About Me

Betsy Semmens

Principal of BAS Groundwater Consulting Inc.

Senior Groundwater Modeler


Betsy Semmens is a Hydrogeologist and Principal of BAS Groundwater Consulting INC (BAS), specializing in numerical modeling for groundwater problems. Ms. Semmens has over 25 years of practical experience as a consulting hydrogeologist. Her primary roles have included data analysis and management, and numerical modeling at mine sites, manufacturing sites, and Superfund sites, as well in support of municipal, utilities, and land development projects and litigation support.  Ms. Semmens is an active member of the Colorado Groundwater Association and the Arizona Hydrologic Society, and she is a Registered Geologist in Arizona, Idaho, Utah, and Wyoming.

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