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Prevention of Significant Deterioration

We issue Prevention of Significant Deterioration (PSD) permits for industrial sources of air pollution, except for projects that are regulated by Energy Facility Site Evaluation Council, Environmental Protection Agency (EPA), or tribes.

Smokestacks at industrial facility in Washington.

About PSD permits & public comments

A PSD permit applies to new, large facilities or major changes at existing large facilities that could increase air pollution in an area.

PSD permits are for projects that significantly increase air pollution. A PSD permit is a "pre-construction permit" because the business owner must get the permit before starting construction of the proposed project. Any major modification of existing equipment also requires a PSD permit. 

Public comment periods on draft permits are updated regularly on this page.
Draft PSD permits and public comments

Determine if you need a PSD permit

If you're not sure you need a PSD permit, we can help determine if you need to apply for one. We can review the project emissions and determine whether it is subject to the PSD program.

The first step to get assistance is to complete and submit the Application for a PSD Applicability Determination. You can use this application if you are considering a project, or if it an existing project covered by an air permit application filed with an agency. 

For projects involving the the Energy Facility Site Evaluation Council or the EPA Region 10 tribal lands contact them directly.

Apply for a PSD permit

Because each PSD permit is unique, we highly recommend that applicants set up a pre-application meeting before preparing a PSD application. 

At a pre-application meeting we are able to coordinate all the state and federal agencies involved in the project, and determine the most efficient way to proceed. These meetings have proven to be highly valuable to applicants and projects tend to progress more quickly. We provide a basic PSD application to accompany the fee, and can further assist you during a pre-application meeting. For guidance on the permitting process review our Guidance on Washington State's Prevention of Significant Deterioration Permitting Program document.

Permitting process

  1. The applicant meets with us and federal land managers for a pre-application meeting to discuss what they should include in the application.
  2. The applicant submits the fee and application containing all of the necessary technical information.
  3. If we have all the needed information we consider the application complete. If the application is incomplete, we will notify the applicant that additional materials are needed.
  4. Once the application is complete, we draft a permit satisfying all regulatory requirements.
  5. We open a public comment period and, depending on public interest, may hold a public hearing.
  6. We respond to public comments and make changes to the permit as necessary.
  7. If significant changes are made to the permit, we will open another public comment period.
  8. When no significant changes are made to the permit, we'll issue the final permit. To request a pre-application meeting, please email Marc Crooks.

About Washington laws for PSD permits

Prevention of Significant Deterioration (PSD) permitting processes are performed according to Washington's  Administrative Code  for General Air Pollution Sources.