About Nelson Geotechnical Associates, Inc.

Nelson Geotechnical is now part of MacKay, a multi-disciplinary engineering, surveying, environmental, and construction services firm serving clients across the United States. NGA provides technically advanced, sophisticated solutions from design through the construction phase of your projects, including preliminary and final evaluations to full construction monitoring and inspection services.This partnership reflects a shared commitment to technical excellence, strong client relationships, and a people-first culture.

As we continue integrating with MacKay, Nelson Geotechnical will officially transition to the MacKay brand in September 2026. Until then, we will continue operating as Nelson Geotech while taking advantage of the expanded resources, broader expertise, and national reach of the larger organization.

For our clients, the experience remains seamless. The trusted team you know today remains in place, backed by the additional capabilities, specialized services, and support of MacKay.

We Get Your Projects On Solid Ground

Our highly skilled team of professionals will aid your design teams in selecting the most technically advanced and economical solutions for any geotechnical issues that may impact your projects. Depending on the subsurface conditions, budget and project timelines, selecting the best design approach at an early stage can be critical to the successful completion of the project.

Whether on land or below water, Washington State offers up complicated building challenges. The tasks performed by our geotechnical team are numerous, in-depth and paramount to the long-term stability of structures and earthworks. With the advent of more ground improvement techniques and sustainable design methods, we at NGA welcome the challenge to ensure the strength of your foundations, slopes and walls, while reducing their environmental impact.