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Cascade Steel Rolling Mills, 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 in the risk assessment process.

  • Each step of the CAO risk assessment process has a section that includes DEQ's communications and deliverables with the facility.
  • The color-coded 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

Air toxics assessment process


​An Emissions Inventory is a list of each toxic air contaminant regulated under the Cleaner Air Oregon rules that a facility emits in a given year. The Emissions Inventory includes the amount of each toxic air contaminant emitted from each individual emissions-producing activity. 

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. 7, 2022: Facility called in to CAO program.

​May 9, 2022: Cascade Steel submits Emissions Inventory. 

​Aug. 26, 2022: DEQ responds to the Emissions Inventory submittal with a request for revisions and additional information.

Aug. 31, 2022: Facility submits Emissions Inventory extension request.

Sept. 1, 2022: DEQ responded to Emission Inventory request.


Sept. 23, 2022: Facility submits Emissions Inventory extension request. 
Oct. 3, 2022: DEQ responds to Emissions Inventory extension request. 
Why did DEQ monitor air quality near Cascade Steel Rolling Mills?
Cascade Steel Rolling Mills was called in to the Cleaner Air Oregon program in February 2022, triggering a requirement that the facility report emissions from the factory. However, the Emissions Inventory the facility submitted assumed the presence of pollution control devices and modifications to existing equipment that the facility does not presently have. These proposed changes to existing conditions at the facility were not previously discussed with, or approved by, DEQ. Because conditions represented in the Emissions Inventory differed so substantially from the actual facility configurations, DEQ performed preliminary modeling of the underlying emissions data provided by the facility. Results showed the potential for elevated levels of metals in the air surrounding the facility when certain weather conditions exist. Because of these concerning results, DEQ placed an air monitor near the facility and began sampling to gain a better understanding of the current levels of metals in the air.

What did the monitoring find?
DEQ sampled at a location just north of the facility boundary from Aug. 16 to Oct. 13, 2022. Generally, the monitoring showed levels of metals lower than the preliminary modeling predicted. However, on Sept. 27 the level of manganese monitored in the air exceeded the acute (i.e., short-term exposure) Ambient Benchmark Concentration. The Ambient Benchmark Concentration is the level at which a person breathing the contaminant may have an increased risk of health impacts. It does not mean that health effects will necessarily occur.

Unlike the other days DEQ sampled, the wind on Sept. 27 was blowing from the southwest, which is more typical of winter weather patterns. This wind direction aligns with when one would expect to see impacts at the monitor from the facility, meaning emissions blew from the facility towards the monitor. This indicates the potential for localized instances of elevated levels of metals, depending on weather conditions.

What does this mean for my health?
High enough levels of manganese exposure during infant and child development can affect their brain function. DEQ and Oregon Health Authority do not expect that the levels of manganese observed on Sept. 27, the highest values observed, are high enough to affect the neurodevelopment of an infant or child who spent time near the monitoring site that day. This is due to health protective assumptions used when setting an Ambient Benchmark Concentration and the limited extent of the exceedance monitored on Sept. 27.

However, monitoring results only represent a snapshot in time at one location. Data from one monitoring location over a short timespan are not sufficient to draw conclusions about the potential risk from facility emissions to people who live, work or congregate near the facility more generally.

Next steps
DEQ intends to resume sampling near the facility throughout the winter to better understand how seasonal differences in weather can impact ambient levels of metals in the air. DEQ also continues to evaluate the cumulative impact of the facility's emissions on neighbors' health through the Cleaner Air Oregon program. 


About the facility 

Cascade Steel Rolling Mills, Inc. processes ferrous scrap metal (for example, auto bodies, machines, and appliances) to produce various steel products, such as reinforcing bar (rebar) for the construction industry, flat and round merchant bar for steel fabrication, and various finished products. The steel mill was founded in 1968 and now consists of a melt shop, a rolling mill, and supporting operations. The current mill melt shop capacity is 948,000 tons of steel production per year. The 85-acre facility is served by truck and rail.

DEQ contact

Julia DeGagné

Site address

3200 N Hwy 99W McMinnville, OR 97128 

Current air permit 

Title V, 36-5034-TV-01