How does the permit process work?

The District issues two permits for a stationary source. The first - issued before construction begins - is an Authority to Construct. When construction is completed and Authority to Construct permit requirements are met, the District issues a Permit to Operate.

Authority to Construct (A/C)

The A/C permit allows construction of a new facility or the installation or the modification of equipment at an existing facility.

Inspection & Temporary Operation

Following construction, installation, or modification, District staff inspects the facility to ensure proper installation of all equipment. A temporary operating period is allowed for testing, calibration, and demonstration of compliance with conditions of the A/C.

Permit to Operate (P/O)

The P/O allows continued operation in accordance with all permit conditions and local, state, and federal air pollution requirements.


The P/O is re-evaluated every year and is updated as necessary to ensure compliance and to reflect any changes to local, state, or federal requirements.

Show All Answers

1. What are stationary source permits?
2. Who needs a permit?
3. Why do I need a permit?
4. How does the permit process work?
5. What is an authority to construct (A/C)?
6. What is a permit to operate (P/O)?
7. How do I apply for an air quality permit?
8. What are the permit fees?
9. How are permits renewed?