Menu Home

SEPA/NEPA

COVID-19 and travel at SEA Airport More Information

What is SEPA?

The Washington State Environmental Policy Act (SEPA) provides a way to identify possible environmental impacts that may result from governmental decisions. These decisions may be related to issuing permits for private projects, constructing public facilities, or adopting regulations, policies or plans. Information provided during the SEPA review process helps agency decision-makers, applicants, and the public understand how a proposal will affect the environment. This information can be used to change a proposal to reduce likely impacts. For more information about the SEPA process, visit the Washington State Department of Ecology.

What is NEPA?

The National Environmental Policy Act (NEPA) was enacted by Congress in December of 1969, and signed into law by President Nixon on January 1, 1970. Federal agencies must comply with the NEPA process, which examines the environmental impact of projects resulting from government decisions. The Port of Seattle works with Federal Aviation Administration and Environmental Protection Agency surrounding NEPA decisions. For more information on the NEPA process, visit the Council of Environmental Quality.

Documents

Title Sort descending Category
2016: Terminal 5 Final EIS Volume I Maritime
2016: Terminal 5 Final EIS Volume II Maritime
2021-01 Sea-Tac Airport — Concourse A Building Expansion for Lounges: Threshold Determination of Non-Significance Sea-Tac Airport
2021-01 Sea-Tac Airport – Concourse A Building Expansion for Lounges: Environmental Checklist Sea-Tac Airport
2021-01 Sea-Tac Airport — Concourse A Building Expansion for Lounges: Final Determination of Non-Significance Sea-Tac Airport
2021-02 Northwest Ports Clean Air Strategy 2020 Update Report Maritime
2021-02 Northwest Ports Clean Air Strategy Environmental Checklist Maritime
2021-02 Northwest Ports Clean Air Strategy Final Threshold Determination of Non-Significance Maritime
2021-03 Sea-Tac Airport - North Runway Protection Zone Emergency Access Culvert Replacement Environmental Checklist Sea-Tac Airport
2021-03 Sea-Tac Airport – North Runway Protection Zone Emergency Access Culvert Replacement: Final Determination of Non-Significance Sea-Tac Airport
2021-03 Sea-Tac Airport – Widen Arrivals: Final Determination of Non-Significance Sea-Tac Airport
2021-04 Sea-Tac Airport (SEA) – Widen Arrivals Drive: Enviornmental Checklist Sea-Tac Airport
2021-05 Pier 66 Shore Power Project DNS Threshold Determination Maritime
2021-05 Pier 66 Shore Power Project Environmental Checklist and Attachments Maritime
2021-06 Pier 66 Shore Power Threshold DNS Final Maritime
2021-06 Terminal 91 Berths 6 & 8 Redevelopment Project DRAFT Determination of Non-Significance (DNS) Maritime
2021-06 Terminal 91 Berths 6 & 8 Redevelopment Project Environmental Checklist Maritime
Back to Top