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William Caile

Of Counsel

555 17th Street, Suite 3200, Denver, CO 80202

Bill Caile assists clients with all phases of water supply planning, acquisition, and protection. 

He frequently works with large industrial water users, including mining and oil and gas companies, as well as agricultural producers and ranchers, ski areas and resorts, and private landowners. He helps clients understand their options, and strategically accomplish their goals. Bill has experience with many matters that collaterally involve water, including real estate transactions, land use approvals, corporate acquisitions, and environmental compliance. He has represented clients in all seven of Colorado’s specialized Water Court divisions, as well as in adjudicatory and administrative hearings before the State Engineer, the Ground Water Commission, local government authorities, and ditch company boards.

Bill began his legal career as the law clerk for the Water Judge in Colorado's Division 1 Water Court, where he assisted with several high profile trials involving complex water rights issues.


  • Development and implementation of water supply plans, including surface and groundwater supplies
  • Adjudication of new water rights, changes of water rights, and plans for augmentation
  • Water rights transactions and related real estate matters
  • Administrative proceedings before State agencies, local government authorities, and ditch company boards

Client Results

Water Supply Development
  • Bill represented a large cattle feeder in connection with development and implementation of a water supply plan in the lower Arkansas River basin, which included a precedent-setting transfer of ditch company shares to non-irrigation uses.

Water Court Adjudications
  • Bill has represented industrial water users, both as applicants and objectors, in water court applications for approval of complex augmentation and exchange plans involving hundreds of wells and multiple replacement sources. He has also assisted clients with adjudication of water storage rights involving thousands of acre feet of reservoir capacity.

Administrative Law
  • Bill served as lead counsel for oil and gas producers in rulemaking hearings before the State Engineer which resulted in successful determinations of geographic areas and geologic formations where produced water is considered nontributary groundwater under applicable State water laws. He also served as lead counsel for a large electric utility in an adjudicatory hearing before the Colorado Ground Water Commission regarding the proposed creation of a designated groundwater basin.


Speaking Engagements


Bar Admissions

Court Admissions


  • The Best Lawyers in America©, Natural Resources Law, 2021, 2022

Professional and Civic Affiliations

  • Colorado Bar Association, Water Law Section, Chair, 2009-2011, Executive Council, 2011-2017
  • American Bar Association, Section of Environment, Energy, and Resources, Member
  • Boulder County Bar Association, Member
  • Advisory Board of University of Denver Water Law Review, Member
  • Education Oversight Subcommittee of the Colorado Supreme Court, Standing Water Court Committee, Member

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