What is the Program Environmental Impact Report?


SCAG’s Program Environmental Impact Report (PEIR) is an environmental report that will analyze and disclose potential impacts of the Connect SoCal plan on the environment. The report is required under law by the California Environmental Quality Act (CEQA). SCAG’s PEIR will provide a region-wide assessment of potential significant environmental effects of Connect SoCal as well as consider broad policy alternatives and program-wide mitigation measures. More importantly, the PEIR provides a foundation for subsequent, project-specific environmental reviews that will be conducted by local implementation agencies.

What will the PEIR Analyze?

The PEIR is a programmatic document that will analyze potential effects of Connect SoCal on the environment. Although the Connect SoCal plan includes many transportation projects, the PEIR does not specifically analyze environmental effects of any individual transportation or development project. Project-level environmental analyses will be prepared by implementing agencies on a project-by-project basis as projects proceed through the design and decision-making process. SCAG’s PEIR will analyze:​

Aesthetics and Views
Agricultural and Forestry Resources
Air Quality
Biological Resources and Open Space
Cultural Resources
Geology, Soils and Mineral Resources
Greenhouse Gas Emissions and Climate Change
Tribal Cultural Resources

Hazards and Hazardous Materials
Hydrology and Water Quality​
Land Use and Planning
Population and Housing
Transportation, Traffic and Safety
Public Services and Utilities


For more information on the Connect SoCal PEIR, please contact Mr. Roland Ok at 2020PEIR@scag.ca.gov.