Approved Air Quality Implementation Plans in California
EPA’s Pacific Southwest (Region 9) implements and enforces federal environmental laws in Arizona, California, Hawaii, Nevada, the Pacific Islands, and 148 tribal nations.
This site contains information about air quality regulations called State Implementation Plans (SIPs) and Federal Implementation Plans (FIPs) approved by EPA within California. To find the status of SIP submittals, visit SIP Status Reports.
Approved SIPs
- EPA Approved Statewide Regulations and Statutes
- Amador County APCD
- Antelope Valley AQMD
- Bay Area AQMD
- Butte County AQMD
- Calaveras County APCD
- Colusa County APCD
- El Dorado County APCD
- Feather River AQMD
- Glenn County APCD
- Great Basin Unified APCD
- Imperial County APCD
- Kern County APCD
- Lake County AQMD
- Lassen County APCD
- Mariposa County APCD
- Mendocino County AQMD
- Modoc County APCD
- Mojave Desert AQMD
- Monterey Bay Unified APCD
- North Coast Unified AQMD
- Northern Sierra AQMD
- Northern Sonoma APCD
- Placer County APCD
- Sacramento Metropolitan AQMD
- San Diego County APCD
- San Joaquin Valley Unified APCD
- San Luis Obispo County APCD
- Santa Barbara County APCD
- Shasta County APCD
- Siskiyou County APCD
- South Coast AQMD
- Tehama County APCD
- Tuolumne County APCD
- Ventura County APCD
- Yolo-Solano AQMD
About This Website
The official SIPs, TIPs, and FIPs are contained in regulations promulgated in the Federal Register and codified in the U.S. Code of Federal Regulations (CFR). EPA’s web-versions of the approved SIPs, TIPs, and FIPs are for reference. While we make every effort to maintain the accuracy of the files accessible here, inconsistencies may occur. Please contact us using the link below if you find any errors in these files.