Approved Air Quality Implementation Plans in California
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California State Implementation Plans (SIPs)
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.
EPA’s Pacific Southwest (Region 9) implements and enforces federal environmental laws in Arizona, California, Hawaii, Nevada, the Pacific Islands, and 148 tribal nations.
Approved SIPs
- Statewide Regulations and Statutes
- Test Procedures, Test Methods, and Specifications
- Local Jurisdiction Ordinances and Municipal Code
- EPA-Approved Source-Specific Requirements
- Amador County APCD
- Antelope Valley AQMD
- Bay Area AQMD
- Butte County AQMD
- Calaveras County APCD
- Colusa County APCD
- Eastern Kern County APCD
- El Dorado County AQMD
- Feather River AQMD
- Glenn County APCD
- Great Basin Unified APCD
- Imperial 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 AQMD
- Siskiyou County APCD
- South Coast AQMD
- Tehama County APCD
- Tuolumne County APCD
- Ventura County APCD
- Yolo-Solano AQMD
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. If you experience a problem reading a document with assistive technology, please contact us.