William D. Hayes

T 513.651.6827
F 513.651.6981
301 East Fourth Street
Great American Tower, Suite 3300
Cincinnati, Ohio 45202

Bill is a member in the environmental practice group, with a practice focused on air quality issues.  Since 1991, he has provided his expertise to a wide-range of manufacturing clients regarding plant expansions, processing changes, transactions and enforcement defense in matters brought by local, state and federal environmental agencies.  Bill also advises clients on issues related to climate change developments.  He has extensive experience with all aspects of the Clean Air Act, including major and minor New Source Review, New Source Performance Standards, Maximum Achievable Control Technology requirements, and Title V Operating permits.  Bill has unique experience and insight with regards to compliance counseling in all media to the automobile manufacturing and parts industries.  


Prior to private practice, served as managing attorney for air and water programs at the Ohio Environmental Protection Agency

Serving as outside environmental counsel for several major corporations, including automotive manufacturing companies, a Tier 1 automotive parts manufacturer, and several foundries.

The enforcement defense of a stone and aggregate company, resulting in the revision of the Federal New Source Performance Standards Rule regulating underground non-metallic mineral processing.

Highlights & Recognitions

  • The Best Lawyers in America®, Environmental Law, 2001-2019, Litigation - Environmental, 2014 - 2019
  • The Best Lawyers in America®, Cincinnati Lawyer of the Year 2016 - Litigation - Environmental
  • The Best Lawyers in America® Cincinnati Environmental Lawyer of the Year, 2012, 2017
  • Selected for inclusion in Ohio Super Lawyers®, Environmental
  • Chambers USA, Environment, 2004-08; Natural Resources and Environment, 2007-2018
  • Leading Lawyer in Environmental Law, Cincy Magazine, 2007-18
  • Adjunct Professor, University of Cincinnati College of Law

Memberships & Affiliations

  • Vermont Center for Eco Studies, Board
  • Cincinnati Bar Association, Environmental Committee, Chair 2005-07
  • Ohio State Bar Association, Environmental Committee
  • American Bar Association, Section on Environment, Energy and Resources,  Air Quality Committee
  • University of Cincinnati College of Law, Adjunct Professor
  • Air and Waste Management Association
  • Ohio EPA Permit Processing Efficiency Committee, Exemption Threshold Committee, Co-Chair 2004-06
  • Ohio EPA Permit Advisory Group (PAG)
  • Ohio EPA PAG Technical Subcommittee
  • Hamilton County Air Quality Policy Advisory Group
  • Ohio Clean Air Act Small Business Compliance Advisory Panel, Chair, appointed by Governor Taft (2004) and Governor Strickland (2008)
  • The Ohio River Foundation, Board

Civic & Charitable Organizations

  • Youth lacrosse and ice hockey coach
  • Denison University Alumni Hockey Association
  • Terrace Park Environmental Group, Co-chair
  • Cincinnati Nature Center
  • Terrace Park Volunteer Emergency Services Firefighter
  • Leukemia Lymphoma Society Fundraiser

Non-FBT Publications and Events

William speaks frequently in Ohio and nationally on air quality issues that involving the Clean Air Act, including Prevention of Significant Deterioration (PSD), Title V operating permits, maximum achievable control technology and enforcement. He is also a contributing author for publications such as Metal Finishing Magazine and the Cincinnati Business Courier.


“Supreme Court Rejects Climate Change Suit,” Products Finishing Magazine, August 2011

“What the Frack? Separating Fact From Fiction in the Hydraulic Fracturing Debate,” CBA Report, Cincinnati Bar Association, July 2011

“Impacts of the Safe Chemicals Act: Upcoming Changes to TSCA Can Have Significant Impact on Chemical Suppliers and Their Customers,” Process Cleaning Magazine, January/February 2011

"TSCA Overhaul Reform Could Hinder Chemical Development," Products Finishing Online, 2010

"Toxic Substances Control Act Soon to Make First Team of Environmental Regulation," Quarterly Report, Ohio Association of Civil Trial Attorneys, Fall 2010

 "Proposed Toxic Substances Control Act Reforms: 'The Crazy Aunt the Family Didn’t Talk About and Tried To Forget,’" Manufacturing and Technology eJournal, September 17, 2010

"New Emission Credit System Gives Lift to Industrial Development," Leadership Briefing, Ohio Manufacturer’s Association, February 13, 2009

"Paint Rule Primer: New emissions rule gives existing auto-body shops breathing room," Environmental Protection, March 10, 2008

“Backward Looking Forward, PSD Lookback Case Studies,” Air and Waste Management Association, 2006

“Case-by-Case MACT Determinations Under Clean Air Act Section 112(g),” Air and Waste Management Association, 2005

“Finding the Escape Hatch, Use of the Synthetic Minor Provisions to Avoid Title V Applicability,” Air and Waste Management Association, 2004

Other Contact Info




Melissa Bryant
T 513.651.6108