About Prevention of Significant Deterioration Permits in EPA's Pacific Southwest (Region 9)
EPA’s Pacific Southwest (Region 9) implements and enforces federal environmental laws in Arizona, California, Hawaii, Nevada, the Pacific Islands, and 148 Tribal Nations.
Title I of the Clean Air Act requires state and local permitting authorities to adopt a preconstruction permitting program for the Prevention of Significant Deterioration (PSD) of air quality.
Approved/Delegated PSD Permit Programs
PSD permits are issued by state/local/tribal permitting authorities through either (1) an EPA-approved PSD program adopted under 40 CFR 51.166 or (2) a delegation of authority from EPA.
Tribes may, but are not required to, adopt their own PSD permit programs. Region 9 has not approved a PSD permit program or delegated PSD permitting authority to any Tribes.
Learn more about permitting authority in:
Arizona | California | Hawaii/Pacific Islands | Nevada
EPA Oversight of PSD Programs
EPA may review and comment on PSD permits during the public comment period. Some permitting authorities submit their actions to EPA through the Electronic Permit System (EPS).
See the NSR Permits Dashboard for information regarding the EPA’s oversight of individual PSD permit actions, including permit documents. This database is only complete where permitting authorities submit PSD permits electronically to the EPA.
PSD Permits Issued by Region 9
EPA is the PSD permitting authority in areas where an approved or delegated PSD program is not in place, including on Tribal lands. EPA issues PSD permits according to 40 CFR 52.21.
- View Pending and Completed PSD Permit Actions
- Sign Up to Receive Email from Region 9's Public Notice Distribution List