916-993-3962 ext. 108


Santa Clara University, JD

U.C. Davis, AB

Jonathan R. Marz


JONATHAN R. MARZ counsels and represents public agency and private clients in matters involving water rights and related environmental issues. He provides legal and regulatory guidance regarding California’s water rights laws, the Sustainable Groundwater Management Act, the Endangered Species Act, the Clean Water Act, and the National Environmental Policy Act, among other laws and regulations. He has also handled complex business disputes including contract breaches, thefts of trade secrets, and unlawful competition.

Jonathan possesses significant litigation experience, having litigated countless cases from start to finish and achieving favorable outcomes for his clients in court, arbitrations, and mediations. He is adept in all stages and aspects of litigation, including formulating litigation and trial strategy; preparing, filing, and responding to lawsuits; discovery, including taking and defending depositions, and managing large-scale electronic discovery; motion practice; negotiating with opposing counsel and sophisticated entities; working with experts; and bench and jury trial experience.

As an attorney who worked in both private practice and in-house, Jonathan is regarded for his ability to understand legal issues (“What does the law say?”) just as well as the business concerns (“What should we do?”). Jonathan’s clients appreciate his analytical and creative thinking; exercise of good judgment; relationship building skills; and ability to engage in useful problem solving with key decision makers, all while managing critical timelines.


Jonathan is active in civic and charitable organizations, including the Rotary Club of Sacramento, for which he was an elected Director from July 2018-July 2020, and GRID Alternatives North Valley, for which he has been an elected Director since 2016, and elected Board President since 2018.

Jonathan earned his A.B. in Political Science and History (double major) from University of California, Davis, and his J.D. from Santa Clara University School of Law.


  • Represent groundwater sustainability agencies (GSAs) in defense of third-party challenges to adopted groundwater sustainability plans (GSPs)

  • Represented agricultural water suppliers in high-profile cases challenging biological opinions issued by federal agencies concerning endangered aquatic species

  • Represented agricultural water suppliers in lawsuit against federal agency challenging its management of water supplies in contravention of the Central Valley Improvement Act (“CVPIA”) and the 1985 Agreement Between the United States of America and the Department of Water Resources of the State of California for Coordinated Operation of the Central Valley Project and the State Water Project (aka “Coordinated Operations Agreement” or “COA”)

  • Represented agricultural water suppliers before Central Valley Regional Water Quality Control Board in matters regarding issuances of National Pollutant Discharge Elimination System permits under the federal Clean Water Act

  • Represented developer in $46 million claim against a property seller regarding the sufficiency of wetlands permit delivered with the property, as well as the required mitigation for wetlands and endangered species

  • Obtained a $1.5m trial court judgment and permanent injunction against a global financial services firm and two of its employees for theft of trade secrets from, and unfair competition