Andrews Engineering, Inc. provides multidisciplinary engineering services to public- and private-sector clients throughout Illinois, Indiana, and Missouri.

Clear Creek Associates provides practical groundwater science and hydrogeologic solutions for complex water resource challenges.

Daniel B. Stephens & Associates provides geologic, engineering, water resource, and environmental consulting services throughout the Southwest and beyond.

Geo-Logic Associates provides science-based solutions for environmental, engineering, water resource, mining, and natural resource challenges across North America.

Geo-Logic Perú provides geology, geotechnical, hydrogeology, civil engineering, and environmental consulting services throughout Perú and South America.

John Shomaker & Associates, Inc. provides expert hydrogeology services throughout the Southwest.

Kunkel Engineering Group provides engineering, surveying, funding assistance, and construction management services exclusively to municipal clients.

Loughlin Water Associates provides comprehensive water resource and geoscience consulting services for public- and private-sector clients.

RGH provides geotechnical engineering, engineering geology, construction observation, soils and materials testing, and special inspection services in Northern California.

Summit Water Resources provides groundwater supply and water resource management consulting throughout the Pacific Northwest.

The MINES Group provides permitting, engineering, compliance, and operational support services for mining projects worldwide.