Featured Projects

We work with municipalities, special districts, farmers, and private industry in the Pacific Northwest, California, and internationally.

San Luis Obispo County Key Well Index Analysis

Portland Harbor Superfund Site: River Mile 11 East Cleanup

Port of Tacoma Remedial Investigation and Feasibility Study

Sterling Park Stormwater Recharge

North Santiam Drought Planning

Our Team

Most of our projects come from clients who hire us again and again. That's because they value the practical expertise we bring to the table and our commitment to long-term partnerships.


We hire driven and talented people looking to shape the future of GSI. If you are motivated to grow your practice and invest in your career, get in touch.

Office Locations

We work in the Pacific Northwest, California, and internationally from our five West Coast offices.

Latest News

GSI in Spain

GSI's Larry Eaton and Jason Melady are headed to ISMAR10—the 10th International Symposium on Managed…