Willis Hon focuses on serving water industry clients across California on a broad range of administrative and regulatory matters. He has extensive experience before the California Public Utilities Commission where he has participated in a number of ratesetting, adjudicatory, and rulemaking proceedings on behalf of water utility companies, industry associations, and regional transportation agencies. He also provides legal counseling and governance advice to public agencies on regulatory compliance issues, including matters relating to the Brown Act and public procurement laws.

Willis has written and presented on climate change resilience and adaptation matters, with a particular expertise on recent legislation addressing wildfire risks and the doctrine of inverse condemnation. He also has experience representing clients in federal court and before administrative agencies on environmental law matters involving the Clean Water Act and local air quality regulations.

Prior to joining Nossaman, Willis was an associate at a boutique environmental law firm in New York City, where he worked on federal and state environmental litigation and advised clients in regulatory investigations. He also served as a law clerk with the U.S. Department of Justice, Environment and Natural Resources Division, Law and Policy Section.



California Water Association.  Represents the statewide association of investor-owned water utilities regulated by the CPUC and the SWRCB in proceedings relevant to records confidentiality and other policy matters impacting the delivery of safe, reliable water service at reasonable rates.  Represents member companies in adjudicatory and ratesetting matters, including general rate cases and cost of capital proceedings.

San Diego Association of Governments (SANDAG).  Represented SANDAG in rail crossing authorization proceedings before the CPUC in connection with SANDAG’s Mid-Coast Trolley Extension project to bring Blue Line Trolley service from Santa Fe Depot in Downtown San Diego to the University City community.

San Francisco County Transportation Authority.  Member of team that serves as General Counsel to the Authority, which administers and oversees the delivery of the local transportation sales tax program to fund major transportation infrastructure projects.

Manufacturing Company.  Member of team that represented client in an Order of Abatement hearing before the South Coast Air Quality Management District regarding air emissions and in a Clean Water Act citizen suit relating to allegations of stormwater pollution.



Blog Posts

Speaking Engagements


Community & Professional

Asian American Bar Association

California Minority Counsel Program

Water Education Foundation, Water Leaders Program, 2020

Conference of California Public Utility Counsel, Young Utilities Lawyers section, Co-Chair

Bar Association of San Francisco


Honors & Recognitions

Included in Best Lawyers: Ones to Watch for Administrative/Regulatory Law, 2021-2022



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