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Standing photo of Environmental attorney David Van Slyke

David B. Van Slyke,
Senior Counsel; Chair, Environmental Practice Group
dvanslyke@preti.com

Portland, ME 207.791.3000
Direct207.791.3221
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  • Biography
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Services

  • CERCLA Allocation & Mediation
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  • Climate Strategy
  • Environmental
  • Environmental Litigation
  • Land Use & Permitting
  • Municipal Law and Finance
  • Natural Resource Damages
  • Offshore & Onshore Wind Power
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  • Stormwater

Admissions

  • Maine
  • U.S. District Court, District of Maine
  • U.S. Court of Appeals, First Circuit

Education

  • St. Lawrence University (B.S.)
  • Syracuse University College of Law (J.D.)

News

June 10, 2026
10 Preti Flaherty Attorneys and 6 Practice Groups Recognized in Chambers USA 2026 More
May 6, 2026
Preti Flaherty Attorneys Selected for Inclusion in 2026 Super Lawyers More
January 23, 2026
David Van Slyke Named to the 2026 Lawdragon 500 Leading Environmental Lawyers – The Green 500 More
August 21, 2025
Preti Flaherty Attorneys Selected by Peers for Inclusion in Best Lawyers in America 2026, Including 3 “Lawyers of the Year” and 3 “Ones to Watch” More
June 23, 2025
12 Preti Attorneys and 9 Practice Groups Recognized in Chambers USA 2025 More
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Press Coverage

June 19, 2024
Portland law firm Preti Flaherty unveils renovated HQ space
  • Biography
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Firm Highlights

Publication

CWA Section 401 Water Quality Certification: EPA Rethinking It (Again)

On July 7, 2025, the U.S. Environmental Protection Agency (EPA) published a notice inviting public comments on its 2023 Water Quality Certification Improvement Rule . That rule governs Clean Water Act (CWA) Section 401...

News

David Van Slyke Named to the 2026 Lawdragon 500 Leading Environmental Lawyers – The Green 500

Preti Flaherty is pleased to announce that David Van Slyke has been recognized in the 2026 Lawdragon 500 Leading Environmental Lawyers – The Green 500. This distinction reflects David’s continued leadership and influence in...

News

10 Preti Flaherty Attorneys and 6 Practice Groups Recognized in Chambers USA 2026

Preti Flaherty is proud to announce that ten of our attorneys and six practice areas have been recognized in the 2026 edition of Chambers USA, reflecting the firm’s depth of talent across New England...

News

Preti Flaherty Attorneys Selected for Inclusion in 2026 Super Lawyers

Fifteen Preti Flaherty attorneys have been selected for recognition by Super Lawyers , including 8 Rising Stars. Super Lawyers recognizes outstanding attorneys across firms of all sizes and more than 70 practice areas nationwide...

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