ABWC Executive Council Officers

President Tom Davis



Tom W. Davis joined the Yuma County Water Users' Association as manager in January 2007. Prior to joining YCWUA, Tom was manager of the Carlsbad Irrigation District, Carlsbad , NM . He was also employed for fifteen years by the USDA-Forest Service. Tom is a graduate of Oklahoma State University .

Member of:

· National Water Resources Association

· Family Farm Alliance

Vice-President Donovan Neese


Donovan Neese is currently the superintendent of the Roosevelt Irrigation District. He was appointed to this position in 2011. He is a registered professional engineer and worked as a design and construction engineer in agriculture for ten years prior to coming to the District. Donovan also has a Masters of Business Administration.

He is a member of:

  • American Society of Civil Engineers (since 1997)
  • Agribusiness & Water Council of Arizona (since 2011)
  • Westside Area Managers (since 2011)
  • Irrigation and Electrical Districts Association (since 2011)
  • Member of the Colorado River Energy Distributors Association
  • Member of the United State Committee on Irrigation and Drainage

Secretary Cheryl Zittle


 Cheryl has been with SRP since 1982. She is currently the Senior Director of Water Services. She oversees the water contact center, water accounting, contract administration, water delivery operations, scheduling, field customer service, water engineering and groundwater along with construction and maintenance. Prior to her current role, Cheryl has spent the past 21 years in various positions within water, supporting operations and budgeting. Prior to her experience in water, she spent time working at PERA Club and Computer Applications in System Operations.

 Cheryl earned both her Bachelor of Science degree in Business Administration and Masters of Business Administration from the University of Phoenix.

 Cheryl serves as the President of the National Water Resources Associate, the national affiliate to ABWC.  She also serves on the Board of Directors for Fresh Start Women’s Foundation. 

Treasurer Glen Vortherms


Maricopa Water District

Legislative Chair Wade Noble


Wade and his wife Kathy are the parents of five children. He is a fifth-generation native Arizonan, born in Safford and growing up in Wilcox. After a family move to Tempe, he graduated from Tempe High School. His Bachelor’s Degree is from the University of Arizona (1973) and his Juris Doctor Degree from St. Mary’s University of San Antonio (1977).

Wade has been in private practice in Yuma since 1978. He was a member of the Westover Law Firm until its dissolution in 1996. In that year, he formed the Noble Law Offices.

Clients include: Wellton-Mohawk Irrigation and Drainage District, Yuma Irrigation District, North Gila Valley Irrigation and Drainage District, and Unit B Irrigation and Drainage District.

  • Affiliations:
    *        President National Water Resources Association 2011-2012 (NWRA)
    *        Member NWRA Board of Directors
    *        Chair NWRA Policy Development Committee
    *        Chair Resolutions Committee Colorado River Water Users’ Association
    *        Member Family Farm Alliance Advisory Council
    *        Chair Arizona Navigable Stream Adjudication Commission
    *        Member Governor’s Water Augmentation, Innovation and Conservation Council
                       (GWAICC) formerly Governor’s Water Augmentation Council
    *        Chair GWAICC Long Term Water Augmentation Committee
    *        Member Arizona Delegation Colorado River Seven Basin States Principals
    *        Member Lower Basin Drought Contingency Plan Arizona Steering Committee
    *        Member Lower Colorado Multi-Species Conservation Program Steering Committee
    *        Member Executive Committee Agribusiness & Water Council of Arizona (ABWC)
    *        Chair ABWC Legislative Affairs Committee
    *        Coordinator Yuma County Agriculture Water Coalition
    *        Member Case Study Committee and contributor:
    "A Case Study in Efficiency B Agriculture and Water Use in the Yuma, Arizona Area” Yuma County Agriculture Water Coalition, March 2015

Education Chair N.W. Bill Plummer and Past ABWC President



Bill Plummer provides consulting services to irrigation districts, towns and cities in Arizona and has been involved in numerous water and water related programs in South and Southeast Asia for the World Bank, Asian Development Bank and the United Nations.  He has served in a number of policy and management positions in Washington, DC, Denver, Salt Lake City and Boulder City, Nevada with the Office of Management and Budget and the Department of the Interior. 

From 1978 to 1985 he was responsible for all Bureau of Reclamation activities in both the Upper (1978-1981) and Lower (1981-1985) Colorado River Basins.  He was the Director of the Arizona Department of Water Resources from 1988 to 1991 and General Manager of the Yuma Mesa Irrigation and Drainage District in 2006-2007.  He participates in the following organizations:


  • Agribusiness & Water Council of Arizona-Past President
  • National Water Resources Association-Member, Board of Directors
  • Family Farm Alliance-Member, Advisory Committee
  • Central Arizona Project Association-President
  • United States Committee on Irrigation and Drainage-Member, Long  Range Planning Committee
  • International Boundary and Water Commission-Member, Colorado River   Citizens Forum, former Co-Chair
  • Colorado River Water Users Association-Member
  • Arizona-Mexico Commission-Member
  • Town of Paradise Valley, Arizona-Member, Water Committee

He has BS in Civil Engineering from the University of Vermont and MS in Engineering-Economic Systems from Stanford University.