Prevention of Significant Deterioration (PSD) Permits Information
Prevention of Significant Deterioration (PSD) permits are for projects that may significantly increase air pollution. Ecology prepares PSD permits for
industrial sources of air pollution (see
EPA-Ecology delegation agreement), except for projects involving Washington's Energy Facility Site Evaluation Council (EFSEC).
This web page includes information about PSD permits that are being or have been drafted by Ecology,
comment and appeal procedures, and information for PSD permit applicants.
The permitting process is as follows:
- The owner or operator of the facility meets with Ecology and
others to discuss what to include in the application about
methodologies for dispersion modeling and how to determine what
Best Available Control Technology (BACT) to use to minimize
- The applicant submits an application
that contains all the necessary technical information to
- the level of control technology and emission limitations
constitute BACT; and
- that the pollutant emissions will not significantly impact
- Ecology drafts a permit that satisfies all regulatory requirements.
- Ecology releases the draft permit and a fact sheet
for a 30-day public comment period. These documents are posted
Prevention of Significant Deterioration Permits (PSDs) Open for Public Comment.
- After the public comment period, Ecology:
The final permit and responsiveness summary are posted Prevention of Significant Deterioration Final Permits.
- makes changes to the draft permit in response to public comment;
- writes a responsiveness summary of the public comments; and
- issues a final permit.
Certain electric power generation projects
are under the authority of Washington's Energy Facility Site Evaluation
Contact EFSEC for more information.