- Legally-enforceable documents designed to improve compliance by clarifying what facilities (sources) must do to control air pollution.
- Required by Title V of the Clean Air Act.
- Issued to all large sources (“major” sources) and a limited number of smaller sources (called “area” sources, “minor” sources, or “non-major” sources).
- Most are issued by State or local agencies (“part 70” permits); a small number are issued by EPA (“part 71” permits).
- Permits include pollution-control requirements from federal or state regulations that apply to a source.
- Other air permits may be required (e.g., “Pre-construction” permits, “PSD” permits, or “NSR” permits), but this web site does not address such permits.
More Detailed Information on Operating Permits
- Air Pollution Operating Permit Program Update - Key Features and Benefits - A plain language guide (February 1998).
- Frequently Asked Questions About Permits - Includes topics related to title V and PSD/NSR permits (EPA Region 9).
- Who Has to Obtain a Title V Permit - Describes which types of sources have to get permits.
- Definitions of Selected Permitting Terms (EPA Region 9).