Illinois Air Permitting: How CPI Supports Your Compliance Process
CPI designs and builds oxidizer systems — we are not a permitting firm, and every Illinois facility's permit obligations depend on details specific to that site. Engaging an air permitting professional who is familiar not just with federal requirements, but with Illinois EPA rules and any applicable local air district requirements, is strongly recommended.
What CPI provides to support that process:
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Equipment data for your permit application. Emission rates, destruction/removal efficiency, stack parameters, fuel usage, and control technology specifications.
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Designs built to the compliance target. Our applications engineering team works with the parties responsible for your permitting to confirm the oxidizer meets your IEPA permit's destruction efficiency and reporting requirements.
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Post-startup compliance support,providing equipment performance data for annual reporting or agency inspections.
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A proven Illinois track record. CPI oxidizer systems are permitted and operating across Illinois — enabling our customers to operate in compliance with their IEPA permit obligations.
For general reference, Illinois air permits are administered by the Illinois Environmental Protection Agency (IEPA), Bureau of Air, within U.S. EPA Region 5. See the IEPA's Air Permits overview for permit types and applications, or search existing issued permits via the IEPA Document Explorer.
Supporting Your Project Team
CPI works with the parties responsible for your Illinois project — environmental consultant, EHS, or engineering — providing:
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BACT/MACT analysis support with the technical data needed to evaluate control technology options.
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CPI oxidizers already operating in Illinois — a proven, regulator-accepted track record.
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Turn-key project support, from evaluation through commissioning, including installation estimates.
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24-hour Technical Service Group for support long after commissioning.
Environmental consultants can find CPI's dedicated resources, including project support details and client examples, here: Environmental Consultant Resources →
"I recommend CPI exclusively...If someone does a really good job, and if our clients have great things to say, that's who I recommend." — Senior Consultant
Aftermarket Service & Support — Illinois
CPI's aftermarket service is performed by direct CPI employees — not third-party contractors — so Illinois facilities get factory-trained technicians who know CPI equipment inside and out. And because CPI is headquartered right here in Lake Zurich, Illinois facilities also benefit from local proximity to our team, parts, and technical staff.
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Service performed by CPI's own technicians
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Local presence
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Parts & inventory
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Preventive maintenance
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Emergency service, including 24/7 phone support
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Annual inspections and testing support, helping facilities meet inspection or maintenance requirements that may be specified in their air permit
Schedule Illinois Service →
Frequently Asked Questions
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Does CPI manufacture regenerative thermal oxidizers for Illinois facilities?
Yes. CPI designs and manufactures custom RTOs, catalytic oxidizers, and thermal oxidizers for Illinois manufacturers, drawing on successful implementations throughout Illinois and across the United States.
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Does CPI have any oxidizers currently operating in Illinois?
Yes — CPI oxidizer systems are installed and operating at Illinois facilities, permitted and accepted by the Illinois EPA. This in-state track record means Illinois regulators are already familiar with CPI's equipment and documentation approach.
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Does CPI provide aftermarket service and maintenance in Illinois?
Yes. CPI's aftermarket service is performed by direct CPI employees, rather than third-party contractors — and because CPI is headquartered in Lake Zurich, Illinois facilities also benefit from local proximity to our team.
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Does CPI only service oxidizers it manufactured, or other brands too?
CPI services most makes and models of regenerative thermal oxidizers, catalytic oxidizers, and thermal oxidizers — not just CPI-built systems.
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Does CPI handle Illinois EPA air permitting for my facility?
No. CPI is not a permitting firm. Seek expert guidance from an environmental consultant, EHS, or engineering resource to confirm your specific permit requirements - CPI provides the supporting oxidizer information necessary for the permitting process.
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Does CPI work with environmental consultants?
Yes, CPI works closely with environmental consultants on BACT/MACT analysis and project support, and maintains a proven track record of oxidizers operating in Illinois.
Explore More
See where CPI provides oxidizer aftermarket service by state: CPI Oxidizer Resource Center — All Locations
CPI's Core Technology: Regenerative Thermal Oxidizers | Thermal Oxidizers | Catalytic Oxidizers
For Environmental Consultants, EHS & Engineering Teams: Environmental Consultant Resources & Support →
