Electrical Resistivity Imaging (ERI) is a non-invasive geophysical method used to evaluate changes in subsurface conditions. By measuring variations in electrical properties, geologists can gain insight into groundwater, bedrock, fractures, weathered zones, and other underground features. Learn how ERI works, what it can reveal, and when it may be useful for a site investigation.

Choosing where to drill a water well involves more than picking a convenient location. Learn how geologists use site geology, LiDAR, aerial imagery, and geophysical surveys to identify promising areas for groundwater before drilling begins.

Learn how HydroGeo Environmental uses advanced geophysical imaging to locate contamination, guide Phase II ESAs, and support faster, more effective environmental cleanup projects.

Legacy dams across the U.S. are aging, under-documented, and often structurally compromised. As more communities and agencies move toward decommissioning these outdated structures, the need for reliable, non-invasive tools has never been greater. At HydroGeo Environmental, we use Ground-Penetrating Radar (GPR) and other geophysical technologies to uncover what lies beneath—bringing critical subsurface data to engineers, planners, and restoration teams.

At HydroGeo Environmental, we believe that great wine begins with the soil. For vineyard owners and managers, understanding what lies beneath the surface can be the difference between a good harvest and a great one.

That’s where Electromagnetic (EM) Mapping comes in. This fast, non-invasive geophysical method gives vineyard teams the data they need to make informed, site-specific decisions - whether developing a new site or refining an existing one.

Don’t Drill a Dry Hole: How We Locate High-Yield Wells in Fractured Rock

Why Choose HydroGeo Environmental for Your ESA Needs?