Leading Geosynthetic Liner Company for Durable Containment

Your Expert Resource for Geosynthetic Liners

We Are Geosynthetic Advisors

Geosynthetic Advisors (formerly GM Liners) is a full-service geosynthetic liner company with nearly 30+ years of experience, serving the region since 1996. We specialize in installing geosynthetic liners, working on projects including design-build delivery, offering fully integrated construction services for both containment and geosynthetic-related civil infrastructure projects.

With over 300 million square feet of geosynthetic materials installed and supplied, we bring the scale, expertise, and reliability needed to handle complex, large-scale projects. Operating throughout the Pacific Northwest and Western United States, we consistently deliver tailored, start-to-finish solutions—even in the region’s most demanding environments.

Committed to Ensuring Your Geosynthetic Lining Project is A Success.

Our Comprehensive Geosynthetic Services

Geosynthetic Installation

Leak Detection & Repair

Geosynthetic Consulting

Design-Build

Piping Installation

Grant Writing Assistance

Completed Geosynthetic Liner Projects

Ask About Our Civil Construction Division

Looking for full-service site development? Our Civil Construction Division provides complete design-build solutions—from site grading and excavation to liner installation and finishing work. We simplify complex projects with seamless coordination and expert execution.

IAGI

Certified Welding Technicians You Can Trust

At Geosynthetic Advisors, we take pride in the quality and precision of our work, which is why our field teams include Certified Welding Technicians (CWTs) accredited through the International Association of Geosynthetic Installers (IAGI).

Our technicians are certified to meet IAGI’s rigorous standards for geomembrane welding and seam quality, ensuring every liner installation is completed with expert-level skill and consistency. The CWT program verifies each welder’s competency through hands-on testing and documentation, so you can trust that your project meets the highest levels of durability, performance, and compliance. Our team also works closely with engineering firms to provide quality checks and assurance.

When you partner with Geosynthetic Advisors, you're getting more than experienced crews—you’re getting certified professionals committed to delivering secure, long-lasting containment systems every time.

Why Choose Our Geosynthetic Liner Company?

Geosynthetic Advisors brings decades of experience working on everything from large-scale lining projects like industrial landfills to smaller residential ponds. 

We don’t just supply the product, we provide full-scale installations. Our technicians have an extensive background in containment liner installations, working with homeowners, construction firms, and major industries. Our services support industries like agriculture, oil & gas, energy, landfills, and more.

No need for multiple contractors with our services. From start to finish, our technicians provide on-site project management to oversee your project. As a site grading contractor, we can prepare your project site, including excavation services and liner installation for your containment project.

Our Service Area

Providing professional geosynthetic liner services across the PNW and select states in the Mountain West.

Twin Falls
Boise
Idaho Falls
Pocatello
Coeur d'Alene
Billings
Bozeman
Helena
Kalispell
Missoula
Reno
Elko
Ogden
Salt Lake City
Kennewick
Yakima
Cheyenne
Laramie

We’re Here to Help. Contact Geosynthetic Advisors

Let’s Get Your Project Started.

As a geosynthetic liner company, Geosynthetic Advisors helps with planning large-scale containment systems, provides expert advice, and assists with grant opportunities. We bring decades of industry experience and a full-service approach to every project—no matter the size or scope.

Contact us today to connect with one of our knowledgeable team members.