Major Source Info & Air Operating Permits

Facilities with Air Operating Permits: 2025 Annual Emissions (CO2e totals are from 2024)

What is an Air Operating Permit?

The Federal Clean Air Act requires us to renew air operating permits every five years. These comprehensive permits compile air-related regulations and other permits in one place and spell out emissions, monitoring, record keeping, and reporting requirements that businesses must meet.

Like all of our permits, air operating permits help businesses know what they need to do to be in compliance, and help us and the public hold them accountable for abiding by the laws, rules, regulations and conditions of their permits. Together, we can be partners in keeping the air clean.

Most businesses don’t need one, but air operating permits are required if a facility has the potential to emit:

• More than 100 tons per year of any pollutant.

• Collect and record a business’s air quality related requirements in one document.
• Require the facility to regularly monitor sources of air pollutants, fix leaks and problems promptly, and keep records of what is being done.
• Require the facility to regularly report any failures to follow the air operating permit terms.
• Require the facility to report releases of excess emissions.
• Clarify monitoring, testing, recordkeeping and reporting requirements.
• Require the facility to certify yearly whether they’ve met the terms of the air operating permit.
• Make the terms of the air operating permit federally enforceable.

• Increase or decrease emission limits for a facility.
• Permit or approve new construction.
• Require environmental impact statements or other reviews under the State Environmental Policy Act

Each Air Operating Permit has e a support document called a Statement of Basis (SOB) which provides valuable additional information including facility information and the basis for regulatory applicability. Statements of Basis are not enforceable documents in themselves. Rather, they support the enforceable conditions in the Air Operating Permit.

Testing Forms

Compliance at Major Sources

We work to ensure that major businesses meet the terms of their permits and air quality regulations to protect health and the environment. We use various methods to monitor these facilities’ compliance, including:

• Monitoring air emissions and processes, and reviewing records and reports submitted by the facility, as required by their permits.
• Requiring emissions tests.
• Conducting compliance evaluations.
• Inspecting facilities.

As the primary air quality agency in our jurisdiction, we strive to meet U.S. Environmental Protection Agency policy for compliance monitoring activities. NWCAA is a delegated agency for selected NSPS (40 CFR Part 60) and NESHAP (40 CFR Parts 61, 62, & 63) Regulations

You can find more information about EPA’s compliance policies and program on the compliance page of EPA’s website.

Our compliance monitoring work provides us with necessary evidence if we need to pursue enforcement against the facilities we regulate. We report our compliance monitoring activities and enforcement actions for major businesses and some non-major businesses to the EPA national database: Enforcement and Compliance History Online (ECHO).

If your air quality is affected at home or work by activities at a major business, you can submit a complaint. Because of the number of complaints we receive, we focus our responses on incidents that affect multiple people and properties

Department of Ecology: Additional Air Permits Information

EPA Greenhouse Gas Reporting Program

Pollution Prevention

Additional emissions inventories with regional and national information: