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Wolf Steel Foundry, Inc.

Cleaner Air Oregon is a health-based permitting program that regulates emissions of toxic air contaminants from facilities based on risk to nearby communities. CAO requires facilities to report toxic air contaminant emissions, assess potential health risks to people nearby and reduce toxic air contaminant risk if it exceeds legal limits.

As part of the Cleaner Air Oregon process, each facility has a dedicated web page to provide communities access to facility information and updates on where it is involved in the process.

  • Each step of the CAO risk assessment process has a section that includes DEQ's communications and deliverables from the facility.
  • The graphic below shows where a facility is in the Cleaner Air Oregon Process.

For additional information and history of the program, visit the Cleaner Air Oregon web page

Emissions Inventory is highlighted

The Emissions Inventory provides information on all the Toxic Air Contaminant emissions from a facility, and includes information on a facility’s operations and activities, as well as fuel and material usage rates. This is often the longest step in the CAO risk assessment process as DEQ needs to verify that all activities have been accounted for, and that the most representative emissions data available are used. In some cases, DEQ will require a facility to perform source testing at this stage if insufficient data is available to estimate emissions. ​

For an introduction to emissions inventories and why they matter, please see EPA's Fact Sheet. A facility-specific emissions inventory timeline and associated documents are linked below. 

​Feb. 1, 2022: DEQ calls facility into the CAO program.

May 2, 2022: Facility submitted Emissions Inventory. 

Dec. 2, 2022: DEQ responded to the Emissions Inventory with a request for revisions and additional information. 

Dec. 20, 2022: Facility submitted Emissions Inventory extension request. 

Dec. 22, 2022: DEQ responded to Emissions Inventory extension request.

Jan. 12, 2023: Facility submitted revised Emissions Inventory.

March 29, 2023: DEQ responded to the Emissions Inventory with a request for revisions and additional information.

April 28, 2023: Facility submitted revised Emissions Inventory.

May 26, 2023: Facility submitted letter outlining plans to shut down in the near future and terminate its Simple ACDP. The CAO risk assessment will no longer be needed.  


Marissa Meyer
Project Manager

Site location

6160 S. Whiskey Hill Rd. Hubbard, OR 97032


Current Air Permit

How to get involved

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If you have questions, please email us.