Donald A. Haagensen

Donald A. Haagensen



Practice Areas


College of Idaho, B.S., 1967 (zoology)

University of Miami, M.S., 1975 (marine biology)

University of Miami School of Law, J.D., 1977, cum laude, Wig and Robe Society, Editor, University of Miami Law Review


Don is rated as an AV Preeminent attorney and Peer Rating 5.0 of 5.0 by Martindale Hubbell.


The College of Idaho selected Don Haagensen as its 2013 Distinguished Alumni.

Don was also elected to membership in Sigma Xi, an honor society for science and engineering.

2013 Best Lawyers' Portland, OR Environmental Law "Lawyer of the Year"

2016 Best Lawyers' Portland OR Natural Resources Law "Lawyer of the Year"

2016 Best Lawyers' Portland, OR Litigation-Environmental "Lawyer of the Year"

Best Lawyers Award Badge

Don's peers have selected him for inclusion in Oregon Super Lawyers

 Click here to read about Don in a Super Lawyers article 

Don has recently been named an America's Top 100 Attorneys Lifetime Achievement Member.

America's Top 100 Attorneys Lifetime Achievement Award

Admitted to Practice

Oregon State Courts

United States District Court, District of Oregon

United States Court of Appeals, Ninth Circuit

United States Supreme Court

Professional Experience

Since 1977, Don Haagensen has focused his practice primarily in the areas of environmental, natural resources, and energy law. He has represented private and public clients in resolving complex environmental legal issues under Oregon and federal law.

Mr. Haagensen has assisted clients with the permitting of large-scale, electric generating projects, including hydroelectric, wind, geothermal, nuclear, coal, and cogeneration projects. In addition, he has represented clients in the investigation and remediation of properties with hazardous substance contamination and assisted clients through negotiation and litigation to recover the costs incurred from the responsible parties.

Previous Experience

Mr. Haagensen was a graduate biologist, published scientific articles and a book, and worked as a scientist for the federal government before entering law school.  Before this firm, Mr. Haagensen was a partner in the environmental and energy group of one of the largest law firms in the Pacific Northwest.

Representative Work

Drafted environmental legislation for clients and associations and assisted them with the passage of legislation in previous sessions of the Oregon Legislative Assembly.

Provides regulatory, legislative, and litigation counsel on matters involving hazardous and solid waste for two national environmental service providers.

Represented numerous clients for investigation and cleanup of contaminated properties including innovative approaches such as sale back of property to prior owner, entering prospective purchaser agreement to protect new owner, and convincing prior owners and operators to agree to fund all except minor share of costs for investigation and cleanup by current owner.

Assisted clients with the relicensing of hydroelectric projects under traditional and alternative licensing procedures, including consultations under the Endangered Species Act of 1973 and federal, state, and local authorization processes.

Assisted client with multi-year investigation, repair and reconstruction of a hydroelectric project damaged by failure of an embankment at the project.

Represented agricultural organizations and farmers for air issues before the Oregon Legislative Assembly, with state and federal agencies, and in court.

Military Service

Lieut., U.S. Coast Guard, 1969-1972

Professional Activities

Member, Oregon Department of Geology and Mineral Industries, Governing Board (1981-1990, 2002-2010), Chair (three terms), Vice Chair (one term)

Chair, Oregon Mined Land Reclamation Advisory Committee (1983-1987)

Member, Oregon Department of Environmental Quality advisory committees:

  • Hazardous Waste (1991, 1992-1993, 2002-2003)
  • Environmental Enforcement (1992-1993, 2003-2004, 2012-2013)
  • Hazardous Waste and Toxics Use Reduction (1994-1995), Chair
  • Pesticide Waste (1995-1996), Chair
  • Orphan Site Funding (1996)
  • Spill Management (1996)
  • Hazardous Waste Program Development (1996-1997)
  • Environmental Cleanup (1995-2002, 2006), Chair 
  • Section 401 Certification Procedures and Fees (2003-2004)
  • Expedited Enforcement (2008)
  • Greenhouse Gas Reporting (2009-2010)

Executive Committee of the Agricultural Law Section of the Oregon State Bar (2001)

Natural Resources Committee of the Oregon State Bar (1981-84)


The following list highlights some of Mr. Haagensen’s published works.

Oregon State Bar, Environmental & Natural Resources Section publication, Outlook, coauthored “Avoiding Double Penalties for Violations of Water Pollution Control Laws”  with Richard Lorenz (2000)

Oregon Insider, “Hazardous Waste Management Facility Pioneers Disposal of ‘CAMU-Eligible’ Waste” (2003)

Oregon State Bar, Environmental and Natural Resources Law, coauthored “Environmental Cleanup Liability” chapter with Margaret Stern (2002, supp. 2006)

H.B. Michel, M. Foyo and D. Haagensen.  "Caribbean Zooplankton, Part I - Siphonophora, Heteropoda, Copepoda, Euphausiacea, Chaetognatha and Salpidae; Part II - Thecosomata."  Office of Naval Research, Department of the Navy.  (1976)

Community Activities

Willamette University Parents Board

Coach, youth sports teams

News and Articles