West Yost Welcomes Wildermuth Environmental, Inc. To our Team
Expanding and enhancing our expertise and resources

West Yost Associates is excited to announce the addition of Wildermuth Environmental, Inc. (WEI), a highly regarded groundwater resources firm located in the Irvine, CA, area to the West Yost team.

For 30 years, West Yost’s mission has and continues to be the water firm of choice for both our clients and team. Expanding our groundwater resources expertise helps us to realize our mission and purpose and adds a great group of valued professionals to our team.

The addition of the WEI team members has led to the formation of West Yost’s new Groundwater Business Sector. WEI’s reputation is built on groundwater management, modeling, monitoring and Watermaster services. ​As pioneers of salt nutrient management planning, their approach has been adopted throughout California. ​

West Yost, a leading water firm located throughout the Western United States, provides the same level of client service as WEI and brings value with additional practice areas, thought leaders and an enhanced bench of talent. Now as members of the West Yost team, our new colleagues are able to expand on the professional career development opportunities available at West Yost. 

“The team members at WEI are recognized groundwater experts in California. Together, we look forward to providing the outstanding level of service and technical prowess from which West Yost has built its reputation,” says Charles Duncan, PE, President and CEO of West Yost Associates 

The new Groundwater Business Sector combines the resources and strength brought by both WEI and West Yost’s groundwater expertise and will be led by Ms. Samantha Adams. The business sector will focus on groundwater management, planning and modeling, monitoring, well siting and design, salt nutrient management planning and Watermaster services throughout the west. Click here to learn more about Ms. Adams and the other members of the Groundwater business sector.

The founder of WEI, Mr. Mark Wildermuth, is an expert in surface and groundwater hydrology, groundwater management, water rights and much more. With 42 years’ experience, Mr. Wildermuth is a recognized expert in the hydrology of the Santa Ana Watershed, having developed groundwater models currently used to manage the Chino, Cucamonga, Six Basins, Temescal, and Mammoth Basins. Mark will continue to remain involved in projects and will be a tremendous resource and mentor to West Yost.

“We are excited to have completed the merging of WEI with the high-performance West Yost team for which we share common vision and values. We look forward to the expanded opportunities for our clients and staff,” says Mark Wildermuth, PE

In support of the blending of our two firms, we are excited to have West Yost’s complete Irvine office team in one location at:
23692 Birtcher Drive, Lake Forest, CA 92630.

We look forward to an open house, hopefully in 2021, when it is safe to do so and where we can introduce you to our whole team. 

To learn more about West Yost, please visit our website at


Mark Wildermuth, PE, Principal, West Yost

Samantha Adams, Groundwater Sector Lead

Charles Duncan, PE, President and CEO, West Yost

Media Contact: Nikki McQuaid, 530.761.0255,