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Peter D. Mohr

Practice Areas
  • Environmental &Natural Resources Law
  • Environmental & Natural Resources Litigation
  • Water Rights Law
  • Wetlands & Drainage Law
  • Water Quality Law
  • Land Use Law
  • Municipal & Local Government
  • Energy Law (Hydropower)


As an environmental and natural resources lawyer, Peter is committed to helping clients secure both certainty and fairness within the regulatory context.  His practice places a strong emphasis on western water law and he represents clients in a variety of matters, including the clean water act.  He has represented clients within many different jurisdictions during his career as a water lawyer.  Peter also does work in energy law, which primarily intersects with his water law practice and focuses on hydro power.

Representative clients include:

  • Capra Company LLC (vineyard) –water rights acquisition, permitting, mitigation
  • City of Umatilla (Amazon datacenter) – discharge water and water supply
  • Clark Canyon Hydro LLC (hydropower) – water rights, water quality (CWA), fish habitat (ESA), local land use
  • H.L. Wagner & Sons, Inc (Agribusiness) – water rights and water quality, removal-fill, fish habitat
  • ICP US Hydro (hydropower development) – water quantity and quality, fish habitat (ESA), and related local land use concerns 
  • Oregon Association of Nurseries (agriculture) – Willamette River Basin, U.S.A.C.E. Federal Reservoir 
  • Pacific Coast Shellfish Growers Association (shellfish) – natural resource development, state lands, fish habitat, food safety
  • Port of Astoria (marine) – environmental quality compliance
  • RRV Irrigation District (agriculture) – water rights enforcement action, Four-Mile Reservoir, Klamath River Basin

Water Law

As a water law attorney, Peter has worked in Water Rights (state law), Water Quality (state/federal), and Water Resources Development (state/federal). He has dealt with many different jurisdictions throughout the western United States. He provides a high level of expertise in state and federal law to both public and private clients and applies his breadth of experience to effectively counsel his clients in any number of water law issues. His experience includes advising clients on:
  • Water quantity, water quality (Clean Water Act), habitat restrictions (Endangered Species Act) and other water-related state and federal regulatory issues
  • State and federal permit issuance and compliance matters
  • Purchase, utilization, lease, and sale of water and water rights
  • Creation, approval, and implementation of water resource development mitigation plans
  • Maintenance and protection of water rights
  • Development and execution of water rights portfolio investment and management strategies 

Environmental Compliance

Parallel to his water law practice, Peter also works on wetlands and drainage matters, frequently addressing state and federal water quality under the Clean Water Act (CWA) and related fish and wildlife mitigation requirements, permitting, and compliance under the Endangered Species Act (ESA).

Natural Resources

Peter assists his clients with natural resource issues including natural resource acquisition, development, lease, management, and sale, and related state and federal permitting and compliance.

Energy Law

Peter's work in energy law intersects with his water law practice and focuses on hydropower, which encompasses all state and federal law considerations involving water quantity and quality (CWA), fish and wildlife habitat considerations (ESA), and related land use considerations.  He also has experience with wind development and wind power, addressing issues related to access, leasing, and affected habitat restrictions.

Education & Admissions

  • J.D., Vermont Law School, 1997
  • B.A., Connecticut College, 1988
  • State of Colorado
  • State of Oregon
  • State of Washington
  • US District Court, District of Oregon


Memberships & Activities

  • American Bar Association — Environmental, Energy & Natural Resources Section
  • Oregon State Parks Foundation, Trustee, Board Chairman
  • METRO Oversight Committee, Chair
  • Oregon State Bar, Environmental and Natural Resources Section
  • Oregon State Bar, Administrative Law Section
  • Oregon Water Resource Congress

Awards and Honors

  • The Best Lawyers in America®, Water Law, 2013-2020
  • Chambers USA: America's Leading Lawyers, Environment, 2010-2013 


  • “Oregon Supreme Court to Decide Municipal Water Rights Case” Daily Journal of Commerce, July 2014
  • “Overly Cautious or Correct? The Washington Supreme Court’s Swinomish Decision,” Building Insight Magazine, BIAW, April 2014
  • "Consensus Needed to Facilitate Renewable Energy Development on Federal Lands," Daily Journal of Commerce, December 2011; Idaho Business Review (December 2011); Boise Idaho News, December 2011
  • "Your Future Water Supply: When Planning for a Rainy Day is a Bad Idea," League of Oregon Cities Magazine, November 2011
  • "Metro Area Existing and Future Water Supply and Management Considerations," Daily Journal of Commerce, three-part series, Fall 2011
  • "Geothermal Energy Offers Risks and Rewards," Daily Journal of Commerce, March 2011
  • "The Future of Western Water Law:  Will Prior Appropriation Survive Changing Priorities in Western Water Use?", Rural Connections Newsletter, Western Rural Development Center, Utah State University, May 2010



  • “Understanding Riparian and Water Rights,” Boundaries and Easements Halfmoon Seminar, April 2019
  • “Managing Water Assets,” 2019 Northwest Agriculture Show, January 2019
  • "Water Law for Land Use and Real Estate Lawyers," The Seminar Group's 20th Annual Oregon Land Use Law Conference, December 2016
  • "Water Law in Relation to Land Use," Oregon State Bar - Government Law Section, February 2016
  • "How Water Rights Work," Washington State Grape Society, November 2015
  • "Pursuing Certainty in Oregon Municipal Water Supply," Oregon City Attorney Association, September 2015
  • “Fundamentals of Municipal Water” series, Washington Regional Finance Officers Association, Tacoma and Walla Walla, Washington, April 2014
  • "Municipal Water Supply Development and Finance" series, League of Oregon Cities Redmond, Oregon, April 2014
  • “The 8th Annual Future of Water Supply and Management in the Pacific Northwest,” The Seminar Group, Portland, Oregon, Conference Co-Chair and Moderator, April 2013
  • “Fundamentals of Municipal Water” series, Washington Regional Finance Officers Association, Spokane, Washington, May 2013 and Woodinville, Washington, Summer, 2013
  • "Municipal Water Supply Development and Finance" series, League of Oregon Cities Pendleton, Oregon, February 2013 and John Day, Oregon, May 2013
  • "Public/Private Partnerships," Lorman Education Services, Portland, Oregon, October 2012
  • "Fundamentals of Municipal Water" series, League of Oregon Cities, Baker City, Oregon, March 2012, Medford, Oregon, March 2012,  John Day, Oregon, March 2012, Salem, Oregon, January 2012, Astoria, Oregon, January 2012
  • "The 7th Annual Future of Water Supply and Management in the Pacific Northwest: Investment Challenges and Opportunities," Portland, Oregon, Conference Co-Chair, Moderator & Panelist, March 2012.
  • "Water Solutions: Innovations in Water Management," Northwest Environmental Business Council, Vancouver, Washington, June 2011
  • "The Future of Oregon's Water Supply & Management," The Seminar Group, Portland, Oregon, February 2011
  • “The 21st Century Water Right: Will it be enough to ‘use it’ or is some of it already lost?” Western Center for Risk Management 2010 Annual Conference, Palm Desert, California, January 2010

Practice Overview

Practice Areas

Matter Examples

Case Studies