comparing stormwater monitoring data to benchmark concentrations of certain pollutants. On Mar. 10, 2022, the division issued a draft renewal of the COR900000 for public notice. The public comment period ended on Jun. 13, 2022.

Per a request, the division is facilitating a responsive comment period on the comments received during the public notice period, which ended Jul. 15, 2022.

Responsive comments can be viewed using the link below. The rebuttal comment period will begin Jul. 22, 2022, through Aug. 5, 2022.

Regulation Action Start Date Deadline
61.5(2)(d)(i)(B)(III)(a) File responsive
07/01/2022 07/15/2022


File rebuttal
07/22/2022 08/05/2022


Please use the Responsive Comment Form available for download and email it to the permit writer: Mary Welch, or mailed to the division at the following address: CDPHE, WQCD-P-B2, 4300 Cherry Creek Drive South, Denver, Colorado 80246-1530. The division is reviewing submitted comments and will be developing responses for review in late 2022. 

 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