S. Chapin Lewis

Associate, Balcomb & Green, P.C.


Chapin joined the firm in June of 2021 as a water law associate.  He began his water law practice at another boutique water firm in the Roaring Fork Valley prior to serving as a Judge Advocate in the Marine Corps where he held litigation focused duty assignments.  After active duty, Chapin received a Master of Laws in Natural Resources, Energy, and Environmental Law from the University of Colorado in May of 2021.

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Chapin earned his J.D. at the Sandra Day O’Connor College of Law, where he studied water law and was the V.P. of the Environmental Law Society.  He externed at the Scottsdale City Attorney’s Office, Sen. John McCain’s Washington, D.C. office, and spent both summers at the Aspen office of a super-regional law firm.  He also took his B.A. from ASU, while starting his career as a Staff Assistant to Sen. McCain.

Growing up on the Fryingpan River near Basalt, Colorado and coming from a ranching family with holdings in another prior appropriation state gave Chapin a deeper appreciation for western water law.

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Education & Admissions
  • Arizona State University (2007 BA)
  • Sandra Day O’Connor College of Law (2013 JD)
  • University of Colorado Law School (2021 LLM Natural Resources, Energy, and Environmental Law)
  • State of Colorado Bar (2013)
Honors & Activities


  • “The Big Horn General Stream Adjudication Concludes After 37 Years” 19 W. Water L. & Policy Rptr. 63 (2015).
  • “The Rapanos Decision Revisited – EPA and the Corps of Engineers’ Proposed Rule Will Attempt to Clarify ‘Waters of the United States’” 18 W. Water L. & Policy Rptr. 191 (2014).
  • “Colorado Supreme Court Finds State Engineer Properly Exercised Authority to Administer Nontributary Groundwater on an Indian Reservation” 18 W. Water L. & Policy Rptr. 155 (2014).