Environment and sustainability

Two Sound Transit employees at an environmental work site.

Building a more sustainable future together

Explore our interactive map, learn about our approach to expansion, and see how riding transit is good for the planet.

System expansion and the environment

We rely on a robust ISO 14001 Environmental and Sustainability Management System to control the environmental effects of our construction as we build the largest transit expansion in the country.

Learn about our approach

Riding transit and the environment

Riding our trains and buses offers tangible environmental benefits for the Puget Sound region’s growing communities.

See how riding transit conserves our natural environment

Environmental and sustainability documents library

View our environment and sustainability goals in our 2019 Sustainability Plan, plus explore more in our document library.

Environmental review documents for active projects can be found in our System Expansion documents library.

Make a public records request

Our work

Sustainability in our region

See how we’re working to conserve and improve our natural environment by exploring our recent projects in this interactive map.

Tap the pulsing dots for each site's information.

Sustainability targets, plan progress, and statistics

The 2023 Sustainability Progress Report and 2023 Sustainability Progress Report Appendices provide a snapshot of the agency's progress in making transit sustainable for Central Puget Sound region.

You can also review our 2025 sustainability targets and our 2024 Year-in-Review.

70%

of waste diverted in agency office buildings.

216k

tonnes of greenhouse gas emissions avoided because of passengers taking transit.

$1M

saved annually from 56 ongoing resource efficiency projects.

3,481

total homes built or in process

LEED certification

LEED certification provides an independent verification of a building’s sustainable design and is the most widely used sustainability rating system in the world.

View LEED-certified stations

Envision certification

Envision is an environmental and social certification aimed at improving civil infrastructure such as built structures that are generally not inhabited but have a major effect on their environment.