The purpose of CGWA is to advance the understanding of groundwater hydrology among its membership and the residents of Colorado. CGWA organizes monthly speaker presentations, field trips, community volunteer opportunities, social/networking events and publishes a quarterly newsletter. We are committed to facilitating the wise use of the State's groundwater resources by providing a forum to examine the scientific, technical and policy-making issues related to groundwater. 

From its inception in 1981, CGWA has been a positive and proactive organization. Because of the voluntary efforts of its members, the Association has played an active role in shaping the use and protection of groundwater in Colorado. CGWA leverages the diverse areas of expertise of its members and expands the scope of the profession of groundwater hydrology often cooperating with other related organizations to sponsor conferences.

Ashley Lennon is a Hydrogeologist with the Colorado Division of Water Resources. Her responsibilities include groundwater level monitoring and primary hydrogeologist reviewing data DWR connects to the National Groundwater Monitoring Network as well as evaluating well permit variance and log waiver requests. She has Geology and Business Management degrees from Colorado State University. She lived in Vail for 10 years where she worked with the Eagle River Watershed Council in community outreach and riparian remediation projects. Ashley has served as Secretary, two-time Director for CGWA, and VP as well as Symposium Committee member. Ashley enjoys spending time with her family in the mountains skiing, hiking and fishing. She is ready to help build CGWA's membership and mission and get back to connecting the Colorado groundwater community!

Ms. Holly Miller is Senior Engineer at Broadbent and Associates, Inc. with over 10 years of experience working on environmental projects throughout the west. She works on a broad range of projects with state and local agencies to provide creative and innovative solutions to water quality issues. She brings knowledge of regulatory processes, analytical methods, data review, analysis, and validation. Ms. Miller has a B.S. degree in Chemical Engineering and a M.S. degree in Environmental Engineering both from the University of Colorado at Boulder. She has been an active member with the CGWA since 2017 when she was the recipient of the Harlan Erker Memorial Scholarship. She currently lives in Nederland, CO with her husband and border collie whom she enjoys skiing, biking, hiking, and rafting with.

Wenli Dickinson is a water resource engineer with the Division of Water Resources. She studied environmental engineering and hydrology and graduated from the Colorado School of Mines in 2019. She grew up in Colorado and enjoys hiking and rock climbing.

Andie Gehlhausen is a Senior Hydrogeologist and Project Manager at Golder Associates in Lakewood, CO. Andie graduated with a M.S. in Hydrogeology from the University of Nevada, Reno and has over 14 years of technical experience working on projects across the western US and internationally. She currently lives in Evergreen with her husband, two young kids and two Australian Shepherd puppies. Andie has been active with CGWA since 2017 and looks forward to the opportunity to serve the board in 2020.

Reid is a Senior Hydrogeologist at INTERA in Boulder, CO. He graduated with an MSc. in Hydrogeology from the University of Strathclyde (Glasgow, Scotland) in 2013 and has 14 years of experience as a geologist across the US and abroad. He has worked on rural water supply projects in Malawi, Africa and is a FGASA certified safari guide. Reid loves hiking and travel and currently lives in Northglenn with his wife, Candice, daughter Rosaleigh, and their two dogs, Huckleberry and Stella.

Justin is a professional engineer with 21 years of multi-disciplined environmental and water resource consulting experience in both technical and managerial roles. He grew up in the northeast, where water is plentiful, and has been around and drawn to water his entire life. Justin’s professional experience is broad and has provided him the opportunity to work on a variety of projects in the consulting industry as both a technical expert and project manager, spanning multiple disciplines from contaminate hydrogeology, groundwater supply development, mine water management, and Colorado water rights and water resource engineering. His expertise has provided him the opportunity to work for both small and multi-national consulting groups, working on technically challenging projects, with a diversity of clients and industries. His work has taken him to some interesting places, but he has managed to establish roots in Colorado. Justin holds a Bachelor of Science in Environmental Science (1998) from the State University of New York at Plattsburgh, and a Master of Science in Environmental Engineering (2005) from the University of Colorado-Denver. He is a registered professional engineer in Colorado and North Dakota, and a NCEES record holder. In his free-time you will find him enjoying the outdoors with his wife and two kids mountain biking or searching for fresh powder throughout Colorado.

Chelsea currently has 8 years of groundwater experience coming from a contractor’s perspective. She relocated to the Denver Metro area in 2022 working as a Project Manager and Business Development of a uniquely qualified company and is positioned to provide a comprehensive range of groundwater construction services to meet the specific needs and requirements of clients. As a highly motivated individual, she jumped right in to attending meetings with CGWA and joined a few committees including planning the annual Symposium. When not devising new ways to accomplish your groundwater needs she enjoys CrossFit, hiking & backpacking in the mountains and playing competitive roller derby.

Legislative Committee: The role of the Legislative Committee of the Colorado Groundwater Association is to educate the board of directors and members on groundwater matters being considered by administrative agencies, policy makers, and members of the Colorado General Assembly and to make recommendations for advocacy if those matters impact the maximum beneficial use of groundwater in the state for the benefit of the citizens of Colorado.  Committee Members: Nick Martin.

Scholarship Committee: This committee is in charge of soliciting applicants for CGWA's scholarship grants. The committee advertises the scholarships to Colorado-based university students, prepares the applications for review by the Board of Directors, and works with the scholarship recipients to ensure they meet the requirements to receive the entire grant. Committee Members: Betsy Semmens & Sarah Hodson.

Technical Working Group: The Technical Working Group is a forum for discussion of topics relevant to water well contractors, groundwater professionals, and State of Colorado administrative agencies. CGWA Board Members who attend the Technical Working Group Meetings share updates from the meetings to the Board of Directors and the CGWA membership. Committee Members: Andy Flor.

Symposium Committee: The CGWA works with the Colorado Section of the American Water Works Association to host an annual symposium. The Symposium Committee works with AWRA to plan and execute the annual symposium, as well as to keep the Board of Directors updated on the progress. Committee Members: Wenli Dickinson, Holly Miller, Betsy Semmens, Chelsea Borneman, Javier Vargas-Johnson, Mary White, & Ashley Lennon.

Communications Committee: This committee assists the Secretary and Directors in improving the monthly communication emails to membership. The committee is also in charge of the quarterly newsletter (currently on hold). Committee Members: Chelsea Borneman, Holly Miller, & Wenli Dickinson.

Education & Outreach Committee: This committee is in charge of coordinating educational and outreach opportunities. This committee will respond to requests for educational presentations or activities from the public as well as support educational or outreach events CGWA has previously been involved in such as Scout Days. Committee Members: Helen Malenda-Lawrence, Holly Miller, Sarah Hodson, & Wenli Dickinson.