COR900000 - Industrial Stormwater General Permit for Non-Extractive Industries

On January 31, 2024, the division issued Modification 1 to General Permit COR900000, the Industrial Stormwater General Permit for Non-Extractive Industries, along with an accompanying fact sheet. The modified permit had an effective date of July 1, 2024. On February 29, 2024, the division withdrew Modification 1 prior to its effective date as it determined that some additional corrections and clarifications were appropriate. A new draft modification with additional changes was released for public notice on March 14, 2024. The division invites stakeholders to submit public comments. The public comment period for the draft permit modification will close on Monday, April 15, 2024. If you would like to comment on the draft modification, please use the permit comment form and email your completed public comments to mary.welch@state.co.us. No other action is needed by permittees at this time in response to this proposed change.
 

View the Public Notice Documents for COR900000 Modification (Re-noticed)

Permit background

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 stormwater discharges. The COR900000 permit requires facilities to:

• Implement a stormwater management plan
• Implement specific stormwater control measures (i.e., best management practices)
• Perform inspections
• Monitor pollutants in their discharge
• Evaluate the effectiveness of the stormwater management plan and control measures

On April 28, 2023, the division reissued the Industrial Stormwater General Permit for Non-Extractive Industries (COR900000). The division held a stakeholder meeting on May 22, 2023, to inform stakeholders of the new permit. Meeting materials are available in this public folder.

The previous permit issued in 2012 remains in effect until June 30, 2024, after which the reissued permit will replace it. Current COR900000 permittees do not need to reapply at this time. The division will use information from previous applications to develop certifications under the new permit and contact permittees directly if additional information is needed.
 

"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, or runoff. To be eligible for this exclusion, you must apply for and obtain division approval by issuing a certification. Part G of the application contains a self-certifying checklist for you to assess whether your facility meets conditions of "No Exposure."