You may have heard our name (O’Neill Service Group/OSG) from a business colleague, client, or friend.  We have gained a reputation of having small firm values yet large firm expertise, talent and resources.  We believe it is partly due to our unique story.

Our StoryOGS Geological Services, Environmental Services Bellevue, WA

In 2008, Dennis O’Neill first established O’Neill Environmental Services (OES) with a goal to provide Environmental and Geological Services to several local general contractors in the Puget Sound Region.   As a young company, the firm experienced exceptional growth despite the country’s most challenging economic times.  Success was the result of our team approach, technical expertise, responsiveness and commitment to client service.  We continue to evolve through innovation, adaptability and establishing a positive and respected reputation in the construction industry.

Our Growing Family

To meet our client’s request in 2010, quality assurance/quality control (QA/QC) materials inspections and testing services were added to support several large–scale Transportation Design-Build projects.   These additional services meant employing new staff, establishing a rigorous training and mentoring program.  OES has grown tremendously from a small group to over 50 experienced engineers, scientists, inspectors and technicians providing a broader range of QA/QC materials inspections and testing and environmental services.

Our New Home and Name

In 2012, O’Neill Environmental Services (OES) rebranded its name to O’Neill Service Group (OSG) to more closely reflect the broad range of QA/QC and Environmental Services.   In 2015, we relocated to Redmond, WA increasing our laboratory and professional offices to better serve our client’s needs.   The facility was fully remodel to include expanded engineering offices and a larger laboratory space for additional testing equipment.

Who We Are